Service parts for the 125EOZ
Grouped by system, with how many of each the parts manual calls for.
Oil system
1 requiredPrices captured from merchant listings; some links are affiliate links. Confirm against your serial number before ordering.
Specifications
| Fuel | diesel |
|---|---|
| Frequency | 60.0 Hz |
| Standby power | 125 kW |
| Standby kVA | 156 |
| Prime power | 125 kW |
| Emissions | Tier III |
| Controller | 550, Decision-Maker, Decision-Maker 3+, Decision-Maker 3500 |
| Oil capacity | 19.0 L |
| Alternator | Fast-Response X (Class Class H insulation) |
| Voltage options | 120/208 V, 120/240 V, 127/220 V, 139/240 V, 277/480 V |
| Phase | 3 |
| Rated current | 434 A |
| Battery cranking | 925 CCA |
| Battery voltage | 12- or 24-volt V |
| Coolant capacity | 19 L |
| Dimensions (L×W×H) | 2205×971×1065 mm |
| Dry weight | 1683 kg |
| Wet weight | 1515 kg |
Maintenance & consumables
| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Fuel filter | Primary | 223414 | Amazon eBay $13.45 NAPA $34.79 | ||
| Fuel filter | Secondary | 223953 | Amazon eBay $80.00 NAPA $56.25 | ||
| Oil filter | 223673 | Amazon eBay $26.99 NAPA $35.41 KuduParts $14.00 |
Service intervals
28| Item | Action | Hours | Months | Notes |
|---|---|---|---|---|
| Generator end bracket bearing | Replace | 10 hr | Service more frequently if bearing inspection indicates excessive rotor end play or bearing damage from corrosion or heat buildup | |
| Electrical connections | Check | 50 hr | 1 mo | Check and tighten; Monthly or 50 Hrs. |
| Siphon break function, if equipped | Test | 100 hr | 3 mo | 3 Months or 100 Hrs. |
| Air cleaner element | Inspect | 250 hr | 6 mo | Clean or replace as necessary; 6 Months or 250 Hrs. |
| Coolant temperature protection level | Check | 250 hr | 6 mo | 6 Months or 250 Hrs. |
| Engine oil | Change | 250 hr | 6 mo | First service — First 50 Hrs., then every 250 Hrs. or 6 months |
| Exhaust/water mixing elbow | Clean | 250 hr | 6 mo | 6 Months or 250 Hrs. |
| Oil filter(s) | Replace | 250 hr | 6 mo | First service — First 50 Hrs., then every 250 Hrs. or 6 months; more frequent in dusty areas |
| Seawater pump impeller | Check | 250 hr | 6 mo | 6 Months or 250 Hrs. |
| Zinc plugs | Replace | 250 hr | 6 mo | Inspect and replace; 6 Months or 250 Hrs. |
| Battery cables | Clean | 500 hr | 12 mo | Yearly or 500 Hrs. |
| Cooling system | Check | 500 hr | 12 mo | Yearly or 500 Hrs. |
| Crankcase vent filter, if equipped | Replace | 500 hr | 12 mo | Yearly or 500 Hrs. |
| Crankcase ventilation system, if equipped | Clean | 500 hr | 12 mo | Yearly or 500 Hrs. |
| Fuel filter elements | Replace | 500 hr | 12 mo | Yearly or 500 Hrs. |
| Heat exchanger core and aftercooler core, if equipped | Clean | 500 hr | 12 mo | Inspect and clean; Yearly or 500 Hrs. |
| Seawater pump impeller | Replace | 500 hr | 12 mo | Yearly or 500 Hrs. |
| Cooling system | Change | 2000 hr | 24 mo | Flush and refill; 2 years or 2000 Hrs. |
| Cooling system | Test | 2000 hr | 24 mo | Pressure test; 2 years or 2000 Hrs. |
| Seawater pump | Inspect | 2000 hr | 24 mo | Inspect and repair; 2 years or 2000 Hrs. |
| Thermostats | Test | 2000 hr | 24 mo | 2 years or 2000 Hrs. |
| Belt | Check | 1 mo | Monthly; replace as necessary | |
| Circuit breakers, fuses | Test | 1 mo | Monthly | |
| Crankcase breather | Inspect | 3 mo | Quarterly | |
| Fuel piping | Inspect | 12 mo | Yearly | |
| Generator set storage (three months or longer) | Other | 3 mo | Perform the storage procedure before taking a generator set out of service for three months or longer | |
| Return lines for obstructions | Inspect | 12 mo | Yearly | |
| Seawater pump | Other | First service — Prime the seawater pump before initial startup; confirm water discharge from the exhaust outlet |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
Service specifications
60| Type | Item | Value | Unit | Condition |
|---|---|---|---|---|
| Clearance | End bracket to bearing outer race clearance | 6.35 mm (0.25 in.) | mm (in.) | |
| Gap | Magnetic pickup air gap | 0.35--0.71 mm (0.014--0.028 in.) | mm (in.) | 1/4 to 1/2 turn back from ring gear tooth contact |
| Gap | Speed sensor air gap | 0.36--0.71 mm (0.014--0.028 in.) | mm (in.) | |
| Other | Alternator protection rated current vs. time delay | 200%: 40 seconds; 300%: 10 seconds; 425%: 5 seconds; 950%: 1 second | % rated current / seconds | |
| Other | Alternator short-circuit excitation current | Up to 300% at 60 Hz (approximately 275% at 50 Hz) for a minimum of 10 seconds | % rated current / seconds | |
| Other | Angular limits during operation, continuous / intermittent (3 min or less) | 20 / 30 | degrees | 40EOZD(C)J, 33EFOZD(C)J |
| Other | Angular limits during operation, continuous / intermittent (3 min or less) | 25 / 35 | degrees | 125/150EOZD(C)J, 100/125EFOZD(C)J |
| Other | Angular limits during operation, continuous / intermittent (3 min or less) | 35 / 45 | degrees | 50EFOZD(C)J, 55/65EOZD(C)J, 45/55EFOZD(C)J, 80/99EOZD(C)J, 70/80EFOZD(C)J |
| Other | Controller power drain | 400 milliamps at 12V; 200 milliamps at 24V | mA | |
| Other | Cyclic cranking (default) and maximum | 15 seconds cranking, 15 seconds rest, 3 cycles (default); up to 30 s crank, up to 60 s rest, up to 6 cycles | seconds/cycles | |
| Other | Digital inputs inhibit period after startup | 30 | seconds | |
| Other | Load profile minimum / ideal | 30% (minimum); 70% load or more (ideal) | % load | |
| Other | Oil pressure shutdown delay after low pressure detected | 5 | seconds | |
| Pressure | Low oil pressure switch 253323 | 15 ±3 | psi | |
| Pressure | Low oil pressure switch 328309 | 15 ±2 | psi | |
| Pressure | Low seawater pressure switch GM30263 | 0.5 ±0.3 | psi | |
| Pressure | Oil pressure sender 264390 | 240 +17 --15 ohms at 0 psi; 153 +12 --15 ohms at 25 psi; 33.5 ohms at 100 psi | ohms | |
| Pressure | Oil pressure sender GM16788 input pressure range | 0--1034 kPa (0--150 psi) | kPa (psi) | proof pressure 3103 kPa (450 psi); burst pressure 5171 kPa (750 psi) |
| Resistance | Alternator field insulation (megohmmeter, 500 VDC applied to F+ or F-- lead and rotor shaft) | 500 kOhms (1/2 megohm) and higher | kOhms | 500 volts DC applied |
| Resistance | Alternator field resistance (F+/F--) | 1.44 | ohms | |
| Resistance | Alternator field resistance (F+/F--) | 1.6 | ohms | |
| Resistance | Alternator field resistance (F+/F--) | 1.79 | ohms | |
| Resistance | Alternator field resistance (F+/F--) | 1.9 | ohms | |
| Resistance | Alternator field resistance (F+/F--) | 2.21 | ohms | |
| Resistance | Alternator field resistance (F+/F--) | 2.7 | ohms | |
| Resistance | Exciter armature resistance | 0.11 | ohms | |
| Resistance | Exciter armature resistance | 0.34 | ohms | |
| Resistance | Exciter armature resistance | 0.47 | ohms | |
| Resistance | Governor actuator coil resistance, 12 VDC | 2.05 ±0.25 | ohms | ambient temperature |
| Resistance | Governor actuator coil resistance, 24 VDC | 7.20 ±0.50 | ohms | ambient temperature |
| Resistance | Governor actuator coil to case isolation | >3 | megohms | |
| Speed | Full load engine speed | 1800 rpm (60 Hz) or 1500 rpm (50 Hz) | rpm | hot engine under load |
| Speed | Overfrequency setting range, delay and default | 102%- 140% of nominal (range); 10 (delay); 110% of nominal (default) | % of nominal / sec. | |
| Speed | Underfrequency setting range, delay and default | 80%- 95% of nominal (range); 10 short term, 60 long term (delay); 90% of nominal (default) | % of nominal / sec. | |
| Temperature | Controller operating temperature | - 40 to 70 | C | Decision-Maker 3500 controller |
| Temperature | Coolant 50% ethylene glycol freezing / overheating protection | - 37 (- 34 F) freezing; 129 (265 F) overheating | C | 50% ethylene glycol solution |
| Temperature | Coolant temperature sender GM39458, Value A | 123.8 +7.2 --7.8 | ohms at 195°F | |
| Temperature | Coolant temperature sender GM39458, Value B | 35.6 +3.4 --3.6 | ohms at 280°F | |
| Temperature | Exhaust temperature switch 249872 / GM19189, close | 102°C±15°C (215°F±5°F) | °C (°F) | |
| Temperature | Exhaust temperature switch 249872 / GM19189, open | 88°C±15°C (190°F±10°F) | °C (°F) | |
| Temperature | High coolant temperature switch 241481 / GM29288 | 103°C ±4°C (218°F ±7°F) | °C (°F) | normally open, closes on temperature rise |
| Temperature | High intake air temperature shutdown delay | 5 | seconds | after intake air reaches shutdown range |
| Torque | Alternator adapter to flywheel housing bolts, 180 kW, 7/16--14 grade 8 bolt | 85 (63) | Nm (ft. lb.) | |
| Torque | Alternator adapter to flywheel housing bolts, 40 kW, 3/8--16 grade 8 bolt | 53 (39) | Nm (ft. lb.) | |
| Torque | Alternator adapter to flywheel housing bolts, 55--150 kW John Deere, 7/16--14 grade 8 bolt | 60 (44) | Nm (ft. lb.) | |
| Torque | Alternator adapter to flywheel housing bolts, John Deere, M10 grade 10.9 bolt | 65 (48) | Nm (ft. lb.) | |
| Torque | Drive discs to flywheel bolts, 180 kW, 1/2--13 grade 8 bolt | 130 (96) | Nm (ft. lb.) | |
| Torque | Drive discs to flywheel bolts, 40 kW, 3/8--16 grade 8 stud | 53 (39) | Nm (ft. lb.) | |
| Torque | Drive discs to flywheel bolts, 55--150 kW John Deere, 3/8--16 grade 8 stud | 53 (39) | Nm (ft. lb.) | |
| Torque | Drive disks to rotor shaft bolts | 68 | Nm (50 ft. lb.) | |
| Torque | End bracket grease fitting | 9.5 | Nm (7 ft. lb.) | |
| Torque | End bracket grease vent screw | 9.5 | Nm (7 ft. lb.) | |
| Torque | End bracket to stator bolts | 47 | Nm (35 ft. lb.) | |
| Torque | Fan to rotor flange bolts | 29 | Nm (260 in. lb.) | |
| Torque | Ground lug assembly nuts | 45 | Nm (34 ft. lb.) | |
| Torque | High idle locknut / low idle locknut | 4--5 | Nm (35--45 in. lb.) | |
| Torque | Integrated actuator cover screws to pump body | 4--5 | Nm (35--45 in. lb.) | |
| Torque | Photo transistor circuit board, insulator, & magnetic actuator to rotor shaft screws | 4.7 | Nm (42 in. lb.) | |
| Torque | Return line connector assembly | 5--6 | Nm (43--55 in. lb.) | |
| Torque | SCR assembly mounting bolts | 0.9 | Nm (8 in. lb.) |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
Recommended fluids
| Fluid | Grade | Standard | Ambient | Capacity | Notes |
|---|---|---|---|---|---|
| Coolant | 50% ethylene glycol and 50% clean, softened water | above -37°C | Provides freezing protection to - 37 C (- 34 F) and overheating protection to 129 C (265 F). Less than 50% ethylene glycol may not provide adequate protection; more than 50% can cause engine or component damage. Do not use alcohol or methanol antifreeze. See spec sheet for coolant capacity. | ||
| Engine oil | Oil suited to the climate | Use oil with a viscosity suitable for the operating climate; refer to engine operation manual. | |||
| Fuel | EN 590 or ASTM D975 | Diesel fuel; maximum recommended fuel lift 2.4 m (7.9 ft); self priming fuel pump | |||
| Fuel | #2 diesel fuel | Diesel-fueled engines: fill the fuel tank with #2 diesel fuel and condition the fuel system with compatible additives to control microbial growth. |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
Fault codes
13| Code | Name | Meaning | Severity | Action |
|---|---|---|---|---|
| E0 | Controller memory failure | Governor controller memory failure (load share model display code). | Shutdown | Replace governor controller. |
| E1 | Loss of remote speed potentiometer signal | Governor controller has lost the remote speed potentiometer signal. | Warning | Check the remote speed potentiometer and its wiring. |
| E2 | Overspeed detected | Overspeed detected by the governor controller (load share model display code). | Shutdown | Governor controller must be turned off and reset to allow an engine restart. |
| E3 | Actuator drive overcurrent detected | Actuator drive overcurrent detected by the governor controller (load share model display code). | Shutdown | Check wiring. Check actuator loading and linkage. |
| Emergency Stop | Emergency Stop Shutdown (550 controller) | The local or optional remote emergency stop switch activated. | Shutdown | Correct the cause and reset the emergency stop switch, then reset the controller. |
| Hi Cool Temp Shutdown | High Coolant Temperature Shutdown (550 controller) | Engine coolant temperature reached the shutdown range; shutdown occurs 5 seconds after the engine reaches the temperature shutdown range (30 second inhibit after startup). | Shutdown | Allow the engine to cool and troubleshoot the cooling system. |
| Low Coolant Level | Low Coolant Level Shutdown (550 controller) | Low coolant level detected; shutdown occurs 5 seconds after low coolant level is detected (30 second inhibit after startup). | Shutdown | Restore the coolant to the normal operating level and check for leaks. |
| Oil Pressure Shutdown | Low Oil Pressure Shutdown (550 controller) | Low oil pressure condition detected; shutdown occurs 5 seconds after the low pressure condition is detected (30 second inhibit after startup). | Shutdown | Check the engine oil level and lubrication system. |
| Over Crank | Overcrank Shutdown (550 controller) | The unit does not start within the defined cranking period. Range 0--6 cycles; default 3 cycles with 15 sec crank and 15 sec rest. | Shutdown | Check fuel supply, starting system, and speed sensor circuitry. |
| Over Current | Overcurrent Warning (550 controller) | The generator set supplies more than 110% of the rated standby output current for more than 10 seconds. | Warning | Reduce the electrical load and check for faults in the load circuit. |
| Over Speed | Overspeed Shutdown (550 controller) | Governed frequency on 50 and 60 Hz models exceeds the overspeed setting for 0.25 seconds. Setting range 65--70 Hz (60 Hz) / 55--70 Hz (50 Hz); default 70 Hz. | Shutdown | Check governor and engine speed; reset the controller after correcting the cause. |
| Over Voltage | Overvoltage Shutdown (550 controller) | Voltage exceeds the overvoltage setting for the time delay period. Range 105%--135% of nominal; default 115% at 2 seconds. | Shutdown | Troubleshoot the voltage regulator and sensing circuits. |
| Under Voltage | Undervoltage Shutdown (550 controller) | Voltage falls below the undervoltage setting for the time delay period. Range 70%--95% of nominal; default 85% at 10 seconds. | Shutdown | Check alternator output, load, and voltage regulator. |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
Procedures
12Magnetic Pickup Adjustment adjustment
- Place the generator set master switch in the OFF/RESET position.
- Verify the flywheel is not rotating. Loosen the jam nut.
- Turn in the magnetic pickup until the pole face bottoms on the ring gear tooth.
- Back out the magnetic pickup 1/4 to 1/2 turn providing a 0.35--0.71 mm (0.014--0.028 in.) air gap.
- Tighten the jam nut without moving the magnetic pickup.
Volt/Hz Potentiometer Adjustment adjustment
Tools: 100-watt light bulb, voltmeter, frequency meter
- Turn the generator set master switch to OFF/RESET.
- Make the single- or three-phase sensing selection at switch #2.
- Turn the stability potentiometer fully counterclockwise.
- Connect a 100-watt light bulb across terminals V0 and V7 on the controller terminal strip.
- Start the generator set and adjust the stability potentiometer until minimum light bulb flicker is obtained.
- Make the frequency selection (50 or 60 Hz) at switch #1.
- Select the bias switch for No Bias Input.
- Adjust engine speed to the desired cut-in frequency (57.5--58.0 Hz for 60 Hz models or 47.5--48.0 Hz for 50 Hz models).
- Rotate the volts/Hz adjustment potentiometer clockwise until voltage begins to drop.
- Adjust engine speed to obtain full load engine speed of 1800 rpm (60 Hz) or 1500 rpm (50 Hz).
Controller Resetting (550 Controller, Following System Shutdown or Warning) diagnostic
⚠ Read the Safety Precautions and Instructions section before proceeding.
- Move the generator set master switch to the AUTO position if not already done.
- Silence the alarm horn by pressing the alarm off key.
- Disconnect the generator set load using the line circuit breaker or automatic transfer switch.
- Correct the cause of the fault shutdown or warning.
- Start the generator set by moving the master switch to OFF/RESET and then to RUN.
- Test operate the generator set to verify correction of the shutdown cause.
- Move the master switch to OFF/RESET to stop the generator set.
- Move the master switch to the AUTO position.
- Silence the alarm horn by pressing the alarm off key.
- Reconnect the generator set load via the line circuit breaker or automatic transfer switch.
LED Circuit Board (Flashlight) Test diagnostic
⚠ Do not expose the photo transistor circuit board to any external light source; exposure to light causes high voltage. Place black electrical tape over the LED before starting the set.
Tools: flashlight, voltmeter
- Remove the junction box panels from the generator end and remove the photo transistor board/LED board cover.
- With the generator set running at no load, shine a flashlight on the exposed photo transistor board.
- Observe the AC output voltmeter; high AC output voltage indicates the SCR assembly and photo transistor board are functioning.
- With the set running, approximately 1--2 volts DC should be observed at 3B (+) and 5B (--) at the LED board; the reading should drop when the flashlight is applied.
Speed Sensor Test with Generator Set Running diagnostic
⚠ Controller leads must remain connected to the speed sensor terminals during the test; slide leads only enough to expose connection for test leads.
Tools: DC voltmeter
- With the master switch in OFF/RESET, connect a DC voltmeter between the positive (+) lead (wire 24) and ground (wire 2); reading should be approximately 8--12 VDC.
- Place the master switch in the RUN position to start the generator set.
- With the set running, place the voltmeter negative probe on the 0 terminal (wire 16, white) and positive probe on the positive (+) terminal (wire 24, red); reading should be approximately 7--12 VDC.
- Place the master switch in OFF/RESET to stop the generator set.
- If a signal is present, check continuity of wires 2, 16, and 24 between the controller P1 connector and the speed sensor leads.
Speed Sensor Test with Separate 12 VDC Source diagnostic
Tools: DC voltmeter, 12-volt battery or DC power supply, flat piece of iron or steel
- Place the generator set master switch in the OFF/RESET position.
- Disconnect the speed sensor leads.
- Connect the speed sensor, DC voltmeter, and DC voltage source as shown in the manual.
- Touch the sensing surface with a flat piece of iron or steel at least 4.1 cm (1/4 cu. in.) in size.
- The DC voltmeter reading should equal the source voltage, approximately 12 VDC.
- Remove the iron or steel piece; the voltmeter should read 0 VDC.
- Connect the speed sensor leads and adjust the air gap.
Electronic Governor Actuator Installation (John Deere) installation
- Install the new cover seal into the groove of the integrated actuator cover assembly.
- Position the integrated actuator cover assembly into the top of the pump while holding the metering valve drive coupling parallel to the pump body.
- Carefully slide the cover toward the rear of the pump body until the mounting holes align.
- Use two long cover screws and one short cover screw to assemble the cover to the pump body.
- Tighten the screws to 4--5 Nm (35--45 in. lb.).
- Install a new O-ring on the return line connector, coat lightly with all-purpose grease, and install; tighten to 5--6 Nm (43--55 in. lb.).
- Install the fuel return line to the return line connector.
Exhaust System Inspection maintenance
⚠ Never operate without a functioning carbon monoxide detector.
- Shut down; disconnect battery charger and battery, negative lead first.
- Inspect manifold, mixing elbow, hoses, clamps, silencer and outlet flapper for cracks, leaks, corrosion.
- Check hoses for softness, cracks, leaks or dents; replace as needed.
- Check for corroded or broken metal parts and replace them.
- Check for loose, corroded, or missing clamps; tighten or replace.
- Confirm the exhaust outlet is unobstructed.
- Look for carbon or soot residue indicating exhaust leaks; seal leaks.
- Reconnect battery (negative lead last) and battery charger power, if equipped.
Impeller Inspection and Replacement maintenance
⚠ Follow the instructions included with the impeller kit.
Tools: Impeller kit, Silicon grease
- Shut down the generator set; disconnect battery charger and battery, negative lead first.
- Close the seacock.
- Remove the seawater pump cover plate and remove the impeller.
- Inspect impeller for damaged, cracked, broken, missing or flattened vanes.
- Lubricate the impeller with soapy water before installation.
- Install the impeller, pushing and rotating it in the engine rotation direction.
- Inspect cover plate and gasket; lubricate gasket with silicon grease and attach.
- Open the seacock, reconnect battery, start and check for leaks.
Procedure to Drain Cooling System maintenance
⚠ Hot coolant and steam can cause severe injury or death; allow the engine to cool.
- Press the generator set OFF/RESET button to shut down the generator set.
- Disconnect the power to the battery charger, if equipped.
- Disconnect the engine starting battery, negative (-) lead first.
- Deenergize the block heater, if equipped.
- Remove the pressure cap to allow the entire system to drain.
- Open the radiator and/or engine block coolant drain valve(s).
- Allow the system to drain.
- If deposits are present, refer to the flush and clean procedure.
Procedure to Flush and Clean Cooling System maintenance
Tools: Radiator cleaner
- Flush the cooling system with clean water.
- Use a radiator cleaner if the radiator still has mineral deposits.
- Follow the radiator cleaner manufacturer's instructions.
- Drain, clean, and flush the coolant recovery tank.
Procedure to Refill Cooling System maintenance
⚠ Do not add coolant to a hot engine; it can crack the cylinder block or head.
- Remove the pressure cap.
- Close the coolant drain valve(s) and tighten cooling system hose clamps.
- Open the air-bleed petcocks; close them when coolant begins to flow.
- Add coolant additives or water pump lubricants per the engine manufacturer.
- Fill with 50% ethylene glycol and 50% clean, softened water.
- Replace the pressure cap and fill the coolant recovery tank to the low mark.
- Reconnect battery (negative lead last) and battery charger power, if equipped.
- Run until the thermostat opens, stop, cool, and top up coolant.
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
Common questions
What size generator is the Kohler 125EOZ?
The Kohler 125EOZ is rated 125 kW standby (156.0 kVA).
What fuel does the Kohler 125EOZ use?
The Kohler 125EOZ runs on diesel.
How much coolant does the Kohler 125EOZ hold?
The Kohler 125EOZ cooling system holds 19 liters (5.0 US gallons) for the radiator system including the engine, per the manufacturer specification sheet.
What is the oil capacity of the Kohler 125EOZ?
The Kohler 125EOZ has an engine oil capacity of 19 liters (20.1 US quarts), per the manufacturer specification sheet.
What is the dry weight of the Kohler 125EOZ?
The Kohler 125EOZ has a dry weight of 1683 kg (3710 lb).
What voltages is the Kohler 125EOZ available in?
The Kohler 125EOZ is offered in 120/208 V, 120/240 V, 127/220 V, 139/240 V, 277/480 V, 3-phase.
How many cold cranking amps does the Kohler 125EOZ require?
The Kohler 125EOZ uses 12- or 24-volt V each, 925 CCA, per the manufacturer specification sheet.
What alternator does the Kohler 125EOZ use?
The Kohler 125EOZ uses a Fast-Response X alternator. Insulation class Class H.
What oil filter fits the Kohler 125EOZ?
The Kohler 125EOZ uses oil filter part number 223673.
Which fuel filter part number does the Kohler 125EOZ take?
The Kohler 125EOZ uses fuel filter part numbers 223414, 223953.
Parts
220model family| Part # | Description | Qty | System | |
|---|---|---|---|---|
| 222771 | Fuel filter | 1 | Fuel filter | Amazon eBay $325.00 |
| 223414 | Element, filter | 1 | Fuel filter | Amazon eBay $13.45 NAPA $34.79 |
| 223604 | Filter, oil | 1 | Oil filter | Amazon eBay $13.00 |
| 223673 | Filter, oil | 1 | Oil filter | Amazon eBay $26.99 NAPA $35.41 KuduParts $14.00 |
| 223953 | Filter, fuel | 1 | Fuel filter | Amazon eBay $80.00 NAPA $56.25 |
| 225428 | BELT | Belt | Amazon eBay $16.14 | |
| 226915 | Air Filter Element | Air filter | Amazon eBay $43.43 | |
| 229125 | V-Belt (Seawater Pump) | 1 | Belt | Amazon eBay $22.07 NAPA $17.52 FridayParts $62.70 |
| 229678 | Filter, oil | Oil filter | Amazon eBay $24.45 PartsGeek $7.98 NAPA $9.09 | |
| 229715 | Element, fuel | Fuel filter | Amazon eBay $11.99 NAPA $16.83 KuduParts $11.00 FridayParts $13.52 | |
| 229826 | Seawater Pump Impeller Kit | 1 | Impeller | Amazon eBay $45.71 NAPA $40.56 FridayParts $33.59 |
| 229955 | IMPELLER REPAIR KIT | 6 | Impeller | buy |
| 239282 | BRUSH | 2 | Brush | Amazon eBay $37.28 |
| 241481 | Switch, high temperature 268298 Sender, water temperature | 1 | Sensor | Amazon eBay |
| 249872 | Exhaust Temperature Switch (Isolated Ground Close, Open 102°C±15°C (215°F±5°F)) | Exhaust temperature switch | Amazon eBay | |
| 249989 | BELT, SEAWATER PUMP | 1 | Belt | Amazon eBay $19.76 |
| 250813 | Element, fuel | Fuel filter | Amazon eBay $14.95 | |
| 250954 | Filter, oil | Oil filter | Amazon eBay $23.00 | |
| 252834 | Filter, oil | 1 | Oil filter | Amazon eBay $27.95 PartsGeek $7.98 NAPA $9.09 |
| 252898 | Filter, fuel | Fuel filter | Amazon eBay $19.28 | |
| 253107 | Element, Air Cleaner | 1 | Air filter | Amazon eBay $69.00 NAPA $55.23 |
| 253108 | Element, air cleaner | 1 | Air filter | Amazon eBay $71.99 |
| 254471 | Element, air cleaner | Air filter | Amazon eBay $54.34 | |
| 256503 | BELT, SEAWATER PUMP | 1 | Belt | Amazon eBay $18.44 |
| 258423 | Element, air cleaner | 1 | Air filter | Amazon eBay $34.57 |
| 258646 | Element, air cleaner | Air filter | Amazon eBay $35.69 | |
| 264390 | Sender, oil pressure | 1 | Sensor | Amazon eBay |
| 267714 | Filter, oil | Oil filter | Amazon eBay $15.30 | |
| 267987 | FILTER, PRIMARY FUEL | 1 | Fuel filter | Amazon eBay $14.99 KuduParts $18.00 FridayParts $19.99 |
| 268298 | Sender, water temperature | 1 | Sensor | Amazon eBay |
| 272981 | Element, air cleaner | 4 | Air filter | Amazon eBay $449.00 |
| 272982 | Air Cleaner element (standard duty) - 350REOZV/350REOZVC | 1 | Air filter | Amazon eBay $179.95 |
| 274821 | Air Cleaner | 26 | Air filter | eBay $100.00 |
| 275501 | Filter, fuel | 1 | Fuel filter | Amazon eBay $46.38 NAPA $36.94 KuduParts $18.00 |
| 276148 | BELT | 1 | Belt | Amazon eBay $35.00 |
| 277759 | Element, Air Cleaner | 1 | Air filter | Amazon eBay $44.99 |
| 278490 | Electric fuel pump (rectangular) | 1 | Pump | buy |
| 278612 | Element, air cleaner | 1 | Air filter | Amazon eBay $29.64 |
| 278858 | Element, air cleaner | Air filter | Amazon eBay $30.48 | |
| 279218 | Filter, oil | Oil filter | Amazon eBay $18.91 NAPA $12.22 | |
| 279260 | Filter, oil | 2 | Oil filter | Amazon eBay $20.47 NAPA $37.15 |
| 279261 | Filter, fuel | Fuel filter | Amazon KuduParts $42.00 | |
| 279262 | Filter, fuel | Fuel filter | Amazon eBay $25.00 | |
| 279449 | Filter, oil | 1 | Oil filter | Amazon eBay $20.00 |
| 279736 | Element, primary | 2 | Air filter | Amazon eBay NAPA $228.15 |
| 322056-S | FILTER, SECONDARY FUEL | Fuel filter | Amazon eBay $10.32 | |
| 322536 | Filter, fuel | Fuel filter | Amazon eBay | |
| 324418 | Element, Air Cleaner(Branded 1 Per Case) | 1 | Air filter | Amazon eBay |
| 326098 | Element, air cleaner | 3 | Air filter | Amazon eBay $55.00 |
| 326099 | Element, air cleaner | 1 | Air filter | Amazon eBay $35.00 |
| 326817 | Filter, oil | 1 | Oil filter | Amazon eBay $17.13 |
| 328215 | Filter, fuel | Fuel filter | Amazon eBay $19.99 | |
| 328216 | Filter, fuel | Fuel filter | Amazon eBay | |
| 328309 | Switch assembly, pressure (oil pressure) | 1 | Sensor | Amazon eBay $45.00 |
| 336661 | Dust seal | 1 | Dust seal | Amazon eBay $33.63 PartsGeek $6.98 KuduParts $18.00 |
| 343219 | Air cleaner, industrial | 1 | Air filter | Amazon eBay |
| 343445 | Filter, oil | Oil filter | Amazon eBay $33.15 | |
| 354842 | Element, air cleaner | 4 | Air filter | Amazon eBay |
| 359771 | FILTER, OIL | 1 | Oil filter | Amazon eBay $22.46 FridayParts $66.23 |
| 359978 | IMPELLER REPAIR KIT | 1 | Impeller | FridayParts $66.23 |
| 359979 | SPARK PLUG | 2 | Spark plug | Amazon eBay $18.27 |
| 360031 | Filter, oil | 1 | Oil filter | Amazon eBay $37.99 NAPA $27.91 FridayParts $34.99 |
| 363064 | BELT | Belt | Amazon eBay $40.07 | |
| 363205 | BELT | 1 | Belt | Amazon eBay $25.11 |
| 363418 | Filter, fuel | Fuel filter | Amazon eBay $21.69 KuduParts $20.00 | |
| 365012 | Filter, oil | Oil filter | Amazon eBay $43.99 | |
| 52 050 02-S | Filter, oil | 1 | Oil filter | Amazon |
| ED0021750010-S | OIL FILTER | 1 | Oil filter | Amazon eBay $109.95 FridayParts $19.50 |
| ED0021752800-S | OIL FILTER | 1 | Oil filter | Amazon eBay $22.90 FridayParts $19.99 |
| ED0021752850-S | Oil Filter | 1 | Oil filter | Amazon eBay $24.95 NAPA $15.26 |
| ED0021752880-S | Fuel Filter Element | 1 | Fuel filter | Amazon eBay $49.95 KuduParts $14.00 FridayParts $16.25 |
| ED0021753180-S | SECONDARY FUEL FILTER | 1 | Fuel filter | Amazon eBay $72.00 KuduParts $34.00 FridayParts $36.00 |
| ED0021753200-S | SECONDARY FUEL FILTER | 1 | Fuel filter | Amazon eBay $17.99 NAPA $43.91 FridayParts $68.86 |
| GM102586 | BELT | Belt | Amazon eBay $36.71 | |
| GM103820 | PRIMARY FUEL FILTER | Fuel filter | buy | |
| GM117329 | Seawater Pump Impeller Kit | Impeller | Amazon eBay | |
| GM13224 | Filter, oil | 2 | Oil filter | Amazon eBay $60.00 NAPA $70.06 |
| GM13660 | V-BELT | Belt | Amazon eBay $23.18 | |
| GM13943 | Oil Filter (bypass) | 1 | Oil filter | Amazon eBay $46.75 |
| GM13947 | Filter, fuel | 4 | Fuel filter | Amazon eBay $79.99 NAPA $16.98 |
| GM15402 | BELT | 1 | Belt | Amazon eBay $34.50 |
| GM16114 | Filter, oil | Oil filter | Amazon eBay $19.99 | |
| GM16532 | Filter, oil | Oil filter | Amazon eBay $4.84 | |
| GM16703 | Filter, oil | 1 | Oil filter | Amazon eBay $58.00 NAPA $3.59 |
| GM16944 | Element, air cleaner | 1 | Air filter | Amazon eBay $49.68 NAPA $41.18 |
| GM18704 | BELT | Belt | Amazon eBay | |
| GM18793 | IMPELLER REPAIR KIT | 1 | Impeller | Amazon eBay $49.95 |
| GM18808 | FILTER, SECONDARY FUEL | 1 | Fuel filter | Amazon eBay $20.00 |
| GM18821 | FILTER, PRIMARY FUEL | 1 | Fuel filter | Amazon eBay $49.99 |
| GM20852 | IMPELLER REPAIR KIT | Impeller | buy | |
| GM24543 | O-Ring | 1 | Seal | buy |
| GM25504 | Oil filter | 2 | Oil filter | Amazon eBay $184.15 NAPA $21.84 |
| GM25506 | Oil filter bypass | Oil filter | Amazon eBay $35.00 NAPA $43.20 FridayParts $99.99 | |
| GM25508 | Filter, oil | 2 | Oil filter | Amazon eBay $14.95 |
| GM25537 | Filter, fuel | 2 | Fuel filter | Amazon eBay $28.00 FridayParts $32.00 |
| GM25552 | Fuel filter/water separator | 1 | Fuel filter | Amazon eBay $14.99 |
| GM25554 | Fuel filter | 1 | Fuel filter | Amazon eBay $19.99 |
| GM28351 | Filter, oil | 1 | Oil filter | Amazon eBay $19.46 NAPA $9.09 |
| GM29290 | Oil Pressure Sender (Decision-Maker 550) | Oil pressure sender | Amazon eBay | |
| GM30263 | Low Seawater Pressure Switch | Low seawater pressure switch | Amazon eBay | |
| GM30594 | Filter, fuel, secondary | Each or Case of 6 | Fuel filter | Amazon eBay $60.00 KuduParts $59.00 |
| GM31045-1 | Coolant Temperature Sender (Decision-Maker 550) | 1 | Coolant temperature sender | Amazon eBay |
| GM32359 | Filter, fuel | 1 | Fuel filter | Amazon eBay $26.87 NAPA $27.27 KuduParts $20.00 |
| GM32809 | FILTER, OIL | 1 | Oil filter | Amazon Amazon Amazon Amazon eBay $26.25 NAPA $28.76 |
| GM34570 | FILTER, SECONDARY FUEL | 1 | Fuel filter | Amazon eBay $34.05 |
| GM35825 | BELT | 1 | Belt | Amazon eBay $133.60 |
| GM35826 | SPARK PLUG | 4 | Spark plug | Amazon eBay $13.00 NAPA $2.64 |
| GM39458 | Coolant Temperature Sender (Decision-Maker 3+) | 1 | Sensor | Amazon eBay |
| GM40998 | BELT | Belt | Amazon eBay $45.65 | |
| GM40999 | FILTER, OIL | Oil filter | Amazon eBay $40.00 | |
| GM41014 | PRIMARY FUEL FILTER | Fuel filter | Amazon eBay $70.50 | |
| GM46180 | SPARK PLUG | 2 | Spark plug | Amazon eBay $15.14 |
| GM47044 | BELT | Belt | Amazon eBay $33.24 | |
| GM47208 | Water Temperature Sender (Decision-Maker 550) | Water temperature sender | Amazon eBay | |
| GM47465 | Filter, oil | 1 | Oil filter | Amazon eBay $23.52 FridayParts $20.19 |
| GM48727 | FILTER, PRIMARY FUEL | 1 | Fuel filter | Amazon eBay $24.99 |
| GM48728 | FILTER, SECONDARY FUEL | 1 | Fuel filter | Amazon eBay $100.76 |
| GM48729 | FILTER, PRIMARY FUEL | 1 | Fuel filter | Amazon eBay $24.99 |
| GM48730 | FILTER, SECONDARY FUEL | 1 | Fuel filter | Amazon eBay $25.50 |
| GM48731 | FILTER, OIL | 1 | Oil filter | Amazon eBay $49.99 NAPA $3.59 |
| GM49315 | FILTER, SECONDARY FUEL | Fuel filter | Amazon eBay $15.75 | |
| GM49316 | IMPELLER REPAIR KIT | Impeller | buy | |
| GM50200 | Oil Filter | Oil filter | Amazon eBay | |
| GM50263 | FILTER, PRIMARY FUEL (Includes primary and secondary filter elements) | 1 | Fuel filter | Amazon eBay $99.99 |
| GM50644 | IMPELLER REPAIR KIT | 1 | Impeller | Amazon eBay $30.00 |
| GM53040 | BELT, SEAWATER PUMP | Belt | Amazon eBay $19.94 | |
| GM77091 | BELT, SEAWATER PUMP | 1 | Belt | buy |
| GM86446 | Air Filter Element | Air filter | Amazon eBay $34.99 KuduParts $43.00 | |
| GM87479 | Air Filter Element | Air filter | Amazon eBay | |
| GM88686 | BELT | Belt | Amazon eBay $43.03 | |
| GM90310 | Air Filter Element | Air filter | Amazon eBay | |
| GM90645 | BELT, SEAWATER PUMP | 1 | Belt | Amazon eBay $30.30 |
| GM91974 | FUEL FILTER KIT | Fuel filter | Amazon eBay | |
| GM98756 | IMPELLER REPAIR KIT | Impeller | Amazon eBay | |
| GM98801 | BELT | Belt | Amazon eBay | |
| GM98860 | Air Filter Element | Air filter | Amazon eBay | |
| RDO-26 | Loss of ECM Communication RDO-26* | 4 | ECM / ECU | Amazon eBay |
| X-6348-6 | DECAL | 12 | Decals | Amazon eBay |
| X-6348-9 | DECAL | 1 | Decals | buy |
| 100EFOZCJ | Generator † Model | 1 | Service part / kit | eBay |
| 125EFOZCJ | Generator † Model | 1 | Service part / kit | eBay |
| 125EOZCJ | Generator † Model | 1 | Service part / kit | eBay |
| 150EOZCJ | Generator † Model | 1 | Service part / kit | eBay |
| 223316 | Fuse, 10 A, 250 V | 1 | Service part / kit | Amazon eBay $31.37 |
| 239298 | Fuse: Customer Connection (F3) 5 Amp | 1 | Service part / kit | Amazon eBay $7.74 NAPA $2632.97 |
| 243273 | Fuse, 3 amp | 5 | Service part / kit | Amazon eBay |
| 250719 | 10-AMP CIRCUIT BREAKER | Service part / kit | eBay $39.88 | |
| 257938 | Rotor Assembly | Service part / kit | buy | |
| 258405 | 8-AMP FUSE | 5 | Service part / kit | Amazon eBay $15.60 |
| 260085 | ZINC ANODE KIT | 1 | Service part / kit | Amazon eBay $16.99 |
| 262389 | FUSE, 25-AMP | 5 | Service part / kit | Amazon eBay $14.83 |
| 267928 | ZINC ANODE KIT | 1 | Service part / kit | buy |
| 283645 | Fuse, 15 Amp | 5 | Service part / kit | Amazon eBay |
| 33EFOZCJ | Generator † Model | 1 | Service part / kit | eBay |
| 344835 | CONTAINER | 1 | Service part / kit | eBay |
| 345355 | Cap, Valve | 8 | Service part / kit | buy |
| 352142 | ZINC ANODE KIT | 1 | Service part / kit | Amazon eBay $26.09 |
| 358337 | Fuse: Auxiliary Winding (F1) 10 Amp | 1 | Service part / kit | Amazon eBay $45.17 NAPA $65.06 |
| 40EOZCJ | Generator † Model | 1 | Service part / kit | eBay |
| ED0090802150-S | ZINC ANODE KIT | 1 | Service part / kit | Amazon eBay $60.67 |
| ED0090802840-S | ZINC ANODE KIT | 1 | Service part / kit | Amazon eBay $92.76 |
| GM105310 | KIT NUMBER (genuine parts kit) | Service part / kit | eBay | |
| GM12310 | KIT NUMBER | Service part / kit | buy | |
| GM12314 | KIT NUMBER (genuine parts kit) | Service part / kit | eBay | |
| GM13949 | Filter, oil | 4 | Service part / kit | Amazon eBay |
| GM20849 | FUSE, 10 AMP | Service part / kit | buy | |
| GM20851 | FUSE, 25 AMP | Service part / kit | buy | |
| GM20853 | ZINC ANODE KIT | Service part / kit | buy | |
| GM24404 | KIT NUMBER | Service part / kit | buy | |
| GM29427 | Valve, Mixer | Service part / kit | buy | |
| GM32330 | KIT NUMBER | Service part / kit | buy | |
| GM32331 | KIT NUMBER | Service part / kit | buy | |
| GM32338 | KIT NUMBER | Service part / kit | buy | |
| GM39266 | Fuse: Controller, Fuel Pump, and Fuel Shutoff Solenoid (F2) 20 Amp | 5 | Service part / kit | Amazon eBay $14.88 |
| GM42337 | 10-AMP FUSE | 5 | Service part / kit | buy |
| GM42339 | 25-AMP FUSE | 5 | Service part / kit | buy |
| GM47427 | FUSE, 20-AMP | 5 | Service part / kit | buy |
| GM48014 | BELT, SEAWATER PUMP | 1 | Service part / kit | buy |
| GM48015 | KIT NUMBER | Service part / kit | buy | |
| GM51354 | KIT NUMBER | Service part / kit | buy | |
| GM51355 | KIT NUMBER | Service part / kit | buy | |
| GM51356 | KIT NUMBER | Service part / kit | buy | |
| GM51357 | KIT NUMBER | Service part / kit | buy | |
| GM51358 | KIT NUMBER | Service part / kit | buy | |
| GM84053 | KIT NUMBER (genuine parts kit) | Service part / kit | eBay | |
| GM84054 | KIT NUMBER (genuine parts kit) | Service part / kit | eBay | |
| GM89804 | Sea Spares® kit | Service part / kit | buy | |
| GM89805 | Sea Spares® kit | Service part / kit | buy | |
| GM95659 | KIT NUMBER (genuine parts kit) | Service part / kit | eBay | |
| GM95660 | Sea Spares® kit | Service part / kit | buy | |
| GM99047 | Sea Spares® kit | Service part / kit | buy | |
| GV15402 | CIRCUIT BREAKER, 10-AMP | 1 | Service part / kit | buy |
| GV42337 | FUSE, 10-AMP | 5 | Service part / kit | buy |
| GV42339 | FUSE, 25-AMP | 5 | Service part / kit | buy |
| RDO-01 | Overspeed Shutdown RDO-01 (lead 39) | 10 | Service part / kit | Amazon eBay |
| RDO-03 | High Cool Temp Shutdown RDO-03 (lead 36) | 10 | Service part / kit | Amazon eBay |
| RDO-04 | High Oil Temp Shutdown RDO-04 (lead 38) | 10 | Service part / kit | Amazon eBay |
| RDO-05 | Low Coolant Temp Warning RDO-05 (lead 35) | 10 | Service part / kit | Amazon eBay |
| RDO-06 | High Cool Temp Warning RDO-06 (lead 40) | 10 | Service part / kit | Amazon eBay |
| RDO-07 | High Oil Temp Warning RDO-07 (lead 41) | 10 | Service part / kit | Amazon eBay |
| RDO-08 | Low Fuel Warning RDO-08 (lead 63) | 9 | Service part / kit | Amazon eBay |
| RDO-09 | Master Switch Error RDO-09 (lead 80) | 10 | Service part / kit | Amazon eBay |
| RDO-10 | NFPA 110 Fault RDO-10 (lead 32) | 10 | Service part / kit | Amazon eBay |
| RDO-12 | Low Battery Voltage RDO-12 (lead 62) | 10 | Service part / kit | Amazon eBay |
| RDO-14 | Emergency Stop RDO-14 (lead 48) | 10 | Service part / kit | Amazon eBay |
| RDO-15 | Generator Set Running RDO-15 (lead 70R) | 10 | Service part / kit | Amazon eBay |
| RDO-16 | Time Delay Engine Cooldown (TDEC) | 1 | Service part / kit | Amazon eBay |
| RDO-17 | System Ready | 1 | Service part / kit | Amazon eBay |
| RDO-18 | Defined Common Fault | 10 | Service part / kit | Amazon eBay |
| RDO-19 | Low Coolant Level Shutdown RDO-19 | 10 | Service part / kit | Amazon eBay |
| RDO-20 | Over Voltage Shutdown RDO-20 (lead 26) | 7 | Service part / kit | Amazon eBay |
| RDO-22 | EPS Supplying Load RDO-22 | 10 | Service part / kit | Amazon eBay |
| RDO-23 | Fuel Valve Relay | 10 | Service part / kit | Amazon eBay |
| RDO-24 | Reverse Power Shutdown | 1 | Service part / kit | Amazon eBay |
| RDO-25 | Weak Battery Off Warning RDO-25 | Service part / kit | Amazon eBay | |
| RDO-27 | Underfrequency Shutdown | 1 | Service part / kit | Amazon eBay |
| RDO-28 | Over Speed Shutdown RDO-28 | 7 | Service part / kit | Amazon eBay |
| RDO-29 | Time Delay Engine Cooldown RDO-29 | 8 | Service part / kit | Amazon eBay |
| RDO-30 | Load Shed KW Overload RDO-30 | 10 | Service part / kit | Amazon eBay |
| RDO-31 | Load Shed Underfrequency RDO-31 | 10 | Service part / kit | Amazon eBay |
Compiled from this model's family documentation — may include parts for closely-related variants. Confirm the exact part for your serial number. See the full parts catalog to search and cross-reference.
Fuel consumption
| Rating | Load | L/h | gal/h |
|---|---|---|---|
| Prime | 25% | 12.7 | 3.4 |
| Prime | 50% | 21.4 | 5.7 |
| Prime | 75% | 31.2 | 8.2 |
| Prime | 100% | 39.5 | 10.4 |
| Standby | 25% | 12.7 | 3.35 |
| Standby | 50% | 19.3 | 5.1 |
| Standby | 75% | 26.3 | 6.95 |
| Standby | 100% | 33.9 | 8.97 |
Available documents
Spec sheet (Kohler)Spec sheet — 007165-01 MAR Commercial SpecificationSheetRevise v2 (Kohler)Spec sheet — Commercial SpecSheet (Kohler)Spec sheet — g2157 (Kohler)Spec sheet — g2166 (Kohler)Operator's manual — tp6861 (Kohler)Reference (Kohler)Reference — 2017-Marine-Product-Guide-g12480 (Kohler)Reference — G18095 (Kohler)Reference — Kohler-Marine (Kohler)Reference — Kohler-Pleasure-Craft-Marine-Generators (Kohler)Reference — Marine pocket guide (Kohler)Reference — PleasureCraft SpecificationSheet (Kohler)Reference — g12440 (Kohler)Reference — g12447 (Kohler)Parts manual (Kohler)Parts manual — 12816951-1abd-4f63-895a-49490104cb9c (Kohler)Parts manual — 2017-Sea-Spares-Brochure-g12202 (Kohler)Parts manual — G12-202-11-20-Sea-Spares-Kits-brochure (Kohler)Parts manual — MAR CommercialBroch2015 (Kohler)Parts manual — g260412 (Kohler)Service manual — tp6442 eng bg9k (Kohler)
This page was generated from the 22 manufacturer documents above by automated extraction; every figure shown is copied from one of them. How the data is compiled.