Service parts for the lsg-875
Grouped by system, with how many of each the parts manual calls for.
Belts
1 requiredPrices captured from merchant listings; some links are affiliate links. Confirm against your serial number before ordering.
Specifications
| Fuel | Natural Gas |
|---|---|
| Frequency | 60.0 Hz |
| Standby power | 70 kW |
| Standby kVA | 87 |
| Prime power | 60 kW |
| Controller | UR 15 |
| Oil capacity | 6.2 L |
| Alternator | 15 |
| Voltage options | 120/240 V, 120/208 V, 127/220 V, 139/240 V, 240/416 V, 254/440 V, 277/480 V, 347/600 V |
| Phase | 3 |
| Rated current | 210 A |
| Power factor | 0.8 |
| Circuit breaker | 15 A |
| Battery group | SEE |
| Battery cranking | 259 CCA |
| Battery voltage | 12 V |
| Battery quantity | 1 |
| Coolant capacity | 28 L |
| Dimensions (L×W×H) | 1940×880×1940 mm |
| Dry weight | 901 kg |
Engine
| Oil capacity | 6.2 L |
|---|---|
| Coolant capacity | 28.0 L |
| Displacement | 7.5 L |
| Aspiration | Natural Gas |
| Rated speed | 1800 rpm |
Maintenance & consumables
for the Ford LSG-875-6005A| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | — | 500 hr | |||
| Fuel filter | — | 7 hr | |||
| Oil filter | — | 500 hr | |||
| Battery | — | 500 hr | |||
| Belt | M-1702 | 500 hr | Amazon eBay | ||
| Coolant | Coolant | 28.0 L | — | ||
| Coolant filter | — | ||||
| Oil | 6.2 | — | 7 hr | ||
| Spark plug | — | 1000 hr |
Service specifications
52| Type | Item | Value | Unit | Condition |
|---|---|---|---|---|
| Gap | Speed sensor air gap | 0.020 | in. (0.508 mm) | |
| Gap | Speed sensor air gap | 0.36- 0.71 | mm | |
| Other | Exciter current delivery time (Fast-Response II) | 0.05 | seconds | change in load demand |
| Other | Overvoltage shutdown threshold | 15% or more over nominal | shutdown after approximately one second | |
| Pressure | Battery equalizer input voltage (24 volts nominal) | 20- 35 | volts | |
| Pressure | Battery equalizer output voltage | (input voltage/2) ±2% | volts | |
| Pressure | Low oil pressure shutdown (diesel models) | 5.5 to 10.5 | psi (38 to 72 kPa) | |
| Pressure | Low oil pressure shutdown (gasoline models) | 11.5 to 18.5 | psi (79 to 126 kPa) | |
| Pressure | Pressure switch 364345 | 483 ±14 | kPa | |
| Resistance | CR relay coil resistance | approximately 125 | Ohms | 12-Volt coil; measure between terminals A and B |
| Resistance | CR relay normally closed contacts (continuity) | 1-7, 2-8, 3-9 | ||
| Resistance | Exciter armature low resistance reading (faulty if below) | under 0.1-0.2 | ohms | |
| Resistance | Generator field F3-F4 continuity | 2-3.75 | ohms, +5% | |
| Resistance | Photo transistor board reading (covered) | 300K | ohms or higher | covered |
| Resistance | Photo transistor board reading (lit) | 5K | ohms or lower | bright flashlight on board |
| Resistance | Pressure sender 264390 value A | 240 +17/- 15 | ohms at 0 psi | |
| Resistance | Pressure sender 264390 value B | 153 +12/- 15 | ohms at 25 psi | |
| Resistance | Pressure sender 264390 value C | 33.5 | ohms at 100 psi | |
| Resistance | Pressure sender 365624 value A | 241 ±16 | ohms at 0 psi | |
| Resistance | Pressure sender 365624 value B | 152 ±13 | ohms at 50 psi | |
| Resistance | Pressure sender 365624 value C | 33.5 | ohms at 200 psi | |
| Resistance | Temperature sender 226717 value A | 123.8 +7.2/- 7.8 | ohms at 90.6 C (195 F) | |
| Resistance | Temperature sender 226717 value B | 35.6 +3.4/- 3.6 | ohms at 137.8 C (280 F) | |
| Resistance | Temperature sender 226919 value A | 942 ±22 | ohms at 37.7 C (100 F) | |
| Resistance | Temperature sender 226919 value B | 35 | ohms at 115.6 C (240 F) | |
| Speed | Governed speed (50 Hz models) | 1500 | rpm | |
| Speed | Governed speed (60 Hz models) | 1800 | rpm | |
| Speed | Governor speed droop | 3 Hz or 90 rpm | between no load and full load | |
| Speed | No-load frequency (50 Hz operation) | 53 | Hz | no load |
| Speed | No-load frequency (60 Hz operation) | 63 | Hz | no load |
| Speed | Overspeed shutdown | 70 | Hz | 60 Hz models |
| Speed | Overspeed shutdown (50 Hz sets) | 60 | Hz | |
| Speed | Overspeed shutdown (60 Hz sets) | 70 | Hz | |
| Temperature | Battery equalizer operating temperature | - 40 to 71 | C (- 40 F to 160 F) | |
| Temperature | Low water temperature start-up threshold | below 70 | °F (21°C) | 10-second start-up |
| Temperature | Temperature switch 241308 | 107 ±4 | C (225 F ±7 F) | normally open to close on temp. rise |
| Temperature | Temperature switch 290090/GM51705 | 16 ±3 | C (60 F ±5 F) | normally open to close on temp. fall |
| Torque | Drive disc mounting bolts | 50 | ft. lbs. (108.48 Nm) | |
| Torque | FR Activator mounting screws | 20-26 | in. lbs. (2.8-2.8 Nm) | |
| Torque | FR Activator terminal screws A and F | 20-25 | in. lbs. (2.3-2.8 Nm) | |
| Torque | Fan bolts | 260 | in. lbs. (29.4 Nm) | |
| Voltage | 1CR relay test voltage at P5 pin 10 to ground | 0.5 to 1.0 | volts | on-crank cycle |
| Voltage | Battery high volts lamp setpoint (12-volt systems) | 15 | volts | |
| Voltage | Battery high volts lamp setpoint (24-volt systems) | 30 | volts | |
| Voltage | Battery low volts lamp setpoint (12-volt systems) | 10 | volts | |
| Voltage | Battery low volts lamp setpoint (24-volt systems) | 20 | volts | |
| Voltage | CR relay test voltage at P5 pin 9 to ground | 0.5 to 1.0 | volts | Generator Master Switch in TEST position |
| Voltage | High voltage test (exciter armature A1 or A2 to rotor shaft) | 4,100 | volts AC | not more than one second |
| Voltage | High voltage test (generator field F3 or F4 to shaft) | 1,100 | volts AC | not more than one second; do not repeat test |
| Voltage | LED board output at 3B(+) and 5B(-) | 1-2 | Volts DC | generator set running |
| Voltage | Speed sensor voltage, wire 2 (black) & 16 (white) | 3- 6 | volts DC | |
| Voltage | Speed sensor voltage, wire 2 (black) & 24 (red) | 8- 10 | volts DC |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
Procedures
12Bosch Electronic Governor Stability and Gain Adjustment adjustment
- Check that the stability control is in its extreme counterclockwise position.
- Start engine. Allow the governor to control the engine. If engine is unstable, turn the gain control counterclockwise until stability is obtained. Adjust speed screw to proper engine speed.
- Turn the gain control clockwise until the engine becomes just unstable. Back the gain control slightly counterclockwise until the engine is again stable.
- Turn the stability control clockwise until the engine becomes just unstable. Back the stability control slightly counterclockwise until the engine is again stable.
Diesel Mechanical Governor Frequency Adjustment adjustment
Tools: Frequency meter
- Start the generator set, observe the frequency meter.
- Loosen the fuel pump high speed screw locknut to make the adjustments.
- To increase or decrease the frequency (at no load), rotate the screw clockwise or counterclockwise respectively.
- Tighten the locknut.
- Loaded droop frequency may alternately be adjusted to the operating frequency at full load.
Gas/Gasoline Mechanical Governor Speed and Sensitivity Adjustment adjustment
Tools: Hand tachometer, Frequency meter
- With the set running at full or rated load, check speed with hand tachometer or frequency meter.
- Loosen locking nut on speed adjusting screw; turn clockwise to increase speed (and frequency) or counterclockwise to decrease; lock nut at new setting.
- For sensitivity, loosen the nut at bottom of adjusting eyebolt and tighten the top nut to draw the head of the eyebolt closer to the governor arm pivot point (more sensitive).
- To make governor control less sensitive, loosen the top nut and tighten the bottom nut to move the head away from the pivot point.
- Recheck speed after sensitivity adjustment since changing this will also affect speed.
Generator Frequency Change (60 Hz to 50 Hz) adjustment
Tools: Frequency meter
- On Microcomputer equipped generators, snip the jumper indicated in Figure A1 to convert from 60 Hz to 50 Hz.
- Check frequency meter for a no load reading of 63 Hz for 60 Hz operation and 53 Hz for 50 Hz operation.
- If equipped with isochronous governor, check for 60 and 50 Hz operation at no load.
- If no frequency meter, connect meter across VO and V7 on control board terminal strip (set must not be running while making connection).
High and Low Battery Voltage Indicator Adjustment adjustment
Tools: DC power supply
- Move Generator Master Switch to AUTO position. SYSTEM READY lamp should go on.
- Rotate potentiometers R42 (High Batt. Volts) and R25 (Low Batt. Volts) fully counterclockwise.
- Set DC power supply at 10 volts (20 volts for 24-volt units). Slowly rotate pot R25 clockwise until BAT. LOW VOLTS lamp lights.
- Set DC power supply at 15 volts (30 volts for 24-volt units). Slowly rotate pot R42 clockwise until BAT. HIGH VOLTS lamp lights.
- Set DC power supply between 10 to 15 volts (20 to 30 volts for 24-volt units). SYSTEM READY lamp should be on.
- Seal pots after settings have been established.
Overfrequency Adjustment (Over/Underfrequency Relay, Decision-Maker 3+) adjustment
- Turn the overfrequency adjustment potentiometer fully clockwise (CW).
- Place master switch in RUN to start the generator set.
- Adjust governor per engine operation manual, engine service manual, or governor section of this manual.
- Slowly turn overfrequency potentiometer counterclockwise (CCW) until the LED starts flashing; after about 10 seconds the set shuts down on auxiliary fault.
- Place master switch to OFF/RESET to reset the controller.
- Place master switch to RUN to start the generator set.
- Readjust the governor to the desired frequency as required.
- Place master switch to OFF/RESET to stop the generator set.
Overvoltage Feature Testing and Adjustment (Decision-Maker 3+) adjustment
⚠ Hazardous voltage. Moving parts. Will cause severe injury or death. Operate the generator set only when all guards and electrical enclosures are in place.
⚠ Disconnecting the electrical load. Hazardous voltage will cause severe injury or death.
- Disconnect generator set from load by opening line circuit breaker or disconnecting and taping output leads.
- Determine overvoltage shutdown value based on user requirement; factory setting is 15% above nominal line-to-neutral voltage.
- Remove the controller cover.
- Place master switch in RUN to start the generator set.
- Observe AC voltmeter; turn voltage adjustment potentiometer CW until generator set shuts down.
- If the shutdown point is correct, go to step 12; otherwise continue.
- Turn controller circuit board R42 adjustment potentiometer fully CW.
- Place master switch to OFF/RESET to reset; then to RUN to start.
- Observe AC voltmeter while turning voltage adjustment potentiometer to desired overvoltage shutdown point.
- Turn R42 adjustment potentiometer slowly CCW until the generator set shuts down.
- Turn controller voltage adjustment potentiometer slightly CCW.
- Place master switch OFF/RESET then RUN to start; adjust for correct voltage and phase.
- Place master switch OFF/RESET to stop.
- Disconnect battery negative lead first; reconnect generator set to load; reconnect battery negative lead last.
Reactive Droop Compensator Adjustment Procedure adjustment
Tools: Voltmeter, Wattmeter
- Remove any load; start each generator set with master switch in RUN.
- Set reactive droop compensator rheostat on generator set no. 1 to minimum CCW; record rpm/frequency and voltage at 1/4 load steps to full load.
- Repeat for generator set no. 2.
- Compare readings; adjust voltage within 1 volt and speed within 3 rpm (or 0.1 Hz) at each load step.
- Check droop compensation on each unit with an inductive load 1/2 to full load.
- Adjust rheostat to approximately 4% below rated voltage at full load.
- Repeat for unit no. 2.
Reactive Droop Compensator Alternate Adjustment Procedure adjustment
Tools: Voltmeter
- Turn reactive droop compensator rheostat on generator set no. 1 to minimum setting.
- Remove controller cover; move voltage sensing lead from V7 to V9 at the AC fuse terminal block.
- Remove any load connected to the generator set.
- Start the generator set with master switch in RUN.
- Use controller or remote voltage adjusting potentiometer to fine adjust voltage.
- Apply resistive load (1.0 power factor) until reaching rated current.
- Adjust reactive droop compensator rheostat to achieve a 4% droop in voltage.
- Remove the resistive load and stop the generator set.
- Return voltage sensing lead from V9 to V7 at the AC fuse terminal block.
- Replace the controller cover and repeat for generator set no. 2.
Underfrequency Adjustment (Over/Underfrequency Relay, Decision-Maker 3+) adjustment
- Turn underfrequency adjustment potentiometer fully clockwise (CW).
- Place master switch in RUN to start the generator set.
- Adjust governor per engine operation manual, engine service manual, or governor section of this manual.
- Slowly turn underfrequency potentiometer counterclockwise (CCW) until LED starts flashing; after about 10 seconds the set shuts down on auxiliary fault.
- Place master switch to OFF/RESET to reset the controller.
- Place master switch to RUN to start the generator set.
- Readjust the governor to the desired frequency as required.
- Place master switch to OFF/RESET to stop the generator set.
2-Wire Low Water Level Sender Test diagnostic
⚠ Hot engine and exhaust system can cause severe injury or death. Do not work on the generator set until it cools.
⚠ Hazardous voltage. Moving parts. Will cause severe injury or death. Operate the generator set only when all guards and electrical enclosures are in place.
Tools: DC voltmeter
- Measure DC voltage between lead 31A (+) and ground (- ) with sender submerged in coolant; voltmeter indicates approximately 12.5 VDC.
- Measure DC voltage between lead 31A (+) and ground (- ) with sender removed from coolant for at least 5-15 seconds; voltmeter indicates a drop to approximately 7 VDC.
3-Wire Low Water Level Sender Test diagnostic
⚠ Hot engine and exhaust system can cause severe injury or death. Do not work on the generator set until it cools.
⚠ Hazardous voltage. Moving parts. Will cause severe injury or death.
Tools: Ohmmeter
- Measure resistance between lead 31 and ground with sender submerged in coolant; ohmmeter indicates a high resistance reading.
- Measure resistance between lead 31 and ground with sender removed from coolant for at least 5-15 seconds; ohmmeter indicates a low resistance reading.
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
Voltage reconnection
| Voltage | Phase | Connection | Leads | Notes |
|---|---|---|---|---|
| 120/208 or 139/240 | 3-Phase | 4-Wire Low Wye | 60Hz, 120/208-Volt or 139/240-Volt 3-Phase, 4-Wire Low Wye; 50Hz, 120/208-Volt or 110/190-Volt 3-Phase, 4-Wire Low Wye | |
| 120/240 | 1-Phase | 3-Wire | 60Hz, 120/240-Volt, 1-Phase, 3-Wire; 50Hz, 110/220-Volt, 1-Phase, 3-Wire | |
| 120/240 | 3-Phase | 4-Wire Delta | 60Hz, 120/240-Volt, 3-Phase, 4-Wire, Delta; 50Hz, 110/220-Volt, 3-Phase, 4-Wire, Delta. CT3 - Not Used | |
| 277/480 | 3-Phase | 4-Wire High Wye | 60Hz, 277/480-Volt, 3-Phase, 4-Wire High Wye; 50Hz, 220/380-Volt, 3-Phase, 4-Wire High Wye |
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 is the power rating of the Cummins/Onan lsg-875?
The Cummins/Onan lsg-875 is rated 70 kW standby (87.5 kVA).
What engine does the Cummins/Onan lsg-875 use?
The Cummins/Onan lsg-875 is powered by the Ford LSG-875-6005A engine.
What fuel does the Cummins/Onan lsg-875 use?
The Cummins/Onan lsg-875 runs on Natural Gas.
What's the oil capacity on a Cummins/Onan lsg-875?
The Ford LSG-875-6005A engine in the Cummins/Onan lsg-875 has an oil capacity of 6.2 liters.
What is the cooling system capacity of the Cummins/Onan lsg-875?
The Cummins/Onan lsg-875 cooling system holds 28 liters (7.4 US gallons) for the radiator system including the engine, per the manufacturer specification sheet.
What is the continuous rating of the Cummins/Onan lsg-875?
The Cummins/Onan lsg-875 is rated 60 kW prime (87 kVA), against 70 kW standby.
How much does the Cummins/Onan lsg-875 weigh?
The Cummins/Onan lsg-875 has a dry weight of 901 kg (1986 lb).
What voltages is the Cummins/Onan lsg-875 available in?
The Cummins/Onan lsg-875 is offered in 120/240 V, 120/208 V, 127/220 V, 139/240 V, 240/416 V, 254/440 V, 3-phase.
What size battery does the Cummins/Onan lsg-875 need?
The Cummins/Onan lsg-875 uses 1 battery, 12 V each, 259 CCA, group SEE, per the manufacturer specification sheet.
What alternator does the Cummins/Onan lsg-875 use?
The Cummins/Onan lsg-875 uses a 15 alternator.
Troubleshooting
6Symptoms & remedies
| Symptom | Remedy |
|---|---|
| Engine stops cranking and fault lamp lights, after cranking approximately 75 seconds. | See engine service manual for troubleshooting fuel system, ignition system, etc. After correcting problem, reset engine monitor relay by placing Run-Stop/Reset-Remote switch to Stop/Reset, then back to the required running position. |
| Fault lamp lights immediately after engine starts. | Check for: Overspeed condition as engine starts. |
| Fault lamp lights and engine shuts down after running for a period. | A. Oil level. Engine will shut down if sensor is closed. b. Check engine manual for troubleshooting oil system. c. High engine temperature. Check coolant level; check water flow (city water cooled systems); check radiator for free air flow, and fan belts for tightness. See engine manual for troubleshooting cooling system. d. Check for faulty oil pressure sensor or faulty high engine temperature sensor. |
| Engine runs, shuts down and cranks for 75 seconds. Cranking cycle stops; fault lamp lights. | Check fuel supply. Check ignition system. |
| Fault lamp lights, no fault exists. | To check a no-fault condition, disconnect leads from TB11 terminals 29, 30 and 31. If fault lamp lights with leads disconnected, replace engine monitor board. Reconnect leads. |
| Overcrank fault lamp lights and engine stops cranking after approximately 75 seconds. | See engine service manual for troubleshooting fuel system, ignition system, etc. After correcting fault, reset engine monitor relay by placing Run-Stop/Reset-Remote switch to Stop/Reset position, depressing Reset button, then to the required running position. |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing. Full Cummins/Onan lsg-875 troubleshooting guide (16 entries) →
Repair guides
14- Bosch Electronic Governor Stability and Gain Adjustment
- Diesel Mechanical Governor Frequency Adjustment
- End Bracket Removal
- Exciter Armature Test
- FR Activator Replacement
- Gas/Gasoline Mechanical Governor Speed and Sensitivity Adjustment
- Generator Field Continuity and High Voltage Test
- Generator Frequency Change (60 Hz to 50 Hz)
- Generator Reconnection (Voltage Change)
- High and Low Battery Voltage Indicator Adjustment
- LED Circuit Board (Flashlight) Test
- Photo Transistor Board Test
- Resetting After Fault Shutdown (Microcomputer Controller)
- Stopping the Generator Set (Microcomputer Controller)
Step-by-step procedures compiled from the Cummins/Onan service manual for this model.
Parts
5| Part # | Description | Qty | System | |
|---|---|---|---|---|
| C20E-6734-A | old drain plug seal | Seal | Amazon eBay | |
| EQEE-6734-AA | metric drain plug seal | Seal | Amazon eBay | |
| ESAE-6734-AA | drain plug seal | Seal | Amazon eBay | |
| DZAE-6730-AA | oil pan drain plug | Service part / kit | Amazon eBay | |
| E5AE-6730-AA | metric drain plug | Service part / kit | Amazon eBay |
Service, wear & replacement parts referenced for this model and its engine — 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 | 100% | 1000.0 | 37.25 |
| Standby | 100% | 7.8 | 8.2 |
Available documents
Spec sheet — tp6356es (Unknown (TP-6356-ES))Owner's manual — 928-0121 Onan EN ENT Genset Operator's manual (10-1986) (Cummins/Onan)Owner's manual — tt589 (Kohler)Parts manual — pb31 (Various (Cummins, Ford, John Deere, DDC))Parts manual — tp5614 (Kohler)Parts manual — tp5704 (Kohler)Service manual — 194-208 Ford LSG875 460CID Engine Service manual Apr1992 (Power Products)Service manual — 928-0612 Onan GGHB GGHC GGHD InstallationManual (11-1998) (Cummins/Onan)Service manual — TP-6356 (Kohler)Service manual — sb575Service manual — tp5149 (Kohler)Service manual — tp6356 (Kohler)
This page was generated from the 12 manufacturer documents above by automated extraction; every figure shown is copied from one of them. How the data is compiled.