Specifications
| Fuel | Diesel |
|---|---|
| Frequency | 60.0 Hz |
| Standby power | 70 kW |
| Standby kVA | 87 |
| Oil capacity | 10.8 L |
| Alternator | YHB (2-pole) |
| Phase | 3 |
| Power factor | 0.8 |
| Battery group | 31 |
| Battery cranking | 625 CCA |
| Battery voltage | 12 V |
| Battery quantity | 1 |
| Coolant capacity | 20.6 L |
Engine
| Oil capacity | 10.8 L |
|---|---|
| Coolant capacity | 20.6 L |
| Aspiration | turbocharged |
| Rated speed | 1800 rpm |
Maintenance & consumables
for the Cummins/Onan L634T| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | clean/replace based on air restriction gauge (DL4B/DL6B) or visual inspection (DL6TB) | — | 400 hr | ||
| Fuel filter | — | 400 hr | |||
| Oil filter | — | 200 hr | |||
| Battery | 12 volt, Group 31; check specific gravity 1.260 fully charged | — | 50 hr | ||
| Belt | tension 60 lbs (267 N) | — | 50 hr | ||
| Coolant | 50/50 ethylene glycol antifreeze and clean, low-mineral water | — | |||
| Oil | SAE 15W-40/30W/20/20W-20/10W (API CD/SF, CD/SE, or MIL-L-2104C); or synthetic 5W-20/5W-30 (MIL-L-46167, MIL-L-2104C, or MIL-L-46152B) | — | 200 hr |
Service intervals
16| Item | Action | Hours | Months | Notes |
|---|---|---|---|---|
| Coolant Level | Check | 50 hr | ||
| Crankcase Oil and Filter | Change | 200 hr | First service — Perform after first 50 hours on new sets | |
| Fan Belt | Check | 50 hr | ||
| Generator Set | Inspect | 50 hr | With engine running, visually/audibly check exhaust for leaks | |
| Oil Level | Check | 50 hr | ||
| Valve Lash Clearance | Check | 400 hr | First service — Perform after first 50 hours on new sets; refer to L-Series Engine Service Manual | |
| Air Cleaner | Check | 100 hr | Perform more often under extremely dusty/dirty conditions | |
| Exhaust Condensate Trap | Drain | 100 hr | ||
| Fuel Level | Check | 100 hr | ||
| Battery Condition | Check | 200 hr | ||
| Electrolyte Level | Check | 200 hr | ||
| Generator Assembly | Clean | 200 hr | ||
| Air Cleaner Element | Change | 400 hr | ||
| Crankcase Breather Cap (DL6TB) | Clean | 400 hr | ||
| Fuel Filter | Change | 400 hr | 12 mo | Whichever comes first |
| Generator Bearing | Inspect | 500 hr | Replace every five years |
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 |
|---|---|---|---|---|
| Gap | Overspeed switch magnetic air gap | 0.005 | inch (0.13 mm) | must not be less than |
| Gap | Overspeed switch magnetic air gap | 0.005 inch (0.13 mm) minimum | inch | |
| Other | Battery electrolyte specific gravity | 1.260 | specific gravity | fully charged battery at 80F (27C) |
| Other | Battery electrolyte specific gravity (fully charged) | about 1.260 | specific gravity | at 80 deg F (27 deg C) |
| Other | Control breaker rating | 7 | amperes | |
| Other | Field breaker rating | 5 | amperes | |
| Other | Low Oil Pressure Delay before shutdown/pre-alarm | 7.5 to 12.5 | seconds | after Start-Disconnect Relay energized |
| Other | Low oil pressure delay circuit | 7.5 to 12.5 | seconds | after start-disconnect relay energized |
| Other | Maximum allowable exhaust back pressure | 41 | inches (1041 mm) H2O | |
| Other | Oil pressure gauge range | 0 to 100 psi (0 to 700 kPa) | psi | |
| Other | Overcranking timer cranking limit | 45 to 75 | seconds | |
| Other | Overcranking timer limit | 45 to 75 | seconds | |
| Other | Remote breaker rating | 7 | amperes | |
| Other | Switching regulator (standard setting) nominal switching frequency | approximately 125 | Hz | |
| Other | Water temperature gauge range | 100 to 250F (40 to 121C) | F | |
| Pressure | Air cleaner cleaning air pressure | 35 | psi (241 kPa) | |
| Pressure | Air cleaner rinse water pressure maximum | 40 | psi (276 kPa) | |
| Pressure | Low oil pressure shutdown (LO OIL PRES) | 14 | psi (97 kPa) | |
| Pressure | Low oil pressure switch closes | 14 | psi (97 kPa) | |
| Pressure | Low oil pressure switch closes | 14 psi (97 kPa) | psi | |
| Pressure | Oil pressure gauge normal range | 30 to 55 | psi (207 to 380 kPa) | operating temperature |
| Pressure | Oil pressure gauge range | 0 to 100 | psi (0 to 700 kPa) | |
| Pressure | Pre-low oil pressure switch closes | 20 | psi (138 kPa) | |
| Pressure | Pre-low oil pressure switch closes | 20 psi (138 kPa) | psi | |
| Pressure | Pre-low oil pressure warning | 20 | psi (138 kPa) | |
| Resistance | Commutating reactor L21 coils 1-2 | 0.031 to 0.37 | ohms | at 77 deg F (25 deg C) |
| Resistance | Commutating reactor L21 coils 3-4 | 0.037 to 0.46 | ohms | at 77 deg F (25 deg C) |
| Resistance | Commutating reactor L21/L22 coil 1-2 resistance | .031 to 0.37 | ohms | at 77F (25C) |
| Resistance | Commutating reactor L21/L22 coil 3-4 resistance | 0.037 to 0.46 | ohms | at 77F (25C) |
| Resistance | Commutating reactor coil to frame | infinity | ohms | |
| Resistance | Exciter rotor leads T1-T2, T2-T3, T1-T3 resistance | 0.6 to 0.7 | ohms | at 68F (20C) |
| Resistance | Exciter rotor winding between lead pairs T1-T2, T2-T3, T1-T3 | 0.6 to 0.7 | ohms | at 68 deg F (20 deg C) |
| Resistance | Exciter stator / rotor / generator winding insulation to ground | 1 megohm (1,000,000 ohms) or greater | ohms | minimum |
| Resistance | Exciter stator field leads F1-F2 resistance | 13.05 to 15.95 | ohms | at 77F (25C) |
| Resistance | Exciter stator winding between F1+ and F2- | 13.05 to 15.95 | ohms | at 77 deg F (25 deg C) |
| Resistance | Generator rotor field leads F1-F2 resistance (60 Hz) | 2.9 | ohms | at 77F (25C) |
| Resistance | Generator rotor field leads F1-F2 resistance (60 Hz) | 3.1 | ohms | at 77F (25C) |
| Resistance | Reference transformer T21 primary coil resistance | 333-407 | ohms | |
| Resistance | Reference transformer T21 primary coil resistance | 350-427 | ohms | |
| Resistance | Reference transformer T21 primary coil resistance | 531-649 | ohms | |
| Resistance | Stator resistance Code 15R (60 Hz) | 33.5 | milliohms | Test between T1-LO, T2-LO, T3-LO at 77F (25C) |
| Resistance | Stator resistance Code 15R (60 Hz) | 39.4 | milliohms | Test between T1-LO, T2-LO, T3-LO at 77F (25C) |
| Resistance | Stator resistance Code 15R (60 Hz) | 9.8 | milliohms | Test between T1-LO, T2-LO, T3-LO at 77F (25C) |
| Resistance | Stator resistance Code 515R (50 Hz) | 46.5 | milliohms | at 77F (25C) |
| Resistance | Voltage reference transformer T21 primary winding (H leads) | 350-427 / 333-407 / 303-371 / 282-344 / 531-649 | ohms | |
| Speed | Engine rated speed (per flow charts) | 1800 | rpm | |
| Speed | Frequency-to-speed conversion | 1 | hertz = 30 r/min | |
| Speed | Nominal switching frequency (switching regulator) | 125 | Hz | approximately |
| Speed | Overspeed switch contact closure | 2200 to 2250 | rpm | |
| Speed | Overspeed switch contacts close | 3950 to 4050 | rpm | |
| Temperature | High engine temperature shutdown | 220 | F (104 C) | |
| Temperature | High engine temperature switch closes | 222 | deg F (106 deg C) | |
| Temperature | High engine temperature switch closes | 222F (106C) | F | |
| Temperature | Low engine temperature switch closes | 70F (21C) | F | coolant drops below |
| Temperature | Low engine temperature switch closes below | 70 | deg F (21 deg C) | |
| Temperature | Low engine temperature warning (LO ENG TEMP) | 70 | F (21 C) | engine block temperature |
| Temperature | Oil temperature gauge range | 150 to 300 | deg F (66 to 149 deg C) | |
| Temperature | Pre-high engine temperature switch closes | 216 | deg F (102 deg C) | nominal |
| Temperature | Pre-high engine temperature switch closes | 216F (102C) | F | nominal |
| Temperature | Pre-high engine temperature warning | 215 | F (102 C) |
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 | Ethylene glycol anti-freeze (permanent type) with rust/corrosion inhibitor, no stop-leak additive | Use at least 50/50 mixture of anti-freeze and clean, soft water | |||
| Engine oil | 15W-40, 30W, 20, 20W-20, 10W (API CD/SF, CD/SE, or MIL-L-2104C); synthetic 5W-20 or 5W-30 (MIL-L-46167, MIL-L-2104C, MIL-L-46152B) | API CD/SF, CD/SE, MIL-L-2104C | Mineral base 5W-20/5W-30 not recommended under any conditions; select grade for lowest expected temperature | ||
| Fuel | ASTM 2-D (No. 2 Diesel) or ASTM 1-D (No. 1 Diesel), Cetane 45 minimum | ASTM 2-D / ASTM 1-D | Use No. 1 diesel below 0C (32F) and during long light-load periods; cloud point at least 10 degrees below lowest expected fuel temperature | ||
| Grease | MolyKote grease or equivalent | Apply thin film to mating surfaces of end bearing and end bell bearing hole | |||
| Grease | Molykote grease or equivalent | Apply a thin film to the mating surfaces of the end bearing and the end bell bearing hole. | |||
| Other | Approved water for battery electrolyte | Add approved water to keep battery electrolyte at proper level. |
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
8| Code | Name | Meaning | Severity | Action |
|---|---|---|---|---|
| HI ENG TEMP | High Engine Temperature | Engine overheated above 220F (104C) or low coolant | Shutdown | Check coolant level, airflow, fan belt |
| LO ENG TEMP | Low Engine Temperature | Engine block temperature below 70F (21C) | Info | Wait for block temperature to rise |
| LO OIL PRES | Low Oil Pressure | Oil pressure dropped to 14 psi (97 kPa) | Shutdown | Check oil level, reset control |
| OVERCRANK | Overcrank | Engine failed to start after 45-75 seconds cranking | Shutdown | Check fuel system |
| OVERSPEED | Overspeed | Engine exceeded normal operating speed | Shutdown | Contact Onan Dealer or Distributor |
| PRE HI ENG TEMP | Pre-High Engine Temperature | Engine temperature approximately 215F (102C) | Warning | Check ventilation, reduce load |
| PRE LO OIL PRES | Pre-Low Oil Pressure | Oil pressure dropped to 20 psi (138 kPa) | Warning | Check oil level |
| SWITCH OFF | Switch Off | Start/Stop/Remote switch in Stop position | Info | Move switch to Remote for automatic starting |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
Procedures
12Changing Sensitivity Reference adjustment
⚠ Do not mark on printed circuit boards with a pencil; graphite lines are conductive.
Tools: soldering iron
- Unsolder W1 on VR21 at hole F for frequency sensitive.
- Resolder W1 to hole S for semi-frequency sensitive.
- Resolder W1 to hole N for non-frequency sensitive.
Fan Belt Adjustment adjustment
Tools: belt adjustment tool
- Loosen alternator bolt through elongated slot in mounting bracket
- Slide alternator until fan belt tension of 60 lbs (267 N) is obtained
- Tighten alternator mounting bolt to lock in place
- Check tension and repeat if necessary
Governor Control Adjustment adjustment
⚠ Hold the throttle linkage so that the set will not overspeed.
Tools: frequency meter
- Place Start/Stop/Remote switch in STOP.
- Attach frequency meter to generator output leads if none on panel.
- Locate governor control in control box.
- Adjust GAIN potentiometer fully counterclockwise.
- Hold throttle linkage to prevent overspeed; start the set.
- Adjust SPEED potentiometer to correct frequency (50 or 60 hertz).
- Adjust GAIN clockwise until governor hunts, then counterclockwise until stable.
- Test by tapping actuator lever; set should return to speed without hunting.
- Stop and restart set to verify it does not overspeed.
Magnetic Pickup Sensor Adjustment adjustment
- Place Start/Stop/Remote switch in the STOP position.
- Loosen stop-nut on the magnetic sensor on the flywheel housing.
- Turn sensor IN until it just contacts flywheel ring gear.
- Back sensor OUT 1/2 turn and tighten stop-nut.
Reconnection (Test Q) adjustment
- Refer to the generator reconnection possibilities when changing voltage.
- Reconnect lead W12 (inside control box) to the proper H terminal (H2, H3, H4, H5, or H6) depending on voltage selected.
- Change jumper W12 from TB2-2 to the proper TB2 terminal.
Voltage Adjustment (Standard Regulator) adjustment
- Center the panel mounted voltage adjustment knob with pointer vertical.
- Start the set and allow it to stabilize at correct frequency and speed.
- Turn R18 counterclockwise to decrease voltage or clockwise to increase.
- Set voltage with no load connected (e.g., 246 volts for 120/240).
- Turn R26 counterclockwise until unstable, then clockwise until voltage stabilizes.
Voltage Adjustment (Test P) adjustment
Tools: voltmeter
- Center the panel-mounted voltage adjustment knob vertically.
- Start the set and allow it to stabilize at the correct frequency and speed.
- Standard regulator: turn R18 counterclockwise to decrease voltage, clockwise to increase; set no-load voltage (e.g. 246 volts for 120/240 connection).
- Standard regulator: turn R26 counterclockwise until voltage hunts, then clockwise until stable.
- Switching regulator: turn R36 counterclockwise to increase voltage, clockwise to decrease; set no-load voltage.
- Switching regulator: turn R5 counterclockwise until voltage hunts, then clockwise until stable.
Alternator Checkout diagnostic
Tools: voltmeter
- With engine running, check battery charge rate DC ammeter.
- Ammeter should show slight charge tapering to zero as battery becomes charged.
- If constant discharge or high charge, stop set and check drive belt, terminals, leads.
- Measure alternator output voltage: positive lead to output terminal, negative to ground.
- Nominal output voltage should be 13.8 to 14.8 volts.
- If over 15 volts, check voltage regulator leads; replace regulator if shorted.
Alternator Checkout (C) diagnostic
Tools: DC ammeter, voltmeter
- With engine running, check the battery charge rate DC ammeter; it should show a slight charge tapering to zero.
- If constant discharge or constant high charge, stop set and check drive belt, terminal connections, and lead wires.
- Use a voltmeter between output terminal and ground; nominal output should be 13.8 to 14.8 volts.
- If output high (over 15 volts), check for loose or corroded voltage regulator leads; replace regulator if shorted.
- If output low, problem could be worn/broken brushes, open regulator, or open field diode.
Battery Cable Checkout (B) diagnostic
Tools: voltmeter
- With the starter motor operating, check voltage drop from battery negative post to cylinder block.
- Check voltage drop from battery positive post to battery terminal stud on the solenoid.
- Normally each should be less than 0.3 volt.
- Clean all connections in any part of the circuit showing excessive voltage drop.
Fuel Solenoid Checkout diagnostic
- Listen for a click in the injection pump when start switch is placed in run position.
- If no click is heard and there is power to solenoid, replace the fuel solenoid.
Fuel Solenoid Checkout (F) diagnostic
- To check energized-to-run operation, listen for a click in injection pump when start switch is placed in run position.
- If no click and there is power to solenoid, the fuel solenoid must be replaced.
- To check energized-to-stop operation, listen for a click when switch is placed in stop position.
- If no click and there is no power to solenoid, the fuel solenoid must be replaced.
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 |
|---|---|---|---|---|
| Connect loose wire W12 from TB2-2 to TB2 (H terminal) | H2, H3, H4, H5 or H6 depending on voltage selected | W12 reconnection lead inside control box; must be reconnected to proper H terminal when reconnecting for a different voltage | ||
| X1 (red) to VR21-9, X2 (red) to VR21-10 | X1, X2 | Reference transformer T21 secondary connections | ||
| 110/190 | 3 | Figure 26 generator voltage connections | ||
| 110/220 | 1 | Connect lead W12 to H6 (per Figure 26 reconnection table) | 50 Hz. Figure 26 generator voltage connections. OCR partially garbled. | |
| 115/200 | 3 | Figure 26 generator voltage connections | ||
| 115/230 | 1 | Connect lead W12 to H6 (per Figure 26 reconnection table) | 50 Hz. Figure 26 generator voltage connections. OCR partially garbled. | |
| 120/208 | 3 | Figure 26 generator voltage connections | ||
| 120/240 | 1 | Connect lead W12 to H5 (per Figure 26 reconnection table) | 60 Hz. Figure 26 generator voltage connections. OCR partially garbled. | |
| 120/240 | 1 | Reconnectible generator (code 15/515) | W12 (TB2) to H3/H4/H5/H6 on voltage reference transformer | 12-lead generator reconnection |
| 127/220 | 3 | Figure 26 generator voltage connections | ||
| 130/400 | 3 | Figure 26 generator voltage connections | ||
| 139/240 | 3 | Figure 26 generator voltage connections | ||
| 220/380 | 3 | Figure 26 generator voltage connections | ||
| 220/380 | 3 | Non-reconnectible (code 7) | H3 | |
| 240/416 | 3 | Figure 26 generator voltage connections | ||
| 254/440 | 3 | Figure 26 generator voltage connections | ||
| 277/480 | 3 | Figure 26 generator voltage connections | ||
| 347/600 | 3 | Non-reconnectible (code 9X) | H5 | |
| Various | Reconnect lead W12 (inside control box) from TB2-2 to the proper H terminal (H2, H3, H4, H5, or H6) depending on voltage selected | W12, H2, H3, H4, H5, H6 | Figure 25. Single phase generators use leads 1 and 4 (lead 2 not used); three phase generators use leads 4, 7, 8, 9 and 10 for control input and metering. |
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 Cummins/Onan DL6T?
The Cummins/Onan DL6T is rated 70 kW standby (87.5 kVA).
What engine does the Cummins/Onan DL6T use?
The Cummins/Onan DL6T is powered by the Cummins/Onan L634T engine.
Is the Cummins/Onan DL6T diesel or gas?
The Cummins/Onan DL6T runs on Diesel.
How much oil does the Cummins/Onan DL6T take?
The Cummins/Onan L634T engine in the Cummins/Onan DL6T has an oil capacity of 10.8 liters.
What is the cooling system capacity of the Cummins/Onan DL6T?
The Cummins/Onan DL6T cooling system holds 20.6 liters (5.4 US gallons) for the radiator system including the engine, per the manufacturer specification sheet.
What size battery does the Cummins/Onan DL6T need?
The Cummins/Onan DL6T uses 1 battery, 12 V each, 625 CCA, group 31, per the manufacturer specification sheet.
Which alternator is fitted to the Cummins/Onan DL6T?
The Cummins/Onan DL6T uses a YHB alternator. It has 2 poles.
Troubleshooting
18Symptoms & remedies
| Symptom | Cause | Remedy |
|---|---|---|
| Engine does not start after 30 seconds of cranking | Place the Start/Stop/Remote switch in the Stop position; wait two minutes and then repeat steps 1 and 2 | |
| Engine does not start after second starting attempt | No fuel delivery (absence of blue/white exhaust smoke during cranking indicates no fuel delivery) | Check fuel supply |
| Green RUN lamp lights following engine start-up | Indicates all engine systems are normal | No corrective action required |
| PRE HI ENG TEMP lamp lights. Engine continues to operate | Indicates engine has begun to overheat and engine temperature has risen to approximately 215°F (102°C) | If engine can be stopped, follow procedures in step 3; if generator is powering critical loads and cannot be shutdown: check air inlets and outlets and remove any obstructions to airflow; open doors or windows in generator area to increase ventilation; reduce load if possible by turning off non-critical loads |
| HI ENG TEMP lamp lights. Engine shuts down | Indicates engine has overheated (engine temperature has risen above 220°F/104°C) or coolant level is low (sets with coolant level sensor) | Allow engine to cool down completely before proceeding with the following checks: check coolant level and replenish if low, look for possible coolant leakage points and repair if necessary; check for obstructions to cooling airflow and correct as necessary; check for a slipping fan belt and tighten if loose; reset control and restart after locating and correcting problem; contact an Onan Dealer or Distributor if none of the above |
| PRELO OIL PRES lamp lights. Engine continues to operate | Indicates engine oil pressure has dropped to 20 psi (138 kPa) | If engine can be stopped, follow procedures in step 5; if generator is powering critical loads and cannot be shut down, wait until next shutdown period and then follow step 5 procedure |
| LO OIL PRES lamp lights. Engine shuts down | Indicates engine oil pressure has dropped to 14 psi (97 kPa) | Check oil level and replenish if low; reset control and restart; contact an Onan Dealer or Distributor if oil pressure is not in the range of 30 to 55 psi (207 to 380 kPa) |
| OVERCRANK lamp lights and engine stops cranking after 45 to 75 seconds | Indicates possible fuel system problem | When the engine has cooled, make the following checks: check for empty fuel tank, fuel leaks, or plugged fuel lines and correct as required; check for dirty fuel filter and replace if necessary (see MAINTENANCE section); check for dirty or plugged air filter and replace if necessary (see MAINTENANCE section); reset the control and restart after correcting the problem; contact an Onan Dealer or Distributor for service if none of the above |
| Engine runs and then shuts down. OVERSPEED lamp lights | Indicates engine has exceeded normal operating speed | Contact an Onan Dealer or Distributor for service |
| SWITCH OFF lamp flashes | Indicates Start/Stop/Remote switch is in the Stop position which will prevent automatic starting if an automatic transfer switch is used | Move the Start/Stop/Remote switch to the Remote position for automatic starting |
| Fault lamp lights but no fault exists. Engine gauges show oil pressure, engine temperature, and frequency (speed) are within normal limits | The monitor board or a sensor may be at fault | Reset control; if control will not reset, contact an Onan Dealer or Distributor for service |
| Engine starts from generator control panel but won't start automatically or from a remote panel (Note: The Start/Stop/Remote switch must be in the Remote position for automatic or remote starting) | Remote circuit breaker is tripped | Reset breaker and restart; contact an Onan Dealer or Distributor if breaker trips after resetting |
| Engine will not crank | Indicates possible fault with control or starting system; fault lamp on | Correct fault and reset control |
| Engine will not crank | Control circuit breaker is tripped | Reset breaker and restart; contact an Onan Dealer or Distributor if breaker trips again after resetting |
| Engine will not crank | Poor battery cable connections | Clean the battery terminals and tighten all connections |
| Engine will not crank | Discharged or defective battery | Recharge or replace the battery |
| No AC output voltage | Field breaker is tripped | Reset breaker; contact an Onan Dealer or Distributor if voltage build up causes breaker to trip |
| LO ENG TEMP lamp lights. Generator set is in Standby mode or was just started | Indicates engine block temperature has dropped below 70°F (21°C) | Lamp will go out when block temperature rises |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing.
Repair guides
27- Alternator Checkout
- Alternator Checkout (C)
- Battery Cable Checkout (B)
- Battery Checkout (A)
- Changing Sensitivity Reference
- Cleaning Crankcase Breather (Turbocharged Engines)
- Flashing the Field (Test D)
- Fuel Solenoid Checkout (F)
- Generator Assembly
- Generator Reassembly
- Governor Control Adjustment
- Magnetic Pickup Sensor Adjustment
- Priming the Fuel System - High Pressure
- Priming the Fuel System - Low Pressure
- Reconnection (Test Q)
- Relay Checkout (E)
- Solenoid Checkout (D)
- Switch Checkout
- Switch Checkout (G)
- Testing Commutating Reactors (L21 and L22)
Step-by-step procedures compiled from the Cummins/Onan service manual for this model.
Parts
73| Part # | Description | Qty | System | |
|---|---|---|---|---|
| 140-1791 | Indicator Service | 1 | Sensor | Amazon eBay |
| 151-0437 | Kit, Throttle Modification (Fuel Injection Pump) | 1 | Fuel pump | Amazon eBay |
| 193-0244 | Sender, Oil Pressure (E1) | 1 | Sensor | Amazon eBay |
| 309-0169 | Switch, Low Oil Pressure | 1 | Sensor | Amazon eBay |
| 415-0467 | Gasket - Access Plate | 1 | Gasket | Amazon eBay |
| 503-0354 | Clamp, Hose | 4 | Hose | Amazon eBay |
| 503-0465 | Clamp, Hose | 4 | Hose | Amazon eBay $23.99 |
| 503-0482 | Hose, Rubber | 1 | Hose | Amazon eBay |
| 110-3731 | Short block | 1 | Service part / kit | eBay |
| 140-0078 | Band, Mount ing | 2 | Service part / kit | Amazon eBay NAPA $33.55 |
| 140-1844 | DGAB. DL4, A41 | 1 | Service part / kit | Amazon eBay |
| 140-1845 | DGAC. DGAD. DL6. A61 | 11 | Service part / kit | Amazon eBay |
| 140-1851 | Element | 1 | Service part / kit | Amazon eBay $50.00 NAPA $51.90 |
| 140-1864 | Elbow, Rubber | 1 | Service part / kit | Amazon eBay NAPA $28.15 |
| 140-1871 | Tube, Air Inlet | 1 | Service part / kit | Amazon eBay |
| 150-0939 | Joint, Ball | 2 | Service part / kit | Amazon eBay |
| 150-1446 | Bracket and Point Assembly [Includes Parts Marked #) | 1 | Service part / kit | eBay |
| 150-1996 | Bracket, Mounting | 1 | Service part / kit | Amazon eBay |
| 151-0565 | Control Unit, Governor -12 VDC (A12) | 1 | Service part / kit | Amazon eBay |
| 151-0566 | Actuator, Governor | 1 | Service part / kit | Amazon eBay |
| 151-0567 | Arm, Governor (Includes Screw and Nut) | 1 | Service part / kit | Amazon eBay |
| 155-2053 | Shield. Heat - DGAE: DL6T. AT61 | 1 | Service part / kit | eBay |
| 159-0007 | Cap - Fuel Tank | 1 | Service part / kit | Amazon eBay |
| 159-1120 | Bracket Mounting- Fuei Tank | 1 | Service part / kit | eBay |
| 159-1122 | Plate. Support - Fuel Tank | 1 | Service part / kit | eBay |
| 191-0943 | Fan. Atlernator | 1 | Service part / kit | Amazon eBay |
| 191-1452 | Used on early Spec C Models with isolation Diode Assembly | 1 | Service part / kit | Amazon eBay |
| 191-1453 | Spec C Used on Early Spec C Model with Isolation Diode Assembly | 1 | Service part / kit | Amazon eBay |
| 191-1454 | Diode Assembly. Isolation- Used on Early Spec C Models Diode, Rectifier - Negative | 1 | Service part / kit | Amazon eBay |
| 191-1525 | Alternator (Complete) Used Beginning on Late Spec C Models- Has No Isolation Diodes on Back Side of Alternator (Replaces Early Spec C Models with Isolation Diode Assembly on Back Side of Alternator) | 1 | Service part / kit | Amazon eBay |
| 191-1559 | Used on Late Spec C Models without Isolation | 1 | Service part / kit | Amazon eBay |
| 191-1560 | Used on Late Spec C Modeis without Isolation Diode Assembly | 1 | Service part / kit | Amazon eBay |
| 402-0078 | Mount, Vibration | 4 | Service part / kit | Amazon eBay |
| 403-2063 | DGAB | 1 | Service part / kit | eBay |
| 403-2064 | DGAC. DGAD. DGAE | 1 | Service part / kit | eBay |
| 405-2677 | Cover, Control | 1 | Service part / kit | eBay |
| 405-3082 | Grille | 1 | Service part / kit | eBay |
| 405-3867 | Bracket, Hasp | 8 | Service part / kit | eBay |
| 406-0105 | Hasp,Door | 8 | Service part / kit | eBay |
| 406-0491 | 5 Feet Required | 1 | Service part / kit | eBay |
| 406-0561 | Panel, Rear | 4 | Service part / kit | eBay |
| 415-0451 | Strap. Retaining - Tank Tank, Fuel- Day (Includes | 1 | Service part / kit | eBay |
| 415-0543 | Cap) (3-1/2 Gallons) | 1 | Service part / kit | eBay |
| 503-1222 | Elbow, 90 Tube, Intake | 2 | Service part / kit | Amazon eBay |
| 505-0001 | Cap, Pipe (1/8") | 1 | Service part / kit | Amazon eBay NAPA $63.90 |
| 526-0003 | #Washer, Flat (#8) | 12 | Service part / kit | Amazon eBay |
| 55432 | 73RD AVENUE NE * MINNEAPOLIS. MINNESOTA | 1400 | Service part / kit | Amazon eBay |
| 718-1067 | Screw. Hex Head | 1 | Service part / kit | Amazon eBay |
| 800-0006 | Screw, Cap - Hex Head (1/4-20 × 7/8") | 4 | Service part / kit | Amazon eBay |
| 800-0090 | Screw, Cap - Hex Head (1/2-13 × 1") | 1 | Service part / kit | Amazon eBay |
| 800-2057 | Screw, Cap - Hex Head | 1 | Service part / kit | Amazon eBay |
| 812-0061 | Screw, Machine - Round Head (#6-32 X 3/8') | 2 | Service part / kit | Amazon eBay |
| 813-0098 | Plug, Keying - PC Board Screw, Machine - Round Head | 1 | Service part / kit | Amazon eBay |
| 813-0100 | Screw, Machine-Round Head (#10-32 × 1/2") | 16 | Service part / kit | Amazon eBay |
| 818-0150 | Rivet | 12 | Service part / kit | Amazon eBay |
| 821-0010 | Screw, Self -1ocking - Hex Washer Head (1/4-20 x 1/2') | 1 | Service part / kit | Amazon eBay |
| 821-0014 | 2 821-0018 1 3 526-0018 2 4 856-0006 1 5 870-0212 1 6 NOTE 1 REF 7 NOTE 1 REF 8 NOTE 1 | 1 | Service part / kit | Amazon eBay |
| 821-0015 | Screw, Self-locking - Hex Washer Head (1/4-20 x 3/4') | 16 | Service part / kit | Amazon eBay |
| 821-0018 | Screw, Self-locking - Hex Washer Head ( 1'4.20 x 5 8') | 1 | Service part / kit | Amazon eBay |
| 850-0030 | Washer, Lock - Spring (#10) | 1 | Service part / kit | Amazon eBay |
| 850-0040 | Washer, Lock - Spring (1/4") | 2 | Service part / kit | Amazon eBay |
| 850-0045 | Washer, Lock - Spring (5/16') | 2 | Service part / kit | Amazon eBay $7.00 |
| 850-0060 | Screw, Cap - Hex Head (5/16-18 X 7-1/2" ) | 4 | Service part / kit | Amazon eBay |
| 853-0013 | Washer, Lock - ET (1/4') | 1 | Service part / kit | Amazon eBay |
| 862-0001 | Nut, Hex (1/4-20) | 2 | Service part / kit | Amazon eBay $19.72 |
| 862-0016 | Nut, Hex | 6 | Service part / kit | Amazon eBay |
| 870-0131 | Nut. Hex - with ET (#10-32) | 1 | Service part / kit | Amazon eBay |
| 870-0212 | Nut, Locking (1/4-20) | 2 | Service part / kit | Amazon eBay |
| 870-0250 | #Washer, Lock - ET | 1 | Service part / kit | Amazon eBay |
| 870-0258 | Nut. Weld (1/4-20) | 6 | Service part / kit | eBay |
| 870-1183 | Nut, ET (6-32) | 8 | Service part / kit | Amazon eBay |
| 895-0195 | Stripping. Weather - Bulk (Order by the Foot) | 1 | Service part / kit | eBay |
| 934-0121 | SPEC A | Service part / kit | 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.
Available documents
Operator's manual — 934-0121 Onan DL4B DL6B DL6TB Operator's Manual (8-1964) (Onan)Parts manual — 0932-0112 Onan Post-Sale Literature Index (07-1998) (Cummins/Onan)Parts manual — 934-0226 Onan DL6T Parts Manual (3-1988) (Cummins/Onan)Service manual — 900-0336 Onan DL4 DL6 DL6T Genset Generator & Controls Service manual (08-1983) (Onan)Service manual — 900-0339 Onan DL4B DL6B DL6TB YHB Generator Controls manual 11-1984 (Onan)
This page was generated from the 5 manufacturer documents above by automated extraction; every figure shown is copied from one of them. How the data is compiled.