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Cummins/Onan KTTA19-G2 Engine

The Cummins/Onan KTTA19-G2 is a 19 L 6-cylinder turbocharged engine rated at 1500 rpm. It powers generator sets from Cummins/Onan, including the 500 DFFB, DBFB, DMEB and DMFB. It holds 45 L (11.9 gal) of oil and 91 L (24.0 gal) of coolant.

Also known as: Cummins KTTA19-G2

Part of the Cummins/Onan KTTA19 engine family — 3 variants share parts & fitment.

19.0 L

Displacement

Cylinders

1500 rpm

Rated speed

45.0 L

Oil capacity

On this pageSpecs Generator sets FAQ Service intervals Torque & specs Fluids Fault codes Procedures Wiring

Engine specifications

Oil capacity	45.0 L
Coolant capacity	91.0 L
Displacement	19.0 L
Cylinders	6
Aspiration	Turbocharged
Rated speed	1500 rpm

Generator sets powered by this engine

Cummins/Onan 500 DFFBCummins/Onan DBFBCummins/Onan DMEBCummins/Onan DMFB

How to read your Cummins/Onan engine serial & model number →

Common problems

The FAULT 1 or FAULT 2 fault lamp lights. Engine shuts down immediately, engine runs for several seconds and then shuts down, or engine continues to run FAULT 1
Cause: The standard undesignated fault functions are programmed to shut down the set when a fault is sensed. Fault 1 is timed delayed while Fault 2 is immediate. The nature of the fault is an optional selection that is determined when the set installation is designed. The undesignated fault functions may also be programmed for non-shutdown or non-time delay.
SWITCH OFF lamp flashes
Cause: Indicates Run-Stop-Remote switch is in the Stop position which will prevent automatic starting
Fix: Moving the Run-Stop-Remote switch to the Remote position will stop the lamp flashing and enable automatic starting.
PRELO OIL PRES lamp lights. Engine continues to operate. PRELO OIL PRES
Fix: Indicates engine oil pressure has dropped to 20 psi (138 kPa). If generator is powering critical loads and cannot be shut down, wait until next shutdown period and then follow step 5 procedure. If engine can be stopped, follow procedure in step 5.
PRELO OIL PRES lamp lights. Engine continues to operate
Cause: Indicates engine oil pressure has dropped to 20 psi (138 kPa)
Fix: If generator is powering critical loads and cannot be shut down, wait until next shutdown period and then follow step 5 procedure. If engine can be stopped, follow procedure in step 5.
PRE HI ENGINE TEMP lamp lights. Engine continues to operate. PRE HI ENGINE TEMP
Fix: Indicates engine has begun to overheat and engine temperature has risen to approximately 205° F (97°C). If generator is powering non-critical and critical loads, and cannot be shut down, use the following: a. Reduce load if possible by turning off non-Critical loads. b. Check air inlets and outlets and remove any obstructions to airflow. c. Open doors or windows in generator area to increase ventilation. If engine can be stopped, follow procedure in step 3.
PRE HI ENGINE TEMP lamp lights. Engine continues to operate
Cause: Indicates engine has begun to overheat and engine temperature has risen to approximately 205° F (97°C)
Fix: If generator is powering non-critical and critical loads, and cannot be shut down, use the following: Reduce load if possible by turning off non-critical loads; Check air inlets and outlets and remove any obstructions to airflow; Open doors or windows in generator area to increase ventilation. If engine can be stopped, follow procedure in step 3.
OVERCRANK lamp lights and engine stops cranking. Or. Engine runs, shuts down, and LO OIL PRES lamp lights
Cause: Indicates possible fuel system problem
Fix: 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); Refer to step 5; Reset the control and restart after correcting the problem. Contact your distributor for service if none of the above applies.
No AC output voltage. (Note: If unit is equipped with an excitation breaker (located on back side of output box, near regulator box), confirm it is at ON position.)
Cause: Voltage regulator is inoperative
Fix: Refer to Initial Start and Checks, and Adjustments sections of your Installation Manual for voltage check and adjustment procedures. Contact your distributor if voltage build-up is still a problem.
LO OIL PRES lamp lights. Engine shuts down. LO OIL PRES
Fix: Indicates engine oil pressure has dropped to 14 psi (97 kPa). Check oil level, replenish as necessary. Check oil lines and filters for leaks, repair as required. Reset control and restart. Contact your distributor if oil pressure is not in the range of 50 to 70 psi (345 to 483 kPa).
LO OIL PRES lamp lights. Engine shuts down
Cause: Indicates engine oil pressure has dropped to 14 psi (97 kPa)
Fix: Check oil level, replenish as necessary. Check oil lines and filters for leaks, repair as required. Reset control and restart. Contact your distributor if oil pressure is not in the range of 50 to 70 psi (345 to 483 kPa).
LO FUEL lamp lights. Engine shuts down and LO OIL PRES lamp lights. LO FUEL
Fix: Indicates engine has run out of fuel. Check fuel level and replenish as required.
LO FUEL lamp lights. Engine shuts down and LO OIL PRES lamp lights
Cause: Indicates engine has run out of fuel
Fix: Check fuel level and replenish as required.
LO FUEL lamp lights. Engine continues to run. LO FUEL
Fix: Indicates diesel fuel supply is running low. Check fuel supply and replenish as required.
LO FUEL lamp lights. Engine continues to run
Cause: Indicates diesel fuel supply is running low
Fix: Check fuel supply and replenish as required.
LO ENG TEMP lamp lights. Set is in standby mode but is not operating. (Lamp lights when engine coolant temperature is 70° F (21° C) or lower. Since the lamp goes out after the engine warms up, there should be no cause for alarm if it remains lighted during initial generator set operation.)
Cause: Indicates engine coolant heater is not operating or is not circulating coolant
Fix: Check for the following conditions: Coolant heater not connected to power supply. Check for blown fuse or disconnected heater cord and correct as required; Check for low coolant level and replenish if required. Look for possible coolant leakage points and repair as required; Contact your distributor if none of the above applies.

Compiled from service & troubleshooting documentation across every generator set that uses the Cummins/Onan KTTA19-G2.

Service intervals

Item	Action	Hours	Months	Notes
crankcase oil	Change	50 hr		First service — Drain and replace the crankcase oil after the first 50 hours of operation on new generator sets; make a special entry in unit log book

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

Type	Item	Value	Unit	Condition
Clearance	Exhaust pipe clearance to combustible materials	12	inches
Clearance	Exhaust pipe clearance to combustible materials	305	mm
Clearance	Mounting base surface height above floor (minimum)	152	mm
Clearance	Mounting base surface height above floor (minimum)	6	inches
Clearance	Sheet metal covering beyond extremities of set on wood floors	12	inches
Clearance	Sheet metal covering beyond extremities of set on wood floors	305	mm
Clearance	Vibration isolator base elevation difference between isolators (max)	0.25	inch
Clearance	Vibration isolator top plate to base clearance (nominal)	0.25	inch
Clearance	Vibration isolator top plate to base clearance (nominal)	6	mm
Other	Fuel pump maximum lift	1.8	m
Other	Fuel pump maximum lift	6	ft
Other	Radiator air inlet vent opening (relative to radiator opening)	1.5 to 2	times larger than radiator opening	radiator cooled sets
Other	Remote control wiring size, distance 1000 to 2000 feet (305 to 610 m)	16	gauge stranded copper
Other	Remote control wiring size, distance less than 1000 feet (305 m)	18	gauge stranded copper
Pressure	Engine oil pressure gauge reading	275 to 414	kPa	engine at operating temperature
Pressure	Engine oil pressure gauge reading	40 to 60	psi	engine at operating temperature
Pressure	Maximum allowable exhaust back pressure	10.2	kPa
Pressure	Maximum allowable exhaust back pressure	40.8	in. H2O
Pressure	Oil priming pressure at filter head priming port	207	kPa
Pressure	Oil priming pressure at filter head priming port	30	psi
Pressure	Oil priming pressure during engine cranking	103	kPa	maintained for 15 seconds while cranking
Pressure	Oil priming pressure during engine cranking	15	psi	maintained for 15 seconds while cranking
Temperature	Raw water discharge temperature (heat exchanger cooled sets)	165 to 195	°F	operating at full load
Temperature	Raw water discharge temperature (heat exchanger cooled sets)	74 to 91	°C	operating at full load
Temperature	Water temperature gauge reading	165 to 195	°F	depending on load and ambient temperature
Temperature	Water temperature gauge reading	74 to 91	°C	depending on load and ambient temperature
Torque	Oil filter housing plug	15 to 20	ft lb
Torque	Oil filter housing plug	20 to 27	N·m
Voltage	Battery gauge (DC voltmeter) reading	24 to 28	volts	while set is running

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		All ethylene glycol base permanent antifreeze coolants; compatible with plain water		91.0 L	Engine coolant is drained prior to shipment; refer to engine manufacturer's manual for methoxy propanal base antifreeze
Fuel	ASTM No. 2 Diesel				Alternate diesel fuels within the specifications delineated in the engine manual may be used

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

Code	Name	Meaning
1	Fault 2 - Input Non-Timed Shutdown	Terminal board TB2 indication (12-light Control, NFPA 110)
2	Fault 2 - Output Shutdown	Terminal board TB2 indication (12-light Control, NFPA 110)
3	Fault 1 - Input Timed Shutdown	Terminal board TB2 indication (12-light Control, NFPA 110)
4	Fault 1 - Output Shutdown	Terminal board TB2 indication (12-light Control, NFPA 110)
5	Lamp Test/Reset	Terminal board TB2 indication (12-light Control, NFPA 110)
6	Overcrank	Terminal board TB2 indication (12-light Control, NFPA 110)
7	Overspeed	Terminal board TB2 indication (12-light Control, NFPA 110)
8	High Engine Temperature	Terminal board TB2 indication (12-light Control, NFPA 110)
9	Low Oil Pressure	Terminal board TB2 indication (12-light Control, NFPA 110)
10	Pre-High Engine Temperature	Terminal board TB2 indication (12-light Control, NFPA 110)
11	Pre-Low Oil Pressure	Terminal board TB2 indication (12-light Control, NFPA 110)
12	Switch Off	Terminal board TB2 indication (12-light Control, NFPA 110)
13	Low Engine Temperature	Terminal board TB2 indication (12-light Control, NFPA 110)
14	Low Fuel - Input	Terminal board TB2 indication (12-light Control, NFPA 110)
15	Low Fuel - Output	Terminal board TB2 indication (12-light Control, NFPA 110)
16	Shutdown	Terminal board TB2 indication (12-light Control, NFPA 110)

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Procedures

Battery Connections installation

⚠ Ignition of explosive battery gases can cause severe personal injury. Do not smoke or allow arc-producing devices around the battery area.

⚠ Do not disconnect battery cables while the generator set is cranking or running.

Use two 12-volt batteries for a normal installation.
Connect the batteries in series: negative post of the first battery to the positive post of the second battery.
Connect the negative (-) battery cable last to reduce the risk of arcing.
If an automatic transfer switch is not used or has no built-in charge circuit, connect a float charger to the batteries.

Prestart Preparation Checklist installation

Check ventilation and exhaust systems.
Check all mechanical connections.
Fill the coolant, lubrication and fuel systems.
Prime the lubrication and fuel systems.
Check the fuel system for leaks.
Check the lubrication system for leaks.
Verify all electrical connections are secure and wiring is complete.
Check load cables are properly connected to transfer switch or circuit breaker panel.

Vibration Isolators Installation and Adjustment Procedure installation

Place the isolators on the genset support structure.
Shim or grout isolators so all isolator bases are within 0.25 inch (6 mm) elevation of each other; surface must be flat.
Loosen the side snubber lock nuts so the top plate is free to move vertically and horizontally.
Place the genset onto the isolators, aligning the skid's mounting with the threaded isolator hole.
Insert the leveling bolt through the skid and into the isolator; lock nut threaded up toward the bolt head.
Adjust the leveling bolt for a nominal clearance of 0.25 inch (6 mm) or greater between top plate and base.
Adjust leveling bolts until the set is level and sufficient clearance remains; lock leveling bolt with lock nut.
Snubber nuts may remain loose to provide better isolation.

Fuel System Priming maintenance

⚠ Diesel injection system tolerances are precise; keep fuel clean and free of water to avoid damage to injection pump and nozzles.

Remove each fuel filter and fill with clean fuel.
Put a light coat of fuel on the sealing gasket.
Install and tighten by hand until the gasket just touches the filter head.
Tighten the filter an additional one-half to three-fourths turn.

Lubrication System Fill and Prime maintenance

Tools: hand or motor driven priming pump with pressure gauge, torque wrench

Remove oil inlet line from turbocharger housing; fill bearing housing with clean engine lubricating oil; replace line and secure.
Fill crankcase to L (low) mark on dipstick.
Connect a hand or motor driven priming pump with pressure gauge from clean oil source to the plug boss in the filter housing.
Prime until a 30 psi (207 kPa) pressure is obtained.
Disconnect wire from fuel solenoid valve.
On the engine control panel, depress the RUN switch to crank the engine, maintaining 15 psi (103 kPa) oil priming pressure for 15 seconds at the filter head priming port.
Stop engine cranking, remove external priming equipment, reinstall plug in filter housing and torque to 15 to 20 ft lb (20 to 27 N·m).
Reconnect wire to fuel solenoid valve.
Complete oil fill to H (high) mark on dipstick.

Initial Start and Checks operation

⚠ High AC voltages present hazard of severe personal injury or death; during a no-load test there should be no AC output current readings.

⚠ Inhalation of exhaust gases can result in severe personal injury or death; shut down and repair leaks immediately.

⚠ Leaking fuel creates fire or explosion hazard.

Tools: remote voltmeter (on sets without AC meters)

Confirm that Field Circuit Breaker is at Reset position.
Place the Lamp Test/Reset/Panel Lamp switch at LAMP TEST; all indicator lamps will illuminate; then place switch at PANEL LAMP.
Place the Run/Stop/Remote switch at RUN; starter cranks and engine should start within a few seconds.
Check oil pressure gauge reads 40 to 60 psi (275 to 414 kPa) at operating temperature.
Check water temperature gauge reads 165° to 195°F (74° to 91°C).
Check battery gauge reads approximately 24 to 28 volts while set is running.
Check generator frequency meter is stable and reads nameplate rating (50 or 60 Hz).
Check AC amperes: zero at no-load; all three phases approximately the same under load; no line current exceeds nameplate rating.
Check line-to-line AC voltage at full load equals nameplate rating; adjust Voltage Adjust rheostat as necessary.
Inspect the entire exhaust system visually and audibly for leaks.
Inspect fuel supply lines, filters, and fittings for leaks; check flexible sections for cuts, cracks and abrasions.
Stop the set by moving Run/Stop/Remote switch to STOP.

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	Notes
110/190	3	3/50
118/200	3	3/50
118/230	3	3/50
120/208	3	3/60
120/240	3	3/60
127/220	3	3/60
139/240	3	3/60
220/380	3	3/60
230/400	3	3/50
240/416	3	3/60
254/440	3	3/60
277/480	3	3/60
347/600	3	3/60

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Parts cataloged across the Cummins/Onan KTTA19 family

Part #	Description	Category
140-2096	Element, Primary (Outer)	Air filter
140-2098	Air Cleaner - Throwaway Type	Air filter
140-2463	140-2464 3 98-5822 4 309-0436 505-0117 5 309-0437 SOS- SOS 503 8 501 9 1 SO- lO 130 11 98	Air filter
140-2464	Air Cleaner - Safety Standard	Air filter
140-2467	Element, Safety (Inner)	Air filter
309-0272	Regulator, Voltage - 24 VDC (Used on 35 A MP Alternator)	Alternator
205431	Cable, Battery - Jumper (12"LG)	Battery
511-0162	Belt, Drive - Fan	Belt
3318319	Cummins Part No. DCA4 Units	Coolant filter
333-0407-05	Heater, Oil (300 Watt, 480 Volt)	Fluid
149-2249	Filter, Fuel	Fuel filter
130-3538	Chemical DCA4 Service Pre-Charging Complete System	Hose
130-3576	Clamp, Hose	Hose
333-0407-02	Hose, Radiator	Hose
333-0407-04	Hose, Radiator	Hose
501-0554	Line. Flexible	Hose
503-0183	Clamp, Hose	Hose
98-5759	Drive - Multi Groove Hose, Flexible - Lube (Grease)	Hose
122-0526	Element, Filter	Oil filter
3313283	Bypass oil filter (Cummins Part No. 3313283)	Oil filter
140-2097	Cleaner, Air (Includes Elements)	Service part / kit
3318201	Battery Cable Group	Service part / kit
332-1281	Plate, Mounting - Terminal	Service part / kit
332-1292	Sender, Pressure - Oil (E123)	Service part / kit
501-0084	Line, Fuel - Flexible "FUEL OUT" (45' 7/8-14 Female Swivel x	Service part / kit
501-0216	Line, Fuel	Service part / kit
502-0175	Part 502-0175	Service part / kit
50510	Bushing, Reducer - Flush (1/2 NPT x 3/8 NPT)	Service part / kit
800-0270	DCA4 Service Pre-Charging Complete System	Service part / kit
903-0125	NA	Service part / kit
903-0205	NA	Service part / kit
903-0605	NA	Service part / kit
98-6108-02	Label - Warning (HOT PRESSURIZED COOLANT SYSTEM)	Service part / kit
98-6108-03	Decal - Model Identification	Service part / kit
98-6111-02	Decal - Model Identification ONAN GEN SET	Service part / kit
98-6111-03	ONAN GEN SET CUMMINS GEN SET	Service part / kit
98-6139-02	CUMMINS GEN SET	Service part / kit
98-6139-03	CUMMINS ONAN GEN SET	Service part / kit
193-0244	Sender, Oil Pressure (E1)	Sensor
193-0353	Sender, Temperature - Oil	Sensor

Parts cataloged across all variants of this engine family — verify the exact part fits your specific variant and serial number before ordering.

Common questions

What is the oil capacity of the Cummins/Onan KTTA19-G2?

The Cummins/Onan KTTA19-G2 engine has an oil capacity of 45.0 liters.

What is the displacement of the Cummins/Onan KTTA19-G2?

The Cummins/Onan KTTA19-G2 has a displacement of 19.0 liters with 6 cylinders.

Which generators use the Cummins/Onan KTTA19-G2 engine?

The Cummins/Onan KTTA19-G2 powers 4 generator set(s), including Cummins/Onan 500 DFFB, Cummins/Onan DBFB, Cummins/Onan DMEB, Cummins/Onan DMFB.

What is a common problem with the Cummins/Onan KTTA19-G2 engine?

A commonly reported issue on generators using the Cummins/Onan KTTA19-G2 is: The FAULT 1 or FAULT 2 fault lamp lights. Engine shuts down immediately, engine runs for several seconds and then shuts down, or engine continues to run. Cause: The standard undesignated fault functions are programmed to shut down the set when a fault is sensed. Fault 1 is timed delayed while Fault 2 is immediate. The nature of the fault is an optional selection that is determined when the set installation is designed. The undesignated fault functions may also be programmed for non-shutdown or non-time delay..