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Caterpillar C4.4 Engine

The Caterpillar C4.4 is a 4.4 L 4-cylinder t, ta engine rated at 1800 rpm, producing up to 129 kW. It powers generator sets from Caterpillar, including the D100, D100-6 and D40. It holds 9.4 L (2.5 gal) of oil and 18.3 L (4.8 gal) of coolant.

Also known as: Caterpillar C4.4

Part of the Caterpillar C4.4 engine family — 2 variants share parts & fitment.

4.4 L

Displacement

Cylinders

1800 rpm

Rated speed

129 kW

Gross power

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

Engine specifications

Oil capacity	9.4 L
Coolant capacity	18.3 L
Displacement	4.4 L
Cylinders	4
Aspiration	T, TA
Rated speed	1800 rpm
Gross power	129 kW

Generator sets powered by this engine

Caterpillar C4.4 Caterpillar D100 Caterpillar D100-6 Caterpillar D40 Caterpillar D40-6 Caterpillar D50 Caterpillar D50-6 Caterpillar D60 Caterpillar D80 Caterpillar DE110E2 Caterpillar DE88 GCCaterpillar LC3114DCaterpillar XQ100 Caterpillar XQ125 Caterpillar XQ80

How to read your Caterpillar engine serial & model number →

Common problems

Low Oil Pressure Warning
Fix: The fault will be active and logged only if the engine has been running for more than 8 seconds. Refer to Troubleshooting, “5 Volt Sensor Supply Circuit - Test”.
Interruption in signal from Primary Speed/Timing Sensor
Fix: Stop the engine immediately. Turn the keyswitch to the ‘OFF’ position. Refer to Troubleshooting, “Engine speed/Timing sensor - Test”.
Flash Code 551 indicates that No Detected Faults have occurred since the ignition keyswitch has been turned to the ON position. 551
Failure of the Primary Speed/Timing Sensor
Fix: Refer to Troubleshooting, “Engine speed/Timing sensor - Test”.
Failure of the Engine Oil Pressure Sensor
Fix: The diagnostic lamp warns the user about the status of the engine oil pressure sensor. The engine oil pressure related strategies will be disabled in the event of a failure of the engine oil pressure sensor. Refer to Troubleshooting, “5 Volt Sensor Supply Circuit - Test”.
Failure of the Coolant Temperature Sensor
Fix: Refer to Troubleshooting, “Engine Temperature Sensor Circuit - Test”.
Engine may not start properly due to severely discharged battery. i02710753
Fix: After jump starting, the alternator may not be able to fully recharge batteries that are severely discharged. The batteries must be replaced or charged to the proper voltage with a battery charger after the engine is stopped.
An overspeed condition is detected by the Electronic Control Module (ECM). The event code E0190 will be logged if the engine speed exceeds 3300 rpm. E0190

Compiled from service & troubleshooting documentation across every generator set that uses the Caterpillar C4.4.

Maintenance schedule

Item	Spec	Capacity	Part #	Interval
Air filter	Dry replaceable paper element type with restriction indicator		—
Fuel filter			—	500 hr
Oil filter			—	500 hr
Battery	CAT 230-6368 (12.5VDC)		230-6368		eBay $204.30
Belt			—	3000 hr
Coolant	Standard ambient temperatures up to 50° C (122° F)	17.1 L	—
Coolant filter	Radiator and cooling fan complete with protective guards		—
Oil		13.0 L	—	500 hr
Spark plug	Not specified		—

Pooled from every document that names this exact engine — confirm the interval and part number against your unit's serial number.

Repair guides

Step-by-step procedures compiled from the Caterpillar service manual for this engine.

Service intervals

Item	Action	Hours	Months	Notes
Fuel Tank Water and Sediment	Drain	50 hr		Every 50 Service Hours or Weekly. Schedule for X3B1-Up, XYC1-Up, XYD1-Up, N4R1-Up, N3X1-Up, N4X1-Up
Cooling System Coolant Sample (Level 1)	Other	250 hr		Every 250 Service Hours - Obtain. Schedule for X3B1-Up, XYC1-Up, XYD1-Up, N4R1-Up, N3X1-Up, N4X1-Up
Battery Electrolyte Level	Check	500 hr	12 mo	Every 500 Service Hours or 1 Year. Schedule for X3B1-Up, XYC1-Up, XYD1-Up, N4R1-Up, N3X1-Up, N4X1-Up
Cooling System Coolant Sample (Level 2)	Other	500 hr	12 mo	First service — Initial 500 Hours (for New Systems, Refilled Systems, and Converted Systems) - Obtain. Schedule for X3B1-Up, XYC1-Up, XYD1-Up, N4R1-Up, N3X1-Up, N4X1-Up
Engine oil	Change	500 hr		500-hour engine oil change interval
Fuel filter	Change	500 hr		Oil and fuel filter change intervals: 500 hrs
Oil filter	Change	500 hr
Engine Valve Lash	Adjust	1000 hr		Every 1000 Service Hours - Inspect/Adjust. Initial adjustment recommended at the first scheduled oil change. Schedule for X3B1-Up, XYC1-Up, XYD1-Up, N4R1-Up, N3X1-Up, N4X1-Up
Cooling System Water Temperature Regulator	Replace	3000 hr	36 mo	Every 3000 Service Hours or 2 Years. Schedule for X3B1-Up, XYC1-Up, XYD1-Up, N4R1-Up, N3X1-Up, N4X1-Up
Fuel Injection Nozzles	Test	3000 hr		Every 3000 Service Hours - Test/Exchange. Schedule for X3B1-Up, XYC1-Up, XYD1-Up, N4R1-Up, N3X1-Up, N4X1-Up
Multi-vee belts	Replace	3000 hr		3,000 hrs service interval
Cooling System Coolant Extender (ELC)	Other	6000 hr	36 mo	Every 6000 Service Hours or 3 Years - Add. Schedule for X3B1-Up, XYC1-Up, XYD1-Up, N4R1-Up, N3X1-Up, N4X1-Up
Alternator	Inspect	2000 hr	12 mo	Every Year. Schedule for D4D1-Up, GLE1-Up
Alternator Belt	Inspect	500 hr	12 mo	Every Year - Inspect/Adjust/Replace. Schedule for D4D1-Up, GLE1-Up
Battery	Replace		36 mo	Every 3 Years. Schedule for D4D1-Up, GLE1-Up
Cooling System Coolant (ELC)	Change	12000 hr	72 mo	Every 6 Years. Schedule for D4D1-Up, GLE1-Up
Engine	Clean		12 mo	Every Year. Schedule for D4D1-Up, GLE1-Up
Engine Air Cleaner Element (Single Element)	Replace	500 hr	12 mo	Every Year. Schedule for D4D1-Up, GLE1-Up
Engine Mounts	Inspect	2000 hr	12 mo	Every Year. Schedule for D4D1-Up, GLE1-Up
Engine Oil Sample	Other	500 hr	12 mo	Every Year - Obtain. Schedule for D4D1-Up, GLE1-Up
Engine Oil and Filter	Change	500 hr	12 mo	Every Year. Schedule for D4D1-Up, GLE1-Up
Fuel System Primary Filter (Water Separator) Element	Replace	500 hr	12 mo	Every Year. Schedule for D4D1-Up, GLE1-Up
Fuel System Secondary Filter	Replace	500 hr	12 mo	Every Year. Schedule for D4D1-Up, GLE1-Up
Generator Set Vibration	Test	2000 hr	12 mo	Every Year - Test/Record. Schedule for D4D1-Up, GLE1-Up
Hoses and Clamps	Inspect	500 hr	12 mo	Every Year - Inspect/Replace. Schedule for D4D1-Up, GLE1-Up
Insulation	Test	100 hr	12 mo	Every Year. Schedule for D4D1-Up, GLE1-Up
Rotating Rectifier	Check	1000 hr	12 mo	Every Year. Schedule for D4D1-Up, GLE1-Up
Starting Motor	Inspect	2000 hr	12 mo	Every Year. Schedule for D4D1-Up, GLE1-Up
Water Pump	Inspect	3000 hr	12 mo	Every Year. Schedule for D4D1-Up, GLE1-Up

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	Generator bearing bracket step	less than 0.0762	mm (0.0030 inch)
Other	Alternator belt tension, new belt	400 N (90 lb) to 489 N (110 lb)	N (lb)	new belt
Other	Alternator belt tension, used belt	267 N (60 lb) to 356 N (80 lb)	N (lb)	used belt in operation 30 minutes or more at rated speed
Other	Compression ratio	16.5:1
Other	Cooling system coolant level (filler pipe / sight glass)	within 13	mm (0.5 inch)	below bottom of filler pipe
Other	Electric fuel priming pump operating time	90	seconds
Other	Fuel system priming hand pump operations	100	depressions
Other	Generator pitch	2/3
Other	Harmonic Distortion (THD)	Less than 5	%
Other	Maximum Pressure - Implement Circuit (Heavy Lift)	37000	kPa
Other	Maximum Pressure - Implement Circuit (Normal)	35000	kPa
Other	Maximum cooling system fill rate	5	L (1.3 US gal) per minute
Other	Maximum engine cranking time	30	seconds
Other	Number of leads	12
Other	Rating condition (diesel 7 L and higher)	99 kPa (29.31 in Hg) dry barometer, 25°C (77°F)		SAE J1995 inlet air standard
Other	Rating condition (diesel up to 6.6 L)	100 kPa (29.5 in Hg) total barometric pressure, 1 kPa (.295 in Hg) vapor pressure, 25°C (77°F)		ISO/TR14396 inlet air standard
Other	Rating condition (gas)	100 kPa (29.61 in Hg) and 25°C (77°F)		SAE J1349 standard
Other	Telephone Influence Factor (TIF)	Less than 50
Other	Wait time after engine stop before servicing high pressure fuel lines	60	seconds
Other	Wave form deviation	3	%
Pressure	Maximum compressed air pressure for cleaning generator	210	kPa (30 psi)
Resistance	Exciter armature (Rotor L2) insulation resistance minimum	0.25 megohm (250000 ohms)	megohm (ohms)
Resistance	Exciter field (Stator L1) insulation resistance minimum	0.25 megohm (250000 ohms)	megohm (ohms)
Resistance	Winding insulation resistance minimum	one megohm	megohm	windings free of moisture, room temperature
Speed	Hertz/Cycles	60	Hz	throughout test
Speed	Overspeed capability	125	% of rated
Temperature	Ambient Temperature	64	°F	5 min at 110 kW (readings 64-65°F)
Temperature	Coolant Temperature	187	°F	5 min at 110 kW (readings 187-188°F, 180°F during cool down)
Temperature	Cooling system fill flush temperature	49 to 66	°C (120 to 150 °F)	engine at low idle
Temperature	Forced air drying oven	65	°C (149 °F)	four hours
Temperature	Generator bearing alarm temperature (EMCP 3.2/3.3)	85	°C (185 °F)
Temperature	Generator bearing shutdown temperature (EMCP 3.2/3.3)	95	°C (203 °F)
Temperature	Hub heating temperature for reinstallation	400	°C (752.0 °F)	three hours
Temperature	Induction heater ball bearing installation temperature	107	°C (224.6 °F)	ten minutes
Temperature	Maximum winding temperature when drying generator	85	°C (185.0 °F)
Torque	Engine air cleaner service indicator	2	N·m (18 lb in)
Torque	Fuel system primary filter (water separator) element screw	8	N·m (6 lb ft)
Torque	High pressure fuel line flare nuts	30	N·m (22 lb ft)
Torque	Oil filter bowl	25	N·m (18 lb ft)
Torque	Oil filter drain plug	12	N·m (8 lb ft)
Voltage	DC Voltage	13.7		throughout test
Voltage	Voltage regulation	Less than ± 1⁄2%	%	voltage gain (adjustable to compensate for engine speed droop and line loss)

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	50/50 Extended Life Coolant			18.3 L	Engine & radiator coolant capacity
Coolant	Cat DEAC				Diesel; 3,000 Service Hours or Three Years; annual S·O·SSM Level 2 coolant sampling and analysis
Coolant	Cat ELC				Diesel; 12,000 Service Hours or Six Years; add Cat ELC Extender at 6,000 service hours or one half of service life; annual S·O·SSM Level 2 coolant sampling and analysis
Coolant	Cat NGEC				Natural Gas; 16,000 Service Hours or Three Years; use interval that occurs first
Coolant	Commercial long life coolants	Caterpillar Engine Coolant Specification -1 (Caterpillar EC-1)			Level 1 sample every 250 hours; Level 2 yearly
Coolant	Diesel Engine Antifreeze/Coolant (DEAC)	Cat DEAC			Level 1 coolant sample every 250 hours; Level 2 yearly
Coolant	Extended Life Coolant (ELC)	Cat ELC			Use only Cat ELC Extender with Cat ELC. Do NOT use conventional supplemental coolant additive (SCA) with Cat ELC. Change every 12 000 service hours or 6 years; add extender every 6000 service hours or 3 years
Engine oil		EPA 2D 89.330-96 (fuel reference, Diesel <6.6 L, density 0,845-0,850 kg/L a 15 °C)			Reference condition only, not a lubricant recommendation
Engine oil	Cat NGEO				Natural Gas
Engine oil	low sulfated ash oil				Required for U.S. EPA Tier 4 Final, EU Stage IV engines.
Engine oil	Cat Arctic DEO SYN SAE 0W-30		-40°C to 30°C		Engine Crankcase; Industrial Engines
Engine oil	Cat DEO SYN SAE 5W-40		-30°C to 50°C		Engine Crankcase; Industrial Engines
Engine oil	Cat DEO SAE 10W-30		-18°C to 40°C		Engine Crankcase; Industrial Engines
Engine oil	Cat DEO SAE 15W-40		-9°C to 50°C		Engine Crankcase; Industrial Engines
Fuel		Ultra Low Sulfur Diesel (ULSD)			Contains less than or equal to 15 parts per million sulfur (mg/kg); required for U.S. EPA Tier 4 Final, EU Stage IV engines. B20 biodiesel capability available.
Fuel	35° API gravity at 60°F (16°C)	LHV 18,390 Btu/lb (42 780 kJ/kg)			Fuel at 85°F (29°C) weighing 7.001 lbs/U.S. gal (838.9 g/liter)
Fuel	35° API gravity, LHV 42 780 kJ/kg (18,390 btu/lb)	SAE J1995			Diesel engines 7 liter and higher; used at 29°C (84.2°F) with density 838.9 g/L
Fuel	EPA 2D 89.330-96	EPA 2D 89.330-96			Diesel engines up to 6.6 liter; density 0.845-0.850 kg/L @ 15°C (59°F); fuel inlet temperature 40°C (104°F)
Fuel	dry natural gas, LHV 35.54 MJ/Nm3 (905 btu/ft3)				Gas ratings based on SAE J1349 standard conditions of 100 kPa (29.61 in Hg) and 25°C (77°F)
Grease	Cat Generator Set Grease				Part Number 108-8611
Grease	EA6		-40°C to 80°C		Non-regreasable bearings 311-0843 and 311-0844
Grease	Mobilith SHC220		-40°C to 80°C	2.8 g (0.1 oz)	Roller bearings 139-0349 and 139-0350; every 250 service hours
Grease	2S-3230 Bearing Lubricant		-29°C to 80°C	51.2 g (1.8 oz)	59 mL (2 oz). Every 2000 service hours or 12 months. Do not mix greases
Grease	UNIREX N3		-29°C to 60°C	60.0 g (2.1 oz)	Bearing 241-4644; every 4500 service hours or 12 months. Do not exceed 60 C (140 F) above the ambient temperature
Other	5N-5561 Silicone Lubricant, petroleum jelly or MPGM				Coat battery clamps and terminals
Other	Hydrosolv100 liquid cleaner				Part numbers 1U-8804 (4 L), 1U-5492 (19 L), 8T-5571 (208 L)
Other	Hydrosolv4165 liquid cleaner				Part numbers 1U-8812 (4 L), 1U-5490 (19 L), 8T-7570 (208 L)

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

Procedures

Engine Valve Lash - Inspect/Adjust adjustment

⚠ Only qualified service personnel should perform this maintenance

⚠ Hot engine components can cause burns

Initial valve lash adjustment recommended at the first scheduled oil change.
Ensure the engine cannot be started while this maintenance is performed.
Do not use the starting motor to turn the flywheel.
Allow valves to cool before measuring valve lash.
Refer to the Service Manual for the complete valve lash adjustment procedure.

Fuel Injection Nozzles - Test/Exchange diagnostic

⚠ Fuel leaked onto hot surfaces or electrical components can cause a fire

⚠ Wear eye protection at all times during testing

⚠ Test fluid can pierce the skin and cause serious injury

Tools: 8S-2245 Injector Cleaning Tool Group

Isolate each fuel injection nozzle one at a time to determine the malfunctioning nozzle.
Start the engine.
Loosen each fuel line nut one at a time at the fuel injection pump.
Use a cloth to prevent fuel spraying on hot exhaust components. Tighten each nut before loosening the next.
A faulty nozzle is indicated when exhaust smoke is partially or completely eliminated and performance is unaffected.
Remove suspected nozzle and install a new nozzle to determine if removed nozzle is faulty.
Clean, inspect and test nozzles. Do not use a wire brush. Use 8S-2245 Injector Cleaning Tool Group.

Generator Set - Test diagnostic

⚠ Personal injury or death can result from high voltage

⚠ Make sure the unit is off-line, locked out or tagged DO NOT OPERATE

⚠ Make sure all capacitors are discharged

Tools: 6V-7070 Digital Multimeter, 12 VDC battery, Potential Transformer

Stop the generator. Connect the potential transformer's high voltage winding to generator terminals T1 and T2.
Connect the voltmeter to the low voltage winding. Connect a second transformer to T1 and T3 if available.
Connect the secondary terminals corresponding to T2 of both transformers together.
Disconnect wires "E+" and "E-" from the voltage regulator. Disconnect the generator from the load.
Connect a 12 VDC automotive battery to wires "E+" and "E-".
Measure AC voltage across low voltage terminals for T1-T2, T2-T3 and T3-T1. Record the voltages.

Insulation - Test diagnostic

⚠ Personal injury or death can result from electrocution

⚠ Do not touch the instrument leads without first discharging them

⚠ When finished testing also discharge the generator windings

Tools: 142-5055 Insulation Tester Megohmmeter

Isolate the generator. Ensure windings are free of moisture and at room temperature.
Main Armature (Stator L4): open the line circuit breaker or load connections T1, T2, T3, T0.
Prevent wires from contacting each other or ground. Isolate main armature from the voltage regulator.
Connect one test lead to the generator enclosure (ground) and the other to generator lead T0.
Insulation resistance must be one megohm or more.
Exciter Field (Stator L1): disconnect wires 5+ and 6-.
Connect megohmmeter between generator enclosure (ground) and exciter field lead (5+ or 6-).
Exciter field insulation resistance must be a minimum of 0.25 megohm (250000 ohms).
Exciter Armature (Rotor L2): disconnect the three wires of the exciter armature from the rectifier blocks.
Connect one test lead to the rotor shaft and the other to any one exciter field lead.
Insulation resistance must be a minimum of 0.25 megohm (250000 ohms).

Rotating Rectifier - Test diagnostic

⚠ A shorted diode can cause damage to the exciter rotor

⚠ Check the exciter rotor if a diode is shorted

Tools: Digital multimeter with diode range

Set the digital multimeter on the diode range. Remove all leads from the rectifier block.
Negative block: place red lead on negative "-" terminal (1), black lead on AC terminals (2), (3), (4). Readings should be 0.4 to 1.0.
Negative block: place black lead on negative "-" terminal (1), red lead on AC terminals (2), (3), (4). Meter should read "OL" (overload).
Positive block: place red lead on positive "+" terminal (1), black lead on AC terminals (2), (3), (4). Meter should read "OL".
Positive block: place black lead on positive "+" terminal (1), red lead on AC terminals (2), (3), (4). Readings should be 0.4 to 1.0.
If any meter reading does not fall within the given ranges, replace the rectifier block.

Alternator - Inspect maintenance

⚠ A battery with a low charge will freeze more easily than a battery with a full charge

Inspect the alternator for loose connections and proper battery charging.
Inspect the ammeter (if equipped) during engine operation.
Check the alternator and the battery charger for proper operation.
Make repairs as required. Refer to the Service Manual.

Alternator Belt - Inspect/Adjust/Replace maintenance

⚠ Replace belts in matched sets for multiple drive belts

Tools: 144-0235 Belt Tension Gauge

Inspect the belts for wear and for cracking. Replace belts that are worn or damaged.
Install gauge (1) at center of belt between alternator and crankshaft pulley.
Check tension: new belt 400 N (90 lb) to 489 N (110 lb).
Used belt (30 minutes or more at rated speed): 267 N (60 lb) to 356 N (80 lb).
If twin belts are installed, check and adjust tension on both belts.
Loosen mounting bolts (2) and adjusting bolt (1).
Move alternator to increase or decrease belt tension.
Tighten adjusting bolt (1). Tighten mounting bolts (2) to specified torque.

Battery - Replace maintenance

⚠ Batteries give off combustible gases which can explode

⚠ Remove the battery cover before any servicing is attempted

⚠ Always recycle a battery. Never discard a battery

Turn key start switch to OFF. Remove key and all electrical loads.
Turn OFF the battery charger. Disconnect the charger.
Disconnect NEGATIVE "-" cable from the NEGATIVE "-" battery terminal.
Disconnect POSITIVE "+" cable from the POSITIVE "+" battery terminal.
Remove the used battery. Install the new battery.
Connect cable from starting motor to POSITIVE "+" battery terminal.
Connect cable from ground plane to NEGATIVE "-" battery terminal.

Battery Electrolyte Level - Check maintenance

⚠ All lead-acid batteries contain sulfuric acid which can burn skin and clothing

⚠ Always wear a face shield and protective clothing

Tools: 245-5829 Coolant Battery Tester Refractometer

Remove the filler caps. Maintain the electrolyte level to the "FULL" mark.
Use distilled water if water must be added.
Check condition of electrolyte with 245-5829 Coolant Battery Tester Refractometer.
Clean battery case with baking soda and water or ammonia and water mixture.
Rinse battery case thoroughly with clean water.
Clean terminals and cable clamps with fine grade sandpaper.
Coat clamps and terminals with 5N-5561 Silicone Lubricant, petroleum jelly or MPGM.

Battery or Battery Cable - Disconnect maintenance

⚠ Removing battery cables with the battery cover in place may cause a battery explosion

Turn start switch to OFF. Turn ignition switch OFF and remove key.
Disconnect negative battery terminal at the battery that goes to the start switch.
When four 12 volt batteries are involved, disconnect negative side of two batteries.
Tape the leads to prevent accidental starting.
Reverse the steps to reconnect all of the cables.

Cooling System Coolant (ELC) - Change maintenance

⚠ Pressurized System: Hot coolant can cause serious burns

⚠ Dispose of used engine coolant properly or recycle

Tools: 9S-8140 Pressurizing Pump

Stop engine and allow to cool. Loosen filler cap slowly, relieve pressure, remove cap.
Open drain cock or remove drain plug (1) on engine and on radiator. Allow coolant to drain.
Flush cooling system with clean water to remove any debris.
Close drain valve, clean drain plugs and install drain plugs.
Fill with clean water and install cooling system filler cap.
Run engine at low idle until temperature reaches 49 to 66 C (120 to 150 F).
Stop engine. Drain water and flush again. Close valve and install drain plugs.
Fill with Extended Life Coolant (ELC). Do not install filler cap.
Run engine at low idle, then high idle for one minute to purge air. Stop engine.
Maintain coolant within 13 mm (0.5 inch) of bottom of filler pipe or sight glass level.
Clean filler cap and inspect gasket. Pressure test with 9S-8140 if gasket not damaged.
Start engine. Inspect cooling system for leaks and proper operating temperature.

Cooling System Coolant Extender (ELC) - Add maintenance

⚠ Use only Cat ELC Extender with Cat ELC

⚠ Do NOT use conventional supplemental coolant additive (SCA) with Cat ELC

⚠ Check the cooling system only when the engine is stopped and cool

Loosen cooling system filler cap slowly to relieve pressure. Remove cap.
It may be necessary to drain enough coolant to add the Cat ELC Extender.
Add Cat ELC Extender according to requirements for your cooling system capacity.
Clean filler cap. Inspect gaskets. Replace cap if gaskets are damaged. Install cap.

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
208/120V	3-phase	4-position rotary switch	12	Optional 600V generator
240/120V	1-phase	4-position rotary switch	12	Optional 600V generator
277/480	3	MULTI		Generator end is 12 lead reconnectable; equipped with PMG permanent magnet generator
480/277V	3-phase	4-position rotary switch	12	Optional 600V generator
600/347V	3-phase	4-position rotary switch	12	Optional 600V generator

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 Caterpillar C4.4 family

Part #	Description	Category
110-6326	Air Primary	Air filter
123-2367	Air Primary	Air filter
130-4678	Air Primary Filter	Air filter
130-4679	Air Secondary Filter	Air filter
160-7163	Air Filter	Air filter
1M7250	Air filter housing	Air filter
206-5234	Air Primary Filter	Air filter
211-2660	Air filter assy	Air filter
247-1380	Air Filter	Air filter
263-0544	Air filter	Air filter
270-7361	Air filter	Air filter
270-7362	Air filter	Air filter
270-7368	Air filter	Air filter
321-2411	Air Primary Filter	Air filter
321-2413	Air Filter	Air filter
375-2606	Twin Turbocharger Alignment Tool	Alignment tool
339-7767	Alternator	Alternator
AN500T0093	ALTERNATOR	Alternator
033-7854	Filter fuel	Fuel filter
1R-1804	Fuel/Water Separator	Fuel filter
1R1804	Filter fuel	Fuel filter
252-6338	Filter water separator	Fuel filter
258-8538	Fuel	Fuel filter
276-1804	Fuel	Fuel filter
276-1806	Fuel Filter	Fuel filter
287-6052	Fuel	Fuel filter
288-4572	Fuel	Fuel filter
299-8229	Filter fuel	Fuel filter
308-7298	Filter water separator	Fuel filter
232-6662	Glow plug	Glow plug
093-7521	Filter hydraulic	Hydraulic filter
119-4740	Hydraulic filter	Hydraulic filter
230-8999	Fuel injector	Injector
AEXQ3237-00	Keyless push-to-start engine control	Keyless push-to-start engine control
220-1523	Engine Oil	Oil filter
7W-2326	Engine Oil	Oil filter
7W2326	Filter oil	Oil filter
20382-3Zaz	Time delay relay No. 6	Service part / kit
2255441	Connecting rod (Grade L)	Service part / kit
2255453	Connecting rod (Grade J)	Service part / kit
2255454	Connecting rod (Grade H)	Service part / kit
230-6368	Battery	Service part / kit
24aOeLa	Time delay relay No. 8	Service part / kit
32RELAYS	Relay No. 4	Service part / kit
3590719	Special connecting rod (Grade R, beam length 6.5247-6.5260 inch)	Service part / kit
3590720	Special connecting rod (Grade O, beam length 6.5229-6.5242 inch)	Service part / kit
3590721	Special connecting rod (Grade W, beam length 6.5211-6.5224 inch)	Service part / kit
3590722	Special connecting rod (Grade G, beam length 6.5193-6.5206 inch)	Service part / kit
3590723	Special connecting rod (Grade P, beam length 6.5175-6.5188 inch)	Service part / kit
3590724	Special connecting rod (Grade B, beam length 6.5157-6.4961 inch)	Service part / kit
877202-2	Ignition kit	Service part / kit
CHARGEPRO5i5	GUEST battery charger	Service part / kit
276166	repair kit oil pump	Pump
299-9265	Lift/transfer pump	Pump
KM-BD-909002	Hydraulic Track Adjuster Seal Kit	Seal
KM-BD-909005	Hydraulic Track Adjuster Seal Kit	Seal
KM-BD-909006	Hydraulic Track Adjuster Seal Kit	Seal
KM-BD-909007	Hydraulic Track Adjuster Seal Kit	Seal
KM-BD-909016	Hydraulic Track Adjuster Seal Kit	Seal
225-3150	Starter motor	Starter
AN500T0010	STARTER MOTOR	Starter
254-2269	Thermostat	Thermostat
234-2988-RK	Turbocharger repair kit	Turbocharger

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

Aftermarket parts that fit this engine

103-5916 FridayParts $158.99 350-8687 FridayParts $160.59 VA53-BP70/LL-39A FridayParts $160.59 373-6995 FridayParts $198.40 126T FridayParts $73.56 033-7687 FridayParts $73.56 362-9416 FridayParts $407.89 195-0189 FridayParts $83.00 KuduParts $109.00 195-0190 FridayParts $83.00 KuduParts $109.00 336-9096 FridayParts $49.59 171-2212 FridayParts $75.99 578-0367 FridayParts $2565.99 2.3mm FridayParts $113.23 285-3473 FridayParts $113.23 3E-7587 FridayParts $139.95 322-3155 FridayParts $35.45 424-6821 FridayParts $167.72 20R-4050 FridayParts $625.60 591-2386 FridayParts $625.60 398-4747 FridayParts $625.60 466-7875 FridayParts $143.89 562-1852 FridayParts $143.89 386-3472 FridayParts $59.99 344-3456 FridayParts $121.60 344-3455 FridayParts $121.60 105-4849 FridayParts $82.99 153-2521 FridayParts $39.50 3E-6466 FridayParts $73.99 162-2073 FridayParts $73.99 3005-24V FridayParts $89.99 3E-7586 FridayParts $89.99 105-4850 FridayParts $89.99 139-4724 FridayParts $53.20 353-9667 FridayParts $49.99 370-7287 SinoCMP $179.00 FridayParts $699.99 096-1628 FridayParts $48.56 5P-8309 FridayParts $48.90 55mm FridayParts $18.56 7T-6655 KuduParts $17.00 FridayParts $18.56 321-0955 FridayParts $625.56 282-0455 FridayParts $625.56 425-7103 FridayParts $171.56 369-8502 KuduParts $350.00 FridayParts $359.99 350-7492 FridayParts $271.20 197-6548 FridayParts $145.99 5P-4924 FridayParts $29.50 290-2789 FridayParts $607.53 359-9885 FridayParts $258.56 423-5605 FridayParts $1814.59 195-0192 FridayParts $102.70 195-0191 FridayParts $102.70 5C-8964 FridayParts $30.99 5C-9029 FridayParts $30.99 327-6125 FridayParts $63.24 327-8515 FridayParts $63.24 148-8385 FridayParts $10.80 150-4037 FridayParts $27.42 135-5784 FridayParts $144.99 539-6920 KuduParts $104.00 FridayParts $108.99 110-2556 KuduParts $140.00 FridayParts $145.00

Parts listed by aftermarket suppliers as fitting this engine — leads compiled from supplier catalogs; verify the exact part for your serial number.

Also used in

Caterpillar 416E — Backhoe Loader
Caterpillar 420E — Backhoe Loader
Caterpillar 420E IT — Backhoe Loader
Caterpillar 430E — Backhoe Loader
Caterpillar 914K — Loader Wheeled
Caterpillar 920K — Loader Wheeled
Caterpillar CP54 — Compactor
Caterpillar CS54 — Compactor
Caterpillar D3K — Tractor Tracked
Caterpillar D4K LGP — Tractor Tracked
Caterpillar D4K XL — Tractor Tracked
Caterpillar D5K — Tractor Tracked

Other equipment known to use this engine, via filter-application cross-reference — useful for sourcing parts even when your exact machine isn't listed elsewhere on this page.

Common questions

What is the oil capacity of the Caterpillar C4.4?

The Caterpillar C4.4 engine has an oil capacity of 9.4 liters.

What is the displacement of the Caterpillar C4.4?

The Caterpillar C4.4 has a displacement of 4.4 liters with 4 cylinders.

Which generators use the Caterpillar C4.4 engine?

The Caterpillar C4.4 powers 15 generator set(s), including Caterpillar C4.4, Caterpillar D100, Caterpillar D100-6, Caterpillar D40, Caterpillar D40-6.

How often should you change the oil in the Caterpillar C4.4?

The Caterpillar C4.4 oil change interval is every 500 hours.

What is a common problem with the Caterpillar C4.4 engine?

A commonly reported issue on generators using the Caterpillar C4.4 is: Low Oil Pressure Warning. Fix: The fault will be active and logged only if the engine has been running for more than 8 seconds. Refer to Troubleshooting, “5 Volt Sensor Supply Circuit - Test”..