Caterpillar SR4B — Specs, Engine, Parts & Maintenance

Service parts for the SR4B

Grouped by system, with how many of each the parts manual calls for.

Air intake

1 required

101564109Air filtersee priceAmazon

Fuel system

1 required

3890433Fuel filter$34.97eBay

Oil system

1 required

3890434Oil filter$30.97PartsGeek

Cooling system

1 required

1195148Coolantsee priceeBay

Electrical

1 required

7L7871Batterysee priceeBay

Prices captured from merchant listings; some links are affiliate links. Confirm against your serial number before ordering.

Specifications

Fuel	Diesel
Frequency	60.0 Hz
Standby power	650 kW
Standby kVA	813
Prime power	910 kW
Emissions	EPA Tier 2
Controller	EMCP 3.1, EMCP 3.2, EMCP 3.3
Oil capacity	16.103 L
Alternator	SR4B (4-pole)
Voltage options	480 V
Phase	3-phase
Rated current	2405.6 A
Power factor	0.8
Circuit breaker	3000 A
Battery group	24
Battery voltage	DC V
Battery quantity	1
Coolant capacity	390.8 L
Max ambient	40 °C
Dimensions (L×W×H)	6452×2324×2711 mm
Dry weight	15926 kg
Sound level	72.0 dBA @ 15 m
Fuel tank	4730.0 L
Tank runtime	23.5 hr

Engine

Caterpillar C27 TA

Oil capacity	68.0 L
Coolant capacity	55.0 L
Displacement	27.03 L
Aspiration	TA
Rated speed	1800 rpm

Filters for the Caterpillar C27 TA

Engine-mounted filters the filter manufacturers list for this engine family. These come from the engine, not from this generator set’s own parts list, so confirm against your serial number before ordering.

System	Filter	Description	Cross-references
Oil filter	P551808	Lube Filter, Spin-On Full Flow	CATERPILLAR 1R1808, CATERPILLAR 1R808, NAPA 7792, BALDWIN B7299	KuduParts $80.00
Oil filter	P554005	Lube Filter, Spin-On Full Flow	CATERPILLAR 1R0716, CATERPILLAR 1W2660, NAPA 1792, BALDWIN BF46150-O	FridayParts $41.73
Fuel filter	P551316	Fuel Filter, Spin-On	CATERPILLAR 1R0755, CATERPILLAR 3890433, NAPA 3685, BALDWIN BF7639	KuduParts $54.00 FridayParts $55.99
Fuel filter	P551311	Fuel Filter, Spin-On Secondary	CATERPILLAR 1R0749, CATERPILLAR 3089679, BALDWIN BF7587, TAMROCK 019854051	KuduParts $147.00 FridayParts $151.84

Listed for this engine in only one kind of machine, so they may depend on how the engine was installed:

System	Filter	Description	Cross-references
Fuel / water separator	P551858	Fuel Filter, Water Separator Spin-On	CATERPILLAR 1335673, CATERPILLAR 1700061, NAPA 3780, BALDWIN BF1265	FridayParts $39.00 KuduParts $48.00
Coolant filter	P554685	Coolant Filter, Spin-On Non-Chemical	CATERPILLAR 3I1300, CATERPILLAR 4059558, NAPA 4070, MTU 0002040791	buy

Maintenance & consumables

for the Caterpillar C27 TA

Item	Spec	Capacity	Part #	Interval
Air filter	Air Shutoff		101564109		Amazon eBay
Fuel filter			3890433	1250 hr	Amazon eBay $34.97 FridayParts $71.99
Oil filter			3890434	1250 hr	Amazon eBay $82.42 PartsGeek $30.97 NAPA $45.70
Battery	24V wet, 1125 CCA, group 31		7L7871		eBay
Belt			—	1250 hr
Coolant	Extended Life Coolant (ELC)	138.0 L	1195148		eBay
Oil		68.0 L	—
Spark plug			—	1250 hr

Service intervals

Item	Action	Hours	Months	Notes
Aftercooler Core	Clean	250 hr		Every 9500 L (2500 US gal) of Fuel or 250 Service Hours or Yearly (Prime Power); Clean/Test
Alternator and Fan Belts	Inspect	250 hr		Every 9500 L (2500 US gal) of Fuel or 250 Service Hours or Yearly (Prime Power); Every Year (Standby); Inspect/Adjust/Replace
Battery Electrolyte Level	Check	250 hr		Every 9500 L (2500 US gal) of Fuel or 250 Service Hours or Yearly (Prime Power); Every Week (Standby)
Cooling System Supplemental Coolant Additive (SCA)	Test	250 hr		Every 9500 L (2500 US gal) of Fuel or 250 Service Hours or Yearly (Prime Power); Every Year (Standby); Test/Add
Cylinder Head Grounding Stud	Inspect	250 hr		Every 9500 L (2500 US gal) of Fuel or 250 Service Hours or Yearly (Prime Power); Every 3 Years (Standby); Inspect/Clean/Tighten
Engine Crankcase Breather	Clean	250 hr		Every 9500 L (2500 US gal) of Fuel or 250 Service Hours or Yearly (Prime Power); Every Year (Standby)
Engine Oil Sample	Other	250 hr		Obtain; Every 9500 L (2500 US gal) of Fuel or 250 Service Hours or Yearly (Prime Power); Every Year (Standby)
Engine Oil and Filter	Change	250 hr		Every 9500 L (2500 US gal) of Fuel or 250 Service Hours or Yearly (Prime Power); Every Year (Standby)
Engine Protective Devices	Check	250 hr		Every 9500 L (2500 US gal) of Fuel or 250 Service Hours or Yearly (Prime Power); Every Year (Standby)
Engine Valve Lash	Inspect	3000 hr		First service — First 9500 L (2500 US gal) of Fuel or 250 Service Hours (Prime Power); Inspect/Adjust
Fan Drive Bearing	Lubricate	250 hr		Every 9500 L (2500 US gal) of Fuel or 250 Service Hours or Yearly (Prime Power); Every Year (Standby)
Fuel System Secondary Filter	Replace	250 hr		Every 9500 L (2500 US gal) of Fuel or 250 Service Hours or Yearly (Prime Power); Every Year (Standby)
Fuel Tank Water and Sediment	Drain	250 hr		Every 9500 L (2500 US gal) of Fuel or 250 Service Hours or Yearly (Prime Power); Every Week (Standby)
Hoses and Clamps	Inspect	250 hr		Every 9500 L (2500 US gal) of Fuel or 250 Service Hours or Yearly (Prime Power); Every Year (Standby); Inspect/Replace
Magnetic Pickups	Clean	250 hr		Every 9500 L (2500 US gal) of Fuel or 250 Service Hours or Yearly (Prime Power); Clean/Inspect
Radiator	Clean	250 hr		Every 9500 L (2500 US gal) of Fuel or 250 Service Hours or Yearly (Prime Power); Every Year (Standby)
Rotating Rectifier	Check	7500 hr	12 mo	Every 9500 L (2500 US gal) of Fuel or 250 Service Hours or Yearly (Prime Power); Every 3 Years (Standby)
Fuel System Primary Filter (Water Separator) Element	Replace	500 hr		Every 19 000 L (5000 US gal) of Fuel or 500 Service Hours (Prime Power); Every Year (Standby)
Alternator	Inspect	3000 hr		Every 114 000 L (30 000 US gal) of Fuel or 3000 Service Hours or 2 Years (Prime Power); Every Year (Standby)
Cooling System Coolant (DEAC)	Change	3000 hr		Every 114 000 L (30 000 US gal) of Fuel or 3000 Service Hours or 3 Years (Prime Power); Every 3 Years (Standby)
Cooling System Coolant Extender (ELC)	Other	3000 hr		Add; Every 114 000 L (30 000 US gal) of Fuel or 3000 Service Hours or 3 Years (Prime Power); Every 3 Years (Standby)
Cooling System Water Temperature Regulator	Replace	3000 hr		Every 114 000 L (30 000 US gal) of Fuel or 3000 Service Hours or 3 Years (Prime Power); Every 3 Years (Standby)
Crankshaft Vibration Damper	Inspect	3000 hr		Every 114 000 L (30 000 US gal) of Fuel or 3000 Service Hours or 2 Years (Prime Power); Every Year (Standby)
Engine Mounts	Inspect	3000 hr		Every 114 000 L (30 000 US gal) of Fuel or 3000 Service Hours or 3 Years (Prime Power); Every Year (Standby)
Engine Speed/Timing Sensors	Check	3000 hr		Every 114 000 L (30 000 US gal) of Fuel or 3000 Service Hours or 3 Years (Prime Power); Every 3 Years (Standby); Check/Clean/Calibrate
Engine Valve Rotators	Inspect	3000 hr		Every 114 000 L (30 000 US gal) of Fuel or 3000 Service Hours or 3 Years (Prime Power); Every Year (Standby)
Starting Motor	Inspect	3000 hr		Every 114 000 L (30 000 US gal) of Fuel or 3000 Service Hours or 3 Years (Prime Power); Every Year (Standby)
Turbocharger	Inspect	3000 hr		Every 114 000 L (30 000 US gal) of Fuel or 3000 Service Hours or 3 Years (Prime Power); Every 3 Years (Standby)
Water Pump	Inspect	3000 hr		Every 114 000 L (30 000 US gal) of Fuel or 3000 Service Hours or 3 Years (Prime Power); Every Year (Standby)
Insulation	Test	7500 hr	12 mo	Every 7500 Service Hours or 1 Year (Standard and Standby schedule)
Cooling System Coolant (ELC)	Change	12000 hr		Every 228 000 L (60 000 US gal) of Fuel or 12 000 Service Hours or 6 Years (Prime Power); Every 6 Years (Standby)
Bearing (Ball)	Lubricate	2000 hr	12 mo	Every Year (Standby schedule)
Bearing (Spherical Roller)	Lubricate	1000 hr	12 mo	Every Year (Standby schedule)
Generator Set Vibration	Inspect	2000 hr	12 mo	Every Year (Standby schedule)
Stator Lead	Check	2000 hr	6 mo	Every 6 Months (Standby schedule)

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	Bearing bracket step minimum	less than 0.0762	mm
Clearance	Coolant level below bottom of filler pipe	13	mm	engine stopped and cool
Clearance	Fan and alternator belt deflection	13 to 19	mm	110 N (25 lb) force midway between pulleys
Other	High idle speed for droop governors	approximately 2% to 5%	above full load speed	governors equipped with droop
Other	SCA concentration in glycol/water mixture	3 to 6	percent	glycol and water
Other	SCA concentration in water-only mixture	6 to 8	percent	water and SCA
Other	Speed droop values commonly used	3% and 0%	%
Other	Voltage droop for 0.8 power factor load	approximately 5	%	loads with a power factor of 0.8
Pressure	Engine oil pressure at low idle	186 to 344	kPa	low idle speed
Pressure	Engine oil pressure at rated engine speed	275 to 606	kPa	at rated engine speed
Pressure	Engine oil pressure at rated engine speed	40 to 88	psi	at rated engine speed
Pressure	Maximum air pressure for cleaning	205	kPa	cleaning purposes
Pressure	Maximum water pressure for cleaning	275	kPa	cleaning purposes
Pressure	Normal operating engine oil pressure	275 to 600	kPa	engine running at rated engine speed, SAE 10W30 oil, operating oil temperature 104 C (219.2 F), normal engine water temperature
Resistance	Exciter Armature (Rotor) (L2) resistance	less than 0.1	ohm	room temperature
Resistance	Exciter Armature (Rotor) (L2) winding resistance	less than 0.1	ohm	room temperature
Resistance	Exciter Field (Stator) (L1) resistance	3.0 to 6.0	ohms	room temperature
Resistance	Exciter Field (Stator) (L1) winding resistance	3.0 to 6.0	ohm	room temperature
Resistance	Insulation resistance minimum for other windings	100,000	ohms	drying decision
Resistance	Insulation resistance minimum for stator	1	megohm	drying decision
Resistance	Main Armature (Stator) (L4) resistance	less than 0.1	ohm	room temperature
Resistance	Main Field (Rotor) (L3) resistance	0.75 to 2.0	ohms	room temperature
Resistance	Main Field (Rotor) (L3) winding resistance	0.75 to 2.0	ohm	room temperature
Resistance	Main armature (Stator) (L4) winding resistance	less than 0.1	ohm	room temperature
Resistance	Pilot Exciter Armature (L5) resistance	less than 0.1	ohm	room temperature
Resistance	Pilot Exciter Armature (L5) winding resistance	less than 0.1	ohm	room temperature
Resistance	Resistor (R5) resistance	27000	ohm	nominal ± 2700 ohms
Resistance	Varistor (CR7) resistance	15000	ohm	minimum
Resistance	Varistor (CR7) resistance	minimum 15000	ohms
Speed	Frequency vs RPM - four-pole generator	divide the RPM by 30	Hz
Speed	Frequency vs RPM - six pole generator	divide the RPM by 20	Hz
Speed	Low idle (50 Hz units)	approximately 80	% of full load speed	50 Hz units
Speed	Low idle (60 Hz units)	approximately 66	% of full load speed	60 Hz units
Temperature	Bearing installation heating	149	C	for press fit installation
Temperature	Bearing reinstall heating	107	C	heat for ten minutes
Temperature	Bearing temperature shutdown threshold above ambient	50	°C	above ambient
Temperature	Coupling installation heating	315	C	for press fit installation
Temperature	Engine coolant temperature typical range	87 to 98	°C
Temperature	Engine water temperature operating range	88 to 100	C	88 C (190.4 F) to 100 C (212.0 F)
Temperature	Generator drying temperature (oven method)	65	C	forced air oven for 4 hours
Temperature	Generator drying winding temperature rise rate	10	C per hour up to 85 C (185 F)	do not apply heat too rapidly
Temperature	Hub reinstall heating	400	C	heat for three hours
Temperature	Maximum allowable coolant temperature with pressurized cooling system	107	°C	pressurized cooling system
Temperature	Maximum exhaust temperature	575	°C
Temperature	Maximum oil temperature at rated speed with full load	107	°C	rated speed, full load
Temperature	Oven drying method temperature	65	C	forced air drying oven for four hours
Temperature	Winding temperature limit during drying	85	C	maximum to prevent insulation damage
Torque	Air cleaner service indicator	18	lb in	install
Torque	Air cleaner service indicator	2	N·m	install
Torque	Exciter armature bolt (3/8 inch)	55.8	N·m	with thread lock 9S-3263
Torque	Exciter armature bolt (5/16 inch)	35.4	N·m	with thread lock 9S-3263
Voltage	Generator set functional test minimum phase voltage	minimum 85	VAC	generator set operated at half the rated speed with 12 VDC battery on F1+/F2-
Voltage	Insulation test voltage for units 600 V or less	500	V	insulation test
Voltage	Insulation test voltage for units 600 volts or less	500	Volts	600 volts or less
Voltage	Insulation test voltage for units more than 600 V	1000	V	insulation test
Voltage	Insulation test voltage for units more than 600 volts	1000	Volts	more than 600 volts

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	Cat DEAC				Diesel; 3,000 Service Hours or Three Years; annual S·O·SSM Level 2 coolant sampling and analysis
Coolant	Cat DEAC (Diesel Engine Antifreeze/Coolant)	ASTM D4985 or ASTM D5345		22.7 L	Acceptable
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 ELC (Extended Life Coolant)	Caterpillar EC-1		22.7 L	Preferred; engine only capacity; 1:1 water and glycol recommended
Coolant	Cat NGEC				Natural Gas; 16,000 Service Hours or Three Years; use interval that occurs first
Engine oil	Cat NGEO				Natural Gas
Engine oil	SAE 10W30				Referenced as the oil used when normal operating engine oil pressure is specified
Engine oil	Cat Arctic DEO SYN SAE 0W-30		-40°C to 30°C		Engine Crankcase; Industrial Engines
Engine oil	SAE 0W-20		-40°C to 10°C		Cat DEO or equivalent
Engine oil	SAE 0W-30		-40°C to 30°C
Engine oil	SAE 0W-40		-40°C to 40°C
Engine oil	Cat DEO SYN SAE 5W-40		-30°C to 50°C		Engine Crankcase; Industrial Engines
Engine oil	SAE 5W-30		-30°C to 30°C
Engine oil	SAE 5W-40		-30°C to 50°C
Engine oil	Cat DEO SAE 10W-30		-18°C to 40°C		Engine Crankcase; Industrial Engines
Engine oil	SAE 10W-30		-18°C to 40°C		Cat DEO (Diesel Engine Oil) 10W-30
Engine oil	SAE 10W-40		-18°C to 50°C
Engine oil	Cat DEO SAE 15W-40		-9°C to 50°C		Engine Crankcase; Industrial Engines
Engine oil	SAE 15W-40		-9°C to 50°C		Cat DEO (Diesel Engine Oil) 15W-40
Fuel	No. 1-D or No. 2-D diesel	ASTM D975			No. 1 or blend best for cold weather
Grease	Cat Generator Set Grease				Part Number 108-8611
Grease	MPGM or Bearing Lubricant				Fan drive bearing and battery terminals
Grease	NLGI No. 1.5 Grade				Caterpillar 108-8611 Grease Cartridge for spherical roller bearings; contains Clay thickener; no molybdenum disulfide; viscosity 32 cSt at 40 C, 5 cSt at 100 C
Grease	NLGI No. 2 Grade		-29°C to 177°C		Caterpillar 2S-3230 Bearing Lubricant for ball bearings; contains Polyurea thickener; for extremely low temperatures use NLGI No. 1 Grade or NLGI No. 0 Grade

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

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

Procedures

Adjustments for Generators in Parallel Operation adjustment

Connect current transformer to S1 and S2 of J2.
Set P1 quadrature droop to center.
Apply rated load; voltage should drop 2 to 3%.
Set no-load voltages identical for all generators.
Connect generators in parallel and adjust speed for 0 kW exchange.
Minimize circulating currents with P2 or Rhe.
Apply available load; equalize kW by altering speed.
Alter P1 to equalize currents.

Adjustments for Stand-alone Generators (R448) adjustment

Tools: Analog voltmeter, Voltmeter 300-500 VAC or 1000 VAC

Turn remote adjustment potentiometer to center.
Connect analog voltmeter 100 VDC to E+ and E-.
Connect voltmeter 300-500 VAC or 1000 VAC to generator output.
Set ST3 wire for desired frequency.
Turn P2 full counterclockwise.
Turn P4 full clockwise.
Turn stability P3 counterclockwise about 1/3.
Start engine and set 48 Hz for 50 Hz or 58 Hz for 60 Hz.
Adjust output voltage with P2.
Check LAM operation, ST5 closed.
Turn P4 slowly counterclockwise until voltage drop.
Vary frequency around 48 or 58 Hz and check voltage.

R448 Adjustment for Maximum Excitation adjustment

Tools: 10 Amp DC ammeter

Disconnect power supply wires X1, X2, Z1, Z2.
Disconnect sensing leads 0V, 110V, 220V, 380V.
Connect 200V-240V main power supply to X1 and X2.
Install 10 Amp DC ammeter in series with exciter field.
Turn P5 full counterclockwise and activate power supply.
Turn P2 clockwise until stable current.
Switch power off then on. Turn P5 to required maximum current.
Maximum current must not exceed 10 Amperes.

VR3 Regulator Adjustment Procedure adjustment

⚠ The VR3 regulator is protected by a fuse(s) and a solid-state overcurrent protection. If a fuse becomes open, contact a Caterpillar dealer.

Remove the access panel of the generator.
Loosen the locknut on the voltage droop potentiometer (1).
Remove the protective screw from the voltage level potentiometer (2) and from the voltage gain potentiometer (3).
Turn the voltage droop potentiometer (1) counterclockwise to zero droop. Tighten the locknut.
Turn the voltage gain potentiometer (3) counterclockwise to zero, then to about 1/4 of full range of clockwise travel.
Perform required maintenance on the engine before you start the engine.
Start the engine and allow the engine to warm up.
Increase engine speed to full governed rated speed (high idle).
Set the no-load voltage with the voltage level potentiometer (2) or the voltage adjust rheostat.
Close the load circuit breaker and apply full load gradually. Adjust governor control to nameplate frequency or rated speed.
If the voltmeter reading increases above no-load voltage, turn the voltage gain potentiometer counterclockwise. If it decreases, turn it clockwise.
Remove the load. If necessary, adjust the voltage level potentiometer (2) to obtain desired voltage.
Apply the load. Repeat Steps 10 through 12 until the voltage at no load equals the voltage at full load.
Tighten the locknuts. Install the protective screws and the access panel of the generator.

Generator Set Functional Test diagnostic

⚠ Do not exceed half rated speed

⚠ Do not allow output to exceed nameplate rating

Tools: Digital Multimeter, 12 VDC Battery

Disconnect wires F1 and F2 from voltage regulator
Disconnect generator load
Connect 12 VDC battery to wires F1+ and F2-
Operate generator at half rated speed
Measure AC voltage across terminals T1-T2, T1-T3, T2-T3
Record voltages at half speed, then at ±10% speed variations
Verify minimum 85 VAC output at half speed
Verify speed changes produce proportional voltage changes

Insulation - Test diagnostic

⚠ Electrocution hazard

Tools: 142-5055 Insulation Testing Gp, 9U-6003 Insulation Testing Gp

Take generator out of service.
Visually inspect for moisture; dry if present.
Discharge winding capacitance.
Isolate stator windings.
Connect insulation tester RED lead to ground.
Connect BLACK lead to wye point.
Set voltage to 500 V for 600 V or less, 1000 V for more than 600 V.
Apply voltage and observe readings at 30 and 60 seconds.
Record 60 second reading, temperature, humidity.
Remove voltage and evaluate reading.

Rotating Rectifier - Test diagnostic

⚠ High voltage hazard

Tools: 12 volt battery, Rheostat 50 Ohms 300 Watts, Diode, Diode bridge, Variable power supply

Stop generator set and disconnect AVR wires.
Make separate excitation assembly with 12 V battery or variable DC supply.
Connect 12 V battery in series with 50 Ohm 300 Watt rheostat and diode.
Or connect variable power supply and diode bridge.
Operate generator at rated speed.
Gradually increase exciter field current.
Measure output voltage and current at no load.
Generator is proper if output voltage is rated and balanced within one percent.

Rotating Rectifier Block Diode Test diagnostic

⚠ Shorted diode can damage exciter rotor

Tools: Digital Multimeter 6V-7070

Set digital multimeter to diode range and remove all leads
Test forward bias on each diode (black to positive, red to AC terminals)
Verify readings between 0.4 and 1.0
Test reverse bias (red to positive, black to AC terminals)
Verify overload (OL) readings on reverse bias
Replace rectifier block if any reading is outside specifications

Varistor - Test diagnostic

Tools: Ohmmeter, Test Light

Using an ohmmeter, place the ohmmeter across the varistor. The resistance should be a minimum of 15000 ohms.
Disconnect either lead of the varistor (CR7).
Place the test light across the varistor.
Observe the results. The lamp should not light.
Reverse the test light.
Observe the results. The lamp should not light.
If the test light illuminates in either direction, there is a short in the varistor. Replace any faulty varistors with comparable operating characteristics.

Winding Resistance Measurement diagnostic

⚠ Temperature affects resistance; test at room temperature only

⚠ Winding damage if outside specifications

Tools: Digital Multimeter, Milliohmmeter (Wheatstone Bridge)

Disconnect winding from other components before measuring
Measure armature windings with milliohmmeter (L2, L4, L5)
Measure field windings with multimeter (L1, L3)
Test at room temperature only
Compare measurements to specification values
Verify no continuity between windings or between winding and ground

Lead to Lead Connection installation

Tools: Varnished cambric tape 5N-4685, Vinyl plastic tape 5N-4686, Cable straps

Fasten leads using flat plated washer under bolt and nut
Apply two layers of varnished cambric high voltage tape
Overlap tape 50% of width while wrapping
Extend tape 25 mm onto wire insulation on each side
Apply two layers of vinyl plastic tape over cambric tape
Extend vinyl tape 51 mm onto wire insulation on each side
Group all phase leads and secure with cable straps

Leads to Terminal Strip Connection installation

Tools: Flat plated washers, Cable straps

When multiple leads attach to bus bar, place on alternate sides
Use flat plated washers under bolt head and nut
Group all generator phase leads together after connection
Tie phase leads together with cable straps
Maintain minimum 25 mm clearance between phase-to-phase connections

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
	3	Delta - 6 lead	6	Winding pitch must be two-thirds or the generator must be derated.
	3	Wye - 10 lead (high voltage)	10	Illustration 13. Only used on 3306B generator sets and 3406C generator sets. Terminal T0 is the neutral lead.
	3	Wye - 10 lead (low voltage)	10	Only used on 3306B and 3406C generator sets. Terminal T0 is the neutral lead.
	3	Wye - 12 lead (high voltage)	12	Terminals T10, T11, and T12 become neutral connections when tied together.
	3	Wye - 12 lead (low voltage)	12	Terminals T10, T11, and T12 become neutral connections when tied together.
	3	Wye - 4 lead	4	Only used on 3306B generator sets and 3406C generator sets. Terminal T0 is the neutral lead.
	3	Wye - 6 lead	6	Terminals T4, T5, and T6 become neutral connections when the terminals are tied together.
190-220 (50 Hz), 190-240 (60 Hz)	3	Wiring Code A	12 wire	Winding 6; 5000/6100/7000 12 wire factory connection
240	3	Delta - 12 lead	12	Terminals T6 and T9 become the neutral connections when tied together and grounded. T2 and T10 connection is the high phase. 240 V, 60 Hz, three-phase: 208 Volts between the high phase and neutral; 240 Volts between either of the low phases and neutral.
380-415 (50 Hz), 380-480 (60 Hz)	3	Wiring Code D	12 wire	Winding 6; 5000 12 wire factory connection
480	3	Parallel Wye	12 lead	Typical high voltage connection
480	3	Series Wye	12 lead	Typical high voltage connection
480	3	Wye	6 lead	Typical Wye Configuration
58% of three-phase connected voltage	1	Wye	any phase lead and neutral	Single-phase from three-phase generator
600	3	Wiring Code D	12 wire	Winding 9; R448 voltage sensing and transformer
Four Lead Wye	Three-phase	T1/T2/T3 to loads, T0 to neutral	T1, T2, T3, T0	Regulator leads 22, 24, 20 from T1, T2, T3 respectively
Six Lead Delta	Three-phase	T1/T6, T2/T4, T3/T5 series loop connections	T1, T2, T3, T4, T5, T6	Delta configuration
Six Lead Wye	Three-phase	T1/T2/T3 to loads, T4/T5/T6 to neutral	T1, T2, T3, T4, T5, T6	Regulator sensing from T1, T2, T3
Ten Lead Wye High Voltage	Three-phase	T1/T2/T3 to loads with T4/T7, T5/T8, T6/T9 series connections	T1, T2, T3, T4, T5, T6, T7, T8, T9, T0	High voltage configuration
Ten Lead Wye Low Voltage	Three-phase	T1/T7, T2/T8, T3/T9 parallel connections	T1, T2, T3, T4, T5, T6, T7, T8, T9, T0	Low voltage configuration
Twelve Lead Delta	Three-phase	T1/T12, T2/T10, T3/T11 series loops with jumpers	T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12	Delta configuration with 12 leads
Twelve Lead Wye High Voltage	Three-phase	T1/T2/T3 to loads with series connections	T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12	High voltage configuration with 12 leads
Twelve Lead Wye Low Voltage	Three-phase	T1/T7, T2/T8, T3/T9 parallel connections	T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12	Low voltage configuration with 12 leads

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 Caterpillar SR4B?

The Caterpillar SR4B is rated 650 kW standby (813.0 kVA).

What engine is in the Caterpillar SR4B?

The Caterpillar SR4B is powered by the Caterpillar C27 TA engine.

What fuel does the Caterpillar SR4B use?

The Caterpillar SR4B runs on Diesel.

What is the oil capacity of the Caterpillar SR4B?

The Caterpillar C27 TA engine in the Caterpillar SR4B has an oil capacity of 68.0 liters.

What is the coolant capacity of the Caterpillar SR4B?

The Caterpillar SR4B cooling system holds 390.8 liters (103.2 US gallons) for the radiator system including the engine, per the manufacturer specification sheet.

What is the continuous rating of the Caterpillar SR4B?

The Caterpillar SR4B is rated 910 kW prime (1137 kVA), against 650 kW standby.

What is the sound level of the Caterpillar SR4B?

The Caterpillar SR4B is rated at 72.0 dBA at 15 m, per the manufacturer specification sheet.

How much does the Caterpillar SR4B weigh?

The Caterpillar SR4B has a dry weight of 15926 kg (35110 lb).

What size fuel tank does the Caterpillar SR4B have?

The Caterpillar SR4B has a 4730 liter (1250 US gallon) fuel tank, giving about 23.5 hours of runtime.

What voltages is the Caterpillar SR4B available in?

The Caterpillar SR4B is offered in 480 V, 3-phase-phase.

How many cold cranking amps does the Caterpillar SR4B require?

The Caterpillar SR4B uses 1 battery, DC V each, group 24, per the manufacturer specification sheet.

Which alternator is fitted to the Caterpillar SR4B?

The Caterpillar SR4B uses a SR4B alternator. It has 4 poles.

What oil filter does the Caterpillar SR4B use?

The Caterpillar SR4B uses oil filter part number 3890434.

What fuel filter does the Caterpillar SR4B use?

The Caterpillar SR4B uses fuel filter part number 3890433.

What air filter does the Caterpillar SR4B use?

The Caterpillar SR4B uses air filter part number 101564109.

Troubleshooting

Symptoms & remedies

Symptom	Cause	Remedy
Low Oil Pressure — The engine oil pressure drops below the setpoints for low oil pressure shutdown that are programmed into the GSC; the low oil pressure indicator FLASHES, and the engine is shut down; the engine is not allowed to start until the fault is corrected	The engine oil pressure drops below the setpoints for low oil pressure shutdown that are programmed into the GSC	Correct the fault; the engine is not allowed to start until the fault is corrected
Emergency Stop — The operator presses the emergency stop push button (ESPB) on the front panel; the emergency stop indicator FLASHES and the engine is shut down; the engine is not allowed to start until the condition is corrected	The operator presses the emergency stop push button (ESPB) on the front panel	Correct the condition; the engine is not allowed to start until the condition is corrected
High Water Temperature — The engine coolant temperature rises above the setpoint for high water temperature shutdown that is programmed into the GSC; the high water temperature indicator FLASHES; the engine is shutdown and the engine is not allowed to start until the fault is corrected	The engine coolant temperature rises above the setpoint for high water temperature shutdown that is programmed into the GSC	Correct the fault; the engine is not allowed to start until the fault is corrected
Engine Overspeed — The engine speed exceeds the setpoint for engine overspeed that is programmed into the GSC; the engine overspeed indicator FLASHES; the engine is shutdown and the engine is not allowed to start until the fault is corrected	The engine speed exceeds the setpoint for engine overspeed that is programmed into the GSC	Correct the fault; the engine is not allowed to start until the fault is corrected
Low Coolant Level — The engine coolant level drops below the probe of the coolant loss sensor; the engine coolant level indicator FLASHES; the engine is shut down; the engine is not allowed to start until the fault is corrected	The engine coolant level drops below the probe of the coolant loss sensor	Correct the fault; the engine is not allowed to start until the fault is corrected
Overcrank — The engine does not start within the setpoint for total cycle crank time that is programmed into the GSC; the overcrank indicator FLASHES; the engine is not allowed to start until the fault is corrected	The engine does not start within the setpoint for total cycle crank time that is programmed into the GSC	Correct the fault; the engine is not allowed to start until the fault is corrected

Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing. Full Caterpillar SR4B troubleshooting guide (15 entries) →

Parts

Part #	Description	Qty	System
101564109	Air Shutoff		Air filter	Amazon eBay
1195148	COOLANT-LONG LIFE-BULK-1 LITER	1	Fluid	eBay
1R-0762	Fuel Secondary - ADV	2	Fuel filter	Amazon eBay $33.99 eBay $34.95 NAPA $43.65 FridayParts $30.63
1R-0770	Fuel/Water Separator	1	Fuel filter	eBay $38.77 NAPA $57.83 KuduParts $22.00 FridayParts $24.00 SinoCMP $65.00
1R-1808	Engine Oil - ADV	1	Oil filter	Amazon eBay $141.00 eBay $59.99 NAPA $45.70 NAPA $45.70 KuduParts $80.00 FridayParts $81.99
1U-5490	Hydrosolv 4165 liquid cleaner, 19 L (5 US gallon)		Fluid	Amazon eBay
3690804	ADDITIVE-COOLANT	2	Fluid	eBay $19.67
4350408	CLEANER GP-AIR-D	1	Air filter	eBay
4471546	TRANSFORMER GP-CURRENT	1	Sensor	eBay
5N-5561	Silicone Lubricant		Fluid	Amazon eBay
5N9597	VOLTAGE INDICATOR 480V, 60HZ	1	Sensor	eBay
ACL0017	STANDARD AIR CLEANER 17	1	Air filter	eBay
COOL001	155L EXTENDED LIFE COOLANT	1	Fluid	eBay
CT20006	CT 2000:5 RATIO	1	Sensor	eBay
JWH0241	JW HEATER - SINGLE W/PUMP 60HZ	1	Pump	eBay
LF4811	P FRAME / R FRAME DC REGULATOR	1	Avr	eBay
LF5341	JWH W/ PUMP - 60HZ	1	Pump	eBay
LF9848	IVR-EM10A	1	Avr	eBay
LS0328	ELECTRIC STARTING MOTOR-HEAVY	1	Starter	eBay
LS0332	LONG LIFE COOLANT	1	Fluid	eBay
M-3675181	Piston		Piston	Amazon eBay
M-3758261	Piston		Piston	Amazon eBay
M-4599781	Gasket Set - Oil Cooler & Lines		Gasket	Amazon eBay
M-CK3675181P	Cylinder Kit		Cylinder kit	Amazon eBay
M-CK3758261P	Cylinder Kit		Cylinder kit	Amazon eBay
01908191	Overspeed		Service part / kit	Amazon eBay
101147116	Engine Operation with Active Diagnostic Codes		Service part / kit	Amazon eBay
101154196	Engine Operation with Intermittent Diagnostic Codes		Service part / kit	Amazon eBay
101233590	Before Starting Engine		Service part / kit	Amazon eBay
101446865	Diagnostic Lamp		Service part / kit	Amazon eBay
101646248	After Starting Engine		Service part / kit	Amazon eBay
102308903	Starting with Jump Start Cables		Service part / kit	Amazon eBay
102327037	Starting the Engine (EMCP II and EMCP II+ (If Equipped))		Service part / kit	Amazon eBay
102512380	Fault Logging		Service part / kit	Amazon eBay
130-3786	Control Panel	1	Service part / kit	Amazon eBay
1535710	BATTERY-WET	2	Service part / kit	Amazon eBay $299.97 eBay
174-6854	Hydrosolv 100 liquid cleaner, 19 L (5 US gallon)		Service part / kit	Amazon eBay NAPA $10.64
2323232	Connecting rod		Service part / kit	eBay $201.50
2613291	MOTOR GP-ELECSTG	1	Service part / kit	eBay
301108737	Cold Weather Starting		Service part / kit	Amazon eBay
3395996	CHARGER-BATTERY	1	Service part / kit	eBay
4864557	HEATER GP-GEN	1	Service part / kit	eBay
5770040	HEATER GP-JW BSC	1	Service part / kit	eBay
5N-4478	Coupling plate assembly	1	Service part / kit	eBay
5N-4479	Shim 0.8 mm for coupling plate	6	Service part / kit	eBay $32.86
5N-4685	Varnished cambric tape 15000V	1	Service part / kit	eBay $66.33
5N-4686	Vinyl plastic electrical tape	1	Service part / kit	eBay $21.75
7L7871	24 VOLT BATTERY SET / BATTERY GP	1	Service part / kit	eBay
7L7872	24 VOLT BATTERY SET	1	Service part / kit	eBay
9S-3263	Thread lock	1	Service part / kit	eBay $30.78
BAT2429	ENCLO BATT 24V WET 1400CCA 29	1	Service part / kit	eBay
BTC1038	ENCLOSURE BATT CHARGER 10A	1	Service part / kit	eBay
CR1-CR6	Diodes in bridge rectifier circuit	6	Service part / kit	Amazon eBay
ELSM248	ELEC. START MOTOR HEAVY DUTY	1	Service part / kit	eBay
LF3239	SERIES WIRED SPACE HEATERS	1	Service part / kit	eBay
LS1230	ENCLOSURE HVY DUTY BATTERY SET	1	Service part / kit	eBay
R-20R2284	C15/C18/C27/C32 ACERT Trim file (12-digit serial)	1	Service part / kit	Amazon eBay
R-20R2285	C15/C18/C27/C32 ACERT Trim file (12-digit serial)	1	Service part / kit	Amazon eBay
SHK0022	SPACE HEATER 1400S FRAME	1	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.

Fuel consumption

Rating	Load	L/h	gal/h
Prime		136.5	36.1
Prime	50%	185.0	48.9
Prime	75%	262.5	69.3
Prime	100%	374.8	98.9
Standby		188.2	49.7
Standby	50%	122.2	32.3
Standby	75%	171.6	45.3
Standby	100%	216.6	57.2

Available documents

Spec sheet — 1586422-Generator-Data (Caterpillar)Spec sheet — 3512C1230ekWContTier2 HV60HzUS (Caterpillar)Spec sheet — 3512C1500ekwStandby-HVTier2 (Caterpillar)Spec sheet — C27650ekwStandbyLowBSFC NR (Caterpillar)Spec sheet — C27650ekwStandbyTier2 NR (Caterpillar)Spec sheet — C27700ekwStandbyLowBSFC NR (Caterpillar)Spec sheet — C27800ekwStandbyLowBSFC NR (Caterpillar)Spec sheet — C27800ekwStandbyTier2 NR (Caterpillar)Spec sheet — SR4 Spec (Caterpillar)Spec sheet — XQ1000 LEHE6385-04 (Caterpillar)Owner's manual — 3456 Operation and Maintenanace Manual (Caterpillar)Owner's manual — OMM SR4 B SEBU6918-03 (Caterpillar)Owner's manual — SEBU7050 (Caterpillar)Parts manual — Caterpillar Engines (Caterpillar)Parts manual — SR4 Rewind Data (Caterpillar)Service manual — SR4 Generator Service Manual (Caterpillar)

This page was generated from the 16 manufacturer documents above by automated extraction; every figure shown is copied from one of them. How the data is compiled.

Caterpillar SR4B Generator Set

Service parts for the SR4B

Air intake

Fuel system

Oil system

Cooling system

Electrical

Specifications

Engine

Filters for the Caterpillar C27 TA

Maintenance & consumables

Service intervals

Service specifications

Recommended fluids

Fault codes

Procedures

Voltage reconnection

Common questions

Troubleshooting

Symptoms & remedies

Repair guides

Parts

Fuel consumption

Available documents

Code	Name	Meaning
01-05	Injector Cylinder 1 Open Circuit	Injector Cylinder 1 Open Circuit
01-06	Injector Cylinder 1 Short	Injector Cylinder 1 Short
02-06	Injector Cylinder 2 Short	Injector Cylinder 2 Short
03-05	Injector Cylinder 3 Open Circuit	Injector Cylinder 3 Open Circuit
04-05	Injector Cylinder 4 Open Circuit	Injector Cylinder 4 Open Circuit
04-06	Injector Cylinder 4 Short	Injector Cylinder 4 Short
05-06	Injector Cylinder 5 Short	Injector Cylinder 5 Short
06-05	Injector Cylinder 6 Open Circuit	Injector Cylinder 6 Open Circuit
91-08	Throttle Position Signal Abnormal	Throttle Position Signal Abnormal
100-03	Engine Oil Pressure Open/Short to +Batt	Engine Oil Pressure Open/Short to +Batt
100-04	Engine Oil Pressure Short To Ground	Engine Oil Pressure Short To Ground
100-13	Engine Oil Pressure Calibration Required	Engine Oil Pressure Calibration Required
110-04	Engine Coolant Temperature Short To Ground	Engine Coolant Temperature Short To Ground
168-00	System Voltage High	System Voltage High
168-01	System Voltage Low	System Voltage Low
168-02	System Voltage Intermittent	System Voltage Intermittent
172-03	Intake Manifold Air Temp Open/Short To +Batt	Intake Manifold Air Temp Open/Short To +Batt
172-04	Intake Manifold Air Temp Short To Ground	Intake Manifold Air Temp Short To Ground
174-03	Fuel Temperature Open/Short To +Batt	Fuel Temperature Open/Short To +Batt
174-04	Fuel Temperature Short To Ground	Fuel Temperature Short To Ground
175-03	Engine Oil Temperature Open/Short To +Batt	Engine Oil Temperature Open/Short To +Batt
175-04	Engine Oil Temperature Short To Ground	Engine Oil Temperature Short To Ground
190-08	Engine Speed Signal Abnormal (Top Speed Timing Sensor)	Engine Speed Signal Abnormal (Top Speed Timing Sensor)
248-09	CAT Data Link Communications	CAT Data Link Communications
253-02	Personality Module Mismatch	Personality Module Mismatch
254-12	Electronic Control Module Error	Electronic Control Module Error
261-13	Engine Timing Calibration Required	Engine Timing Calibration Required
262-03	5 Volt Sensor Supply Short To +Batt	5 Volt Sensor Supply Short To +Batt
262-04	5 Volt Sensor Supply Short To Ground	5 Volt Sensor Supply Short To Ground
263-03	Digital Sensor Supply Short To +Batt	Digital Sensor Supply Short To +Batt
263-04	Digital Sensor Supply Short To Ground	Digital Sensor Supply Short To Ground
268-02	Check Programmable Parameters	Check Programmable Parameters
273-00	Turbo Outlet Pressure Above Normal	Turbo Outlet Pressure Above Normal
273-03	Turbo Outlet Pressure Open/Short To +Batt	Turbo Outlet Pressure Open/Short To +Batt
273-04	Turbo Outlet Pressure Short To Ground	Turbo Outlet Pressure Short To Ground
273-13	Turbo Outlet Pressure Calibration Required	Turbo Outlet Pressure Calibration Required
274-03	Atmospheric Pressure Open/Short To +Batt	Atmospheric Pressure Open/Short To +Batt
274-04	Atmospheric Pressure Short To Ground	Atmospheric Pressure Short To Ground
274-13	Atmospheric Pressure Calibration Required	Atmospheric Pressure Calibration Required
336-02	Incorrect ECS Switch Inputs	Incorrect ECS Switch Inputs
337-02	Incorrect Remote E-Stop Switch Inputs	Incorrect Remote E-Stop Switch Inputs
342-02	Loss Of Secondary Engine Speed Signal (Bottom Speed/Timing Sensor)	Loss Of Secondary Engine Speed Signal (Bottom Speed/Timing Sensor)
342-08	Secondary Engine Speed Signal Abnormal (Bottom Speed/Timing Sensor)	Secondary Engine Speed Signal Abnormal (Bottom Speed/Timing Sensor)
444-05	Start Relay Open Circuit	Start Relay Open Circuit
444-06	Start Relay Short To Ground	Start Relay Short To Ground
446-05	Air Shut-off Relay Open	Air Shut-off Relay Open
446-06	Air Shut-off Relay Short	Air Shut-off Relay Short
460-03	Filtered Fuel Pressure Open/Short To +Batt	Filtered Fuel Pressure Open/Short To +Batt
460-04	Filtered Fuel Pressure Short To Ground	Filtered Fuel Pressure Short To Ground
460-13	Filtered Fuel Pressure Calibration Required	Filtered Fuel Pressure Calibration Required
535-08	Exhaust Temperature Sensor Noisy Signal	Exhaust Temperature Sensor Noisy Signal
545-05	Ether Start Relay Open/Short To +Batt	Ether Start Relay Open/Short To +Batt
545-06	Ether Start Relay Short To Ground	Ether Start Relay Short To Ground
1490-02	Loss Of Engine Speed Signal (Top Speed Timing Sensor)	Loss Of Engine Speed Signal (Top Speed Timing Sensor)