ROTATING GP-PUMP 6E4356 - Caterpillar

The Engine Crankshaft Turns Too Slowly
Probable Causes
Low battery voltage
Faulty cable or connection (battery to starting motor)
Incorrect lubrication oil
Faulty starting motor
Extra load
Internal mechanical problemRecommended Repairs
Low Battery Voltage
Check battery voltage. If the battery voltage is less than 12 volts for a 12 volt system, or 24 volts for a 24 volt system, put a charge on the battery. If the battery will not keep a charge, load test the battery. Refer to Systems Operation, Testing And Adjusting, "Electrical System" and Special Instruction, SEHS7633, "Battery Test Procedure".Faulty Cable or Connection
With the ignition switch in the "START" position, check the voltage at the connection of the battery cable to the starting motor. If there is no voltage, or if the voltage is low at this connection and there is good voltage at the battery, check for a faulty battery cable. Also check all connections between the battery and the starting motor.Incorrect Lubrication Oil
Ensure that the proper lubrication oil is installed. Use the recommended lubrication viscosities that are listed in the Operation And Maintenance Manual.Faulty Starting Motor
Remove the starting motor and test the starting motor. Repair the starting motor or install a new starting motor.Extra Load
Check the driveline for free movement. Disconnect the PTO drives or remove the PTO drives. Remove engine accessories and inspect engine accessories that put an additional load on the engine. The following components should be inspected:
Air compressor
Power steering pump
Engine oil pump
Hydraulic oil pumpInternal Mechanical Problem
If the engine cranks too slowly and the driven equipment has been disconnected, the engine must be disassembled. After the engine is disassembled, inspect the engine for other internal problems. Possible internal problems include the following conditions:
Bearing seizure
Piston seizure
Valve and piston contactThe Engine Crankshaft Turns Freely
Note: Use the following information as a guide to help solve a hard starting problem when the engine runs properly after starting.Probable Causes
Low fuel level
Improper starting procedure
Fuel shutoff solenoid
Fuel waxing
Worn unit injectors
Leaking fuel return passage check valve
Air in fuel or no fuel
Insufficient rack position during cranking
Incorrect fuel injection timing
Low cylinder compressionRecommended Repairs
Low Fuel Level
Visually check the fuel level. Do not rely on the fuel gauge. The lack of exhaust smoke or the lack of intermittent firing during cranking typically indicates insufficient fuel.Improper Starting Procedure
Refer to the Operation And Maintenance Manual for the correct starting procedure and cold weather recommendations.Fuel Shutoff Solenoid
The Fuel Shutoff Solenoid should produce a click as the keyswitch is first turned to the "ON" position. If the solenoid is not heard, check for battery voltage across the solenoid terminals while the keyswitch is "ON". If voltage is not present, troubleshoot the electrical system. If voltage is present, temporarily remove the solenoid. Verify that the solenoid plunger retracts when the keyswitch is turned to the "ON" position.Fuel Waxing
For cold outside temperatures, check for the presence of fuel waxing. Refer to Troubleshooting, "Fuel Quality" for details. Check for proper operation of ether starting system and/or air inlet heater (if equipped).Worn Unit Injectors
For starting difficulty, only when the engine is hot, refer to Troubleshooting, "Unit Injector Cranking