DISTRIBUTION AR 3858521 - Caterpillar

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LOCATION OF THE HOIST CONTROL VALVE - D400E II
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the machine. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to Special Publication NENG2500, "Caterpillar Tools and Shop Products Guide" for tools and supplies suitable to collect and contain fluids in Caterpillar machines.Dispose of all fluids according to local regulations and mandates.
Test Step 1.
Start the engine.
Place the hoist control lever in the raise position until the dump body moves.
Check the components of the hoist system for damage or leaks. Repair the components if it is necessary.
Check for drift of the hoist cylinders. Check for leakage from the hoist control valve to the tank or to the atmosphere.Expected Result:There is no drift of the hoist cylinders and there is no leakage from the hoist control valve to the tank or to the atmosphere.Results:
No Leak... - Stop.
Leak... - Proceed to test step 2.Test Step 2.
Loosen jam nut (2) of bleeder valve (1) .
Make sure that adjustment screw (1) is tight.
Tighten jam nut (2) .Photo...
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HOIST CONTROL VALVE RELIEF VALVES - D400E IILocation...
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LOCATION OF THE HOIST CONTROL VALVE - D400E IIExpected Result:The bleeder valve is closed. There is no drift of the hoist cylinders. There is no leakage from the hoist control valve.Results:
No Leak... - Stop.
Leak... - Proceed to test step 3.Test Step 3.
Make sure that the engine is stopped. Make sure that the dump body is fully lowered. Make sure that the hydraulic pressure is zero. Be cautious of hot hydraulic fluid.
Remove bleeder valve (2) by unscrewing the valve cartridge in the counterclockwise direction.
Install a new bleeder valve.Photo...
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HOIST CONTROL VALVE RELIEF VALVES - D400E IILocation...
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LOCATION OF THE HOIST CONTROL VALVE - D400E IIExpected Result:The bleeder valve has been replaced. There is no drift of the hoist cylinders. There is no leakage from the hoist control valve to the tank or to the atmosphere.Results:
No Leak... - Stop.
Leak... - Proceed to test step 5.Test Step 4. Remove the hoist control valve and replace the hoist control valve.Remove...Reference: Refer toTroubleshooting, "Hoist Control Valve - Remove".Install...Reference: Refer toTroubleshooting, "Hoist Control Valve - Install".Parts...Reference: Refer toTroubleshooting, sebp2784, "139-5823 VALVE GP-CONTROL PIN 8PS1-UP. PART OF 139-0996 VALVE & MTG GP-HOIST CONTROL".Expected Result:The new hoist control valve is installed.Results:
Repair Complete - Stop.Test Step 5. Perform the following test: Spool Centering for Hoist Control Valve - TestResults:
OK - Proceed to test step 4.
REPAIRED, OK - Proceed to test step 6.Test Step 6. Expected Result:The leaking problem has been resolved.Results:
Yes - Stop.
No - Proceed to test step 4.