Hydraulic System Pressure Is Low
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953D, 963D and 973D Track-Type Loaders
[KENR6327]
953D, 963D and 973D Track-Type Loaders
Steering Does Not Function in One Direction
953D, 963D and 973D Track-Type Loaders
Hydraulic System Hesitates
HYDRAULIC SYSTEM
525D, 535D, 545D and 555D Wheel Skidders
Symptom Troubleshooting
953D, 963D and 973D Track-Type Loaders
Brake Does Not Release
953D, 963D and 973D Track-Type Loaders
Hydraulic System Has Unusual Noise
953D, 963D and 973D Track-Type Loaders
Hydraulic System Oil Contains Air
953D, 963D and 973D Track-Type Loaders
Hydraulic System Oil Temperature Is High
953D, 963D and 973D Track-Type Loaders
Implement Cycle Time Is Fast
953D, 963D and 973D Track-Type Loaders
Hydraulic System Pressure Is Low
1.1. Probable Causes
2.1. Recommended Actions
3.2. Problems With The Hydraulic Hoses or Hydraulic Lines
4.2. The Flow Compensator Spool Is Adjusted Incorrectly
5.2. The Pressure Compensator Spool Is Adjusted Incorrectly
6.2. The Load Sensing Signal Circuit May Be Leaking
7.2. The Spring For The Flow Compensator In The Pump Is Broken
8.2. The Pump Is Not Upstroking
- Problems with the hydraulic hoses or hydraulic lines
- The flow compensator spool is adjusted incorrectly.
- The pressure compensator spool is adjusted incorrectly.
- The load sensing signal circuit may be leaking.
- The spring for the flow compensator in the pump is broken.
- The pump is not upstroking.
Problems With The Hydraulic Hoses or Hydraulic Lines
Kinks or restrictions in hydraulic lines or hoses may act like an orifice that creates excessive noise and heat as the high pressure oil is forced through a passage that is smaller than the original opening.
Be sure to check for these conditions on all hydraulic oil hoses, lines, and tubes in the system or the circuit that are in question. Correct any problems that are found. Then retest the hydraulic system for any symptoms.
The Flow Compensator Spool Is Adjusted Incorrectly
- Determine if the flow compensator spool in the compensator valve is adjusted correctly.
- Perform the Margin Pressure Test on the hydraulic pump.
Reference: Refer to Testing and Adjusting, "Hydraulic Pump - Test and Adjust" for your machine.
- Perform the Margin Pressure Test on the hydraulic pump.
The Pressure Compensator Spool Is Adjusted Incorrectly
- Make sure that the pressure compensator spool is adjusted correctly.
- Perform the High Pressure Stall Test on the hydraulic pump.
Reference: Refer to Testing and Adjusting, "Hydraulic Pump - Test and Adjust" for your machine.
- Perform the High Pressure Stall Test on the hydraulic pump.
The Load Sensing Signal Circuit May Be Leaking
- Inspect the load sensing signal circuit for leaks.
- If necessary, repair any leaks.
The Spring For The Flow Compensator In The Pump Is Broken
- Inspect flow spool spring (5) and verify that the spring is not broken.
Show/hide table
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| Illustration 1 | g00851050 |
| (5) Flow spool spring | |
- Check for pump wear.
- Perform the Pump Efficiency Check.
- Ensure that the swashplate is not blocked and ensure that the actuator spring is not broken.
- Repair the pump, if necessary.
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