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Hydraulic System
4.3-11 No Drive
No Drive Forward or Reverse:
1. Defective or misadjusted charge pump relief
valve RV7.
2. Worn charge pump P1A.
3. Defective pump displacement control 4H-15 and
4H-16.
4. Open bypass valve V6.
5. Worn or defective drive pump P1.
6. Worn or defective drive motorS M1A and/or M1B. Check motors. Replace if defective.
7. Brake not releasing.
No Forward Drive:
1. Defective pump displacement control 4H-16.
2. Defective or misadjusted drive relief valve RV6.
No Drive Reverse Drive:
1. Defective pump displacement control 4H-15.
2. Defective or misadjusted drive relief valve RV5.
No High Speed Drive:
1. Stuck or defective 2 speed valve 3H-45.
2. Defective shift spool in drive motor M1.
SJ85 AJ
Section 4 – Troubleshooting Information
Set valve to specifications. Check O-rings and
clean valve. Repair or replace valve as required.
Check pump. Replace if defective.
Check control. Replace if defective.
Close bypass valve.
Check pump. Replace if defective.
See "brake will not release" in this section.
Check control. Replace if defective.
See section 5 for drive pump set up procedures.
Check control. Replace if defective.
See section 5 for drive pump set up procedures.
Clean valve. Check O-rings on valve. Check
operation of valve. Repair or replace valve as
required.
Check motor. Repair or replace if necessary.
229044ADA
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