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