192
SJ63 AJ+, SJ63 AJ229043AAA
Section 4 – Troubleshooting Information Hydraulic System - CE & AS
4.6-21 Differential Lock will not Engage
1. Stuck or defective shuttle valve SV3. Clean valve. Check O-rings on valve. Check
operation of valve. Repair or replace valve as
required.
2. Defective or misadjusted pressure reducing valve
PR1.
Set valve to specifications. Check O-rings and
clean valve. Repair or replace valve as required.
3. Stuck or defective differential lock valve 3H-165. Clean valve. Check O-rings on valve. Check
operation of valve. Repair or replace valve as
required.
4. Bypassing or defective differential lock cylinder
C13.
Check seals on cylinder. Replace as necessary.
Replace cylinder if defective
4.6-22 No Drive Forward or Reverse
1. Brake not releasing. See “brake will not release” in this section.
2. Defective or misadjusted charge pump relief
valve RV10.
Set valve to specifications. Check O-rings and
clean valve. Repair or replace valve as required.
3. Worn charge pump P1A. Check pump. Replace if defective.
4. Defective pump displacement control 4H-15 and
4H-16.
Check control. Replace if defective.
5. Open bypass valve V4. Close bypass valve.
6. Drive servo stuck in neutral position. Check valve. Replace if defective.
7. Worn drive pump P1. Check pump. Replace if defective.
8. Worn or defective drive motor M1. Check motor. Replace if defective.
4.6-23 No Forward Drive
1. Defective pump displacement control 4H-16. Check control. Replace if defective.
2. Defective or misadjusted drive relief valve RV9. See section 5 for drive pump set up procedures.
3. Drive servo stuck in neutral position. Check valve. Replace if defective.
4.6-24 No Reverse Drive
1. Defective pump displacement control 4H-15. Check control. Replace if defective.
2. Defective or misadjusted drive relief valve RV8. See section 5 for drive pump set up procedures.
3. Drive servo stuck in neutral position. Check valve. Replace if defective.
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