Skyjack SJ82 T Service Manual

155
SJ82 T, SJ86 T
229040ABA
Hydraulic System Section 4 – Troubleshooting Information
4.3-14 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 RV8.
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 V6. Close bypass valve.
6. Worn or defective drive pump P1. Check pump. Replace if defective.
7. Worn or defective drive motor M1. Check motor. Replace if defective.
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.
Reverse Drive
1. Defective pump displacement control 4H-15. Check control. Replace if defective.
2. Defective or misadjusted drive relief valve RV7. See section 5 for drive pump set up procedures.
4.3-15 Differential Lock will not Engage
1. Stuck or defective differential lock valve 3H-165. Clean valve. Check O-rings on valve. Check opera-
tion of valve. Repair or replace valve as required.
2. Bypassing or defective differential lock cylinder
C10.
Check seals on cylinder. Replace as necessary.
Replace cylinder if defective
4.3-16 No High Speed Drive
1. Stuck or defective 2 speed valve 3H-45. Clean valve. Check O-rings on valve. Check opera-
tion of valve. Repair or replace valve as required.
2. Defective shift spool in drive motor M1. Check motor. Repair or replace if necessary.
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Skyjack SJ82 T Specifications

General

Brand	Skyjack
Model	SJ82 T
Category	Boom Lifts
Language	English