Skyjack SJ85 AJ Service Manual

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SJ85 AJ 229044ADA
Hydraulic System Section 4 – Troubleshooting Information
4.3-7 No Platform Level
No Platform Level Up:
1. Orifice OR2 plugged. Clean or replace orifice as required.
2. Stuck or defective platform level up valve 5H-41. Clean valve. Check operation of valve. Repair or
replace valve as required.
3. Stuck or defective, or misadjusted releif valve
RV3 (stuck open, or leak to tank port).
Adjust valve. Clean valve. Check O-rings on valve.
Check operation of valve. Repair or replace valve
as required.
4. Stuck or defective check valve CV15. Clean valve. Check O-rings on valve. Check
operation of valve. Repair or replace valve as
required.
5. Stuck or defective pilot check valve CV5 and/or
CV6.
Clean valve. Check O-rings on valve. Repair or
replace valve as required.
6. Check valve CV9 stuck or defective. Clean valve. Check operation of valve. Repair or
replace valve as required.
7. Stuck or defective counterbalance valve CB6
and/or CB7.
Clean valve. Check O-rings on valve. Repair or
replace valve as required.
8. Defective master cylinder C3. Check seals on cylinder. Replace as necessary.
Replace cylinder if defective.
9. Defective slave cylinder C4. Check seals on cylinder. Replace as necessary.
Replace cylinder if defective.
No Platform Level Down:
1. Orifice OR2 plugged. Clean or replace orifice as required.
2. Stuck or defective platform level down valve 5H-
40.
Clean valve. Check operation of valve. Repair or
replace valve as required.
3. Stuck or defective, or misadjusted releif valve
RV3 (stuck open, or leak to tank port).
Adjust valve. Clean valve. Check O-rings on valve.
Check operation of valve. Repair or replace valve
as required.
4. Stuck or defective check valve CV15. Clean valve. Check O-rings on valve. Check
operation of valve. Repair or replace valve as
required.
5. Stuck or defective pilot check valve CV5 and/or
CV6.
Clean valve. Check O-rings on valve. Repair or
replace valve as required.
6. Check valve CV8 stuck or defective. Clean valve. Check operation of valve. Repair or
replace valve as required.
7. Stuck or defective counterbalance valve CB6
and/or CB7.
Clean valve. Check O-rings on valve. Repair or
replace valve as required.
8. Defective master cylinder C3. Check seals on cylinder. Replace as necessary.
Replace cylinder if defective.
9. Defective slave cylinder C4. Check seals on cylinder. Replace as necessary.
Replace cylinder if defective.
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Skyjack SJ85 AJ Specifications

General

Brand	Skyjack
Model	SJ85 AJ
Category	Boom Lifts
Language	English