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