125
SJ30AJE, SJ30ARJE 196274AF
Hydraulic System Section 4 – Troubleshooting Information
4.3-16 Platform will not Level Down Manually
1. Plugged or defective orifice OR1. Check orifice. Replace if plugged or defective.
2. Stuck or defective platform level down valve 4H-
40.
Clean valve. Check operation of valve. Repair or
replace valve as required.
3. Stuck or defective dual pilot operated check
valve DPOCV1.
Clean valve. Check O-rings on valve. Check
operation of valve. Repair or replace valve as
required.
4. Stuck or defective check valve CV2. Clean valve. Check O-rings on valve. Check
operation of valve. Repair or replace valve as
required.
5. Stuck or defective relief valve RV2. Set valve to specifications. Check O-rings and
clean valve. Repair or replace valve as required.
6. Stuck or defective counterbalance valve CB5 or
CB6.
Clean valve. Check O-rings on valve. Repair or
replace valve as required.
7. Defective leveling cylinder C7 or slave cylinder
C6.
Check seals on cylinder. Replace as necessary.
Replace cylinder if defective.
4.3-17 Platform will not Level Up Manually
1. Plugged or defective orifice OR1. Check orifice. Replace if plugged or defective.
2. Stuck or defective platform level up valve 4H-41. Clean valve. Check operation of valve. Repair or
replace valve as required.
3. Stuck or defective dual pilot operated check
valve DPOCV1.
Clean valve. Check O-rings on valve. Check
operation of valve. Repair or replace valve as
required.
4. Stuck or defective check valve CV3. Clean valve. Check O-rings on valve. Check
operation of valve. Repair or replace valve as
required.
5. Stuck or defective relief valve RV2. Set valve to specifications. Check O-rings and
clean valve. Repair or replace valve as required.
6. Stuck or defective counterbalance valve CB5 or
CB6.
Clean valve. Check O-rings on valve. Repair or
replace valve as required.
7. Defective leveling cylinder C7 or slave cylinder
C6.
Check seals on cylinder. Replace as necessary.
Replace cylinder if defective.
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