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Hydraulic System
6. Stuck or defective counterbalance valve CB14.
7. Stuck or defective check valve CV17.
8. Stuck or defective shuttle valve SV4.
9. Return valve V4 stuck in the closed position or is
defective.
10. Defective lift cylinder C1.
No Main Boom Up:
1. Stuck or defective differential sensing valve
DSV3.
2. Stuck or defective boom down valve 4H-13.
3. Stuck or defective valve V4 (stuck open, or leak
to tank port).
4. Stuck or defective releif valve RV5 (stuck open, or
leak to tank port).
5. Stuck or defective check valve CV13.
6. Stuck or defective counterbalance valve CB3.
7. Return valve V6 stuck in the closed position or is
defective.
8. Defective lift cylinder C1.
SJ85 AJ
Section 4 – Troubleshooting Information
Clean valve. Check O-rings on 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. Check
operation of valve. Repair or replace valve as
required.
Clean valve. Check operation of valve. Repair or
replace valve as required.
Check seals on cylinder. Replace as necessary.
Replace cylinder if defective.
Clean valve. Check O-rings on valve. Check
operation of 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. 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. 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.
Check seals on cylinder. Replace as necessary.
Replace cylinder if defective.
229044ADA
129
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