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Section 4 – Troubleshooting Information
4. Stuck or defective check valve CV4.
5. Stuck or defective relief valve RV2.
6. Stuck or defective shuttle valve SV7.
7. Stuck or defective counterbalance valve CB1.
8. Turret rotate brake BR1 not releasing.
9. Worn or defective swing drive motor M2.
4.3-6 No Boom Extend
1. Stuck or defective differential sensing valve
DSV3.
2. Stuck or defective boom extend valve 3H-39.
3. Stuck or defective check valve CV11.
4. Stuck or defective check valve CV6.
5. Stuck or defective relief valve RV4.
6. Return valve V5 stuck in the open position.
7. Stuck or defective counterbalance valve CB4.
8. Return valve V4 stuck in the closed position or is
defective.
9. Defective extension cylinder C2.
4.3-7 No Boom Retract
229040ABA
150
Clean valve. Check O-rings on valve. Check opera-
tion of valve. Repair or replace valve as required.
Set valve to specifications. Check O-rings and
clean valve. Repair or replace valve as required.
Clean valve. Check O-rings on valve. Check opera-
tion of valve. Repair or replace valve as required.
Clean valve. Check O-rings on valve. Repair or
replace valve as required.
Inspect brake for worn seals or broken compo-
nents. Repair and replace as necessary.
Check motor. Repair or replace if defective.
Clean valve. Check O-rings on valve. Check opera-
tion 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 opera-
tion of valve. Repair or replace valve as required.
Clean valve. Check O-rings on valve. Check opera-
tion of valve. Repair or replace valve as required.
Set valve to specifications. Check O-rings and
clean 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.
Clean valve. Check operation of valve. Repair or
replace valve as required.
Check seals on cylinder. Replace as necessary.
Replace cylinder if defective.
Hydraulic System
SJ82 T, SJ86 T
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