Skyjack SJ82 T Service Manual

149
SJ82 T, SJ86 T
229040ABA
Hydraulic System Section 4 – Troubleshooting Information
1. Stuck or defective differential sensing valve
DSV2.
Clean valve. Check O-rings on valve. Check opera-
tion of valve. Repair or replace valve as required.
2. Stuck or defective lift up valve 4H-13. Clean valve. Check operation of valve. Repair or
replace valve as required.
3. Stuck or defective shuttle valve SV2. Clean valve. Check O-rings on valve. Check opera-
tion of valve. Repair or replace valve as required.
4. Stuck or defective check valve CV5. Clean valve. Check O-rings on valve. Check opera-
tion of valve. Repair or replace valve as required.
5. Stuck or defective counterbalance valve CB3. Clean valve. Check O-rings on valve. Repair or
replace valve as required.
6. Defective lift cylinder C1. Check seals on cylinder. Replace as necessary.
Replace cylinder if defective.
4.3-5 No Turret Rotate
Left Rotate
1. Stuck or defective differential sensing valve
DSV1.
Clean valve. Check O-rings on valve. Check opera-
tion of valve. Repair or replace valve as required.
2. Stuck or defective rotate left valve 4H-32. Clean valve. Check operation of valve. Repair or
replace valve as required.
3. Stuck or defective shuttle valve SV1. Clean valve. Check O-rings on valve. Check opera-
tion of valve. Repair or replace valve as required.
4. Stuck or defective check valve CV4. Clean valve. Check O-rings on valve. Check opera-
tion 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 shuttle valve SV7. Clean valve. Check O-rings on valve. Check opera-
tion of valve. Repair or replace valve as required.
7. Stuck or defective counterbalance valve CB2. Clean valve. Check O-rings on valve. Repair or
replace valve as required.
8. Turret rotate brake BR1 not releasing. Inspect brake for worn seals or broken compo-
nents. Repair and replace as necessary.
9. Worn or defective swing drive motor M2. Check motor. Repair or replace if defective.
Right Rotate
1. Stuck or defective differential sensing valve
DSV1.
Clean valve. Check O-rings on valve. Check opera-
tion of valve. Repair or replace valve as required.
2. Stuck or defective rotate left valve 4H-33. Clean valve. Check operation of valve. Repair or
replace valve as required.
3. Stuck or defective shuttle valve SV1. Clean valve. Check O-rings on valve. Check opera-
tion of valve. Repair or replace valve as required.
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Skyjack SJ82 T Specifications

General

Brand	Skyjack
Model	SJ82 T
Category	Boom Lifts
Language	English