Skyjack SJ85 AJ Service Manual

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SJ85 AJ 229044ADA
Hydraulic System Section 4 – Troubleshooting Information
4.3-5 No Boom Extend or Retract
No Boom Extend:
1. Stuck or defective differential sensing valve
DSV2.
Clean valve. Check O-rings on valve. Check
operation of valve. Repair or replace valve as
required.
2. Stuck or defective boom extend valve 4H-39. Clean valve. Check operation of valve. Repair or
replace valve as required.
3. Stuck or defective valve V2 (stuck open, or leak
to tank port).
Clean valve. Check O-rings on valve. Check
operation of valve. Repair or replace valve as
required.
4. Stuck or defective releif valve RV6 (stuck open, or
leak to tank port).
Clean valve. Check O-rings on valve. Check
operation of valve. Repair or replace valve as
required.
5. Stuck or defective counterbalance valve CB5. Clean valve. Check O-rings on valve. Repair or
replace valve as required.
6. Return valve V5 stuck in the closed position or is
defective.
Clean valve. Check operation of valve. Repair or
replace valve as required.
7. Defective lift cylinder C2. Check seals on cylinder. Replace as necessary.
Replace cylinder if defective.
No Boom Retract:
1. Stuck or defective differential sensing valve
DSV2.
Clean valve. Check O-rings on valve. Check
operation of valve. Repair or replace valve as
required.
2. Stuck or defective boom retract valve 4H-38. Clean valve. Check operation of valve. Repair or
replace valve as required.
3. Stuck or defective valve V5 (stuck open, or leak
to tank port).
Clean valve. Check O-rings on valve. Check
operation of valve. Repair or replace valve as
required.
4. Stuck or defective counterbalance valve CB4. Clean valve. Check O-rings on valve. Repair or
replace valve as required.
5. Return valve V2 stuck in the closed position or is
defective.
Clean valve. Check operation of valve. Repair or
replace valve as required.
6. Defective lift cylinder C2. Check seals on cylinder. Replace as necessary.
Replace cylinder if defective.
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Skyjack SJ85 AJ Specifications

General

Brand	Skyjack
Model	SJ85 AJ
Category	Boom Lifts
Language	English