Skyjack SJ85 AJ Service Manual

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SJ85 AJ229044ADA
Section 4 – Troubleshooting Information Hydraulic System
4.3-8 No Jib Up or Down
No Jib Up:
1. Stuck or defective proportional flow enable valve
2H-42.
Clean valve. Check O-rings on valve. Check
operation of valve. Repair or replace valve as
required.
2. Stuck or defective check valve CV18. Clean valve. Check O-rings on valve. Check
operation of valve. Repair or replace valve as
required.
3. Stuck or defective jib up valve 4H-35. Clean valve. Check operation of valve. Repair or
replace valve as required.
4. Flow Regulator FR2 stuck or defective. Clean valve. Check O-rings on valve. Check
operation of valve. Repair or replace valve as
required.
5. Return check valve CV7 suck or defective. Clean valve. Check O-rings on valve. Check
operation of valve. Repair or replace valve as
required.
6. Stuck or defective counterbalance valves CB8
and/or CB9.
Clean valve. Check O-rings on valve. Repair or
replace valve as required.
7. Defective jib cylinder C5. Check seals on cylinder. Replace as necessary.
Replace cylinder if defective.
No Jib Down:
1. Stuck or defective proportional flow enable valve
2H-42.
Clean valve. Check O-rings on valve. Check
operation of valve. Repair or replace valve as
required.
2. Stuck or defective check valve CV18. Clean valve. Check O-rings on valve. Check
operation of valve. Repair or replace valve as
required.
3. Stuck or defective jib up valve 4H-34. Clean valve. Check operation of valve. Repair or
replace valve as required.
4. Flow Regulator FR2 stuck or defective. Clean valve. Check O-rings on valve. Check
operation of valve. Repair or replace valve as
required.
5. Return check valve CV7 suck or defective. Clean valve. Check O-rings on valve. Check
operation of valve. Repair or replace valve as
required.
6. Stuck or defective counterbalance valves CB8
and/or CB9.
Clean valve. Check O-rings on valve. Repair or
replace valve as required.
7. Defective jib cylinder C5. 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