No Jib Up Or Down - Skyjack SJ85 AJ Service Manual

Section 4 – Troubleshooting Information

4.3-8 No Jib Up or Down

No Jib Up:
1. Stuck or defective proportional flow enable valve
2H-42.
2. Stuck or defective check valve CV18.
3. Stuck or defective jib up valve 4H-35.
4. Flow Regulator FR2 stuck or defective.
5. Return check valve CV7 suck or defective.
6. Stuck or defective counterbalance valves CB8
and/or CB9.
7. Defective jib cylinder C5.
No Jib Down:
1. Stuck or defective proportional flow enable valve
2H-42.
2. Stuck or defective check valve CV18.
3. Stuck or defective jib up valve 4H-34.
4. Flow Regulator FR2 stuck or defective.
5. Return check valve CV7 suck or defective.
6. Stuck or defective counterbalance valves CB8
and/or CB9.
7. Defective jib cylinder C5.
229044ADA
134
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.
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.
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 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. Repair or
replace valve as required.
Check seals on cylinder. Replace as necessary.
Replace cylinder if defective.
Hydraulic System
SJ85 AJ