No Riser Up Or Down - Skyjack SJ85 AJ Service Manual

Section 4 – Troubleshooting Information

4.3-6 No Riser Up or Down

No Riser Up:
1. Stuck or defective differential sensing valve
DSV4.
2. Stuck or defective riser up valve 4H-31.
3. Stuck or defective, or misadjusted releif valve
RV4 (stuck open, or leak to tank port).
4. Stuck or defective check valve CV12.
5. Stuck or defective counterbalance valve CB15
and/or CB16.
6. Shuttle valve SV3 stuck or defective.
7. Defective riser cylinder(s) C11 and/or C12.
No Riser Down:
1. Stuck or defective differential sensing valve
DSV4.
2. Stuck or defective riser down valve 4H-30.
3. Stuck or defective, or misadjusted releif valve
RV4 (stuck open, or leak to tank port).
4. Stuck or defective check valve CV12.
5. Stuck or defective counterbalance valve CB15
and/or CB16.
6. Shuttle valve SV3 stuck or defective.
7. Defective riser cylinder(s) C11 and/or C12.
229044ADA
132
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.
Adjust valve. 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.
Clean valve. Check operation of 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 operation of valve. Repair or
replace valve as required.
Adjust valve. 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.
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
SJ85 AJ