Skyjack SJ85 AJ Service Manual

132
SJ85 AJ229044ADA
Section 4 – Troubleshooting Information Hydraulic System
4.3-6 No Riser Up or Down
No Riser Up:
1. Stuck or defective differential sensing valve
DSV4.
Clean valve. Check O-rings on valve. Check
operation of valve. Repair or replace valve as
required.
2. Stuck or defective riser up valve 4H-31. Clean valve. Check operation of valve. Repair or
replace valve as required.
3. Stuck or defective, or misadjusted releif valve
RV4 (stuck open, or leak to tank port).
Adjust valve. Clean valve. Check O-rings on valve.
Check operation of valve. Repair or replace valve
as required.
4. Stuck or defective check valve CV12. Clean valve. Check O-rings on valve. Check
operation of valve. Repair or replace valve as
required.
5. Stuck or defective counterbalance valve CB15
and/or CB16.
Clean valve. Check O-rings on valve. Repair or
replace valve as required.
6. Shuttle valve SV3 stuck or defective. Clean valve. Check operation of valve. Repair or
replace valve as required.
7. Defective riser cylinder(s) C11 and/or C12. Check seals on cylinder. Replace as necessary.
Replace cylinder if defective.
No Riser Down:
1. Stuck or defective differential sensing valve
DSV4.
Clean valve. Check O-rings on valve. Check
operation of valve. Repair or replace valve as
required.
2. Stuck or defective riser down valve 4H-30. Clean valve. Check operation of valve. Repair or
replace valve as required.
3. Stuck or defective, or misadjusted releif valve
RV4 (stuck open, or leak to tank port).
Adjust valve. Clean valve. Check O-rings on valve.
Check operation of valve. Repair or replace valve
as required.
4. Stuck or defective check valve CV12. Clean valve. Check O-rings on valve. Check
operation of valve. Repair or replace valve as
required.
5. Stuck or defective counterbalance valve CB15
and/or CB16.
Clean valve. Check O-rings on valve. Repair or
replace valve as required.
6. Shuttle valve SV3 stuck or defective. Clean valve. Check operation of valve. Repair or
replace valve as required.
7. Defective riser cylinder(s) C11 and/or C12. 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