Skyjack SJ63 AJ+ Service Manual

188
SJ63 AJ+, SJ63 AJ229043AAA
Section 4 – Troubleshooting Information Hydraulic System - CE & AS
4.6-9 No Boom Extend
1. Stuck or defective extend valve 5H-39. Clean valve. Check operation of valve. Repair or
replace valve as required.
2. Stuck or defective check valve CV6. Clean valve. Check operation of valve. Repair or
replace valve as required.
3. Stuck or defective differential pressure sensing
valve DSV4.
Clean valve. Check O-rings on valve. Check
operation of valve. Repair or replace valve as
required.
4. Stuck or defective relief valve RV6. Set valve to specifications. Check O-rings and
clean valve. Repair or replace valve as required.
5. Stuck or defective counterbalance valve CB7. Clean valve. Check O-rings on valve. Repair or
replace valve as required.
6. Defective extension cylinder C2. Check seals on cylinder. Replace as necessary.
Replace cylinder if defective.
4.6-10 No Boom Retract
1. Stuck or defective retract valve 5H-38. Clean valve. Check operation of valve. Repair or
replace valve as required.
2. Stuck or defective check valve CV6. Clean valve. Check operation of valve. Repair or
replace valve as required.
3. Stuck or defective differential pressure sensing
valve DSV4.
Clean valve. Check O-rings on valve. Check
operation of valve. Repair or replace valve as
required.
4. Stuck or defective relief valve RV6. Set valve to specifications. Check O-rings and
clean valve. Repair or replace valve as required.
5. Stuck or defective counterbalance valve CB8. Clean valve. Check O-rings on valve. Repair or
replace valve as required.
6. Defective extension cylinder C2. Check seals on cylinder. Replace as necessary.
Replace cylinder if defective.
4.6-11 No Jib Up
1. Stuck or defective jib up/ platform rotate left valve
5H-35.
Clean valve. Check operation of valve. Repair or
replace valve as required.
2. Plugged or defective orifice OR4. Check orifice. Replace if plugged or defective.
3. Stuck or defective check valve CV8. Clean valve. Check operation of valve. Repair or
replace valve as required.
4. Stuck or defective counterbalance valve CB1. Clean valve. Check O-rings on valve. Repair or
replace valve as required.
5. Defective jib cylinder C1. Check seals on cylinder. Replace as necessary.
Replace cylinder if defective.
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Skyjack SJ63 AJ+ Specifications

General

Brand	Skyjack
Model	SJ63 AJ+
Category	Boom Lifts
Language	English