Skyjack SJ63 AJ+ Service Manual

186
SJ63 AJ+, SJ63 AJ229043AAA
Section 4 – Troubleshooting Information Hydraulic System - CE & AS
4. Stuck or defective check valve CV5. Clean valve. Check operation of valve. Repair or
replace valve as required.
5. Stuck or defective relief valve RV5. Set valve to specifications. Check o-rings and clean
valve. Repair or replace valve as required.
6. Stuck or defective counterbalance valve CB9. Clean valve. Check O-rings on valve. Repair or
replace valve as required.
7. Defective lift cylinder C3. Check seals on cylinder. Replace as necessary.
Replace cylinder if defective.
4.6-5 No Riser Boom Up
1. Stuck or defective riser up valve 5H-31. Clean valve. Check operation of valve. Repair or
replace valve as required.
2. Stuck or defective check valve CV9. Clean valve. Check operation of valve. Repair or
replace valve as required.
3. Stuck or defective differential pressure sensing
valve DSV2.
Clean valve. Check O-rings on valve. Check
operation of valve. Repair or replace valve as
required.
4. Stuck or defective counterbalance valve CB5 or
CB6.
Clean valve. Check O-rings on valve. Repair or
replace valve as required.
5. Defective riser cylinder C6 or C7. Check seals on cylinder. Replace as necessary.
Replace cylinder if defective.
4.6-6 No Riser Boom Down
1. Stuck or defective riser down valve 5H-30. Clean valve. Check operation of valve. Repair or
replace valve as required.
2. Stuck or defective relief valve RV4. Set valve to specifications. Check o-rings and clean
valve. Repair or replace valve as required.
3. Stuck or defective check valve CV9. Clean valve. Check O-rings on valve. Check
operation of valve. Repair or replace valve as
required.
4. Stuck or defective differential pressure sensing
valve DSV2.
Clean valve. Check O-rings on valve. Check
operation of valve. Repair or replace valve as
required.
5. Stuck or defective counterbalance valve CB5 or
CB6.
Clean valve. Check O-rings on valve. Repair or
replace valve as required.
6. Defective riser cylinder C6 or C7. 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