Skyjack SJ46 AJ+ Service Manual

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229042ABASJ46 AJ+, SJ46 AJ, SJ51 AJ
Hydraulic System Section 4 – Troubleshooting Information
4.5-4 No Main Boom Down
1. Stuck or defective lift down valve 4H-13. Clean valve. Check operation of valve. Repair or
replace valve as required.
2. Stuck or defective shuttle valve SV6. Clean valve. Check O-rings on valve. Check
operation of valve. Repair or replace valve as
required.
3. Stuck or defective check valve CV10. Clean valve. Check operation of valve. Repair or
replace valve as required.
4. Stuck or defective differential sensing valve
DSV4.
Clean valve. Check O-rings on valve. Check
operation of valve. Repair or replace valve as
required.
5. Stuck or defective counterbalance valve CB9. Clean valve. Check O-rings on valve. Repair or
replace valve as required.
6. Defective lift cylinder C3. Check seals on cylinder. Replace as necessary.
Replace cylinder if defective.
4.5-5 No Riser Boom Up
1. Stuck or defective riser up valve 4H-31. Clean valve. Check operation of valve. Repair or
replace valve as required.
2. Stuck or defective shuttle valve SV5. Clean valve. Check O-rings on valve. Check
operation of valve. Repair or replace valve as
required.
3. Stuck or defective check valve CV5. Clean valve. Check O-rings on valve. Check
operation of valve. Repair or replace valve as
required.
4. Stuck or defective check valve CV8. Clean valve. Check operation of valve. Repair or
replace valve as required.
5. Stuck or defective differential pressure sensing
valve DSV3.
Clean valve. Check O-rings on valve. Check
operation of valve. Repair or replace valve as
required.
6. Stuck or defective counterbalance valve CB5 or
CB6.
Clean valve. Check O-rings on valve. Repair or
replace valve as required.
7. Defective riser cylinder C6 or C7. Check seals on cylinder. Replace as necessary.
Replace cylinder if defective.
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Skyjack SJ46 AJ+ Specifications

General

Brand	Skyjack
Model	SJ46 AJ+
Category	Boom Lifts
Language	English