Skyjack SJ46 AJ+ - 10 No Boom Extend; 11 No Boom Retract; 12 No Jib up - ANSI;CSA

184
229042ABA SJ46 AJ+, SJ46 AJ, SJ51 AJ
Section 4 – Troubleshooting Information Hydraulic System
4.5-10 No Boom Extend
1. Stuck or defective boom extend valve 3H-39. Clean valve. Check operation of valve. Repair or
replace valve as required.
2. Plugged, incorrectly adjusted or defective orifice
OR3.
Check orifice. Replace if plugged or defective.
3. Stuck in the shifted position or defective boom
retract valve 3H-38.
Clean valve. Check operation of valve. Repair or
replace valve as required.
4. Stuck or defective check valve CV11. Clean valve. Check operation of valve. Repair or
replace valve as required.
5. Stuck or defective counterbalance valve CB10. 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.
4.5-11 No Boom Retract
1. Stuck or defective boom retract valve 3H-38. Clean valve. Check operation of valve. Repair or
replace valve as required.
2. Plugged, incorrectly adjusted or defective orifice
OR3.
Check orifice. Replace if plugged or defective.
3. Stuck or defective check valve CV11. Clean valve. Check operation of valve. Repair or
replace valve as required.
4. Stuck or defective counterbalance valve CB11. Clean valve. Check O-rings on valve. Repair or
replace valve as required.
5. Defective extension cylinder C2. Check seals on cylinder. Replace as necessary.
Replace cylinder if defective
4.5-12 No Jib Up - ANSI/CSA
1. Stuck or defective jib enable valve 2H-42. Clean valve. Check O-rings on valve. Check
operation of valve. Repair or replace valve as
required.
2. Stuck or defective differential pressure sensing
valve DSV5.
Clean valve. Check O-rings on valve. Check
operation of valve. Repair or replace valve as
required.
3. Stuck or defective check valve CV12. Clean valve. Check operation of valve. Repair or
replace valve as required.
4. Stuck or defective jib up valve 4H-35. Clean valve. Check operation of valve. Repair or
replace valve as required.
5. Stuck or defective counterbalance valve CB12. Clean valve. Check O-rings on valve. Repair or
replace valve as required.
6. Defective jib cylinder C1. Check seals on cylinder. Replace as necessary.
Replace cylinder if defective.
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