Skyjack SJ46 AJ+ Service Manual

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229042ABA SJ46 AJ+, SJ46 AJ, SJ51 AJ
Section 4 – Troubleshooting Information Hydraulic System
4.5-6 No Riser Boom Down
1. Stuck or defective riser down valve 4H-30. 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. Plugged or defective orifice OR6. Check orifice. Replace if plugged or defective.
4. Stuck or defective check valve CV6. Clean valve. Check O-rings on valve. Check
operation of valve. Repair or replace valve as
required.
5. Stuck or defective relief valve RV8. Set valve to specifications. Check O-rings and
clean valve. Repair or replace valve as required.
6. Stuck or defective check valve CV8. Clean valve. Check operation of valve. Repair or
replace valve as required.
7. 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.
8. Stuck or defective counterbalance valve CB5 or
CB6.
Clean valve. Check O-rings on valve. Repair or
replace valve as required.
9. Defective riser cylinder C6 or C7. Check seals on cylinder. Replace as necessary.
Replace cylinder if defective.
4.5-7 Riser Boom Down Jerky
1. Stuck open or defective check valve CV5. Clean valve. Check operation of valve. Repair or
replace valve as required.
2. Stuck or incorrectly set counterbalance valve CB5
or CB6.
Clean valve. Check O-rings on valve. Check
operation of valve. Repair or replace valve as
required.
4.5-8 No Turret Rotate Left
1. Stuck or defective rotate left valve 4H-32. Clean valve. Check operation of valve. Repair or
replace valve as required.
2. Stuck or defective shuttle valve SV4. Clean valve. Check O-rings on valve. Check
operation of valve. Repair or replace valve as
required.
3. Stuck or defective relief valve RV7. Set valve to specifications. Check o-rings and
clean valve. Repair or replace valve as required.
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Skyjack SJ46 AJ+ Specifications

General

Brand	Skyjack
Model	SJ46 AJ+
Category	Boom Lifts
Language	English