Skyjack SJ30ARJE User Manual

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SJ30AJE, SJ30ARJE196274AF
Section 4 – Troubleshooting Information Hydraulic System
4.3 Hydraulic System
4.3-1 All Controls Inoperative
1. Broken or defective drive pump shaft or coupling. Check pump shaft and coupling. Replace if
defective.
2. Hydraulic oil level low. Check oil level. Fill to proper level.
3. Stuck or defective relief valve RV3. Set valve to specifications. Check O-rings and
clean valve. Repair or replace valve as required.
4. Stuck or defective relief valve RV1. Set valve to specifications. Check O-rings and
clean valve. Repair or replace valve as required.
5. Stuck or defective check valve CV4. Clean valve. Check operation of valve. Repair or
replace valve as required.
6. System pump P1 defective. Test pump with flow meter. Replace if defective.
4.3-2 No Main Boom Up
1. Stuck or defective lift up valve 4H-14. Clean valve. Check operation of valve. Repair or
replace valve as required.
2. Stuck or defective counterbalance valve CB1 or
CB2.
Clean valve. Check O-rings on valve. Repair or
replace valve as required.
3. Defective lift cylinder C2. Check seals on cylinder. Replace as necessary.
Replace cylinder if defective.
4.3-3 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 counterbalance valve CB1 or
CB2.
Clean valve. Check O-rings on valve. Repair or
replace valve as required.
3. Defective lift cylinder C2. Check seals on cylinder. Replace as necessary.
Replace cylinder if defective.

Skyjack SJ30ARJE Specifications

General

Brand	Skyjack
Model	SJ30ARJE
Category	Boom Lifts
Language	English