Skyjack SJ46 AJ+ Service Manual

189
229042ABASJ46 AJ+, SJ46 AJ, SJ51 AJ
Hydraulic System Section 4 – Troubleshooting Information
4.5-21 Platform will not Level Up Manually
1. Plugged, incorrectly adjusted or defective orifice
OR4.
Check orifice. Replace if plugged or defective.
2. Stuck or defective platform level down valve 4H-
41.
Clean valve. Check operation of valve. Repair or
replace valve as required.
3. Stuck or defective shuttle valve SV7. Clean valve. Check O-rings on valve. Check
operation of valve. Repair or replace valve as
required.
4. Stuck or defective shuttle valve SV8. Clean valve. Check O-rings on valve. Check
operation of valve. Repair or replace valve as
required.
5. Stuck or defective check valve CV4. Clean valve. Check O-rings on valve. Check
operation of valve. Repair or replace valve as
required.
6. Stuck or defective relief valve RV9. Set valve to specifications. Check O-rings and
clean valve. Repair or replace valve as required.
7. Stuck or defective counterbalance valve CB7. Clean valve. Check O-rings on valve. Repair or
replace valve as required.
8. Stuck or defective check valve CV9. Clean valve. Check operation of valve. Repair or
replace valve as required.
9. Defective leveling cylinder C4 or slave cylinder
C5.
Check seals on cylinder. Replace as necessary.
Replace cylinder if defective.
4.5-22 Brake will not Release
1. Stuck or defective shuttle valve SV2. Clean valve. Check O-rings on valve. Check
operation of valve. Repair or replace valve as
required.
2. Defective or misadjusted pressure reducing valve
PR1.
Set valve to specifications. Check O-rings and
clean valve. Repair or replace valve as required.
3. Stuck or defective brake valve 3H-26. Clean valve. Check O-rings on valve. Check
operation of valve. Repair or replace valve as
required.
4. Stuck or defective shuttle valve SV1. Clean valve. Check O-rings on valve. Check
operation of valve. Repair or replace valve as
required.
5. Defective or misadjusted relief valve RV4. Set valve to specifications. Check O-rings and
clean valve. Repair or replace valve as required.
6. Stuck or defective brake release override valve
V1.
Clean valve. Check O-rings on valve. Repair or
replace valve as required.
7. Bypassing or defective brake hand pump V3. Clean valve. Check O-rings on valve. Repair or
replace valve as required.
8. Bypassing or defective brake cylinder C12. 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