Skyjack SJ63 AJ+ Service Manual

180
SJ63 AJ+, SJ63 AJ229043AAA
Section 4 – Troubleshooting Information Hydraulic System - ANSI/CSA
4.5-15 The Platform will not Level Down Manually
1. Plugged or defective orifice OR3. Check orifice. Replace if plugged or defective.
2. Stuck or defective platform level down valve 5H-
40.
Clean valve. Check operation of valve. Repair or
replace valve as required.
3. Stuck or defective check valve CV7. Clean valve. Check O-rings on valve. Check
operation of valve. Repair or replace valve as
required.
4. Stuck or defective dual pilot check valve
DPOCV2.
Clean valve. Check O-rings on valve. Check
operation of valve. Repair or replace valve as
required.
5. Stuck or defective shuttle valve SV1. Clean valve. Check O-rings on valve. Check
operation of valve. Repair or replace valve as
required.
6. Stuck or defective relief valve RV3. Set valve to specifications. Check O-rings and
clean valve. Repair or replace valve as required.
7. Stuck or defective counterbalance valve CB11. Clean valve. Check O-rings on valve. Repair or
replace valve as required.
8. Stuck or defective check valve CV4. Clean valve. Check O-rings on 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.
4.5-16 The Platform will not Level Up Manually
1. Plugged or defective orifice OR3. Check orifice. Replace if plugged or defective.
2. Stuck or defective platform level up valve 5H-41. Clean valve. Check operation of valve. Repair or
replace valve as required.
3. Stuck or defective check valve CV7. Clean valve. Check O-rings on valve. Check
operation of valve. Repair or replace valve as
required.
4. Stuck or defective dual pilot check valve
DPOCV2.
Clean valve. Check O-rings on valve. Check
operation of valve. Repair or replace valve as
required.
5. Stuck or defective shuttle valve SV1. Clean valve. Check O-rings on valve. Check
operation of valve. Repair or replace valve as
required.
6. Stuck or defective relief valve RV3. Set valve to specifications. Check O-rings and
clean valve. Repair or replace valve as required.
7. Stuck or defective counterbalance valve CB10. Clean valve. Check O-rings on valve. Repair or
replace valve as required.
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Skyjack SJ63 AJ+ Specifications

General

Brand	Skyjack
Model	SJ63 AJ+
Category	Boom Lifts
Language	English