Skyjack SJ61T Service Manual

Page 142 December 2007
Telescopic Boom Series
Models SJ61T & SJ66T
194312
Section 4 - Troubleshooting InformationService and Maintenance
- Clean valve. Check O-rings on valve. Check operation of valve. Repair or replace valve as
required.
5. Stuck or defective relief valve RV4.
- Set valve to specications. Check O-rings and clean valve. Repair or replace valve as required.
6. Return valve V4 stuck in the open position.
- Clean valve. Check operation of valve. Repair or replace valve as required.
7. Stuck or defective counterbalance valve CB5.
- Clean valve. Check O-rings on valve. Repair or replace valve as required.
8. Return valve V5 stuck in the closed position or is defective.
- Clean valve. Check operation of valve. Repair or replace valve as required.
9. Defective extension cylinder C2.
- Check seals on cylinder. Replace as necessary. Replace cylinder if defective.
4.2-9 No Jib Up
1. Stuck or defective proportional ow 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 check valve CV9.
- Clean valve. Check O-rings on valve. Check operation of valve. Repair or replace valve as
required.
3. Stuck or defective jib up valve 4H-35.
- Clean valve. Check operation of valve. Repair or replace valve as required.
4. Stuck or defective counterbalance valve CB9.
- Clean valve. Check O-rings on valve. Repair or replace valve as required.
5. Defective jib cylinder C5.
- Check seals on cylinder. Replace as necessary. Replace cylinder if defective.
4.2-10 No Jib Down
1. Stuck or defective proportional ow 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 check valve CV9.
- Clean valve. Check O-rings on valve. Check operation of valve. Repair or replace valve as
required.
3. Stuck or defective jib down valve 4H-34.
- Clean valve. Check operation of valve. Repair or replace valve as required.
4. Stuck or defective counterbalance valve CB8.
- Clean valve. Check O-rings on valve. Repair or replace valve as required.
5. Defective jib cylinder C5.
- Check seals on cylinder. Replace as necessary. Replace cylinder if defective.
4.2-11 No Platform Rotation Right
1. Stuck or defective proportional ow 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 check valve CV9.
- Clean valve. Check O-rings on valve. Check operation of valve. Repair or replace valve as
required.
3. Stuck or defective rotate right valve 4H-37.
- 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.

Skyjack SJ61T Specifications

General

Brand	Skyjack
Model	SJ61T
Category	Lifting Systems
Language	English