Skyjack SJ61T Service Manual

Telescopic Boom Series
Models SJ61T & SJ66T
194312
December 2007 Page 143
Section 4 - Troubleshooting Information Service and Maintenance
5. Defective rotary actuator RA1.
- Check actuator. Repair or replace as necessary.
4.2-12 No Platform Rotation Left
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 left valve 4H-36.
- Clean valve. Check operation of valve. Repair or replace valve as required.
4. Stuck or defective counterbalance valve CB10.
- Clean valve. Check O-rings on valve. Repair or replace valve as required.
5. Defective rotary actuator RA1.
- Check actuator. Repair or replace as necessary.
4.2-13 Platform will not Level Down
1. Stuck or defective platform level down valve 4H-40.
- - Clean valve. Check operation of valve. Repair or replace valve as required.
2. Stuck or defective dual check valve DCV2.
- Clean valve. Check O-rings on valve. Check operation of valve. Repair or replace valve as
required.
3. Stuck or defective check valve CV8.
- Clean valve. Check O-rings on valve. Check operation of valve. Repair or replace valve as
required.
4. Stuck or defective shuttle valve SV3.
- Clean valve. Check O-rings on valve. Check operation of valve. Repair or replace valve as
required.
5. Stuck or defective relief valve RV3.
- Set valve to specications. Check O-rings and clean valve. Repair or replace valve as required.
6. Stuck or defective counterbalance valve CB6.
- Clean valve. Check O-rings on valve. Repair or replace valve as required.
7. Plugged orice OR2.
- Check orice. Clean if plugged or replace if defective.
8. Defective leveling cylinder C3 or slave cylinder C4.
- Check seals on cylinder. Replace as necessary. Replace cylinder if defective.
4.2-14 Platform will not Level Up
1. Stuck or defective platform level up valve 4H-41.
- Clean valve. Check operation of valve. Repair or replace valve as required.
2. Stuck or defective dual check valve DCV2.
- Clean valve. Check O-rings on 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 shuttle valve SV3.
- Clean valve. Check O-rings on valve. Check operation of valve. Repair or replace valve as
required.
5. Stuck or defective relief valve RV3.

Skyjack SJ61T Specifications

General

Brand	Skyjack
Model	SJ61T
Category	Lifting Systems
Language	English