Skyjack SJ61T Service Manual

Telescopic Boom Series
Models SJ61T & SJ66T
194312
December 2007 Page 141
Section 4 - Troubleshooting Information Service and Maintenance
- Clean valve. Check O-rings on valve. Check operation of valve. Repair or replace valve as
required.
4. Stuck or defective check valve CV4.
- Clean valve. Check O-rings on valve. Check operation of valve. Repair or replace valve as
required.
5. Stuck or defective relief valve RV2.
- Set valve to specications. Check O-rings and clean valve. Repair or replace valve as required.
6. Stuck or defective shuttle valve SV7.
- Clean valve. Check O-rings on valve. Check operation of valve. Repair or replace valve as
required.
7. Stuck or defective counterbalance valve CB1.
- Clean valve. Check O-rings on valve. Repair or replace valve as required.
8. Turret rotate brake BR1 not releasing.
- Inspect brake for worn seals or broken components. Repair and replace as necessary.
9. Worn or defective swing drive motor M2.
- Check motor. Repair or replace if defective.
4.2-7 No Boom Extend
1. Stuck or defective differential sensing valve DSV3.
- Clean valve. Check O-rings on valve. Check operation of valve. Repair or replace valve as
required.
2. Stuck or defective boom extend valve 3H-39.
- Clean valve. Check operation of valve. Repair or replace valve as required.
3. Stuck or defective check valve CV11.
- Clean valve. Check O-rings on valve. Check operation of valve. Repair or replace valve as
required.
4. Stuck or defective check valve CV6.
- 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 V5 stuck in the open position.
- Clean valve. Check operation of valve. Repair or replace valve as required.
7. Stuck or defective counterbalance valve CB4.
- Clean valve. Check O-rings on valve. Repair or replace valve as required.
8. Return valve V4 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.
4.2-8 No Boom Retract
1. 1. Stuck or defective differential sensing valve DSV3.
- Clean valve. Check O-rings on valve. Check operation of valve. Repair or replace valve as
required.
2. Stuck or defective boom retract valve 3H-38.
- Clean valve. Check operation of valve. Repair or replace valve as required.
3. Stuck or defective check valve CV10.
- Clean valve. Check O-rings on valve. Check operation of valve. Repair or replace valve as
required.
4. Stuck or defective check valve CV6.

Skyjack SJ61T Specifications

General

Brand	Skyjack
Model	SJ61T
Category	Lifting Systems
Language	English