Skyjack SJ61T Service Manual

Telescopic Boom Series
Models SJ61T & SJ66T
194312
December 2007 Page 145
Section 4 - Troubleshooting Information Service and Maintenance
- Check motor. Replace if defective.
4.2-18 No Forward Drive
1. Defective pump displacement control 4H-16.
- Check control. Replace if defective.
2. Defective or misadjusted drive relief valve RV6.
- See section 5 for drive pump set up procedures.
4.2-19 No Reverse Drive
1. Defective pump displacement control 4H-15.
- Check control. Replace if defective.
2. Defective or misadjusted drive relief valve RV7.
- See section 5 for drive pump set up procedures.
4.2-20 No High Speed Drive
1. Stuck or defective 2 speed valve 3H-45.
- Clean valve. Check O-rings on valve. Check operation of valve. Repair or replace valve as
required.
2. Defective shift spool in drive motor M1.
- Check motor. Repair or replace if necessary.
4.2-21 No Right Steer
1. Stuck or defective right valve 4H-23A.
- 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 CV2.
- Clean valve. Check O-rings on valve. Check operation of valve. Repair or replace valve as
required.
4. Plugged orice OR1.
- Check orice. Clean if plugged or replace if defective.
5. Defective steer cylinder C8 for 4WD or C9 for 2WD.
- Check seals on cylinder. Replace as necessary. Replace cylinder if defective.
4.2-22 No Left Steer
1. Stuck or defective left steer valve 4H-24A.
- 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 CV3.
- Clean valve. Check O-rings on valve. Check operation of valve. Repair or replace valve as
required.
4. Plugged orice OR1.
- Check orice. Clean if plugged or replace if defective.
5. Defective steer cylinder C8 for 4WD or C9 for 2WD.
- Check seals on cylinder. Replace as necessary. Replace cylinder if defective.
4.2-23 Axle Will Not Oscillate
NOTE
Axle will only oscillate when boom is fully retracted and is no greater
than 15 degress above horizontal.

Skyjack SJ61T Specifications

General

Brand	Skyjack
Model	SJ61T
Category	Lifting Systems
Language	English