Skyjack SJ61T Service Manual

Telescopic Boom Series
Models SJ61T & SJ66T
194312
December 2007 Page 131
Section 4 - Troubleshooting Information Service and Maintenance
4.1-37 No Platform Rotate or Jib Function from Platform Control Console
1. Loose or broken wire #08 from platform terminal block to rotate switch S20 and jib switch S21.
- Check continuity. Replace if defective.
2. No output on pin #21 of the valve driver to wire #42.
- Check pin #20 for minimum 3.5 volts. If no voltage present with foot on footswitch check section
5 for OCM pin voltage reference.
3. Loose or broken wire #42 from valve driver pin #21 to plug B pin #24 in platform control console.
- Check continuity. Replace if defective.
4. Loose or broken wire #42 in boom cable B or its connectors.
- Check for continuity between pins #24 on cable B. Check for loose or corroded connections
on cable connectors. Replace if wire is defective.
5. Loose or broken wire #42 from base connector plug B pin #24 to base key switch S2.
- Check continuity. Replace if defective.
6. Loose or broken wire #42 from base key switch S2 to turret harness plug pin #16.
- Check continuity. Replace if defective.
7. Loose or broken wire #42 from turret harness plug pin #16 to proportional ow enable valve 2H-42.
- Check continuity. Replace if defective.
8. Loose or broken wire #02 from turret harness plug to proportional ow enable valve 2H-42.
- Check continuity. Replace if defective.
9. Defective proportional ow enable valve 2H-42.
- Check continuity and resistance through coil. Replace if defective.
4.1-38 No Platform Rotate Left from Platform Control Console
1. Defective platform rotate switch S20.
- Check continuity through switch while activating rotate left function between wires #08 and #36.
2. Loose or broken wire #36 from platform rotate switch S20 to platform terminal block.
- Check continuity. Replace if defective.
3. Loose or broken jumper wire #36 on platform terminal block.
- Check continuity. Replace if defective.
4. Open or defective diode D36 in platform terminal block.
- Check diode. Replace if defective.
5. Loose or broken wire #36A from platform terminal block to valve driver pin #17.
- Check continuity. Replace if defective.
6. Loose or broken wire #36 or #02 from platform terminal block to rotate left valve 4H-36.
- Check continuity. Replace if defective.
7. Defective rotate left valve coil 4H-36.
- Check continuity and resistance through coil. Replace if defective.
4.1-39 No Platform Rotate Right from Platform Control Console
1. Defective platform rotate switch S20.
- Check continuity through switch while activating rotate right function between wires #08 and
#37.
2. Loose or broken wire #37 from platform rotate switch S20 to platform terminal block.
- Check continuity. Replace if defective.
3. Loose or broken jumper wire #37 on platform terminal block.
- Check continuity. Replace if defective.
4. Open or defective diode D37 in platform terminal block.
- Check diode. Replace if defective.
5. Loose or broken wire #36A from platform terminal block to valve driver pin #17.
- Check continuity. Replace if defective.
6. Loose or broken wire #37 or #02 from platform terminal block to rotate right valve 4H-37.
- Check continuity. Replace if defective.
7. Defective rotate right Valve coil 4H-37.
- Check continuity and resistance through coil. Replace if defective.

Skyjack SJ61T Specifications

General

Brand	Skyjack
Model	SJ61T
Category	Lifting Systems
Language	English