Skyjack SJ61T - 49 No High Speed Drive

Page 136 December 2007
Telescopic Boom Series
Models SJ61T & SJ66T
194312
Section 4 - Troubleshooting InformationService and Maintenance
3. No output from valve driver pin #23 to wire #15.
- Check pin #23 for minimum 2 volts. If no voltage present with foot on footswitch check section
5 for OCM pin voltage reference.
4. Loose or broken wire #15 from valve driver pin #23 to plug B pin #4 in platform control console.
- Check continuity. Replace if defective.
5. Loose or broken wire #15 in cable B or its connectors.
- Check for continuity between pins #4 on cable B. Check for loose or corroded connections on
cable connectors. Replace if wire is defective.
6. Loose or broken wire #15 from base plug B pin #4 to turret harness plug pin #20.
- Check continuity. Replace if defective.
7. Loose or broken wire #15 or #02 from turret harness plug to reverse drive valve 3H-15.
- Check continuity. Replace if defective.
8. Defective reverse drive valve coil 3H-15.
- Check continuity and resistance through coil. Replace if defective.
4.1-49 No High Speed Drive
NOTE
Aerial platform must be level and boom must be below 15 degrees
and fully retracted for high speed drive.
1. Loose or broken wire #09 from base terminal block to limit switch LS2.
- Check continuity. Replace if defective.
2. Open or defective limit switch LS2.
- Ensure boom is below 15 degrees. Adjust switch if required. Check continuity through switch.
Replace if required.
3. Loose or broken wire #29 from limit switch LS2 to base terminal block.
- Check continuity. Replace if defective.
4. Loose or broken wire #29 from base terminal block to limit switch LS3.
- Check continuity. Replace if defective.
5. Open or defective limit switch LS3.
- Ensure boom is fully retracted. Adjust switch if required. Check continuity through switch.
Replace if defective.
6. Loose or broken wire #59 from limit switch LS3 to base terminal block.
- Check continuity. Replace if defective.
7. Loose or broken wire #59 from base terminal block to plug B pin #15.
- Check continuity. Replace if defective.
8. Loose or broken wire #59 in boom cable B or its connectors.
- Check for continuity between pins #15 on cable B. Check for loose or corroded connections
on cable connectors. Replace if wire is defective.
9. Loose or broken wire #59 from plug B pin #15 in platform control console to platform terminal block.
- Check continuity. Replace if defective.
10. Loose or broken wire #59 from platform terminal block to valve driver pin #31.
- Check continuity. Replace if defective.
11. Defective valve driver channel input for high drive enable.
- See section 5 for OCM pin voltage reference.
12. Loose or broken wire #59 from platform terminal block to torque switch S48.
- Check continuity. Replace if defective.
13. Open or defective torque switch S48.
- Check continuity through switch while activating low torque function between wires #59 and
#45. If no continuity found replace switch.
14. Loose or broken wire #45 from torque switch S48 to plug A pin #20 in platform control console.
- Check continuity. Replace if defective.