Skyjack SJ61T Service Manual

Telescopic Boom Series
Models SJ61T & SJ66T
194312
December 2007 Page 123
Section 4 - Troubleshooting Information Service and Maintenance
8. Loose or broken wire #37 from platform terminal block to platform rotate right valve 4H-37.
- Check continuity. Replace if defective.
9. Loose or broken wire #02 from platform terminal block to platform rotate right valve 4H-37.
- Check continuity. Replace if defective.
10. 10. Defective platform rotate right valve coil 4H-37.
- Check continuity and resistance through coil. Replace if defective.
4.1-22 No Platform Rotate Left or Right from Base Control Console
1. Open resistor R2.
- Check resistor for 10 ohms (66T) or 13 ohms (61T). If no resistance found, replace resistor.
2. Loose or broken wire #35A from resistor R2 to base key switch S2.
- Check continuity. Replace if defective.
3. Open or defective base key switch S2.
- Select base control on switch. Check continuity through switch. Replace if defective.
4. Loose or broken wire #42 from base key switch S2 to turret harness plug pin #16.
- Check continuity. Replace if defective.
5. Loose or broken wire #42 from turret harness plug pin #16 to proportional ow enable valve 2H-42.
- Check continuity. Replace if defective.
6. Loose or broken wire #02 from turret harness plug to proportional ow enable valve 2H-42.
- Check continuity. Replace if defective.
7. Defective proportional ow enable valve coil 2H-42.
- Check continuity and resistance through coil. Replace if defective.
4.1-23 No Jib Up from Base Control Console
1. Loose or broken wire #10A from ignition/ pump switch S5 to jib switch S17.
- Check continuity. Replace if defective.
2. Defective jib up switch S17.
- Check continuity through switch while activating jib up function between wires #10A and #35.
If no continuity found, replace switch.
3. Open or defective diode D35-1.
- Check diode. Replace if defective.
4. Loose or broken wire #35A from diode D35-1 to resistor R2.
- Check continuity. Replace if defective.
5. Loose or broken wire #35 from jib up switch S17 to base connector plug A pin #17.
- Check continuity. Replace if defective.
6. Loose or broken wire #35 in boom cable A or its connectors.
- Check for continuity between pins #17 on cable A. Check for loose or corroded connections
on cable connectors. Replace if wire is defective.
7. Loose or broken wire #35 from plug A pin #17 to platform terminal block.
- Check continuity. Replace if defective.
8. Loose or broken wire #35 from platform terminal block to jib up valve 4H-35.
- Check continuity. Replace if defective.
9. Loose or broken wire #02 from platform terminal block to jib up valve 4H-35.
- Check continuity. Replace if defective.
10. 10. Defective jib up valve coil 4H-35.
- Check continuity and resistance through coil. Replace if defective.
4.1-24 No Jib Down from Base Control Console
1. Loose or broken wire #10A from ignition/ pump switch S5 to jib switch S17.
- Check continuity. Replace if defective.
2. Defective jib down switch S17.
- Check continuity through switch while activating jib down function between wires #10A and
#34. If no continuity found, replace switch.

Skyjack SJ61T Specifications

General

Brand	Skyjack
Model	SJ61T
Category	Lifting Systems
Language	English