Skyjack SJ61T Service Manual

Page 130 December 2007
Telescopic Boom Series
Models SJ61T & SJ66T
194312
Section 4 - Troubleshooting InformationService and Maintenance
9. Loose or broken wire #38 from valve driver pin #9 to plug B pin #8 in platform control console.
- Check continuity. Replace if defective.
10. Loose or broken wire #38 in boom cable B or its connectors.
- Check for continuity between pins #8 on cable B. Check for loose or corroded connections
onable connectors. Replace if wire is defective.
11. Loose or broken wire #38 from base connector plug B pin #8 to base terminal block.
- Check continuity. Replace if defective.
12. Loose or broken wire #38 from base terminal block to turret harness plug pin #12.
- Check continuity. Replace if defective.
13. Loose or broken wire #38 from turret harness plug pin #12 to telescope in valve 3H-38.
- Check continuity. Replace if defective.
14. Loose or broken wire #02 from turret harness plug to telescope in valve 3H-38.
- Check continuity. Replace if defective.
15. Defective telescope in valve coil 3H-38.
- Check continuity and resistance through coil. Replace if defective.
4.1-36 No Telescope Out from Platform Control Console
1. Loose or broken purple wire from speed controller to resistor R9 in platform control console.
- Check continuity. Replace if defective.
2. Open or defective resistor R9.
- Check resistor. Replace if defective.
3. Loose or broken wire #38B from resistor R9 to telescope switch S18.
- Check continuity. Replace if defective.
4. Open or defective resistor R10.
- Check resistor. Replace if defective.
5. Defective telescope switch S18.
- Check continuity through switch while activating the function between wires #38C and #38A.
6. Loose or broken wire #38A from telescope switch S18 to valve driver pin #32.
- Check continuity. Replace if defective.
7. Voltage out of range at valve driver pin #32.
- Check voltage while operating telescope out. Voltage should be between 2.25 and 2.75 volts.
Refer to telescope voltage reference table in section 5 if out of this range.
8. No output on pin #5 of the valve driver to wire #20B.
- Check pin #5 for 12 volts. If no voltage present with foot on footswitch check section 5 for
OCM pin voltage reference.
9. No output on pin #12 of the valve driver to wire #39.
- Check pin #12 for minimum 3.5 volts. If no voltage present with foot on footswitch check section
5 for OCM pin voltage reference.
10. Loose or broken wire #39 from valve driver pin #12 to plug B pin #9 in platform control console.
- Check continuity. Replace if defective.
11. Loose or broken wire #39 in boom cable B or its connectors.
- Check for continuity between pins #9 on cable B. Check for loose or corroded connections on
cable connectors. Replace if wire is defective.
12. Loose or broken wire #39 from base connector plug B pin #9 to base terminal block.
- Check continuity. Replace if defective.
13. Loose or broken wire #39 from base terminal block to turret harness plug pin #13.
- Check continuity. Replace if defective.
14. Loose or broken wire #39 from turret harness plug pin #13 to telescope out valve 3H-39.
- Check continuity. Replace if defective.
15. Loose or broken wire #02 from turret harness plug to telescope out valve 3H-39.
- Check continuity. Replace if defective.
16. Defective telescope out valve coil 3H-39.
- Check continuity and resistance through coil. Replace if defective.

Skyjack SJ61T Specifications

General

Brand	Skyjack
Model	SJ61T
Category	Lifting Systems
Language	English