Skyjack SJ61T Service Manual

Page 132 December 2007
Telescopic Boom Series
Models SJ61T & SJ66T
194312
Section 4 - Troubleshooting InformationService and Maintenance
4.1-40 No Jib Up from Platform Control Console
1. Defective jib switch S21.
- Check continuity through switch while activating jib up function between wires #08 and #35.
2. Loose or broken wire #35 from jib switch S21 to platform terminal block.
- Check continuity. Replace if defective.
3. Loose or broken jumper wire #35 on platform terminal block.
- Check continuity. Replace if defective.
4. Open or defective diode D35 in platform terminal block.
- Check diode. Replace if defective.
5. Loose or broken wire #34A from platform terminal block to valve driver pin #33.
- Check continuity. Replace if defective.
6. Loose or broken wire #35 or #02 from platform terminal block to jib up valve 4H-35.
- Check continuity. Replace if defective.
7. Defective jib up valve coil 4H-35.
- Check continuity and resistance through coil. Replace if defective.
4.1-41 No Jib Down from Platform Control Console
1. Defective jib switch S21.
- Check continuity through switch while activating jib down function between wires #08 and #34.
2. Loose or broken wire #34 from jib switch S21 to platform terminal block.
- Check continuity. Replace if defective.
3. Loose or broken jumper wire #34 on platform terminal block.
- Check continuity. Replace if defective.
4. Open or defective diode D34 in platform terminal block.
- Check diode. Replace if defective.
5. Loose or broken wire #34A from platform terminal block to valve driver pin #33.
- Check continuity. Replace if defective.
6. Loose or broken wire #34 or #02 from platform terminal block to jib down valve 4H-34.
- Check continuity. Replace if defective.
7. Defective jib down valve coil 4H-34.
- Check continuity and resistance through coil. Replace if defective.
4.1-42 Throttle Inoperative, Mid and High (Deutz TD2.9L only)
1. Loose or broken wire #90 from base terminal block to connector J2 pin #5.
- Check continuity. Replace if defective.
2. Loose or broken wire #90 from connector P2 pin #5 94 pin ECU connector pin 80.
- Check continuity. Replace if defective.
3. Loose or broken wire #99 from base terminal block to connector J2 pin 4
- Check continuity. Replace if defective.
4. Loose or broken wire #99 from connector P2 pin 4 to 94 pin ECU connector pin 74
- Check continuity. Replace if defective.
5. Resistor R4 open or poor connection at base terminal block.
- Measure resistance (1KΩ) between 99 and 99A. Check connections. Replace if defective.
6. Resistor R5 open or poor connection at base terminal block.
- Measure resistance (3.3KΩ) between 99A and 99B. Check connections. Replace if defective.
7. Resistor R6 open or poor connection at base terminal block.
- Measure resistance (3.9KΩ) between 99B and 90. Check connections. Replace if defective.

Skyjack SJ61T Specifications

General

Brand	Skyjack
Model	SJ61T
Category	Lifting Systems
Language	English