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 flow enable valve 2H-42.
-
Check continuity. Replace if defective.
8.
Loose or broken wire #02 from turret harness plug to proportional flow enable valve 2H-42.
-
Check continuity. Replace if defective.
9.
Defective proportional flow 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.
Summary of Contents for SJ61T
Page 1: ...TELESCOPIC BOOMS MODELS SJ61T SJ66T 194312AE February 2017 SERVICE MANUAL...
Page 42: ...Page 42 December 2007 Telescopic Boom Series Models SJ61T SJ66T 194312 Notes...
Page 230: ...Page 230 December 2007 Telescopic Boom Series Models SJ61T SJ66T 194312 Notes...
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