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Electrical System
4.2-10 No Platform Rotate
No Platform Rotate Right from Base:
1. Loose or broken wire #10C from resistor R1 to
R5.
2. Defective resistor R5.
3. Loose or broken wire #10F from resistor R5 to
platform rotate switch S16.
4. Defective platform rotate switch S16.
5. Loose or broken wire #37B from platform rotate
switch S16 to plug A pin 19.
6. Loose or broken wire #37B in boom cable A or
its connectors.
7. Loose or broken wire #37B from plug A pin #19
to platform terminal block.
8. Loose or broken wire #37B from platform
terminal block to platform rotate right valve valve
4H-37B.
9. Loose or broken wire #02 from platform terminal
block to platform rotate right valve 4H-37B.
10. Defective platform rotate right valve coil 4H-37B.
11. Open or defective diode D37-1.
No Platform Rotate Right from Platform Console:
1. Loose or broken wire #04 from platform terminal
block to platform level switch S20.
2. Defective platform level switch S20.
3. Loose or broken wire 37A from S21 to J3 pin #28
of valve driver.
4. No output on J2 pin #24 of the valve driver to
wire #20B.
5. No output on J2 pin #35 of the valve driver to
wire #37.
6. Loose or broken wire 37 from J2 pin #35 of valve
driver to platform terminal strip.
SJ85 AJ
Section 4 – Troubleshooting Information
Check continuity. Replace if defective.
Check resistor, replace if defective.
Check continuity. Replace if defective.
Check continuity through switch while activating up
function between wires #10C and #37B. Replace
switch if no continuity.
Check continuity. Replace if defective.
Check continuity. Replace if defective.
Check continuity. Replace if defective.
Check continuity. Replace if defective.
Check continuity. Replace if defective.
Check continuity and resistance through coil.
Replace if defective.
Check diode. Replace if defective.
Check continuity. Replace if defective.
Check continuity through switch while activating
function between wires #4 and #36A. Replace
switch if no continuity.
Check continuity. Replace if defective.
Check for 12 volts. If no voltage present with foot
on footswitch check section 5 for OCM pin voltage
reference.
Check for a minimum 3.5 volts. If no voltage
present with foot on footswitch check section 5 for
OCM pin voltage reference.
Check continuity. Replace if defective.
229044ADA
119
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