Telescopic Boom Series
Models SJ61T & SJ66T
194312
December 2007 Page 135
Section 4 - Troubleshooting Information Service and Maintenance
4.1-45 Brake will not Release
1. No output on pin #10 from valve driver to wire #26 when operating a drive function.
- Check pin #10 for 12 volts. If no voltage present with foot on footswitch check section 5 for
OCM pin voltage reference.
2. Loose or broken wire #26 from valve drive pin #10 to plug A pin #11 in platform control console.
- Check continuity. Replace if defective.
3. Loose or broken wire #26 in Cable A or its connectors.
- Check for continuity between pins #11 on cable A. Check for loose or corroded connections
on cable connectors. Replace if wire is defective.
4. Loose or broken wire #26 from base plug A pin #11 to turret harness plug pin #8.
- Check continuity. Replace if defective.
5. Loose or broken wire #26 or #02 from turret harness plug to brake valve 3H-26.
- Check continuity. Replace if defective.
6. Defective brake valve coil 3H-26.
- Check continuity and resistance through coil. Replace if defective.
4.1-46 No Drive and Steer
NOTE
Aerial platform will not drive or steer if it is tilted and off limit switches.
1. Loose or broken wire #4 from platform terminal block to drive joystick A2 in platform control console.
- Check continuity. Replace if defective.
2. Loose or broken wire #02 from platform terminal block to drive joystick A2.
- Check continuity. Replace if defective.
3. Defective drive joystickA2.
- See drive joystick test procedure in section 5.
4.1-47 No Forward Drive
1. No output on “D" when forward is selected on drive joystick A2.
- See drive joystick test procedure in section 5.
2. Loose or broken wire "D-signal" from drive joystick A2 to valve driver pin #27.
- Check continuity. Replace if defective.
3. No output from valve driver pin #34 to wire #16.
- Check pin #34 for minimum 2 volts. If no voltage present with foot on footswitch check section
5 for OCM pin voltage reference.
4. Loose or broken wire #16 from valve driver pin #34 to plug B pin #5 in platform control console.
- Check continuity. Replace if defective.
5. Loose or broken wire #5 in cable B or its connectors.
- Check for continuity between pins #5 on cable B. Check for loose or corroded connections on
cable connectors. Replace if wire is defective.
6. Loose or broken wire #16 from base plug B pin #5 to turret harness plug pin #21.
- Check continuity. Replace if defective.
7. Loose or broken wire #16 or #02 from turret harness plug to forward drive valve 3H-16.
- Check continuity. Replace if defective.
8. Defective forward drive valve coil 3H-16.
- Check continuity and resistance through coil. Replace if defective.
4.1-48 No Reverse Drive
1. No output on “D" when forward is selected on drive joystick A2.
- See drive joystick test procedure in section 5.
2. Loose or broken wire "D-signal" from drive joystick A2 to valve driver pin #27.
- Check continuity. Replace if defective.
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