DS 350 G Boom Control Troubleshooting- TMS/TTS870 / RT865 BXL
031-300-190-039 Rev. B 4/30/99
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16. No Extend or Retract Function in Automode
Boom does not extend or retract
in automode.
Defect in crane electric or hydraulic circuit.
Reset crane fuse breaker. Check LMI fuses
in the central unit enclosure. Refer to
section 9.3, 10.1 and 10.2.
No
Switch to manual mode and extend or
retract the boom manually.
Does the
boom extend or
retract?
Yes
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Yes
Faulty wiring to extend pressure switch or
defective pressure switch. Correct the
wiring and replace the switch if defective.
No
Switch to automode. Start the engine and operate the
extend control. Measure the voltage at central unit
terminal A104 X1/38 (24V) and A104X1/37 (GND) while
operating the extend control.
Is the voltage correct?
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