Problem 13
Boom hoist will not reach maximum speed.
POSSIBLE CAUSES
Partial control voltage from handle to controller; Partial control voltage from controller to
pump EDC; Motor controller in low; Pump or motor is damaged; Node fault.
When moving boom hoist control handle fully in both
directions, does DRUM 4 screen read 0.5 to 2.4 volts
in raise or 2.6 to 4.5 volts in lower direction?
Yes No
Yes No
Voltage and Coil Ok
Voltage and/or Coil not Ok
When moving boom hoist control handle fully in both directions, does DRUM 4
screen approach 100% pump control for each pump?
Repair wiring/consult dealer.
Check for control voltage and coil resistance at pump EDC and motor PCP.
(See Section 3 - Checking Electrical Inputs/Outputs).
Check for pump and motor leakage.
(See Section 2 - Motor Leakage Test).
Repair or replace coil or wiring.
Clean or replace orifice.
Consult dealer/factory.
Remove plug at motor port M5 and check
orifice for obstructions. (See Section 2 -
Motor Components).
Obstruction No Obstruction
CHECKS
Check boom hoist drum speed calibration screen for 100% reading.
Yes No
Make proper adjustment.
When moving boom hoist control handle fully in both directions, does DRUM 4
screen approach 100% motor command for motor?
No
Consult dealer/factory.
Yes
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