PROBLEM 15
Boom hoist will not reach maximum speed.
POSSIBLE CAUSES
Partial control voltage from handle to PC; Partial control voltage from PC to pump EDC;
Pump or motor worn.
CHECKS
When moving boom hoist control handle fully in both directions, diagnostic DRUM
4 screen (bank 1) obtains 100% handle control in each direction.
Yes No
Yes No
Yes No
Voltage and
coil Ok
Voltage and/or
coil not Ok
When moving boom hoist control handle fully in both
directions, diagnostic DRUM 4 screen (bank 2) obtains
100% pump control in each direction.
Repair or replace control handle.
When raising or lowering boom with full handle actuation, diagnostic
DRUM 4 screen (bank 3) obtains 100% pump control in each direction.
Consult dealer/factory.
Check for control voltage and coil resistance at
pump EDC and motor PCP. (See Tes t
5.)
Check for pump and motor
leakage. (See Te s t
8.)
Repair or replace coil or wiring.
Repair or replace pump or
motor if bad.
Consult dealer/factory.
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