PROBLEM 13
Boom/mast 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 damaged.
When moving boom/mast hoist control handle fully in
both directions, does Diagnostic screen show 100%
handle command in raise or lower direction?
Yes No
Yes No
Voltage and Coil Ok
Voltage and/or Coil not Ok
When moving boom/mast hoist control handle fully in both directions, does
Diagnostic screen show 100% pump control in each direction?
Repair wiring/consult dealer.
Check for control voltage and coil resistance of 17 to 19 ohms at pump EDC or to 26
ohms at 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.
Remove plug at motor port M5 and check orifice for
obstructions. (See Section 2 - Motor Components.)
Obstruction
No Obstruction
CHECKS
Check boom/mast hoist drum speed screen for 100% reading.
Yes No
Make proper
adjustment.
Consult Manitowoc dealer or
Crane Care Lattice Team.
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