PROBLEM 10
Load drum will not lower load, but will raise load.
POSSIBLE CAUSES
Pawl in; Control handle is worn; Minimum bail limit opened; Pump is damaged;
Speed sender is damaged.
CHECKS
When applicable switch or handle is enabled is the following displayed:
Drum 1 minimum bail limit fault.
Drum 2 minimum bail limit fault.
Drum 3 minimum bail limit fault.
Drum 1 pump control - lower, no increase in system pressure.
Drum 2 pump control - lower, no increase in system pressure.
Drum 3 pump control - lower, no increase in system pressure.
Drum 3 pawl in fault.
Does drum Diagnostic screen show 100% handle
command with handle moved forward?
Check for problem. Repair limit
switch, wiring, or circuit breaker.
Does drum Diagnostic screen show 100% pump
control with handle moved forward?
Is 28 volts present (full speed) at pump EDC with handle moved back?
(See Section 3 - Checking Electrical Inputs/Outputs.)
Replace EDC or
replace pump.
Repair or replace wiring.
Yes No
Yes No
Yes No
Replace control handle or repair wiring.
Any of the above displayed
None of the above displayed
Consult Manitowoc dealer or
Crane Care Lattice Team.
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