PROBLEM 9
Load drum will not raise load, but will lower load.
POSSIBLE CAUSES
Block up limit is opened; Pump is damaged; Control handle is worn;
Maximum bail limit is opened; Speed sender is damaged.
CHECKS
When applicable switch or handle is enabled is the following displayed:
Boom block-up limit fault.
Luffing jib block-up limit fault.
Drum 1 pump control - raise, no increase in system pressure.
Drum 2 pump control - raise, no increase in system pressure.
Drum 3 pump control - raise, no increase in system pressure.
Any of the above displayed
None of the above displayed
Does drum Diagnostic screen show 100%
handle command with handle moved back?
Yes No
Check for problem and repair limit switch
operation, wiring, or circuit breaker.
Does drum Diagnostic screen show 100%
pump control with handle moved back?
Yes
No
Is 28 volts present (full speed) at pump EDC with handle moved fully
back? (See Section 3 - Checking Electrical Inputs/Outputs.)
Replace pump EDC
or replace pump.
Repair or replace wiring.
Yes
No
Repair or replace control handle/wiring.
Consult Manitowoc dealer or
Crane Care Lattice Team.
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