PROBLEM 14
The boom will not boom up, but will boom down.
POSSIBLE CAUSES
The boom maximum up limit opened, the pump is damaged,
equalizer/boom stop limit opened, the control handle is worn.
CHECKS
When the applicable switch or handle is enabled is the following displayed:
Maximum boom up limit fault.
Boom/mast hoist pump pressure - raise, no increase in system pressure.
When moving the boom/mast hoist handle fully back, does the
Diagnostic screen show 100% handle command in the raise direction?
Check for the problem. Repair the
limit switch, wiring, or circuit
breaker.
Yes No
Yes No
Yes No
Yes No
Does the Diagnostic screen read 100% pump control
with the handle moved back?
Replace the control handle.
Are 28 volts present (full speed) at the pump EDC when the
control handle is moved back? (See Section 3 - Checking
Electrical Inputs/Outputs.)
Does the pump charge pressure at the charge pressure port
drop to 17 bar (247 psi) or less when booming up?
Repair or replace the wiring.
Replace the pump EDC.Repair or replace the pump.
Any of the above displayed
None of the above displayed
Consult your Manitowoc dealer or the
Crane Care Lattice Team.
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