PROBLEM 14
Boom will not boom up, but will boom down.
POSSIBLE CAUSES
Boom maximum up limit opened; Pump is damaged;
Equalizer/boom stop limit opened; Control handle is worn.
CHECKS
When 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 boom/mast hoist handle fully back, does Diagnostic
screen show 100% handle command in raise direction?
Check for problem. Repair limit
switch, wiring, or circuit breaker.
Yes No
Yes No
Yes No
Yes No
Does Diagnostic screen read 100% pump control
with handle moved back?
Replace control handle.
Is 28 volts present (full speed) at pump EDC when control
handle is moved back? (See Section 3 - Checking Electrical
Inputs/Outputs.)
Does pump charge pressure at charge pressure port drop to
247 psi (17 bar) or less when booming up?
Repair or replace wiring.
Replace pump EDC.Repair or replace pump.
Any of the above displayed
None of the above displayed
Consult Manitowoc dealer or
Crane Care Lattice Team.
To Next Page
Loading...
Need help?
General
