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 hoist pump pressure - raise, no increase in system pressure.
When moving boom 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 24 volts present (full speed) at pump EDC when control
handle is moved back?
(See Section 3 - Checking Electrical Inputs/Outputs.)
Consult dealer/factory.
Does pump charge pressure at charge pressure port drop to
247 psi (17 bar) or less when booming up?
Repair or replace wiring or consult dealer/factory.
Replace pump EDC.Repair or replace pump.
Any of the above displayed
None of the above displayed
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