PROBLEM 16
Boom will not boom up, but will boom down.
POSSIBLE CAUSES
Maximum bail limit opened; Pump is worn; Boom maximum up limit opened;
Equalizer/boom stop limit opened; Control handle is worn.
CHECKS
Check Diagnostic Screen D2. (See Diagnostic Display topic in this section of manual.)
When applicable switch was enabled…
Bank 1 changed by 2 (front), 16 (left rear), or 64 (right rear) . . . . . . . . . . . Maximum bail limit
Bank 2 changed by 32 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Maximum up limit
Bank 6 changed by 32 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Equalizer/boom stop limit
Bank number increased
by number shown.
Bank number not increased
by number shown.
Diagnostic DRUM 4 screen (bank 1) approaches +100%
handle control with handle moved back.
Check for problem. Repair
limit switch, wiring, or fuse.
Yes No
Yes No
Yes No
Yes No
Diagnostic DRUM 4 screen (bank 1) approaches +100%
handle control with handle moved back.
Repair or replace control handle.
Use test plug adapter. (See Te s t
5.) Are -2.3 or more volts present
at pump EDC when control handle is moved back?
Consult dealer/factory.
Can boom pump be manually stroked down? (See Tes t
5.)
Repair or replace wiring or consult dealer/factory.
Replace pump EDC.
Repair or replace pump.
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