PROBLEM 15
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
Does diagnostic DRUM 4 screen (bank 1) approach
+100% handle control with handle moved back?
Check for problem. Repair
limit switch, wiring, or fuse.
Yes No
Yes No
Yes No
Yes No
Does diagnostic DRUM 4 screen (bank 1) approach
+100% handle control with handle moved back?
Repair or replace control handle.
Use test plug adapter. (See Test 4—Testing the Pump EDC and Motor PCP
.)
Are -2.3 or more volts present at pump EDC when control handle is moved
back?
Consult the Manitowoc
Crane Care Lattice Team.
Can boom pump be manually stroked down? (See Test 10—Manually
Stroking the Pump.)
Repair or replace wiring or consult the Manitowoc Crane Care Lattice Team.
Replace pump EDC.
Repair or replace pump.
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