PROBLEM 11
Front or rear load drum will not lower load, but will raise load.
POSSIBLE CAUSES
Pawl in. Control handle is worn. Minimum bail limit opened.
Pump is worn. Speed sender is bad.
CHECKS
Check Diagnostic Screen D2. (See Diagnostic Display topic in this section of manual.) When
applicable switch was enabled…
Bank 1 changed by 4 (front), 8 (left rear), or 128 (right rear). . . . . . . . . . . Minimum bail limit
Bank Number Increased
by Number Shown
Bank Number Not Increased
by Number Shown
Diagnostic DRUM 1, 2, or 3 screen (bank 1) approaches
100% handle control with handle moved forward.
Check for problem.
Repair limit switch,
wiring, or fuse.
Repair or replace control handle.
Diagnostic DRUM 1, 2, or 3 screen (bank 2) approaches
100% pump control with handle moved forward.
Consult the Manitowoc
Crane Care Lattice
Tea m.
Use test plug adapter. (See Test 14—Checking
System Voltage at the Air Solenoid Panel.) Are
12 volts present at brake solenoid valve when
control handle is moved?
(See Test 4—Testing
the Pump EDC and
Motor PCP.)
Repair or replace wiring or consult dealer/factory.
Yes No
Yes
No
Yes
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