PROBLEM 10
Front or rear load drum will not raise load, but will lower load.
POSSIBLE CAUSES
Block-up limit is opened. Pump is worn. Rated capacity indicator/limiter (RCL) circuit is open. Control
handle is worn. Maximum bail limit is opened. Speed sender is bad.
CHECKS
Check diagnostic screen D2. When applicable switch is enabled…
Bank 1 changed by 2 (front), 16 (left rear), or 64 (right rear) . . . . . . . . . . . Maximum bail limit
Bank 1 changed by 32. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Block up limit
Bank 6 changed by 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . RCL
All Bank Numbers Increased
by Number Shown
Any Bank Number Not Increased
by Number Shown
Diagnostic DRUM 1, 2, or 3 screen (bank 1) approaches
+100% handle control with handle moved back.
Yes No
Check for problem and repair limit
switch operation, wiring, or fuse.
Repair or replace control handle.
Diagnostic DRUM 1, 2, or 3 screen (bank 2) approaches
+100% pump control with handle moved back.
Yes
No
Consult the Manitowoc
Crane Care Lattice Team.
Is +2.3 or more volts present at pump EDC with
handle moved back? (See Test 4—Testing the
Pump EDC and Motor PCP.)
Replace pump EDC
or replace pump.
Repair or replace wiring
or consult dealer/factory.
Yes
No
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