Bank number not increased by
number shown.
Problem 15
Boom will not boom down, but will boom up.
POSSIBLE CAUSES
Boom maximum down limit opened; Pawl engaged; Pump is damaged;
Block-up limit open; Control handle is worn; Node fault; Speed encoder is damaged.
CHECKS
See Crane Diagnostics topic in Section 3 to find CAN bus packet numbers.
When applicable switch is enabled…
Maximum Boom Up Limit . . . . . . . . . . . . . Packet #69, Bank 1 changed by 128
Boom Hoist (Drum 4) Pump Pressure. . . . Packet #38, Bank 3 changed by 1 or 4
Bank number increased
by number shown.
Yes
No
Out In
Yes No
Yes
No
Yes
No
Does Packet #34, bank 3 (boom hoist pawl) change by 4
when moving brake switch?
Check for problem. Repair limit
switch, wiring, or circuit breaker.
Visually check pawl.
Check pawl operation.
Repair or replace switch
or wiring to controller.
Does DRUM 4 screen approach 100% pump control with handle moved fully forward?
Are zero volts at rest and 24 volts at full speed present at
pump EDC when control handle is moved forward?
(See Section 3 - Checking Electrical Inputs/Outputs).
Consult dealer/factory.
Repair or replace wiring or consult dealer/factory.
Replace pump(s) EDC.
Repair or replace pump(s).
Can boom pump(s) be manually stroked down?
(See Section 2 - Manual Override Tests)
.
When moving boom hoist handle fully in forward directions, does DRUM 4 screen read 100% handle
command and 2.6 to 4.5 volts in lower direction?
Yes No
Replace control
handle or repair
wiring.
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