Problem 16
No luffing jib (drum 6) operation.
POSSIBLE CAUSES
Luffing jib drum brake is not releasing; Pawl not released or hung up; No voltage through control
handle to controller; No voltage out of controller to pump EDC; Node fault; Wiring or switch is faulty.
CHECKS
Check drum brake signal and pressure; Check drum handle command in problem direction; Check computer signal to
brake solenoid, pump EDC and motor PCP; Check pump and motor pressure; Check DOS items on DRUM screen.
Yes
No
Engine loads when moving problem handle in either direction?
Yes No
Consult dealer/factory.
Move switch
to off position.
Is 24 volts present at brake solenoid when problem
handle is moved? (See Section 3 - Checking
Electrical Inputs/Outputs).
Yes No
Repair or replace wiring or switch.
Consult dealer/factory.
When moving handle fully in both directions, does DRUM 6 screen
approach 100% handle control in each direction?
Yes
No
Yes
No
Yes
No
Yes No
Yes No
Yes
No
Yes No
Yes
No
Yes
No
When moving handle fully in both
directions, does DRUM 6 screen approach
100% pump control command for pump?
Is voltage at handle more than 0
with handle moved?
Is pressure at brake and brake valve
300 psi (21 bar) or more?
Consult dealer/factory.Correct problem.
Is there an operating or system fault?
Repair or replace brake
or brake valve.
Replace damaged system
brake valve block at motor.
Is there only partial charge pressure
at drum brake?
Set charge pump
relief pressure.
Replace pump EDC.
Manually stroke pump. (See Section 2 - Manual Override Tests).
Does pump pressurize?
Is 0.1 to 2.0 volts present at pump EDC?
Repair or replace wiring or
consult dealer/factory.
Isolate pump. Does manually stroked
pump pressurize?
Repair or replace
motor.
Repair or replace
pump.
Consult factory/dealer.
Yes
No
Yes
No
Is there 24 volts to brake valve or coil?
Repair or replace wiring.
Is 1 displayed after brake on drum screen?
Yes
No
Is 24 volts available at brake switch?
Repair or replace wiring.
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