
Reference
Only
TROUBLESHOOTING
18000 SERIVCE/MAINTENANCE MANUAL
10-14
Published 12-05-17, Control # 035-23
Problem 12
No boom hoist operation.
POSSIBLE CAUSES
Boom hoist brake not releasing; Boom hoist 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
Is 1 displayed after brake on boom hoist screen?
Engine loads when moving problem handle in either direction?
Yes
No
Consult dealer/factory.
Repair or replace wiring.
Is 24 volts present at brake solenoid when
problem handle is moved? (See Section 3 -
Checking Electrical Inputs/Outputs).
Yes
No
When moving handle fully in both directions, does DRUM 4 screen
approach 100% handle control in each direction?
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
When moving handle fully in both directions,
does DRUM 4 screen approach 100%
pump control command for each pump?
Is voltage at handle more than 0 with
handle moved? (See Section 3 -
Checking Electrical Inputs/Outputs).
Consult dealer/factory.
Correct problem.
Is there an operating or system fault?
Replace pump(s) EDC.
Manually stroke pump. (See Section 2 - Manual Override Tests).
Does pump pressurize?
Is 0.1 to 2.0 volts present at pump(s) EDC?
Repair or replace wiring or
consult dealer/factory.
Isolate pump. Does manually stroked pump pressurize?
Repair or replace
motor(s).
Repair or replace
pump(s).
Consult factory/dealer.
Yes
No
Move switch to
off position.
Is pressure at drum brake(s) and drum
valve(s) more than 300 psi (21 bar)?
Repair or replace
drum brake/valve(s).
Yes
No
Is there only partial charge pressure
at drum brake(s)?
Replace system pump or
brake valve block at motor.
Yes
No
Set charge pump
relief pressure.
Is there 24 volts to brake valve(s) coil?
Yes
No
Repair or replace wiring.
Repair or replace drum
brake/valve(s).
Is 24 volts available to switch?
Yes
No
Содержание 18000
Страница 1: ...R e f e r e n c e O n l y Service Maintenance Manual Manitowoc 18000 ...
Страница 2: ...R e f e r e n c e O n l y ...
Страница 4: ...R e f e r e n c e O n l y THE ORIGINAL LANGUAGE OF THIS PUBLICATION IS ENGLISH ...
Страница 210: ...R e f e r e n c e O n l y NOTES SKETCHES AND PHOTOGRAPHS ...
Страница 315: ...R e f e r e n c e O n l y ...
Страница 316: ...R e f e r e n c e O n l y ...