
Reference
Only
Manitowoc
Published 12-05-17, Control # 035-23
10-9
18000 SERIVCE/MAINTENANCE MANUAL
TROUBLESHOOTING
10
Problem 7
Crawlers will not travel in either direction (one or both tracks).
POSSIBLE CAUSES
Brake valve is damaged; Control handle is worn; Pump EDC is damaged; No voltage
from handle to controller; No voltage out of controller to pump EDC; Node fault; Low
brake pressure; Wiring or switch is faulty; Pump, motor or gearbox is damaged.
CHECKS
Does TRACK screen BRAKE display 1 when problem handle is moved in problem direction? Does
DOS item on TRACK screen show a binary number or total to indicate a problem with right pump (1),
left pump (2), brake (4), or motor (8)?
Yes
No
Engine loads when moving problem handle in either direction?
No
Yes
No
Yes
Is 24 volts present at travel brake solenoid W74-
H, when problem handle is moved? (See
Section 3 - Checking Electrical Inputs/Outputs).
No
Yes
Is 24 volts present at brake switch?
Move switch
to off position.
Yes
No
Repair or replace wiring or switch.
Consult dealer/factory.
When moving problem handle fully in both directions, does TRACK screen
read 0.5 to 2.4 volts in reverse or 2.6 to 4.5 volts in forward direction?
No
Yes
Replace switch or wiring.
When moving problem handle in both
directions, does TRACK screen approach
100% pump control in each direction?
No
Yes
Is voltage at problem handle greater
than 0 with handle moved? (See Section
3 - Checking Electrical Inputs/Outputs
).
No
Yes
Repair or replace wiring.
Is pressure at brake and brake valve
more than 300 psi (21 bar)?
No
Yes
Manually stroke pump. (See Section 2 - Manual Override Tests).
Does pump pressurize?
Consult dealer/factory.
No
Yes
Repair or replace
brake or brake valve.
Replace system pump or brake valve.
Set charge pump
relief pressure.
Is there only partial charge pressure
at brake?
Is 0.1 to 2.0 volts present
at pump(s) EDC?
No
Yes
Replace 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.
No
Yes
Replace handle.
Consult dealer/factory.
Is 1 displayed after brake on screen.
Consult dealer/factory.
Is there 24 volts to brake valve coil?
No
Yes
No
Yes
Summary of Contents for 18000
Page 1: ...R e f e r e n c e O n l y Service Maintenance Manual Manitowoc 18000 ...
Page 2: ...R e f e r e n c e O n l y ...
Page 4: ...R e f e r e n c e O n l y THE ORIGINAL LANGUAGE OF THIS PUBLICATION IS ENGLISH ...
Page 210: ...R e f e r e n c e O n l y NOTES SKETCHES AND PHOTOGRAPHS ...
Page 315: ...R e f e r e n c e O n l y ...
Page 316: ...R e f e r e n c e O n l y ...