PROBLEM 9
Crawlers will not travel in either direction (one or both tracks).
POSSIBLE CAUSES
Brake valve worn; Control handle worn; EDC bad; No voltage from handle to PC controller; No voltage out of PC controller to pump
EDC; Low brake pressure; Wiring or switch is bad; Pump, motor or gearbox is worn.
CHECKS
Diagnostic display TRACK screen (bank 7) displays 1 when problem handle is moved in problem direction?
Yes No
Engine loads when moving problem handle in either direction?
Is travel brake switch in OFF position?
No
Yes
NoYes
Use test plug adapter. (See Te st
10.) Is 12
volts present at hydraulic brake solenoid
(84E), when problem handle is moved?
No
Yes
Is 12 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 in both
directions, does TRACK diagnostic screen
(banks 1 or 2) obtain 100% handle control
in each direction?
NoYes
Replace switch,
fuse or wiring.
Does track turn while moving
handle and actuating manual
override on brake valve?
No
Yes
When moving problem handle in both
directions, does TRACK diagnostic
screen (banks 3 or 4) obtain 100% pump
control in each direction?
NoYes
Voltage at handle (83P or 84P) is greater
than 0 with handle moved? (See Tes t
13.)
No
Yes
Replace solenoid.
Is pressure at brake more than
300 psi?
No
Yes
Manually stroke pump (See Tes t
11.) Does pump pressurize?
Consult dealer/factory.
NoYes
Repair brake or gear box.
Is system charge pressure more
than 300 psi?
Replace brake valve.
Re-adjust charge pressure
relief or replace pump.
NoYes
Use test plug adapter. (See
Tes t
5.) Is voltage present at
pump EDC?
NoYes
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.
NoYes
Is 10 volts at handle (87FA)?
No
Yes
Repair or replace handle.
Repair or replace fuse (F16) and/or
wiring. (See Te s t
12.)
To Next Page
Loading...
Need help?
General
