PROBLEM 7
Crawler track(s) will not travel in either direction.
POSSIBLE CAUSES
Damaged brake valve; Worn control handle; Damaged EDC; No voltage from handle to controller; No
voltage to pump EDC; Node controller fault; Low brake pressure; Wiring or switch is damaged; Pump,
motor, or gearbox is worn.
CHECKS
On travel Diagnostic screen is brake disengaged when handle is moved in problem direction?
On travel Diagnostic screen is there a problem with pump, brake, or motor?
Yes No
Engine loads when moving problem handle in either direction?
Is travel brake switch in off position?
No
Yes
No
Yes
Is 24 volts present at hydraulic brake solenoid 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 travel Diagnostic screen show
100% handle command in reverse or forward
direction?
NoYes
Replace switch
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 travel Diagnostic show 100% pump control
in each direction?
NoYes
Is voltage at problem handle greater
than 0 with handle moved? (See
Section 3 - Diagnostic Screen.)
No
Yes
Replace solenoid.
Is pressure at brake more than
300 psi (21 bar)?
No
Yes
Manually stroke pump. Does pump pressurize?
Consult dealer/factory.
No
Yes
Repair brake or gear box.
Is system pressure more than 300
psi (21 bar)?
Replace brake valve.
Re-adjust charge pressure relief
or replace charge pump.
NoYes
Is voltage present at pump EDC?
(See Section 3 - Checking Electrical
Inputs/Outputs.)
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.
NoYes
Replace handle.
Consult dealer/factory.
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