PROBLEM 8
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
Does diagnostic display TRACK screen (bank 7) display 1 when problem handle is moved in problem direction?
Yes No
Does engine load when moving problem handle in either direction?
Is travel brake switch in OFF position?
No
Yes
NoYes
Use test plug adapter. (See Test 9—Checking
Voltage at the Hydraulic Brake Valve.) 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 Test 12—
Checking Voltage at the Control Handle.)
No
Yes
Replace solenoid.
Is pressure at brake more than
21 bar (300 psi)?
No
Yes
Manually stroke pump (See Test 10—
Manually Stroking the Pump.) Does
pump pressurize?
Consult dealer/factory.
NoYes
Repair brake or gear box.
Is system charge pressure more
than 21 bar (300 psi)?
Replace brake valve.
Re-adjust charge pressure
relief or replace pump.
NoYes
Use test plug adapter. (See Te st
4—Testing the Pump EDC and
Motor PCP.) Is voltage present
at pump 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.
NoYes
Is 10 volts at handle (87FA)?
No
Yes
Repair or replace handle.
Repair or replace fuse (F16) and/or
wiring. (See Test 11—Testing for
Voltage at the Fuse Box.)
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