Paccar CARCO 50B, Service Manual

Page: 27 / 61

25
TROUBLE
PROBABLE CAUSE CORRECTIVE ACTION
J
FREESPOOL will not engage
or disengage. 1. Control system malfunction.
2. Problem with freespool cylinder
assembly or pressure supply hose.
3. Freespool shift rail out of adjust-
ment.
4. Winch load is applied to gear
train, preventing shift by freespool
cylinder.
5. Freespool solenoid not energizing
or defective.
1. Perform electronic and hydraulic tests.
2. Inspect the freespool cylinder assembly
components and hose. Repair or replace
as required.
3. Adjust the position of the shift rail. Refer
to the "Idler Shaft Group" section of this
manual.
4. Conduct operator training. Instruct oper-
ator to release load with BRAKE-OFF
function BEFORE attempting FREE-
SPOOL.
5. Test electronic circuits and/or repair or
replace solenoid valve.
K
Winch will not REEL-IN or
REEL-OUT. All other func-
tions appear normal.
1. If engine speed is not "pulled
down" when applying either clutch,
then C2 (REEL-IN) or C1 (REEL-
OUT) clutch solenoid valve is not
receiving 24 VDC, or the solenoid
valve is stuck.
1a. Check the blue, brown and white w/
black stripe wires for 24 VDC. Replace
solenoid(s) or correct electronic control
system as required. Check the resistance
of the coil(s). If the resistance across the
terminals of the coil(s), with the wires
removed, is less than 25 Ohms at 70°F
(2°C), then the coil is defective.
Resistance will decrease at higher temper-
atures. If in doubt, remove the clutch pres-
sure hose from port "C2" and install a pres-
sure gauge. Start the tractor and place the
winch control lever in the REEL-IN posi-
tion. If the solenoid opens, pressure
should be 400 PSI (2760 kPa). A quick
check of the wiring AND solenoid may be
made by testing the magnetism of the
energized coil with a small screwdriver,
placed near the top of the solenoid.
1b. If engine speed "pulls down" when
winch operation is attempted, then C1
clutch solenoid is applying the REEL-IN
clutch but the brake is not releasing.
Check the wires as mentioned in correc-
tive action K1. Check the brake control
solenoid valve (item 2) for actuation and
replace as required.
L
No response to movement of
joystick.
1. Power is "ON" at pin 1.
2. Power is "OFF" at pin 1.
1. Operator MUST press enable button.
Electronic problem - joystick, control mod-
ule, harness. Mechanical problem - loose
filter, bad pump, stuck solenoid valve car-
tridge(s).
2. Electrical problem - blown fuse, open
circuit in harness.