Hyundai HL955 Manual page 139

Problem
Machine will not move
Machine does not
engage in low gear
Cause
Low oil level.
Applied park brake.
No power to transmission contro-
ller.
Malfunctioning parking brake
solenoid valve.
Restricted orifice of PPC valve.
Excessive leakage in
transmission element.
Worn clutch disks.
Low or no transmission
pressure.
Service brake will not release.
Failed torque converter.
Broken shafts or gears.
Broken drive shafts.
Broken ring or pinion gear.
Malfunctioning transmission
control solenoid valve.
Stuck spool in transmission
control valve.
Stuck PPC valve.
Malfunctioning transmission
speed sensor.
3-83
Remedy
Add oil.
Check parking brake fuse.
Check continuity to parking brake switch.
Check transmission controller fuse.
Remove and inspect parking brake solenoid
valve.
Check for power to solenoid valve.
Remove orifice and check for contamination
and/or plugging.
(Do not remove valve housing for this purpose.)
Do transmission element leakage test using
system pressure.
Repair transmission.
See transmission pressure is low in this group.
Do brake pedal operational check.
Do service and park system drag checks.
Do torque converter stall test.
If engine pulldown in normal, torque converter is
good.
Drain transmission to determine if large pieces
of metal contamination are present.
Inspect drive shafts and universal joints for
external damage. Repair.
If drive shaft rotate with transmission in gear but
machine does not move, a differential failure is
indicated. Repair.
Check solenoid valve.
Remove and inspect transmission control valve
spools.
Remove end cover to inspect PPC valve.
Replace if necessary.
Check speed sensor.