Hyundai 110D-9 Manual page 243

Trouble symptom
4.Unusual oil pressure
1) Oil pressure is high
2) Oil pressure is low
3) Transmission
5.Power is not transmitted
1) Torque converter
2) Transmission
Probable cause
Control valve malfunctioning.
Cold weather. (high oil viscosity)
Use of improper oil.
Gear pump malfunctioning(worn).
Oil leaks excessively :
(1)Control valve oil spring defective.
(2)Control valve spool defective.
Air sucked in.
Low oil level.
Oil filter clogging.
Oil leaks excessively.
Clutch plate damaged.
Low oil level.
Oil pump driving system faulty.
Shaft broken.
Lack of oil pressure.
Low oil level.
Inching valve and link lever improper-
ly positioned.
Forward/reverse spool and link lever
improperly positioned.
Clutch fails to disengage :
(1)Clutch case piston ring defective.
(2)Main shaft plug slipping out.
Clutch seizing.
Shaft broken off.
Clutch drum damaged (spring groove).
Clutch snap ring broken.
9-5
Remedy
(1)Check for spool operation.
If necessary, replace valve.
(2)Check for clogging of small hole in
valve body. If necessary, clean or
repair.
When atmospheric temp is below fr-
eezing point
(when normal oil pressure is recover-
ed if heated to 60 ~ 80˚C), change
oil.
Check and change oil.
Disassemble, check and replace.
Check spring tension (see spring sp-
ecification).
If necessary replace.
Disassemble, check, and repair or re-
place valve.
Check joints and pipes. If necessary,
retighten joint or replace packing.
Check oil level and add oil.
Check and replace.
Disassemble, check (piston ring and
O-ring for wear and other defects),
and replace.
Check for damage by listening to ab-
normal sounds at a low converter sp-
eed and replace.
Check oil level and add oil
Disassemble and check for wear of
pump gear, shaft and spline.
Replace defective parts.
Check and replace.
Check oil pump gear for wear and for
oil suction force.
If necessary, replace pump.
Check oil level and add oil.
Check measure and adjust.
Check and adjust.
Disassemble, check and replace
Disassemble, check and repair or re-
place
Check to see whether or not truck
moves even then transmission is in
neutral position. If so, replace.
Disassemble, check(main shaft, etc.),
and replace.
Disassemble, check and replace.
Disassemble, check and repair or re-
place.