Hyundai 110D-9 Manual page 242

Trouble symptom
3.Low output power
1) Torque converter
2) Transmission
Probable cause
Insufficient hydraulic pressure :
Low oil level.
Air sucked in.
Oil filter clogging.
Oil pump worn.
(Low delivery flow)
Regulator valve coil spring fatigu-
ed.
Control valve spool malfunctioning.
Piston or O-ring worn.
Stator free wheel cam damaged.
Flexile plate deformed
Stator free wheel seizing.
Impeller damaged for interfering with
the surroundings.
Use of poor quality of oil or arising of
air bubbles.
Air sucked in from inlet side.
Low torque converter oil pressure
accelerates generation of air beb-
bles.
Oil mixing with water.
Inching rod out of adjustment.
Clutch slipping
Lowering of weight.
Piston ring or O-ring worn.
Clutch piston damaged.
Clutch plate seizing or dragging.
9-4
Remedy
Check oil level and add oil
Check joints and pipes.
If necessary, retighten joint or repla-
ce packing.
Check and replace
Check oil pressure. If necessary rep-
lace pump.
Check spring tension. If necessary,
replace.
Disassemble, check and repair or re-
place.
Disassemble, check measure and re-
place.
Check stalling speed.
(Increased engine load will cause ex-
cessive drop of stalling speed.)
Check oil temperature rise.
If any, replace free wheel.
Replace flexible plate
Check temperature plate.
(No-load will cause temperature rise)
Replace free wheel if a drop of start-
ing output is found.
Check drained oil for foreign matter.
If any, change oil.
Check and change oil.
Check joints and pipes.
If necessary, retighten joint or replace
packing.
Check oil pressure.
Check drained oil and change oil.
Check and adjust.
Check oil pressure.
Disassemble, check, measure and
replace.
Disassemble, check and replace.
Check to see whether or not truck
moves even when transmission is in
neutral position. If so, replace.