TYM T390 Service Manual

SECTION 5. TROUBLESHOOTING
Counter measuresProblems and probable causes
1. Steering wheel is very heavy to turn
-Wash and replenish oil
-Adjust backlash
4)Trouble machine mechanism.
(1)Poor link work
(2)Excessive sector gear pre-load
-Adjust fluid level properly
-Wash clean or replace
3)Trouble internal steering unit valve
(1)Low setting pressure of relief valve
(2)Ball-nut heavy to work
-Exchange pump
-Replenish oil
-Adjust relief pressure
2) Insufficient pump pressure or fluid volume
(1)Check pump delivery
(Unit volume×120 rpm×1.15)
(2)Check oil tank fluid volume
(3)Check pump pressure
-Replace column spline
-Check column assembly face and spline
length (MAX 6.5㎜)
-Replenish oil or Exchange
1) Poor assemble between steering column and
unit.
(1)Spline of column and unit are assembled
tightly.
(2)Spool of unit is seized by spline of column
.
(3)Poor rotation of column
2. Return to neutral is too slow
-MAX. Pressure ratio 20 bar
-Wash and clean pipe line
-Separate unit pipe line and reinstall
3) High pressure ratio of "T" port (tank port)
(1) Tank port hall is small
(2) Tank port pipe is linked to other lines
-Adjust fluid level properly
-Adjust pressure
-Wash
2)Depressed control set (spool+sleeve)
(1)Excessive fluid volume
(2)Excessive pressure
(3)Dust
-Loosen the bolt and fix again with center
-Replace column or repair
1)Poor assemble steering column and unit
(1)Poor assemble to center between
column and unit
(2)Column assembly face depressed unit
bushing
8-13

TYM T390 Specifications

General

Brand	TYM
Model	T390
Category	Tractor
Language	English