TYM T233 HST, Руководство по обслуживанию

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SECTION 5. TROUBLESHOOTING
Problems and probable causes Counter measures
1. Steering wheel is very heavy to turn
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
-Replace column spline
-Check column assembly face and spline
length (MAX 6.5
㎜
)
-Replenish oil or Exchange
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
-Exchange pump
-Replenish oil
-Adjust relief pressure
3)Trouble internal steering unit valve
(1)Low setting pressure of relief valve
(2)Ball-nut heavy to work
-Adjust fluid level properly
-Wash clean or replace
4)Trouble machine mechanism.
(1)Poor link work -Wash and replenish oil (1)Poor link work
(2)Excessive sector gear pre-load
-Wash and replenish oil
-Adjust backlash
2. Return to neutral is too slow
1)Poor assemble steering column and unit
(1)Poor assemble to center between
column and unit
(2)Column assembly face depressed unit
bushing
-Loosen the bolt and fix again with center
-Replace column or repair
2)Depressed control set (spool+sleeve)
(1)Excessive fluid volume
(2)Excessive pressure
(3)Dust
-Adjust fluid level properly
-Adjust pressure
-Wash
3) High pressure ratio of "T" port (tank port)
(1) Tank port hall is small
(2) Tank port pipe is linked to other lines
-MAX. Pressure ratio 20 bar
-Wash and clean pipe line
-Separate unit pipe line and reinstall
8-12