Yanmar YM155d Service Manual page 98

Column
bush
Ball
ioint
Oust
cover
- 7
(1) Specifications
Unit: inch (mm)
I
I
Gear ratio
1
18.9:l
1
15.4:1
I
I t e m
Tractor model
T V P ~
I
No. of teeth of sector aear o n full circle basis
I
15
I
13
I
Specifications
Angle o f motion o f center shaft
YM155, YM155D
I
Direction o f twist o f the w o r m aear
I
Left
I
I
e f t
1
YM735, YM135D
2 x 430
degrees
-
~~ ~ I
. .
I
.
-
-
I
-~
.
I
.
Gear o i l
I
SAE
#SO
or eauivalent
2 x 410
degrees
Sector gear module
Worm lead
Ball-screw
0.344 (8.731 1
0.313 1 7 . 9 3 8 1
(2) Inspection and Maintenance
By turning the screw t o the right, the amount of
The steering gear box i s capable of withstanding
play can be reduced. (The standard position fSr
heavy use, and there
is
rarely any need t o dis-
the screw is a quarter-turn back from the point
assemble it for maintenance work.
at which the screw suddenly becomes hard t o
turn.)
Ball-screw
3 . 5
Oil capacity
Outer diameter o f steering wheel
Steering wheel play
Backlash adjustment can be done by varying the
-
number of adjusting shims fitted on the side of
the gear box.
NOTES:
(1) Check wherher the drag rod is bent.
Steering play adjustment can be done by adjust-
ing the backlash of the gears.
(2)
Check whether rhe ball joints function smoothly.
3
0.05
US gals
(0.2 1)
15.75 (400)
1.17-2.0 (30-50) m)
0.05
US gals
(0.2 1 )
14.96 (380)
1 . 1 7 - 2 . 0 (30-50)