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Yanmar YM155 - Page 151

Yanmar YM155
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Gears cannot be
engaged or are hard
to engage; two
speeds are engaged
together; or tend to
fall out of gear.
5.
TRANSMISSION AND RELATED ITEMS
A
Trouble
3.
Gears damaged:
Assembled incorrectly. Reassemble.
1.
Operator shifting too quickly, or
attempting to shift when tractor is
still
in
motion.
Clutch pedal is not depressed fully.
2.
Shifter worn, deformed, or damaged.
Deviation in stroke of sliding gear
'
Readjust.
(too much or not enough)
Probable cause
Operator orientation
Replace.
Remedv
I
-
/
Poor quality oil.
/
Change oil type
4.
Clutch adjusted incorrectly.
I
1
2.
Shaft deformed, splines worn.
I
Replace
Adjust
3.
Gears damaged. Replace
Backlash of gears incorrect. Adjust
.I
Stranqe noises.
I
1.
Oil insufficient.
/
~dd oil.
Gears adjusted incorrectly (relative
positions of drive pinion and ring
gear).
/
not function.
/
and return.
I
'
4.
Fork damaged or bent. Replace.
P.T.O. AND RELATED ITEMS
/
Differential does
/
1.
Differential clutch does not slide
I
Adiust.
Differential
lack does
not function.
2.
Differential lock spring damaged.
1.
Differential lock cam damaged.
Replace.
Replace.
Trouble
.A
Probable cause
1.
Tractor has not come to a full stop.
2.
Clutch pedal
IS
not fully depressed.
3.
Clutch pedal not adjusted correctly.
4.
Operator shifts too soon.
5.
Gears assembled incorrectly.
6.
Shifter fork worn or deformed.
1.
Oil insufficient
2.
Gear has excessive backlash.
3.
Shaft spline section worn or deformed.
4.
Fork deformed.
1.
2.
Remedy
Driver orientation.
Driver orientation.
Adjust.
Driver orientation.
Reassemble.
Replace.
Add oil.
Adjust.
Replace.
Replace.
Gears cannot be
engaged; tend to
to engage; engage
double.
Strange noises.

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