Troy-Bilt 12090 - Manual (Page 39)

Sections: Maintenance
A
WARNING
n'
Before inspecting, cleaning or servicing the machine, shut off engine, wait for all moving parts to come
to a complete stop, disconnect spark plug wire and move wire away from spark plug. Remove ignition
key, if so equipped.
Failure to follow these instructions can result in serious personal injury or property damage.
Adjusting Reverse Drive:
1. Place Wheeis/Tines/PTO Drive Lever in
FORWARD position.
2. On left side of tiller, put a 1/2" wrench
on the plunger retaining bolt and another
1/2" wrench on the Jam nut next to it
(Figure 5-27). While holding the bolt
steady, loosen the Jam nut (counterclock­
wise) until it touches the bolt head.
. Jam Nut
I Retaining I
tr .. ....
7. Place a chalk or pencil mark on the top
edge of the plunger retaining bolt. Now,
while watching the mark, loosen the bolt
3/4-turn (Figure 5-29). Do not exceed a
3/4 turn (this would disengage the bolt
from the locking groove in the side of the
plunger).
i,; ^ W
. Adjustment
Bolt ‘ ^
* ■
Jam Nut
Figure 5-27: Hold bolt steady while
loosening or tightening jam nut
3. Turn the bolt in until it tightens against
the plunger inside the spring. The bolt
must be tight to prevent plunger from
turning - but be careful not to overtighten
and break the bolt.
4. Place a 7/8" wrench on the head of the
reverse adjustment bolt and a 9/16"
wrench on thejam nut below it (Figure 5­
28). Hold the bolt steady while loosening
thejam nut three or four turns.
5. Move the Whee!s/Tines/PTO Drive
Lever to NEUTRAL. The switch body on
the bottom of the engine mount tab
(Figure 5-24) should be resting squarely
on top of the reverse adjustment bolt, and
the reverse disc should be at least 3/16"
away from the transmission drive pulley.
If the reverse disc is any closer than this,
raise the reverse adjustment bolt (turn it
counterclockwise).
6. Check that reverse disc is at least 3/16"
away from transmission drive pulley.
Then hold reverse adjustment bolt steady
with one wrench while tightening Jam nut
with a second wrench (Figure 5-28).
Figure 5-28: Loosen Jam nut before
turning reverse adjustment bolt
8. Hold the plunger retaining bolt steady
with a wrench while tightening thejam
nut against the side of the plunger housing
(Figure 5-27).
i PJ
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, ► -a
Bolo Tine Maintenance
Checking Tines for Wear
Inspect the tines for wear or damage after
every 30 operating hours. The rate of
wear depends upon hours of use and soil
conditions. With use, the tines get
shorter, narrower and more pointed
(Figure 5-30). If badly worn, they lose the
ability to till deeply.
Figure 5-30: Check for wear
every 30 operating hours.
Worn tines leave an ever-increasing gap
in the middle of a tilled row. The normal
gap is 3" between the tine tips - replace
the tines when the gap widens to 5"
(Figure 5-31).
Figure 5-29: Loosen plunger
retaining bolt about 314-turn, then
dghten jam nut against plunger
housing.
9. Check the action of the reverse disc as
explained previously.
IMPORTANT: If the above adjustments
have not corrected an improperly working
reverse drive, contact an authorized
dealer or Factory Technical Service
Department for assistance.
Figure 5-31: Replace tines when gap
between inner Ones is 5" or more
(normal gap is 3").
Tines can be replaced individually or as a
complete set. See replacement instruc­
tions that follow.
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