Troy-Bilt 12069-7HP - Manual (Page 54)

1. Place Wheels/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 (Photo 5-27).
While holding the bolt steady,
loosen the jam nut (counterclock­
wise) until it touches the bolt head.
Adjusting Reverse Drive:
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
he 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 the jam nut
below it (see Photo 5-28). Hold
BOLD TINE MAINTENANCE
^ WARNING
To help avoid personal injury,
stop the engine, wait for all
moving parts to come to a
complete stop, remove the
electric start key, disconnect
the spark plug wire and move
the wire away from the spark
plug, and let the engine and
muffler cool before inspect­
ing, removing or replacing
the tines or tine holders.
Adjustment
Bolt
Jam Nut
Photo 5-28: Loosen jam nut before
turning reverse adjustment bolt.
the bolt steady while loosening the
jam nut three or four turns.
5. Move the Wheels/Tines/PTO
Drive Lever to NEUTRAL. The
switch body on the bottom of the
engine mount tab (see Photo 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 re­
verse adjustment bolt (turn it coun­
terclockwise).
6. Check that the reverse disc is at
least 3/16" away from the trans­
mission drive pulley. Then hold
the reverse adjustment bolt steady
with one wrench while tightening
the jam nut with a second wrench
(see Photo 5-28).
A. 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 condi­
tions. With use, the tines get
shorter, narrower and more pointed
(see Photo 5-30). If badly worn,
they lose the ability to till deeply.
Also, worn tines leave an ever-in-
creasing “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".
Tines can be replaced individually
or as a complete set. See replace­
ment instructions that follow.
7. Place a chalk or pencil mark on
the top edge of the plunger retain­
ing bolt. Now, while watching the
mark, loosen the bolt 3/4-tum (see
Photo 5-29). Do not exceed a 3/4
turn (this would disengage the bolt
from the locking groove in the side
of the plunger).
8. Hold the plunger retaining bolt
steady with a wrench while tight­
ening the jam nut against the side
of the plunger housing (Photo 5-27).
9. Check the action of the reverse
disc as explained previously.
Photo 5-29: Loosen plunger retain­
ing bolt about 3/4-turn, then tighten
jam nut against plunger housing.
IMPORTANT - If the above ad­
justments have not corrected an
improperly working reverse
drive, please contact our Tech­
nical Service Dept, for assistance.
Worn New
- i
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"1^
J III'
Photo 5-30:
Check for
tine wear
every 30
operating
hours.
Figure 5-31:
Replace
tines when
the gap be­
tween inner
tines is 5"
or more.
(Normal
gap is 3".)
54