Troy-Bilt 12087 Owner's/Operator's Manual page 54

~aintenance/Rep_a_ir_s~~~~~~~~~~~~~~~
Adjusting Reverse Drive:
1. Place Wheelsrrines/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.
Photo 5-27: Hold bolt steady while
loosening or tightening jam nut.
3. Tum 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 the jam nut
below it (see Photo 5-28). Hold
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 Wheelsrrines/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 (tum 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).
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-turn (see
Photo 5-29). Do not exceed a 3/4
tum (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 314-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.
Photo 5-30:
Check for
tine wear
every 30
operating
hours.
Figure 5-31 :
Replace
tines when
the gap be-
tween inner
L -JbE~~~~~~
tines is 5"
or more.
(Normal
gap is 3".)
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.
BOLO 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.
54