Troy-Bilt 12090 Owner's Manual page 38

Section5: Maintenance
_ efore inspecting, cleaning or servicingthe machine, shut off engine, wait for all moving parts to come I
to a complete stop, disconnectspark plug wire and move wire away from spark plug. Remove ignition I
key, if so equipped.
Fa ure to fo ow these nstructons can resu t n ser ous persona njuryor propertydamage.
Replacing the Reverse Disc
Followthese steps to replace the reverse
disc. (If your tiller has a Bumper Attach-
ment mounted, it must be removed first.)
Removingthe ReverseDisc
1. Move Wheelsfrines/PTO Drive Lever in
NEUTRALposition.
2. Wedge a 5/16"-thick board between top
of engine pulley (avoidcontacting reverse
disc) and cast iron housing next to it.
This immobilizes pulley.
3. Use a 9/16" wrench to loosen the
mounting bolt shown in Figure5-23.
Rememberto immobilize the pulley with
the wood wedge while loosening the bolt.
If necessary,pry the disc from the pulley
with the tip of a screwdriver. Back the
bolt out as far as possible. Then angle
the disc a little to remove it. Bring the
bolt and Iockwasher along with the disc.
and engine mount move down to press
on the reverse adjustment bolt (Figure 5-
24). This action compresses the reverse
spring and plunger assembly, requiring
you to hold the lever up in REVERSE.
Whenyou releasethe lever, the spring
automatically pushes the lever back into
NEUTRALposition.
The spring and plunger assembly is
designedto prevent the reverse disc from
making contact with the transmission
pulley until you shift into REVERSE.
Whenthe lever is in NEUTRAL,the switch
body on the bottom of the engine mount
tab should be resting squarely on top of
the reverse adjustment bolt (Figure 5-24).
The reverse adjustment bolt can be
adjusted up or down to correct a number
of reverse drive operating problems, as
explainednext.
Figure 5-24: Spring and plunger
assembly.
ment bolt should be adjusted upward (see
instructions thatfollow). Moving adjust-
ment bolt upward will also solve problem
of a tiller that goes into REVERSE on its
own.
Figure 5.25: Checking Reverse
Disc in NEUTRAL.
3. Use your left hand to hold
Wheels/Tines/PTODrive Lever up in
REVERSE, w hile briefly pulling out engine
start rope. The reverse disc should turn
lower pulley (see Figure 5-26). If not, or
it requires a lot of pressure to hold lever
up in REVERSE, t hen reverse adjustment
bolt must be adjusted downward. When
correctly adjusted, the Wheels/Tines/PTO
Drive Lever should pop out of reverse
when the lever is released, but not require
exceptional effort to hold it up in reverse
position.
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Figure 5-23: Removing Reverse Disc.
InstallingaNewReverseDise
1. Do steps 1-through-3, described previ-
ously, in reverse.
2. Tighten mounting bolt securely, and
check for correct operation -- see
Checkingand Adjusting ReverseDrive
System.
Checking and Adjusting
Reverse the Drive System
Whenthe Wheels/Tines/PTO Drive Lever
is moved up into REVERSE, t he engine
CheckingandAdjustingReverse Disc
1. Verify that linkagesfor
Wheels/Tines/PTODrive Lever are lubri-
cated with oil and engine mount bars and
belt adjustment block are lubricated with
grease. (See Tiller Lubrication in this
section.)
2. PlaceWheels/Tines/PTODrive Lever in
NEUTRAL. Briefly pull out engine recoil
start rope while watching reverse disc.
The disc should turn, but lower pulley
should not (Figure5-25). If reverse disc
turns lower pulley, or if it is located closer
than 3/16" to the pulley, reverse adjust-
Figure 5-26: Checking Reverse Disc
in REVERSE.
4. Shift the Wheels/Tines/PTODrive Lever
to REVERSE and then let it go. The lever
should return to NEUTRAL. If not, the
reverse adjustment bolt will have to be
adjusted upward.