Changing the Timing Belt
WARNING! Be sure to shut the engine off, remove
ignition key, disconnect the spark plug wire(s) to
prevent unintended starting before removing the
belt(s).
To replace the timing belt, proceed as follows:
Remove the deck from beneath the tractor (refer to Cutting
Deck Removal).
2.
Remove the hex screw, flat washer, lock washer, shoulder
spacer, and flange lock nut that make up the idler bracket
backstop. See Fig. 7-5.
NOTE: It may be necessary to clean the underside of the
mowing deck to access the hex screw. Refer to Fig. 7-5.
Applying force to either the timing belt idler pulley or the 4.
timing belt idler bracket, pivot and hold the idler bracket
against the spring tension just far enough to allow lifting
the timing belt off and above the idler pulley. Carefully
release the idler bracket. See Fig. 7-5.
Loop the timing belt and lift out of the timing pulley and 5.
over the right hand spindle assembly. Maneuver the belt
between the drive pulley on top of the spindle assembly
and the spindle cover to remove.
Repeat the above procedure to remove the belt from the 6.
left hand spindle assembly timing pulley. Refer to Fig. 7-5.
Loop the new timing belt and maneuver the belt between 7.
the drive pulley on top of the right hand spindle assembly
and the spindle cover. Lower the belt until loosely around
the right hand timing pulley. Refer to Figure 7-5.
8.
These timing arrows MUST be positioned 90° from each
other as shown in Fig. 7-6.
9.
timing arrow as shown in Fig. 7-6. Then without moving
timing pulley, above the timing belt idler pulley, and over
7-6.
While making sure not to change the position of either
After making sure the spring is hooked onto the idler
bracket and screw, pivot the timing idler bracket/idler
pulley against the spring tension just far enough to allow
you to lower the backside of the timing belt onto the idler
pulley. See Fig. 7-6.
Re-check the timing arrows on the two pulleys. If they have
moved from the 90º position when tensioning the timing
belt, pivot the idler pulley to relieve tension on the belt
and re-position the pulleys. The timing arrows MUST be
positioned 90° from each other as shown in Fig. 7-6.
Re-install the idler bracket backstop components as
originally installed in the deck housing, and position so
that there is a ⁄
bracket. Tighten the hex screw and flange lock nut to
secure in the adjusted position.
Bracket
Backstop
Idler Bracket &
Idler Pulley
Spring & Screw
Figure 7-5
Timing Pulley
Timing Arrow
Drive Pulley
Timing Arrow
Figure 7-6
26 se c t i O n 7— se r v i c e
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