Service Manual

Transmission Operation (cont’d)
with a roll
pin so the gear sleeve always rotates with
the output shaft. The gearselection system determines
which one of these three gears will be coupled with the
gear sleeve
and the output shaft. This determines the
final drive ratio. For more information on final speeds
at various throttle settings, see Figure 61.
Figure
60
Gear selection System: Gear selection is determined
by moving sliding shift keys
in a sleeve that is FIXED to
the output shaft. These keys engage one of the three
gears that rotate on the gear sleeve. Once the key
engages one of the gears, that GEAR will rotate
at the
same speed
as the output shaft. This determines the
final drive ratio, shown
in Figure 61.
Ground Speed Ground Speed
Gear @3000RPM @2000RPM
I
1
1.8 mph
2.5 rnph
3.8 mph
3
1.8 mph
2.7 mph
2
1.2 mph
Figure 61
The
shift keys are trapped on one end by the shift
collar. Movement
of the shift fork positions the shift
collar and shift key. The shift fork is supported, both
top and bottom, by nylon bushings for smooth
operation and long wear. See Figure 62.
The operator controls movement
of the shift fork by
means of the gear selection control and cable. For
more information on this,
see Gear Selection Control,
page
34.
NOTE: There are no detents in or on the transmission
on 1988 and 1989 Vacu-Power mowers.
General Information: The upper gear case half is cast
-aluminum. The lower transmission cover is made of
stamped steel
and the gears are powdered metal.
Figure
62
Output shaft and intermediate shaft construction is of
steel and both are supported by
oil impregnated
powdered metal bushings.
Lubrication is provided by 177 cc (6
oz) of No. 2 lithium-
based grease.
Transmission Removal
Complete transmission removal on the Vacu-Power
mower
is quite easy and is recommended for most
self-propel system repairs.
1. Remove the spark plug lead from the engine to
prevent accidental starting.
2. Place the ground speed selector in neutral. This
will make
it easier to remove the speed selection
cable later.
3. Remove the two flanged head self-tapping
screws securing the screen panel to the housing
and remove the panel. See Figure 63.
4. Remove the black plastic transmission cover
from the top rear
of the housing.
5. Remove the two flanged head self-tapping
screws securing the
belt cover to the top of the
transmission.
Pull the cable from belt guide and
remove the
belt guide.
Vacu-Power Mower
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