Service Manual

TRANSMISSION
Figure
57
14. Place the wheel pinion onto the output shaft. It is
symmetrical and can be put on either way.
15, Install the internally tabbed thrust washer onto
the output shaft making sure that the contours of
the tab follow the contours
of the keyway.
16. Slip the spring onto the end of the output shaft
and secure with the special retaining clip. Again,
make sure
that the center tab fits properly into
the keyway to prevent rotation of the clip.
See
Figure 58.
Figure 58
17. Slip the wheel, the original number of spacers,
and the wheel cover onto the shoulder bolt and
secure to the pivot arm using the nylon locknut.
18. Grease with a No. 2 type lithium-based grease.
As a rule, use
two pumps to insure that you do
not overgrease. Be sure to grease after every
25
hours of use to insure maximum service life.
Vacu-Power Mower
41
Transmission Operation
Power from the engine
is transferred to the wheels by
means
of a belt and a three speed transmission. The
belt and transmission are easiest to understand when
broken down into smaller systems.
Input System: Power is transferred from the engine to
the transmission via a belt. The self-propel pulley at
the engine is keyed to the crankshaft. The
self-propelled pulley on top
of the transmission is
supported by a ball bearing and drives a pinion gear
inside the transmission. Tensioning of the belt
is
accomplished by rocking the transmission. When the
operator squeezes
the control bar toward the handle,
a cable is tightened which tilts the transmission
backward and tensions the
belt. When the control bar
is released, gravity rocks the transmission forward to
loosen the belt.
Belt guides at the engine pulley and atop
the
transmission insure disengagement by forcing the belt
to loop around the pulleys. See Figure 59.
Figure
59
Speed Reduction System: Speed reduction is
accomplished by
two sets of gears--one set on the
intermediate shaft and the other set on the output
shaft. The gears on the intermediate shaft are
powdered metal and ride on a hexagonal shaft
supported on each end by
oil impregnated bushings.
These gears are driven by the pinion at the bottom of
the input shaft. The driven bevel gear turns the shaft
so that all three gears on the intermediate shaft have
the same rotational velocity. See Figure
60.
There are also three gears on the output shaft,
however, these three gears rotate freely on the gear
sleeve. The gear sleeve is coupled
to the output shaft
Self-Propel System