Service Manual
C.
d.
e.
f.
g.
h.
1.
Externally Tabbed Thrust Washer fits
in
corresponding recesses on the pivot arm to
protect pivot arm from premature wear.
Internally Tabbed Thrust Washer internal tab
fits
in
the keyway on the output shaft. This washer
rotates with the output shaft and protects
outboard clutch components from wear.
Special Retaining Clip
fits
in
a
groove on the
output shaft to retain the pivot arm and spring
arm. (This is not an E-clip!) The tab at the center
of the clip is extended and
fits
in the keyway of
the output shaft to prevent rotation. If an E-clip is
substituted, premature failure of
the
wheel pinion
clutch system will result.
Friction
Ring
fits
in
a circular groove
in
the pivot
arm and works with the clutch washer to actuate
the key.
It
does not rotate.
Clutch Washer is affixed to the output shaft by
means of the key
so
it
turns with the output shaft.
It
is also allowed to rotate slightly with respect to
the output shaft. This slight back and forth
rotation actuates the wheel pinion key. Friction
between the clutch washer and friction ring
causes the clutch washer to lag the output shaft
slightly once
it
is engaged. That slight rotation is
all that is necessary to raise the wheel pinion key
and engage the pinion.
Wheel Pinion Key causes wheel pinion to turn
with output shaft when up. Allows the wheel
pinion to “free-wheel” when down. Clutch washer
brings key up. Wheel pinion turning forward
'wipes' key down.
Wheel Pinion positively engages the wheel gear
at all times. Engagement with the output shaft is
controlled by the wheel pinion key. The wheel
pinion is a powered metal part and is symmetrical
so
that
it
can be
put
on either way and
still
function properly.
Internally Tabbed Thrust Washer -turns with the
output shaft to prevent wear problems between
the spring and the wheel pinion.
Compression Spring provides the light,
constant, inward force necessary for proper
clutch washer and friction ring engagement.
Special Retaining Clip
fits
in
the outer groove
on the output shaft to retain the outer wheel
pinion clutch components (note that this is not
an E-clip!). The extended tab at the center of the
clip
fits
into the keyway to prevent rotation with
respect to the output shaft. Substituting an Eclip
will result
in
reduced wheel pinion clutch life.
The wheel pinion clutch is a durable system, however
it
is extremely important that
it
be
maintained
as
per
the instructions
in
the operator's manual, which is
greasing every
25
hours with one
or
two
pumps of
grease, Greasing regularly will prevent contaminants
from damaging
or
wearing the system.
Rear
HOC and WPC
Disassembly
The rear height-of-cut system and the wheel pinion
clutch can be serviced with the transmission
in
or
out
of the unit.
For
information on removing the
transmission from the unit, see Transmission
Removal, page
42.
I.
Disconnect the spark plug lead from the spark
plug to prevent accidental starting.
2.
Remove the shoulder bolt securing the wheel
and tire assembly to the pivot arm and remove
the wheel and tire assembly complete with
shoulder bolt, spacers, wheel cover and nylon
locknut.
3.
Remove the special retaining clip at the end of
the output shaft and pull
off
the following
six
wheel pinion clutch components:
Spring
Internally Tabbed Thrust Washer
Wheel Pinion
Wheel Pinion Key
Clutch Washer
Friction
Ring
4.
Remove the inner special retaining clip from the
output shaft and remove the following
components:
Internally Tabbed Thrust Washer
Externally Tabbed Thrust Washer
Pivot Arm and Spring Arm Assembly
End Cap
(if
desired)
5.
Check all components at this time for damage
and wear. Pay particular attention to the grooves
at the end of the output shaft, the bearing
surfaces on the output shaft and the wheel pinion
clutch components. Replace parts as necessary.
6.
Check the innermost groove on the output shaft
which is located
5.7
cm
(2-1/4”)
in
from the end
of the shaft) making sure that the O-ring seal is
present and
in
tact. This seal is important to keep
grease
in
and contaminants out. Replace
if
necessary. See Figure
55.
Vacu-Power
Mower
39
Self-Propel System