Driven Disc Service; Belt Service - Snapper 21351 Manual

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INNER
SPRING
FIG 8 - cLuTcH LINKAGE ADJUSTMENT
1/8"- 1/4
IN HIGHEST
SPEED SETTING
DRIVE
DISC
CO N N ECTO R
NUT
i ll|
FIG 9 - DRIVEN DISC COMPONENTS
FIG 10 - UNHOOKING DRIVE SPRING
-6-
CLUTCH LIN KAG E (Self-Propelled)
Make sure the vinylcover remains over the spring(s) con-
necting the clutch pull rod to the clutch idler components
(see Figure 8). This not only keeps the spring clean but
prevents it from rubbing against and wearing a hole in the
grass bag on mowers so equipped.
ADJUSTMENTS: If excessive pressure is required to hold
the wheel drive clutch lever in the engaged or drive posi.
tion, the clutch pull rod springs are probably out of adjust-
ment. This is checked with the engine stopped and the
clutch handle released. When properly adjusted there
should be 1/16" to 1/8" clearance between the inside hook
of the spring and inside eye of the push rod as shown in
Figure 8. To adjust, unhook and rotate the inner and outer
springs in opposite direction, rehook and check clearance.
Repeat this procedure until the clearance is correct. If the
wheel drive control does not snap back to disengage the
drive when the handle is released, check the clip holding
the pull rod to the handle bar for binding. Position this clip
about 5" from the upper handle and rotate to best position
to allow the rod to slide without interference.
DRIVEN DISC SERVICE
If the mower does not pull properly with the wheel drive
clutch engaged, check for the following: Grease on drive
disc causing slippage, broken or disconnected driven
assembly spring (see Figure 10), driven disc too worn to
contact the drive disc properly, driven disc out
rof
adjust-
merit. This condition could also be caused byworn belts. If
the belts are in good condition and the clutch is properly
adjusted, service the drive system as follows:
DRIVEN DISC ADJUSTMENT: With the engine stopped and
the speed lever shifted into highest speed setting, the
driven disc should be 1/8" to 1/4" from the center of the
drive disc as illustrated in Figure 9. Readjust with engine
stopped as follows: Shift the speed selector into the
highest speed setting, loosen the connector hex nut and
slide the driven disc assembly inward or outward until the
center is 1/8" to 1/4" from the edge of the drive disc.
Retighten connector nut to lock at new setting.
DRIVEN DISC REPLACEMENT: If the rubber of driven disc
is badly chunked or worn down to within 1/16" of the metal
rim, remove the driven, disc assembly and replace the
driven disc as follows: Remove the clip and detach the
transfer rod from the speed control lever (Figure 10), Using
a pair of needle nose pliers, unhook the drive spring and
slide the driven disc assembly off as shown in Figure 11 .
Remove the five machine screws securing the rubber
driven disc and separate the worn disc from the hub.
Reverse this procedure to install the replacement disc and
to reconnect the drive components.
BEARING REPLACEMENT: If the bearing fails, remove the
driven disc assembly as described above and replace the
bearing as follows: Remove the snap ring using special
snap ring pliers. Slide the driven ring, hub and bushing out
of the bearing. Remove the four screws and bearing.
Reverse this procedure to install the replacement bearing
and reconnect the drive components.
BELT SERVICE
Slippage of worn belts will cause self-propelled models to
pull poorly. On these the engine belt transmits this power
to the poly-V-belt which, in turn, engages the clutch to
drive the transmission and rear drive wheels.
ENGINE BELT REPLACEMENT: Disconnect the spark plug
wire and empty the fuel tank or tape the vents in the filler
cap to prevent fuel spillage then proceed as follows:
Unhook the idler arm spring from the right rear wheel
bracket and remove the driven dic assembly as described
under DRIVEN DISC service. Tilt the mower up on its right
wheels and removethe cutting blade and hub, then remove
the drive disc retaining nut and internal tooth Iockwasher.
Lift the drive disc-idler assembly off the deck and remove
faulty belt. Loop end of replacement belt over engine drive