Snapper 21500PRC - Page 7

1
j' *#!;
1/8" - 1/4"-
IN HIGHEST
SPEED SETTING
DRIVE
DISC
CONNECTOR
NUT
FIGURE 8 - DRIVEN DISC ADJUSTAAENT
FIGURE
DETACHING TRANSFER ROD
DRIVEN DISC REPLACEMENT: If the rubber of driven disc is badly chunked or worn down to within 1/16" of the
rnetal rim, remove the driven disc assembly and replace the driven disc as follows: Remove the clip and detach
the trpnsfer rod from the speed control lever (Figure 9). Using a pair of needle nose pliers, unhook the drive spring
slide the driven disc assembly off as shown in Figures 10 and 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.
BELT SERVICE - - -- -^ ;
Slippage of worn b^lts will cause self-propelled models to pull poorly. On these models 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.
Replace faulty belt, as follows:
ENGINE BELT REPLACEMENT: Since it will be necessary to work on the underside of the cutting deck to replace the
engine belt, disconnect the spark plug boot from the plug 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 disc assembly as described under DRIVEN DISC service. Tilt the mower up on its right wheels and
remove the cutting blade and hub, then remove the drive disc retaining nut and internal tooth lockwasher. Lift the
drive disc-idler assembly off the deck and remove the faulty belt. Loop one end of the replacement belt over the en¬
gine drive pulley and insert the belt through the deck opening. Loop the belt around the drive disc pulley and push
the drive disc-idler assembly down into position on the deck. Install the internal tooth lockwasher and disc retaining
nut on the drive disc stud and securely tighten these. Test to make sure the idler arm is free to pivot without interfer¬
ence then reinstall the cutting blade components (refer to BLADE SERVICE), driven disc assembly, then using a stiff
wire (Hint: coat hanger) with hooked end, pull the hooked end of the idler arm spring through the larger hole in
the right wheel bracket and hook the end through the smaller hole.
I PdLY V-BELT REPLACEMENT: This belt can be replaced after pulling the driven disc assembly as described earlier Note
the arrangement of old belt around pulleys before cutting and removing it. Slip the replacement belt oyer the end of
hex shaft pulley and work over idler pulley. Twist the belt sideways and pull It upward between the differential
M . transmission pulley. Slip belt over grooves in the hex shaft, clutch idler and transmission pulleys.
Note: When properly installed, the lower span of the Poly V-Belt will be above the belt guide.
I {Continued on Page 8)
FIGURE 10 - UNHOOKING DRIVE SPRING
I FIGURE 11 - REMOVING DRIVEN DISC ASSEMBLY