Wheel Drive Control Adjustment - Snapper S21, SP21, SPV21, SPV21S, SPV21E Safety Instructions & Operator's Manual

Section 4 - REPAIR & ADJUSTMENTS
WARNING
DO NOT attempt any maintenance, adjustments or
service with engine and blade running. STOP
engine and blade. Disconnect spark plug wire and
secure away from
components are HOT. Avoid serious burns, allow
sufficient time for all components to cool.

4.2 WHEEL DRIVE CONTROL ADJUSTMENT

The wheel drive control lever should engage the
transmission when the lever is squeezed back
against the handlebar,
transmission when the lever is released. See
Figure 4.4.
GROUND SPEED
CONTROL
FAST
SLOW
If the transmission does not fully engage or disengage,
adjustment may be performed as follows:
1. Remove rear cover from mower.
Section "Rear Cover Removal & Installation".
2. With wheel drive control lever in 'DISENGAGE'
position (see Figure 4.4), spring on end of wheel
drive control cable should have no tension.
Measure overall length of unextended spring. See
Figure 4.5.
TRANSMISSION
ENGAGE LEVER
(DISENGAGED)
MEASURE
UNEXTENDED SPRING
FIGURE 4.5
(Top of transmission; pulley removed for clarity)
spark plug. Engine
and disengage
WHEEL DRIVE
CONTROL
DISENGAGE
ENGAGE
FIGURE 4.4
Refer to
SPRING HAS NO
TENSION
3. Engage lever, and roll mower back and forth
several times to ensure clutch dogs are fully
engaged. With lever engaged, measure length of
extended spring. Overall spring length should
increase by 0.090 – 0.110" (3/32 – 7/64"). See
and
Figure 4.5a.
TRANSMISSION
ENGAGE LEVER
(ENGAGED)
the
EXTENDED SPRING – SHOULD BE LENGTH OF UNEXTENDED
SPRING PLUS 0.090 to 0.110" (3/32 to 7/64") EXTENSION
4. To adjust spring extension:
a. Disengage lever.
b. To increase extended spring length, loosen jam
nut,
turnbuckle, located on lower end of wheel drive
control cable, ½ turn out from turnbuckle. Tighten
jam nut. See Figure 4.5b.
c. To decrease extended spring length, loosen
jam nut, and rotate ferrule ½ turn in toward
turnbuckle. Tighten jam nut. See Figure 4.5b.
LOOSEN JAM NUT
ROTATE FERRULE
OUT TO INCREASE
SPRING LENGTH
CABLE
ROTATE FERRULE IN
TO DECREASE
SPRING LENGTH
5. Engage lever and recheck extended spring
length. Repeat step 4 as needed.
IMPORTANT:
CAUSE DAMAGE TO THE TRANSMISSION.
14
FIGURE 4.5a
and rotate ferrule
TURNBUCKLE
FIGURE 4.5b
INCORRECT ADJUSTMENT
below adjustment
FERRULE
CAN