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4.3 GROUND SPEED CONTROL ADJUSTMENT
4.3.1. IDLER SPRING TENSION ADJUSTMENT
Correct idler spring tension assures that mower will
achieve fastest attainable speed when ground speed
control lover is placed in ‘FAST’ position.
1. Remove rear cover from mower. Refer to Section
“Rear Cover Removal & Installation”.
2. Idler spring tension is adjusted properly when:
a. With lever in ‘SLOW’ position (see Figure 4.4), belt
is relaxed, and idler spring on end of ground speed
control cable has no extension. See Figure 4.6.
b. With lever in ‘FAST’ position (see Figure 4.4), belt is
tight, and idler spring on end of ground speed control
cable is extended approx. 1”. See Figure 4.7.
To adjust idler spring tension:
Loosen outer nut on end of ground speed cable, and
run inner nut in toward cable (clockwise) or out from
cable (counterclockwise) by 1/2 turn increments until
correct adjustments are attained. See Figure 4.6. Be
sure to tighten outer nut.
3. Replace rear cover.
4.3.2. MINIMUM GROUND SPEED ADJUSTMENT
If mower is traveling too fast or too slow when ground
speed control lever is placed in ‘SLOW’ position, mini-
mum ground speed can be adjusted. NOTE: Before
adjusting minimum ground speed, be sure idler spring
tension is adjusted correctly, as idler spring tension
may affect minimum ground speed. Refer to Section
“Idler Spring Tension Adjustment”.
1. Remove rear cover from mower. Refer to Section
“Rear Cover Removal & Installation”.
2. Place ground speed control lever in ‘SLOW’ posi-
tion. See Figure 4.4.
3. Adjust minimum ground speed:
To decrease minimum ground speed:
Remove end of idler spring from current adjustment
hole, and relocate spring one hole closer to idler arm
pivot bolt. See Figure 4.7a.
To increase minimum ground speed:
Remove end of idler spring from current adjustment
hole, and relocate spring one hole farther from idler
arm pivot bolt. See Figure 4.7a.
NOTE: After adjusting minimum ground speed, read-
justment of idler spring tension may be necessary.
4. Replace rear cover.
5. Check minimum ground speed; repeat adjustment
as necessary.
THE DRIVE BELT ON THIS UNIT IS SUBJECT TO
WEAR, AND SHOULD BE CHECKED REGULARLY.
REPLACE A WORN, FRAYED OR DAMAGED BELT
IMMEDIATELY.
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 spark plug. Engine and components are
HOT. Avoid serious burns, allow sufficient time for all
components to cool.
!
!
FIGURE 4.6
GROUND SPEED
LEVER IN ‘SLOW’
POSITION
BELT IS RELAXED
INNER NUT
SPRING HAS
NO TENSION
OUTER NUT
FIGURE 4.7
GROUND SPEED
LEVER IN ‘FAST’
POSITION
BELT IS TIGHT
SPRING LENGTH
EXTENDED 1”
UNEXTENDED
LENGTH
1”
FIGURE 4.7a
INCREASE MINIMUM
GROUND SPEED
ADJUSTMENT
HOLES
IDLER PIVOT BOLT
DECREASE MINIMUM
GROUND SPEED