Sears 917.250551 Lawn Mower User Manual


 
SERVICE AND ADJUSTMENTS
ROTOR CLUTCH PLATE
TO REPLACE MOWER BLADE DRIVE BELT
(See Fig. 23)
Park the tractor on level surface, Engage parking brake
Remove mowerdrive belt (See'q-O REPLACE MOWER
DRIVE BELT" in this section of this manual).
Remove mower (See "TO REMOVE MOWER" in this
section of this manual),
o Remove four screws from R.H, mandrel cover and
remove cover, Unhook spring from bolt on mower
housing
o Carefully roll belt off RH mandrel pulley.
Remove belt from center mandrel pulley, idler pulley,
and LH mandrel pulley,
Remove any dirt or grass which may have accumu-
lated around mandrels and entire upper deck surface.
Check secondary idler arm and idler to see that they
rotate freely
Be sure spdng is hooked in secondary idler arm and
sway-bar bracket,
Install new belt in lower groove of L H mandrel pulley,
idler pulley, and center mandrel pulley as shown.
Roll belt over R, H, mandrel pulley Make sure belt is in
all grooves properly,
Reconnect spring to bolt in mower housing and rein-
stall R,H, mandrel cover_
Reinstall mower tetractor(See "TO INSTALL MOWER"
in the Assembly section of this manual)
Reassemble mower drive belt (See "TO REPLACE
MOWER DRIVE BELT" in this section of this manual
MOWER BLADE
DRIVE BELT CENTER
MANDREL
MANDREL
COVER
SPRING
SWAY-BAR
BRACKET
IDLER '_
FIG, 23
TO ADJUST ATTACHMENT CLUTCH
(See Fig. 24)
The electric clutch should provide years of service The
clutch has a built-in brake that stops the pulley within 5
seconds_ Eventually, the internal brake will wear which
may cause the mower blades to not engage, or, to not stop
as required Adjustments should be made by your nearest
authorized service center/department
Make sure attachment clutch and ignition switches are
in "OFF" position.
o Adjust the three nylon Iocknuts until space between
clutch plate and rotor measures 012" at all three slot
locations cut in the inside of brake plate
NOTE: After installing a new electric clutch, run tractor at
full throttle and engage and disengage electric clutch 10
cycles to wear in clutch plate
NYLON LOCKNUT (3)
FIG. 24
BRAKE PLATE
TO ADJUST BRAKE (See Fig. 25)
Your tractor is equipped with an adjustable brake system
which is mounted on the left side of the transaxle
If tractor requires more than six (6) feet stopping distance
at high speed in highest gear. then brake must be adjuste&
Depress clutch/brake pedal and engage parking brake
° Measure distance between brake operating arm and
nut "A" on brake rod,
If distance is other than 1-3/4", loosen jam nut and turn
nut "A" until distance becomes 1-3/4" Retighten jam
nut against nut "A"
Road test tractor for proper stopping distance as stated
above, Readjust if necessary. If stopping distance is
still greater than six (6) feet in highest gear, further
maintenance is necessary Contact your nearest au-
thorized service center/departmenL
WITH PARKING BRAKE "ENGAGED"
ARM
JAM NUT
FIG. 25
21