Sears Craftsman 917.251570 Owner's Manual page 23

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SERVICE AND ADJUSTMENTS
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NOTE: After installing a new electric clutch, run tractor at
fufl throttle and engage and disengage electric clutch 10
cycles to wear in clutch plate,,
TO REPLACE MOWER BLADE DRIVE BELT
(See Fig. 24)
Park the tractor on lever surface° Engage parking brake,,
• Remove mower ddve belt (See'TO REPLACE MOWER
DRIVE BELT" in this section of this manual),
• Remove mower (See "TO REMOVE MOWER" in this
section of this manual),
• Remove four screws from R.H,, mandrel cover and
remove cover° Unhook spring from bolt on mower
housing,,
. Carefully rolt beft off R.H, mandrel pulley,,
, Remove belt from center mandrel pulley, idler pulley,
and L,H° mandrel pulleyo
• Remove any dirt or grass which may have accumu-
lated around mandrels and entire upper deck surface.
o Check secondary idler arm and idler to see that they
rotate freely°
. Be sure spring 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 to tractor (See "INSTALL MOWER
AND DRIVE BELT" in the Assembly section of this
manual),
. Reassemble mower drive belt (See '`TO REPLACE
MOWER DRIVE BELT" in this section of this manual),,
FIG. 24
TO ADJUST ATTACHMENT CLUTCH
(See Fig. 25)
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 wilt 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°
+ Adjust the three nylon iocknuts until space between
clutch plate and rotor measures +012" at alt three slot
locations cut in side of brake plate,
ROTOR \ CLUTCH PLATE
SLOT (3 ,0! 2
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NYLON LOCI(NUT (3) BRAKE PLATE
FIG, 25
TO ADJUST BRAKE (See Fig. 26)
Your tractor is equipped with an adjustable brake system
which is mounted on the side of the transaxle
If tractor requires more than six (6) feet stopping distance
at high speed in highest gear, then brake must be adjusted,
° 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 1-1/2", loosen jam nut and turn
nut "A" untit distance becomes I-1/2". 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/department,
WITH PARKING BRAKE "ENGAGED"
NUT "A"
JAM NUT
OPERATING
FIG+ 26
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