To Replace Mower Blade Drive Belt; To Adjust Brake; To Adjust Attachment Clutch - Craftsman 917.255981 Owner's Manual

SERVICE AND ADJUSTMENTS
lunl iiiiii
TO REPLACE MOWER BLADE DRIVE BELT
(See Fig. 28)
Park the tractor on level surface. Engage parking brake,
- Remove mowerdrive belt (See'_FO REPLACE MOWER
DRIVE BELT" in this section of this manual).
o Remove mower (See "TO REMOVE MOWER" in this
section of this manual)
• Remove four screws from Roll mandrel cover and
remove cover° Unhook spring from bolt on mower
housing°
. Carefully roll belt off Roll. 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 spring is hooked in secondary idler arm and
sway-bar bracket°
=
Install new belt in lower groove of LH, mandrel puiley,
idler pulley, and center mandrel pulley as shown.
- Roll belt over R,,H.,mandrel pulley. Make sure belt is in
all grooves propefly_
. Reconnect spring to bolt in mower housing and rein-
stall R.Ho mandrel cover.
. Reinstall mower to tractor (See "iNSTALL MOWER
AND DRIVE BELT' in the Assembly section of this
manual)o
Reassemble mower drive belt (See "TO REPLACE
MOWER DRIVE BELT" in this section of this manual).
@
L.H.
MOWER BLADE
DRIVE
CENTER
MANDREL
MANDREL
COVER
SECONDARY
IDLER ARM
SPRING
SWAY-BAR IDLER
BRACKET PULLEY
FIG. 28
TO ADJUST ATTACHMENT CLUTCH
(See Fig, 29)
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 inside of brake plate_
NOTE: After installing a new electric clutch, run tractor at
full throttle and engage and disengage electric c_utch 10
cycles to wear in clutch plate
ROTOR\ CLUTCH PLATE
SLOT (3_ _ '-'--' -- _ '--"
NYLON LOCKNLIT {3) BRAKE PLATE
FIG. 29
TO ADJUST BRAKE (See Fig. 30)
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 b rake must be adjusted°
IMPORTANT: DO NOT OVER TIGHTEN BRAKE. WHEN
DEPRESSING CLUTCH BRAKE PEDAL, THE MOTION
DRIVE BELT MUST STOP MOVING (DECLUTCH FROM
ENGINE PULLEY) BEFORE BRAKE ENGAGES.
IMPROPER ADJUSTMENT WILL CAUSE HARD SHIFTING
AND EXCESSIVE WEAR TO BRAKE LINING,
• Park and turn off the tractor on a level surface, Place
gear shift lever in neutral (N) position., Disengage
parking brake and be sure tractor does not rotl in either
direction_
o Lower mower deck (if installed on tractor)
. Snap out access hole cover on te{t side o{ tractor above
footrest,
o Loosen jam nut at clevis which wilt allow brake rod to be
rotated,,
• With pliers, from underside of frame, unscrew brake
rod from clevis four (4) to six (6) full turns,
• Start tractorwith gear shift lever in neutra_ (N) position.
• Slowly depress clutch/brake pedal to the point where
the motion drive belt stops moving., Hold clutch/brake
peda_ in this position and engage parking brake. !{belt
begins to move after engaging parking brake, reset
parking brake by depressing clutch/brake pedal slightfy
to next notch on parking brake.
° Stop engine. Screw brake rod back into clevis until
clevis pin is against rear edge of slot in brake arm, Do
not over tighten (see "IMPORTANT' above)
• Tighten jam nut against clevis_
. Replace access hole cover,
• Road test tractor for proper stopping distance and
declutching as stated above Readjust if necessary. If
proper adjustment cannot be attained, further mainte-
nance is necessary° Contact your nearest authorized
se rvice center/department.
21
CLEVt JAM N s _ \UT __._._ _
PIN
BR.,. E I \ LOJ' J
ARM / BR_,KE_) -- (_
_ LE__C_LE.Y.L_ ROD _ ___7
FIG. 30