To Replace Mower Drive Belt - Craftsman 917.250520 Owner's Manual

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SERVICE AND ADJUSTMENTS
FRONT-TO-BACK
ADJUSTMENT
(See Figs. 23 and 24) -
IMPORTANT:
DECK MUST BE LEVEL SIDE-TO-SIDE. IF
THE FOLLOWING
FRONT-TO-BACK
ADJUSTMENT
IS
NECESSARY, BE SURE TO ADJUST BOTH FRONT LINKS
EQUALLY SO MOWER WILL STAY LEVEL SIDE-TO-SIDE.
To obtain the best cutting results, the mower housing
should be adjusted so the front is approximately 1/8" to 1/2"
lower than the rear when the mower is in its highest
position,
Check adjustment on right side of tractor.
Measure dis-
tance "F" directly in front of and behind the mandrel at
bottom edge of mower housing as shown.
Before making any necessary adjustments, check that
both front links are equal in length.
o
If links are not equal in length, adjust one link to same
length as other link.
To lower front of mower housing, loosen nut"G"on both
front links an equal number of turns.
When distance "F" is 1/8" to 1/2" lower at front than
rear, tighten n ut"H" against trunnion on both front links.
°
To raise front of mower housing, loosen nut "H" from
trunnion on both front links. Tighten nut "G" on both
front links an equal number of turns.
°
When distance "F" is !/8" to 1/2" lower at front than
rear, tighten nut "H" against trunnion on both front
links.
NOTE:
Each full turn of nut "G" will change dim. "F" by
approximately 3/8".
°
Recheck side-to-side
adjustment.
MANDREL
FiG. 23
BOTH FRONT LINKS SHOULD BE EQUAL iN LENGTH
NUT "G"
NUT "H'
FRONT LINKS
TO REPLACE
MOWER
DRIVE BELT
MOWER DRIVE BELT REMOVAL (See Fig. 28) -
=
Park tractor on a level surface. Engage parking brake.
°
Remove four screws from LH. mandrel cover and
remove cover.
Roll belt over the top of L,H. mandrel pulley.
°
Remove belt from electric clutch pulley.
°
Remove belt from {dler pulleys.
°
Remove any dirt or grass clippings which may have
accumulated around mandrels and entire upper deck
surface.
=
Check primary idler arm and two idlers to see that they
rotate freely.
=
Be sure spring is securely hooked to primary idler arm
and bolt in mower housing.
MOWER DRIVE BELT INSTALLATION (See Fig, 25) -
°
Install belt in both idlers. Make sure belt is in both belt
keepers at the idlers as shown.
°
Install new belt onto electric clutch pulley.
Roll belt into upper groove of L.H. mandrel pulley.
Carefully check belt routing making sure belt is in the
grooves correctly and inside belt keepers.
Reassemble L.H. mandrel cover.
REMOVE LH.
MANDREL
ELECTRIC
COVER
SCREWS
CLUTCH
PULLEY
IDLER
PULLEYS
• SPRING
MANDREL
MOWER
DRIVE BELT
BELT
KEEPER
FiG. 25
FEG. 24
22

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