To Replace Mower Drive Belt - Craftsman 917.257740 Owner's Manual

CE ADJUSTMENTS
FRONT-TO-BACK ADJUSTMENT (See Figs. 23 and 24) -
IMPORTANT: DECK MUST BE LEVEL SIDE-TO-SIDE. IF
THE FOLLOWING FRONT-TO-SACK 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
positiono
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 nut"H" against trunnion on both frontlinkso
o To raise front of mower housing, loosen nut H' from
trunnion on both front links° Tighter] nut "G" on both
front links an equa! number of turns°
o When distance 'F' is 1/8" 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.
TO REPLACE MOWER DRIVE BELT
MOWER DRIVE BELT REMOVAL (See Fig. 25) -
• Park tractor on a level surface° Engage parking brake.
o Remove four screws from Loll., mandrel cover' and
remove cover,
o Roll belt over the top of Loll. mandrel pulley.
• Remove belt from electric clutch pulley
= Remove belt from idler pulleys
° Remove any dirt or grass clippings which may have
accumufated around mandrels and entire upper deck
surface.
o 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.
o Install new belt onto electric dutch pulley_
. Rol! belt into upper groove of L,H. mandrel pulley,
o Carefully check belt routing making sure belt is in the
grooves correctly and inside belt keepers.
o Reassemble L,H, mandrel cover.
";_ % • I _' °I j,.MANDREL
FIG. 23
BOTH FRONT LINKS SHOULD BE EQUAL tN LENGTH
NU'I
FRONTLINKS
FIG. 24
20
SCREWS
L,H,
MANDREL
COVER
MANDREL
MOWER
DRIVE
BELT
SPRING
IDLER
PULLEYS
PRIMARY
IDLER
ARM
BELT
KEEPERS
FIG. 25
ELECTRIC
CLUTCH
PULLEY
BOLT IN
ROUSING