Service And Adjustments; To Replace Mower Drive Belt - Craftsman 917.255981 Owner's Manual

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SERVICE AN ADJUSTMENTS
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TO REPLACE MOWER DRIVE BELT
MOWER DRIVE BELT REMOVAL (See Fig_ 27) -
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FRONT-TO-BACK ADJUSTMENT (See Figs. 25 and 26) -
IMPORTANT: DECK MUST BE LEVEL SIDE-TO-SIDE, IF
THE FOLLOWING FRONT-TO-BACK ADJUSTMENT tS
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.
o Before making any necessary adjustments, checkthat
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 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,
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 ful! turn of nut "G" will change dim. "F" by
approximately 3/8%
- Recheck side-to-side adjustment.
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i GROUND LINE I "
2!77777727/17<ttiltlt71ttifi7tlli')tl1!11_
FIG. 25
BOTH FRONT LINKS SHOULD BE EQUAL IN LENGTH
NUT "G"
NUT "H
FRONT LINKS
Park tractor' on a level surface. Engage parking brake°
Remove four screws from L,H. mandrel cover and
remove cove ro
o Roll belt over the top of L,H_ mandrel pulley,
- Remove belt from electric clutch pulley.
o Remove belt from idler pulleys_
° Remove any dirt or grass ctppings which may have
accumulated around mandrels and entire upper deck
surfacer
° 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 INSTALLATIOt_ (See Fig. 27) -
° 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 LH. mandrel pulley.
° Carefully check belt routing making sure belt is in the
grooves correctly and inside belt keepers.
= Reassemble LH mandrelcover.
ELECTRIC
L.H. SPRING CLUTCH
MANDREL PULLEY
COVER IDLER
PULLEYS
'_ PRIMARY
IDLER
ARM
BOLT IN
MOWER
HOUSING
MANDREL
MOWER
DRIVE BELT
FIG, 27
FIG= 26 20