Sears 917.257720 owner manual Service and AOJ Stments, To Replace Mower DRIVE. Belt

SERVICE AND AOJ STMENTS

FRONT-TO-BACK ADJUSTMENT (See Figs. 24 and 25) -

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, checkthat both front links are equal in length:

•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.

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"o

•Recheck side-to-side adjustment.

TO REPLACE MOWER DRIVE. BELT

MOWER DRIVE BELT REMOVAL (See Fig. 26) o

•Park tractor on a level surface. Engage parking brake.

•Remove four screws from L.H. mandrel cover and remove cover.

Rol! belt over the top of L.H. mandrel pulley.

o Remove belt from electric dutch pulley.

•Remove belt from idler pulleys.

oRemove any dirt or grass clippings which may have accumulated around mandrels and entire upper deck surface.

oCheck primary idler arm and two idlers to see that they rotate freely.

oBe sure spring is securely hooked to primary idler arm and bolt in mower housing.

MOWER DRIVE BELT INSTALLATION (See Fig. 26) -

•Install belt in both idlers. Make sure belt is in both belt keepers at the idlers as shown.

o 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.

o Reassemble L.H. mandrel cover.

SCREWS

SPRING

"F" _ _ "F"

G ROU N_DL_NE

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FIG. 24

BOTH FRONT LINKS SHOULD BE EQUAL IN LENGTH

i:iii!_

BOLT IN

HOUSING

FIG, 26

NUT "H"

FRONT LINKS

FiG. 25

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