Sears 917.251551 manual Service a Adjustments, To Replace Mower Drive Belt

SERVICE A ADJUSTMENTS

FRONT-TO-BACK ADJUSTMENT (See Figs, 20 and 2!) -

IMPORTANT: DECK MUST BE LEVEL SIDE-TO-SIDE. IF THE FOLLOWING FRONT-TO-BACK ADJUSTMENT IS NECESSARY, BE SURETO 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,

°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°

oWhen 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, 22) -

°Park tractor on a level surface., Engage parking brake,

oRemove four screws from L.H_ mandrel cover and remove cover,

oRoll belt over the top of LHo mandrel pulley, o Remove belt from electric clutch pulley°

° Remove belt from idler 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,, 22) *

•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 putley_

•Carefully check belt routing making sure belt is in the grooves correctly and inside belt keepers,

. Reassemble L,H_ mandrel cover,,

L°H,		SPRING
MANDREL	SCREWS	ELECTRIC
COVER		CLUTCH
	IDLER	PULLEY

PULLEYS

PRIMARY

IDLER ARM

FIG. 2O

BOTH FRONT LINKS SHOULD BE EQUAL IN LENGTH

BOLT IN

MOWER

HOUSING

MANDREL

MOWER

DRIVE BELT

BELT KEEPERS

NUT "G"

FIG. 22

NUT "H"

FRONT LINKS

FIG. 21

21