To Level Mower Housing; Side-To-Side Adjustment; Front-To-Back Adjustment - Craftsman 3One 917.254860 Owner's Manual

SERVICE AND ADJUSTMENTS
TO LEVEL MOWER HOUSING
FRONT-TO-BACK ADJUSTMENT(See Figs. 22 and23) -
Adjust the mower while tractor is parked on level ground or
driveway. Make sure tires are properly inflated (See
"PRODUCT SPECIFICATIONS" on page 3). If tires are
over or under inflated, you wilt not properly adjust your
mower.
SIDE-TO-SIDE ADJUSTMENT (See Figs. 20 and 2!)
You wilt need two (2) standard 2 x 4 short pieces of wood
to make the following adjustment. Similar blocks measur-
ing 1-112" thick may also be used.
- Raise mower with attachment lift control to allow two
(2) t -t/2" thick blocks to be placed under rear edge of
mower.
- Place one block directly behind the left mandrel. Place
the remaining block under the stamped ridge on the
right rear edge of mower deck.
Lower mower deck to its lowest height of cut position
(See "TO ADJUST MOWER CUTTING HEIGHT" in
Operation section of this manual).
On both sides of tractor, loosen, but do not remove, the
fasteners securing the adjustable pivot brackets to
frame. Both brackets must be loose enough to move
freely.
• Pull down firmly on suspension arm to remove any
slack in pivot bracket and hold while tightening rear
fastener first to-secure. Tighten remaining fastener.
- Repeat procedure on other side of tractor.
Raise mower with attachment lift control and remove
blocks from under rnower.
PLACE TWO (2) 1-112" THICK BLOCKS UNDER REAR EDGE OF
DECK (Use wood 2 x 4's or equiv.)
DIRECTLY
BEHIND f ._,
ST A MP E D .-,._,,.,._,.,_ t, " ::._;,: :7
MOWER MUST BE tN LOWEST HEIGHT OF CUT POSITION
FIG. 20
FASTEN__
ADJUSTABLE PIVOT
BRACKET
PULL DOWN AND TIGHTEN
REAR FASTENER FIRST
F_G. 2t
iMPORTANT: DECK MUST BE LEVEL SIDE-TO-SIDE. tF
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 that the front is approximately 1/4" to
3/4" lower than the rear when the mower is in its highest
position.
Check adjustment on right side of tractor. Measure dis-
ta ce D d_recttytn front and behind the mandretat bottom
edge of mower housing as shown.
Before making any necessary adjustments, checkthat
both front links are equal in length. Both links should
be approximately 10-3/8".
If links are not equal in length, adjust one link to same
length as other link.
* To lower front of mower loosen nut "E" on both front
links an equal number of turns.
When distance "D" is 1/4" to 3/4" lower at front than
rear, tighten nuts "F" against trunnion on both front
links.
e To raise front of mower, loosen nut "F" from trunnion on
both front links. Tighten nut "E" on both front links an
equal number of turns.
- When distance "D" is 1/4" to 3/4" lower at front than
rear, tighten nut"F" against trun niGh on both front links.
Recheck side-to-side adjustment.
FIG. 22
BOTH FRONT LINKS MUST BE EQUAL IN LENGTH
.... ____ NUT
FRONT LINKS TRUNNION
FIG. 23
2O