Sears 917.251551 Lawn Mower User Manual


 
CUSTO E ESPONSMBmL ES
TRACTOR
Always observe safety rules when performing any mainte-
nance.
BRAKE OPERATION
If tractor requires more than six (6) feet stopping distance
at high speed in highest gear, then brake must be adjusted.
(See "TO ADJUST BRAKE" in the Service and Adjust-
ments section of this manua0.
TIRES
Maintain proper air pressure in all tires (See "PROD-
UCT SPECIFICATIONS" on page 3 of this manual).
. Keep tires free of gasoline, oil, or insect control chemi-
cals which can harm rubber,
Avoid stumps, stones, deep ruts, sharp objects and
other hazards that may cause tire damage.
BLADE CARE
For best results mower blades must be kept sharp, Re-
place bent or damaged blades
BLADE REMOVAL (See Fig. 11)
Raise mower to highest position to allow access to
blades.
Remove hex bott, lockwasher and flat washer securing
blade.
Install new or resharpened blade with trailing edge up
towards deck as shown.
Reassemble hex bolt, lock washer and flat washer in
exact order as shown
Tighten bolt securely (30-35 FL Lbs. torque)°
IMPORTANT: BLADE BOLT IS GRADE 8 HEATTREATED
NOTE: We do not recommend sharpening blade - but ifyou
do, be sure the blade is balanced.
MANDREL
BLADE ASSEMBLY
TRAILING
EDGE UP
FLAT WASHER,,, _. /
LOCKWASHER. /
HEX BOLT (GRADE 8)*__
*AGRADE BHEAT TREATED BOLT CAN BE
IDENTIFIEDBY SIXLINESON THE BOLT HEAD,
FIG.11
TO SHARPEN BLADE (See Fig. 12)
Care should be taken to keep the blade balance& An
unbalanced blade will cause excessive vibration and even-
tual damage to mower and engine,
° The blade can be sharpened with a file or on a gfinding
wheel. Do not attempt to sharpen while on the mower.
o To check blade balance, you will need a 5/8" diameter
steel bolt, pin, or a cone balancero (When using a cone
balancer, follow the instructions supplied with bal-
ancer)o
° Slide blade on to an unthreaded portion of the steel bolt
or pin and hold the bolt or pin parallel with the ground.
If blade is balanced, it should remain in a horizontal
position° If either end of the blade moves downward,
sharpen the heavy end untit the blade is balanced°
NOTE: Do not use a nail for balancing blade_ The lobes of
the center hole may appear to be centered, but are noL
CENTER HOLE
5t8" BOLT
OR PIN
BLADE
FIG. 12
V-BELTS
Check V-belts for deterioration and wear after 100 hours
and replace if necessary, The belts are not adjustable,,
Replace belts ifthey begin to slip from wear°
TRANSAXLE COOLING
Keep transaxie free from build-up of dirt and chaff which
can restrict cooling,
CHECK TRANSAXLE OIL LEVEL
(See Fig. 13)
° Block up rear axle securely,
° Remove left rear wheel by removing hub bolts.
° Remove filler plug from transaxle. Oil level must be
even with plug threads. If necessary, fill with SAE 30
motor oil, API-SF or SG. Replace filler plug,
* Reassemble wheel to hub.
o For approximate capacity see "PRODUCT SPECIFI-
CATIONS" on page 3 of this manual.,
O
O
o
O
TRANSAXLE
PLUG
FIG. 13
17