Craftsman 247.88835 Operator's Manual page 20

5. After the spark plug is seated, tighten with a spark plug wrench to
compress the washer.
NOTE: When installing a new spark plug, tighten 1⁄2-turn after the
spark plug seats to compress the washer. When reinstalling a used
spark plug, tighten 1⁄8- to 1⁄4-turn after the spark plug seats to
compress the washer.
CAUTION
The spark plug must be tightened securely. A loose spark plug can
become very hot and can damage the engine.
CARBURETOR ADJUSTMENT
The carburetor is not user adjustable. Contact Sears Parts & Repair for
adjustment.
LUBRICATION
Drive and Shifting Mechanism
At least once a season or after every 25 hours of operation, remove
rear cover. Lubricate all chains, sprockets, gears, bearings, shafts, and
the shifting mechanism. Use engine oil or a spray lubricant. Refer to
Figure 22.
NOTE: Before tipping the unit on the front housing, run the fuel tank
empty so fuel does not leak out of the fuel cap.
1. Carefully pivot the snow thrower up and forward so that it rests on
the auger housing.
2. Remove the frame cover from the underside of the snow thrower
by removing the self-tapping screws which secure it. Refer to
Figure 27.
3. Apply a light coating of engine oil (or 3-in-1 oil) to the hex shaft.
See Fig. 22.
NOTE: Be careful not to get any oil on the aluminum drive plate or
rubber friction wheel. Doing so will hinder the snow thrower's drive
system. Wipe off any excess or spilled oil.
4. At least once a season grease the wheel axle with Arctic grease,
part number 737-0318. The grease fitting is located on the
wheel axle tube behind the wheel axle support bracket.
Rubber Friction
Wheel
Hex Shaft
Aluminum
Drive Plate
Wheel Axle
Support Bracket
SERVICE AND MAINTENANCE
Figure 22
Wheels
At least once a season, remove both wheels. Clean and coat the axles
with a multipurpose automotive grease before reinstalling wheels.
Chute Directional Control
Once a season, lubricate the eye bolt bushing and the spiral with 3-in-1
oil.
Auger Shaft
At least once a season, one at a time, remove all of the shear pins
from the auger shaft. Spray lubricant inside the hub of each auger
spiral assembly and around the spacers on the auger shaft.
Grease fittings can also be found at each end of the auger shaft.
Lubricate with a grease gun once a season. See Figure 23.
Gear Case
The auger gear case is equipped with a grease fitting. Lubricate with
grease once a season (order part number 737-0168). See Figure 6-2.
NOTE: To relieve pressure, remove the vent plug before lubricating the
gear case. See Figure 23. Failure to do so could result in damage to
the gear case seals.
Augers
Each of the auger spiral assemblies is secured to the spiral shaft with
a shear pin and cotter pin. If the auger should strike a foreign object or
ice jam, the snow thrower is designed so that the pins may shear.
1. If augers do not turn, check to see if pins have sheared.
2. Replace the pins if needed. Two replacement shear pins and
cotter pins have been provided with the snow thrower. Spray an
oil lubricant into shaft before inserting new pins and securing with
new cotter pins. See Fig. 23.
Shear Pins
Bow-Tie Pins
20
Vent Plug
Grease Fitting
Spacers
Figure 23