Craftsman 247.881700 Operator's Manual page 17

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.General Recommendations
1. Always observe safety rules when performing any maintenance.
2. The warranty on this snow thrower does not cover items that have
been subjected to operator abuse or negligence. To receive full
value from the warranty, operator must maintain the snow thrower
as instructed in this manual.
3. Periodically check all fasteners and hardware to make sure these
are tight.
Replacing the Shave Plate and
Skid Shoes
The shave plate and skid shoes on the bottom of the snow thrower are
subject to wear. These should be checked periodically and replaced
when necessary
1. To replace, remove two carriage bolts and nuts securing each skid shoe
to the auger housing. See Figure 15.
Shear Pin
Carriage Bolt
Shave Plate
Lock Nut
2. Reassemble new skid shoes with hardware just removed. Make sure the
skid shoes are adjusted to be level.
3. To remove shave plate: Remove both skid shoes and hardware
including carriage bolts and nuts which attach shave plate to the
snow thrower housing. For location of shave plate, see Figure 15.
4. Reassemble new shave plate, making sure heads of the carriage bolts
are to the inside of the housing. Reinstall skid shoes. Tighten securely.
Servicing Auger
The auger is secured to the spiral shaft with four shear pins and cotter
pins. If you hit a foreign object or ice jam, the snow thrower is designed
so that the pins may shear. Refer to Figure 15.
If the auger does not turn, check if the pins have sheared. Replace, if
needed, with proper shear pins. Refer to the Parts List in this manual
for the correct part number.
IMPORTANT: NEVER replace the auger shear pins with standard pins
or fasteners. Any damage to the auger gearbox or other components,
as a result of doing so, will NOT be covered by your snow thrower's
warranty.
MAINTENANCE & SERVICE
Cotter Pin
Skid Shoe
Carriage Bolt
Lock Nut
Figure 15
Lubrication
For a view of the lubrication points on the snow thrower, see Figure 16.
1. Lubricate pivot points on the auger control and drive control with a
light engine oil once a season.
2. Lubricate the auger idler bracket with a light engine oil once a season.
Engine
Listed below are general recommendations about maintaining your
snow thrower engine.
1. Before operating snow thrower, check the oil level.
2. Change engine oil after first five hours of operation and every 50
hours thereafter.
3. Clean spark plug and reset the electrode gap to 0.030" at least
once a season or every 100 hours of operation; replace every 200
hours of operation.
17
Figure 16