MTD 643 - Manual (Page 12)

12
wheel hub.This position gives power drive to the left
wheel only, making the unit easier to maneuver.
Both Wheels Driving
• Rotate wheel assembly to align hole in the hub with
the inner hole on the axle shaft. Insert klick pin in
the hole. Outer axle shaft hole should be visible.
IMPORTANT: NEVER operate the snow thrower with the
click pin inserted through both the RIM and the
OUTSIDE HOLE in the axle. Doing so can result in
serious damage to the drive system.
Figure 12
SECTION 6: MAINTAINING YOUR SNOW THROWER
WARNING: Before lubricating, repairing,
or inspecting, disengage all clutch levers
and stop engine. Wait until all moving
parts have come to a complete stop.
Disconnect spark plug wire and ground it
against the engine to prevent unintended
starting.
Lubrication
Engine
Refer to the separate engine manual packed with your
unit for all engine lubrication instructions.
WARNING: If any adjustments need to be
made to the engine while the engine is
running (e.g. carburetor), keep clear of all
moving parts. Be careful of muffler, engine
and other surrounding heated surfaces.
Wheels
• Oil or spray lubricant into bearings at wheels at
least once a season. Pull klick pin, remove wheels,
clean and coat axles with a multipurpose
automotive grease. See Figure 13.
Figure 13
Chute Directional Control
• The worm gear on the chute directional control
should be greased with multipurpose automotive
grease.
Gear Shaft
Lubricate the gear shaft with 6-n-1 grease at least once
a season or after every 25 hours of operation (available
at automotive stores, or order part number 737-0170).
Refer to Figure 9.
IMPORTANT: Keep all grease and oil off of the rubber
friction wheel and aluminum drive plate.
Gear Case
The gear case is lubricated with grease at the factory
and it does not require checking. If disassembled for
any reason, lubricate with 2 ounces of Shell Alvania
grease EPR00, part number 737-0168.
IMPORTANT: Do not overfill the gear case, since
damage to the seals could result. Be sure the vent plug
is free of grease in order to relieve pressure.
See Figure 14.
Auger Shaft
At least once a season, remove the shear bolts on the
auger shaft. Spray lubricant inside the shaft and
lubricate the plastic auger bearings at least once a
season. See Figure 14.
Figure 14
Inside Hole
In Axle
Click Pin In
Outside Hole
Klick Pin
Axle
Vent Plug
Shear Bolts
Plastic
Bearing Plastic
Bearing