Yard-Man 31AE993J401 Operator's Manual page 12

warranty, operator must maintain the snow thrower
as instructed in this manual.
• Some adjustments will have to be made
periodically to maintain your unit properly.
• All adjustments in the service and adjustments
sections of this manual should be checked at least
once each season.
• Follow the maintenance schedule given below.
• Periodically check all fasteners and hardware to
make sure these are tight.
Carburetor
WARNING:
to the engine while the engine is running
(e.g. carburetor), keep clear of all moving
parts. Be careful of heated surfaces and
mufflers.
Minor carburetor adjustments may be required to
compensate for differences in fuel temperature, altitude
and load. Refer to the engine manual for instructions.
Lubrication
Gear Shaft
Lubricate the gear shaft with 6-in-1 grease (part
number 737-0170) at least once a season, or after
every 25 hours of operation. Refer to Figure 10.
Keep all grease and oil off the rubber
IMPORTANT:
friction wheel and drive plate.
Engine
Refer to the separate engine manual packed with your
unit for all engine lubrication instructions.
Auger Shaft
• At least once a season, remove the shear bolts
from the auger shaft and spray lubricant inside the
shaft. See Figure 12.
Vent Plug
Shear Bolts
Figure 12
If any adjustments are made
Bearings
Discharge Chute
The base of the discharge chute and the spirals on the
chute crank should be lubricated at least every 25
hours of use. Apply the lubricant under the base of the
chute and where the spirals contact the discharge
chute. See Figure 13.
Lube Under Chute Base
Drive and Shifting Mechanism
At least once a season or after every 25 hours of
operation, remove rear cover. Lubricate any chains,
sprockets, gears, bearings, shafts, and the shifting
mechanism at least once a season. Use engine oil or a
spray lubricant. Avoid getting oil on rubber friction
wheel and aluminum drive plate. Refer to Figure 10.
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. Before
reassembling, remove old sealant and apply new
sealant. See Figure 12.
Do not overfill the gear case, since
IMPORTANT:
damage to the seals could result. Be sure the vent plug
is free of grease in order to relieve pressure.
Auger Bearings and Shaft
Every season lubricate the auger bearings and the
bearings on the side of the frame with light oil. See to
Figure 12.
Use oil or spray lubricant into the bearings at the
wheels at least once a season. Remove the wheels,
one side at a time, and clean and coat axles with multi-
purpose automotive grease.
Lubricate the auger shaft at least once a season. To do
this:
• Remove the shear bolts on the auger shaft.
• Oil or spray lubricant inside shaft.
• Carefully spin the auger around by hand to
disperse the lubricant.
• Reinstall the shear bolts.
12
Chute Crank Spirals
Figure 13