Murray 621501 31NB Series, Instruction Book

Page: 13 / 28

ENGLISH
13
1740272
3. Remove the auger pulley (1) from the auger
shaft (threads are left hand; turn clockwise to
remove).
4. To keep the auger (6) from rotating, set a
2”x4” piece of wood (2) on the center
paddle (3) to secure auger (6).
5. Remove the fasteners from the bearing as-
sembly (4) . Remove the bearing assembly
(4) from the auger housing (5).
6. Slide the auger (6) out of the bearing assem-
bly on the right side of the snow thrower.
7. Tip the auger (6) enough to allow the auger
(6) to slide out of the auger housing (5).
8. To install auger (6), reverse the above steps.
How To Replace The Spark Plug
NOTE: This spark ignition system meets all
requirements of the Canadian Interference −
Causing Equipment Regulations.
NOTE: This engine complies with all current
Australian and New Zealand limitations elec-
tromagnetic interference.
The spark plug is housed in the engine compart-
ment under the top cover and cannot be seen
under normal conditions.
1.
(Figure 13) Open the spark plug access door
(1) on the control panel.
2. The spark plug and wire are now visible.
3. Remove the spark plug wire.
4. Clean the area around the spark plug base to
prevent dirt from entering the engine when the
spark plug is removed.
5. Remove the spark plug.
6. Check the spark plug. If the spark plug is
cracked, fouled or dirty, it must be replaced .
7. (Figure 14) Set the gap between the elec-
trodes of the new spark plug at .030 inch. Next,
install the spark plug in the cylinder head and
firmly tighten. Recommended torque is 18 to
20 foot pounds.
How To Prepare The Snow Thrower For
Storage
WARNING: Do not remove gasoline
while inside a building, near a fire,
or while you smoke. Gasoline
fumes can cause an explosion or a fire.
If the snow thrower is to be stored for an ex-
tended period, refer to the engine manufactur-
er’s operating manual (included with some
models) for important maintenance or storage
details.
1. Drain the fuel tank.
2. Let the engine run until it is out of gasoline.
3. Never store the snow thrower with fuel in the
tank inside a building where ignition sources
are present such as hot water and space
heaters, clothes dryers, and the like. Allow
the engine (motor) to cool before storing in
any enclosure.
4. Remove the spark plug from the cylinder.
Pour one ounce of oil into the cylinder. Slow-
ly pull the recoil − start grip so that the oil will
protect the cylinder. Install a new spark plug
in the cylinder.
5. Thoroughly clean the snow thrower.
6. Lubricate all lubrication points. See the Main-
tenance section.
7. Be sure that all nuts, bolts and screws are
securely fastened. Inspect all visible moving
parts for damage, breakage and wear. Re-
place if necessary.
8. Cover the bare metal parts of the blower
housing and auger with spray rust preventa-
tive lubricant.
9. Put the unit in a building that has good ven-
tilation.
10.If the machine must be stored outdoors,
block up the snow thrower to be sure the en-
tire machine is off the ground.
11. Cover the snow thrower with a suitable pro-
tective cover that does not retain moisture.
Do not use plastic.
How To Order Replacement Parts
The replacement parts are shown either on the
back pages of this Instruction Book or in a
separate Parts List Book.
Use only manufacturer’s authorized or approved
replacement parts. The letter placed on the end
of the part number denotes the type of finish for
the part, C for chrome, Z for zinc, a PA for
purchased assembly. It is important that you
include this when ordering a part. Do not use
attachments or accessories not specifically
recommended for this unit. In order to obtain
proper replacement parts you must supply the
model number (see nameplate).
Replacement parts, except for the engine, trans-
mission, transaxle or differential, are available
from the store where the mower was purchased
or a service shop recommended by the store.
Warranty service is available only through Autho-
rized Service Dealers. Locate your nearest dealer
in our locator map at www.murray.com.
Replacement parts for the engine, transaxle, or
transmission, are available from the manufac-
turer’s authorized service centre found in the
commercial pages of the telephone directory.
Also, see the individual engine or transmission
warranties to order replacement parts.
When ordering the following information is
required:
(1) The Model Number
(2) Serial Number
(3) Part Number
(4) Quantity
TROUBLE SHOOTING CHART
TROUBLE CAUSE CORRECTION
Difficult starting Defective spark plug. Replace spark plug.
Water or dirt in fuel system. Use carburetor bowl drain to flush and refill with
fresh fuel.
Engine runs erratic Blocked fuel line, empty gas tank, or stale
gasoline
Clean fuel line; check fuel supply; add fresh
gasoline
Engine stalls Unit running on CHOKE. Set choke lever to RUN position.
Engine runs erratic;
Loss of power
Water or dirt in fuel system. Use carburetor bowl drain to flush and refill with
fresh fuel.
Excessive vibration Loose parts: damaged impeller Stop engine immediately and disconnect spark
plug wire. Tighten all bolts and make all
necessary repairs. If vibration continues, have
the unit serviced by a competent repairman.
Unit fails to propel itself Drive belt loose or damaged. Replace drive belt.
Unit fails to discharge snow Auger drive belt loose or damaged. Adjust auger drive belt; replace if damaged.
Auger control cable not adjusted correctly. Adjust auger control cable.
Discharge chute clogged. Stop engine immediately and disconnect spark
plug wire. Clean discharge chute and inside of
auger housing.
Foreign object lodged in auger Stop engine immediately and disconnect spark
plug wire. Remove object from auger.