Tecumseh HMSK90, OHSK120, HMSK105, HMSK80, HMSK100 User Manual

OPERATOR'S

TECUMSEH

MANUAL

and MAINTENANCE INSTRUCTIONS for

TECUMSEH

MODELS

HMSK80 HMSK100

I

SNOW BLOWER ENGINE

HORIZONTAL CRANKSHAFT

AIR COOLED • FOUR-CYCLE ENGINE

THIS SYMBOL POINTS OUT IMPORTANT SAFETY INSTRUCTIONS WHICH IF NOT FOLLOWED COULD

_ ENDANGER THE PERSONAL SAFETY AND/OR PROPERTY OF YOURSELF AND OTHERS. READ AND

_ California Proposition 65 WARNING: The engine exhaust from this contains chemicals

FOLLOW ALL INSTRUCTIONS IN THIS MANUAL AND ANY PROVIDED WITH THE EQUIPMENT ON

WHICH THIS ENGINE IS USED BEFORE ATTEMPTING TO OPERATE YOUR TECUMSEH ENGINE.

THESE SYMBOLS MAY ,4,_._

APPEAR ON THE
ENGINE:

known to the State of California to cause cancer, birth defects or other reproductive harm.

V

FAST SLOW

STOP CHOKE IGNITION KEY INSERT TO REMOVE TO

HMSK90 HMSK105

OHSK120

RUN STOP

product

|llllfll|IIIfIIIIINII"]

MODEL AND

D.O.M. DECAL

CARBURETOR
COVER

IGNITION KEY

OR

IGNITION SWITCH

0

CHOKE

SPARK DIPSTICK

OIL FILL PLUG AND

SPARK

WIRE

lo-1-98181-639-14

FUEL FILL CAP

FUEL TANK

-- FUEL VALVE

'STARTER HANDLE

ER

i

OIL DRAIN PLUG

CONTROL LEVER
(IF SO EQUIPPED)

DIL DRAINPLUG (IF SO EQUIPPED)

Figure 1

Page 1

181-639-14

ENGINE WHICH ARE CERTIFIED TO COMPLY WITH CALIFORNIA AND
U.S.EPAEMISSIONREGULATIONS FORULGE ENGINES: Arecertifiedto

operateon regularunleaded gasoline. Include the following emission control
system(s): EM, TWC (if so equipped); Do not include any user adjustable
features - therefore no other adjustments are needed.

OIL & FUEL RECOMMENDATIONS

TO OPERATE ENGINE, YOU WILL NEED THE FOLLOWING:

Q A CLEAN, HIGH QUALITY DETERGENT OIL.

Be sure original container is marked:

A.P.I. service "SF" - "SJ",

FOR SUMMER (ABOVE 32°F; 0°C): USE SAE 30 OIL.

Tecumseh specially formulated oilis available at any Authorized
Tecumseh Service Outlet. Order as part number 730225. Using
multigrade oil will increase oil consumption.

FOR WINTER (BELOW 32°F; 0°C): USE SAE 5W30 OIL.

Tecumseh specially formulated oil isavailable atany Authorized
Tecumseh Service Outlet. Order as part number 730226.

(SAE 10W is an acceptable substitute.)
BELOW 0°F (-18°C) ON LY: SAE 0W30 isan acceptable substitute.

DO NOT USE SAE 10W40 OIL.

OIL SUMP CAPACITY:

Models HM80-90-100-105: 26 ounces (1-5/8 U.S. pints)

.77 liter

Model OHSK120: 28 ounces (1-3/4 U.S. pints)

.83 liter

(_A FRESH, CLEAN, UNLEADED REGULAR,

UNLEADED PREMIUM, OR REFORMULATED
AUTOMOTIVE GASOLINE ONLY. DO NOT USE

LEADED GASOLINE.

NOTE: DO NOT USE GASOLINE CONTAINING METHANOL

(WOOD ALCOHOL). Gasoline containing up to 10% ethanol or
grain alcohol ("Gasoh0F), or up to 15% MTBE (Methyl Tertiary
Butyl Ether), may be used but requires special care when engine

is unused for extended periods. See "STORAGE" instructions on
Page 5.
NOTE: Use clean oil and fuel and store in approved, clean,

covered containers. Use clean fill funnels. Never use "stale"
gasoline left over from last season or stored for long periods.

,¢

BEFORE STARTING

(_) READ ALL INSTRUCTIONS PROVIDED WITH THE EQUIPMENT

ON WHICH THIS ENGINE IS USED.

BEFORE STARTING (Continued)

(_) FILL FUEL TANK:

A. Clean area around fuel fill cap, remove cap.

B. Add "UNLEADED" regular gasoline, slowly, to fuel tank. Use

a funnel to prevent spillage.

IMPORTANT: NEVER MIX OIL WITH GASOLINE

C. Install fuel fill cap and wipe up any spilled gasoline.

,_ NEVER FILL FUEL TANK INDOORS. NEVER FILL FUEL

TANK WHEN ENGINE IS RUNNING OR HOT. DO NOT

I SMOKE WHEN FILLING FUEL TANK.

a NEVER FILL FUEL TANK COMPLETELY. FILL TANKTO

1/2" BELOW BOTTOM OF FILLER NECK TO PROVIDE
SPACE FOR FUEL EXPANSION. WIPE ANY FUEL
SPILLAGE FROM ENGINE AND EQUIPMENT BEFORE
STARTING ENGINE.

_1= ANY LIQUEFIED PETROLEUM (LPG) OR NATURAL GAS

FUEL SYSTEM MUST BE LEAKPROOF AND MEET ALL

l APPLICABLE CODES AND REGULATIONS.

CHECK THE FOLLOWING:

A. BE SURE EQUIPMENT IS IN NEUTRAL GEAR WITH

dl_ CLUTCHES, BELTS, CHAINS AND SAFETY SWITCHES

DISENGAGED. (FOLLOW EQUIPMENT MANUFACTUR-
ER'S INSTR UCTIONS.) THIS SHOULD PLACE ANY SAFE-

TY SWITCHES IN SAFE STARTING POSITION.

B. Be sure spark plug wire is attached to spark plug (see Figure

1).

C. Be sure:

Ignition switch on engine or equipment is in "ON", "RUN"
or "START" position.

OR

Ignition key (if so equipped see Figure 2) is inserted into
ignition keyslot in carburetor cover (see Figure 1).

DO NOT TURN IGNITION KEY.

D. Be sure fuel valve is open (see Figure 3).

ENGINE WILL NOT START
UNLESS IGNITION KEY IS

INSERTED INTO IGNITION

KEYSLOT IN CARBURETOR

COVER.

DO NOT TURN IGNITION KEY.

I°l

IGNITION KEY

Figure 2

(_) TO FILL OIL SUMP OR CHECK OIL LEVEL:

IMPORTANT: To avoid engine damage never run engine unless:

Oil level is between "FULL" and "ADD" marks on dipstick.
Oil fill plug is tightened securely into 0il fill tube or hole.

CHECK OIL LEVEL OFTEN DURING ENGINE BREAK-IN.
A. POSITION EQUIPMENT SO ENGINE IS LEVEL.

B. Clean area around oil fill plug (see Figure 1).

C. Remove oil fill plug and dipstick.
D. Wipe dipstick clean, insert it into 0il fill hole and tighten

securely. Remove dipstick. If oil is not up to "FULU' mark on
dipstick, add recommended oil. POUR SLOWLY. Wipe dipstick

clean each time oil level is checked.

IMPORTANT: DO NOT FILL ABOVE "FULL" MARK ON

DIPSTICK.

E. Install oil fill plug and dipstick, tighten securely.

See "MAINTENANCE" section for further oil instructions.

FUEl

"OPEN" POSITION

SHOWN

Page 2 181-639-14

/_ TURN CLOCKWISE TO

Figure 3

"OFF" POSITION

STARTING

_ NEVER RUN ENGINE INDOORS OR IN ENCLOSED, POORLY

VENTILATED AREAS. ENGINE EXHAUST CONTAINS
CARBON MONOXIDE, AN ODORLESS AND DEADLY GAS

(CARBON MONOXIDE IS ALSO PRESENT IN ENGINE

EXHAUST FROM LIQUID PETROLEUM (LPG) AND NATURAL

GAS FUEL SYSTEMS)

_KEEP HANDS, FEET, HAIR AND LOOSE CLOTHING AWAY

FROM ANY MOVING PARTS ON ENGINE AND EQUIPMENT.
NEVER LEAVE EQUIPMENT UNATTENDED WHEN ENGINE

IS OPERATING.
WARNING - TEMPERATURE OF MUFFLER AND NEARBY

AREAS MAY EXCEED 150°F (65°C). AVOID THESE AREAS.

(_ RECOIL STARTER (see Figure 1):

A. Move equipment control (see equipment manufacturer's

instructions) or engine control lever to "FAST" or "START"
position.

B. Move engine choke to "FULL".

NOTE: IF RESTARTING A WARM ENGINE AFTER A

SHORT SHUTDOWN:

1. MOVE CHOKE TO"OFF' INSTEAD OF "FULL'.

2. PUSH PRIMER ONCE ONLY.

C. Push primer three times (see Figure 4). ALWAYS COVER

"VENT HOLE" when pushing primer. See warm engine restart
"NOTE" above.

D. Grasp starter handle (see Figure 1) and pull rope out, slowly,

until it pulls slightly harder. Let rope rewind slowly. Then pull
rope with a rapid full arm stroke. Let rope return to starter

slowly.
NOTE: If RECOIL STARTER is frozen and will not crank

engine, proceed as follows:

1. Pull as much rope out of starter as possible.

2. Release starter handle and let itsnap back against

starter.

NOTE: The above should be done only when

necessary to free a frozen starter.

E. Repeat instructionD until engine starts.

Ifengine fails tostart, repeat instructions Cand Das necessary,

until engine starts.
F. When engine starts, move choke gradually to "OFF".
G. If engine falters, move choke immediately to "FULL" and then

gradually to "OFF".

STARTING (continued)

A. Connect power cord to switchbox on engine.
B. Plug other end of power cord (see Figure 5) into wall

receptacle.
IMPORTANT: When connecting power cord, always con-

nect power cord to switch box on engine first; then into wall
receptacle.

C. Move equipment control (see equipment manufacturer's

instructions) or engine control lever to "FAST" or "START"
position.

D. Move engine choke to "FULL".
E. Push primer two or three times, making sure to cover vent

hole when pushing (see Figure 4). In temperatures below

15°F (-10°C), additional priming may be required.

VENT HOLE

Figure 4

NOTE: If restarting a warm engine after a short shutdown:

1. Leave choke in "OFF" position.

2. Push primer one time only.

F. Push starter button (see Figure 5) or turn ignition switch key

(see equipment manufacturer's instructions) to crank en-
gine.

G. When engine starts, release starter button and move choke

gradually to "OFF".

H. Ifengine falters, move choke immediately to "FULL" and then

gradually to "OFF".

I. Disconnect power cord (see Figure 5) from walt receptacle

first, and then from switchbox on engine.

IMPORTANT: When disconnecting power cord, always unplug

wall receptacle end first; then unplug switchbox on engine.

NOTE: The electric starter is thermally protected. If overheated,

it will stop automatically and can be restarted only when
it has cooled to a safe temperature (a wait of approxi-
mately 5-10 minutes is required).

If, after following the preceding instructions, the engine does not

start, have it checked by your Authorized Tecumseh Service
Outlet.

(_) ELECTRIC STARTER (seeFigure5)

_IkWARNING: THE 120V A.CoSTARTER IS EQUIPPED WITH A

THREE-WIRE POWER CORD AND PLUG, AND IS DESIGNED
TO OPERATE ON 120V A.C. HOUSEHOLD CURRENT. THE

STARTER MUST BE PROPERLY GROUNDED ATALL TIMES
TO AVOID THE POSSIBILITY OF INJURY OR DEATH FROM
ELECTRICAL SHOCK. DETERMINE THAT YOUR HOUSE

WIRING ISA GROUND FAULT INTERRUPTED (G.F.L) THREE-
WIRE GROUNDED SYSTEM, OR ASK A LICENSED ELECTRI-
CIAN IF YOUR ARE NOT SURE. IF YOUR HOUSE WIRING

SYSTEM IS NOT A G.F.I. THREE-WIRE GROUNDED SYSTEM,
DO NOT USE THIS ELECTRIC STARTER UNDER ANY CON-

DITION. IF YOUR HOUSE WIRING SYSTEM IS GROUNDED
BUT A G.F.I. THREE-PRONG WALL RECEPTACLE IS NOT

AVAILABLE AT THE LOCATION YOUR STARTER WILL BE
USED, ONE SHOULD BE INSTALLED BY A LICENSED ELEC-

TRICIAN.
NOTE: If your engine is equipped with a 12V battery-operated

electric starter, disregard instructions regarding power cord.

Page 3

SWITCHCORD "_t TO STARTER

SWITCHBOX_/x ./_;

POWERCORD _.)_

TO OUTLET

120V A.C. APPLICATION

Figure 5

181-639-14