MTD 248-670A User Manual

FIFTY CENTS

ASSEMBLY
OPERATION

MAINTENANCE
PARTS LIST

Important:

Read Safety Rules and

Instructions Carefully

Model Nos.

248-670A
248-680A

POWER

VACUUMS

PRINTED IN U.S.A.

FORM NO. 770-7467

LIMITED WARRANTY

For one year from the date of original retail purchase, MTD PRODUCTS INC will either
repair or replace, at its option, free of charge, F.O.B. factory or authorized service firm,

any part or parts found to be defective in material or workmanship. Transportation charges

under this warranty must be paid by the purchaser unless return is requested by MTD
PRODUCTS INC.

This warranty will not apply to any part which has become inoperative due to misuse,
excessive use, accident, neglect, improper maintenance, alterations, or unless the unit
has been operated and maintained in accordance with the instructions furnished. This
warranty does not apply to the engine, motor, battery, battery charger or component parts
thereof. Please refer to the applicable manufacturer’s warranty on these items.

This warranty will not apply where the unit has been used commercially.
Warranty service is available through your local authorized service dealer or distributor. If

you do not know the dealer or distributor in your area, please write to the Customer Service

Department of MTD.

The return of a complete unit will not be accepted by the factory unless prior written

permission has been extended by MTD.
This warranty gives you specific legal rights. You may also have other rights which vary

from state to state.

WARNING TO PURCHASERS

OF INTERNAL COMBUSTION ENGINE EQUIPPED

MACHINERY OR DEVICES IN THE STATE OF CALIFORNIA

The equipment which you have just purchased does not have a spark arrester. If this equipment is used on
any forest covered land, brush covered land, or grass covered unimproved land in the State of California,

before using on such land, the California law requires that a spark arrester be provided. In addition, spark

arrester is required by law to be in effective working order. The spark arrester must be attached to the
exhaust system and comply with Section 4442 of the California Public Resources Code.

IMPORTANT

It is suggested that this manual be read in its entirety before attempting to assemble or operate. Keep this

manual in a safe place for future reference and for ordering replacement parts.
This unit is shipped WITHOUT GASOLINE or OIL. After assembly, see operating section of this manual for

proper fuel and amount.

SAFE OPERATION PRACTICES FOR POWER VACUUMS

1. Read the operating and service instructing
manual carefully. Be thoroughly familiar with
the controls and proper use of the power

vacuum.

2. Never allow children to operate this power

vacuum.

3. Keep the area of operation clear of all per
sons, particularly small children and pets.

4. Check fuel before starting engine. Do not fill
fuel tank indoors, when engine is running, or
while engine is hot. Wipe off any spilled fuel
before starting engine.

5. Do not change engine governor settings.

6. Do not put hands near rotating parts for
any reason.

7. If the power vacuum should start to vibrate
abnormally, stop the engine and check

immediately for the cause. Vibration is

generally a warning of trouble.

8. Before cleaning, repairing or inspecting make
certain all moving parts have come to a
complete stop. Disconnect spark plug wire
and keep wire away from plug to prevent
accidental starting. Also keep throttle control

lever in the stop i^osition.

9. If the power vacuum should become blocked
with debris at any point shut engine off and
wait until the impeller comes to a complete
stop before attempting to remove the
obstruction. Disconnect spark plug wire to
prevent accidental starting.

10. Check all bolts for tightness at frequent

periods.

11. Never store this power vacuum with fuel in the
tank. Allow engine to cool before starting in
any enclosure.

12. Keep bag and equipment free of debris when
not in use.

13. Never operate this power vacuum unless air
duct and vacuum bag are properly affixed

in their place. Large zippered end of bag must
be closed when operating to prevent objects

from being blown out.

14. Never empty vacuum bag when engine is
running.

15. Never change inlet nozzle or auxiliary hose
attachment when engine is running.

16. The manufacturer recommends that the
operator wear safety glasses or some other
suitable eye protection when operating this

machine.

17. Check the vacuum bag frequently for wear and
replace when necessary.

ASSEMBLY OPERATION

INSTRUCTIONS

(Refer to figures 1, 2 and 3)

1. Place the upper handle in position and fasten
with four (4) hex screws and hex centerlock

nuts provided.

2. Place the air duct liner in the elbow of the air
duct and fasten in position as you assemble
the air duct in step 3. (See figure 1.)

3. Place the air duct in position on the blower

housing and fasten with four (4) flat washers

and hex nuts provided.

4. Slide the vacuum bag over the back of the

upper handle and snap the four flaps to hold

the bag.

5. Fasten the deflector on the top of the air duct
with three hex screws, flat washers and hex

nuts. (See figure 1.)

6. Slide the bag over the air duct.

7. Fasten the nozzle to the front of the vacuum
with four flat washers and thumb nuts

provided.

8. Use the following steps on the self propelled

unit only.

9. Fasten the throttle control to the right hand
side of the upper handle with one hex screw
and hex center locknut provided.

10. Secure throttle control cable to the lower

handle with the cable clip provided.

NOTE

Cable clip must be assembled to

lower handle with the open end

towards the engine. This will pre
vent wear to the bag.

11. Place ferrule through control lever.

12. Place flat washer over ferrule and thread
control rod into ferrule about eight or nine
turns.

13. Hook formed end of control rod in the shifting

finger.

14. Place curved face of spacer towards the
outside of upper handle leh hand side.

15. Fasten control lever in position with hex
screw and two hex nuts provided.

16. Engage and disengage control lever, check for
free pivoting action. It may be necessary to

readjust the control rod.

1. Service engine with gas and oil. See engine
manual packed with vacuum for complete
instructions for care and maintenance of
engine. READ DIRECTIONS CAREFULLY.

START ENGINE

After the engine has been properly fueled and
oiled (refer to engine operating and maintenance
instructions), start engine in the following
manner.

PUSH MODEL

1. Move throttle control lever on engine to

START position.

2. Crank engine. Pull recoil with a quick firm
pull. Do not pull out so far that rope stops

with a jerk as this will cause rope failure. Do

not allow rope and handle to snap back into
place.

3. After two or three full firm pulls on recoil (or

as soon as engine fires), move speed control

to run position.

4. Operate a new engine at intermediate speeds

and light load for the first few hours as you

would a new automotive engine.

5. To stop engine, move speed control lever on

engine to STOP position.

6. If carburetor needs adjustment to start or for

operation, see “Carburetor Readjustment”
section.

SELF PROPELLED MODEL

1. Place drive engagement lever in the neutral

position (towards the operator).

2. Move throttle control lever on handle to

START position.

3. Crank engine. Pull recoil with a quick firm
pull. Do not pull out so far that rope stops
with a jerk as this will cause rope failure. Do
not allow rope and handle to snap back into
place.