MTD 24677C User Manual

OWNER’S GUIDE

POWER

VACUUMS

1.00

Important:

Read Safety Rules and
Instructions Carefully

Model Numbers

246-675-000

246-685-000
245-689-000

24677C

24687C

Thank you for purchasing
an American-built product.

PRINTED IN U.S.A.

FORM NO. 770-5208A

INDEX

Safe Operation Practices.............................................. 3

Assembly Instructions .................................................. 4

Operation
Adjustments . : . .

Lubrication ........................................................... 10

...

.............................................................. 9

....

................... 9

Instri étions given with this symbol are

A

for personal safety. Be sure to follow
them

Maintenance

Off-Season Storage

Illustrated Parts

Replacement Parts List ........................................13, 15

.............................................................

..................................................

....................................................12, 14

K
1

^1^^ ^ WARNING I

This unit is equipped with an internal combustion engine and should not be used on or near any unimproved
forest-covered, bursh-covered or grass-covered lard unless the engine's exhaust system is equipped with a sparL­arrester meeting applicable local or state laws (if any). If a spark arrester is used, it should be maintained in effect!
working order by the operator.

In the State of California the above is required >y law (Section 4442 of the California Public Resources Code).
Other states may have similar laws. Federal laws apply on federal lands. A spark arrester muffler is available at your
nearest engine authorized service center.

A

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 separate engine manual for proper
fuel and engine oil recommendations.

IMPORTANT

SAFE OPERATION PRACTICES FOR POWER VACUUMS

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

2. Never allow children to operate this power
vaccum.

3. Keep the area of operation clear of all persons,
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.

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 immedi
ately for the cause. Vibration is generally a
warning of trouble.

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 storing 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 attach
ment when engine is running.

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

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

position.

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.

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

18. Never operate as a leaf blower unless impeller
guard and guard assembly are properly affixed in
their place.

19. Exercise caution whenever operating as a leaf
blower. Do Not allow discharge to be pointed in
the direction of persons.

20. No one should operate this unit while intoxicated
or while taking medication that impairs the senses
reactions.

FIGURE 1

ASSEMBLY

INSTRUCTIONS

CONTENTS OF HARDWARE PACK

(See figure 1)

A (1) Clutch Grip Assembly*
B (1) Hair Pin Cotter*
C (1) Clevis Pin*

D (1) Extension Spring*

E (1) Lock Nut 1/4-20 Thread*

F (3) Hand Knobs
G (3) Belleville Washers
H (1) Heavy Flat Washer
I (4) Hex Bolts 1/4-20 x 1.75" Long

J (4) Hex Lock Nuts 1/4-20 Thread

K (2) Stud Pins

L (2) Push-on Speed Nuts

M (1) Hex Jam Nut 1/4-20 Thread*

LOOSE PARTS IN CARTON
(See figure 2)

Q

-----

FIGURE 2

W-

N (1) Nozzle
0 (1) Upper Handle
P (1) Air Duct Assembly
Q (1) Clutch Rod*

R (1) Directional Discharge Assembly
S (1) Impeller Guard
T (1) Bag

*Self-Propelled Models Only.

TOW BAR KIT- Standard with push models.

(See figure 3) Optional with self-propelled models.

U (2) Hex Bolts 5/16-18 X 1.00" Long
V (4) Shoulder Spacers

W (2) Hex Nut 5/16-18 Thread

X (1) Truss Machine Screw 1/4-20 X .75" Long
Y (1) Lock Washer 1/4" l.D.
Z (1) Hex Nut 1/4-20 Thread
AA (1) Shoulder Bolt
AB (2) Belleville Washers 3/8" l.D.

AC (1) Hex Jam Lock Nut 3/8-16 Thread

(2) Tow Bar Halves (Not Shown)

FIGURE 3

NOZZLE (N)

FIGURE 4

UPPER
HANDLE (O)

Place nozzle (N) in position on front of housing

so that it rests in flanges. Secure with one hand

knob (F) and belleville washer (G). See figure 4.

2. Place the upper handle (O) in position over lower
handle. Fasten with four hex bolts (I) and lock
nuts (J) provided. See figure 5. Two 7/16"
wrenches are required.

FIGURE 5

3. Place the stud pins (K) in holes in upper handle
(head of pins go to the inside of handle). Secure
pins with push-on speed nuts (L) by holding
speed nut with box wrench and tapping pin with
hammer. See figure 6.

HAND
KNOB (F)

FIGURE 7

4. Place air duct assembly (P) over opening on top
of housing. Secure with two hand knobs (F) and
belleville washer (G). See figure 7.

FIGURES

STUD I IN
ON HAMDLE

BAG (T)

Assemble the bag by slipping the top straps on

5.
bag (T) over upper handle. Hook two small straps
over stud pins on handle. Slip elastic opening of
bag over air duct assembly. See figure 8.

NOTE

Be certain elastic on bag is placed over
the flanges on air duct assembly.

NOTE

Steps 6, 7, 8 and 9 are for self-propelled

units only.

FIGURES

Assemble the clutch grip (A) to the left hand

6.

side of upper handle. Secure in place with clevis
pin (C) and hair pin cotter (B). See figure 9. Head
of clevis pin should be to the outside of handle.

LOCK
NUT (E)

FIGURE 10

CLUTCH

BRACKET
ASSEMBLY

\

CLUTCH

ROD (Q)

EXTENSION
SPRING (D)

7. Slide the extension spring (D) onto clutch rod (Q)
as shown in figure 10. Thread lock nut (E) onto
clutch rod approximately 2-1/2 inches.

8.

Hook top (hooked end) of clutch rod into clutch
grip. Hook spring into clutch bracket assembly.
See figure 11. Spring should not have any slack.
Adjust nut so that when the clutch grip is all the
way up, there is no slack in the spring.

FIGURE 11

HAND
KNOB

9. Thread hex jam nut (M) onto clutch rod, and
lock it against the lock nut (E).

ASSEMBLY INSTRUCTIONS
To Convert from a Vacuum to a Leaf Blower.

Ac WARNING {

Engine must be stopped (off) and

spark plug wire disconnected.

1. Remove the bag.

2. Remove the air duct assembly by removing two
hand knobs and belleville washers.

FIGURE 12

3. Remove the nozzle by removing one hand knob
and belleville washer.

-4. Remove the hand knob and belleville washer
holding the housing to engine brace. See figure 12.

5. Lift up and out on the housing and rotate it 105°
clockwise. Chute opening should be to the righ"
hand side when viewed from the front of uni

See figure 13.

6. Place the impeller guard (S) into flanges on front
of housing. Line up hole in guard with hole on
housing. Secure with one hand knob, belleville
washer and heavy flat washer (H). See figure 13.

FIGURE 14

HEX
NUT (W)

SHOULDER
SPACERS(V)

FIGURE 15

HAND KNOB

TRUSS
MACHINE
SCREW (X),

BELLEVILLE

WASHER (AB)

SHOULDER'
BOLT (AA)

DIREOTIOr AL
DISCHARG =.
ASSEMBLY (R)

HEX JAM

LOCK NUr

(AC)

\ HIT( H

\ \ PLA "E

\ \

BELLEVILLE

WASHER (AB)

7. Place the directional discharge assembly (R) ovei
chute opening. Secure with two hand knobs and
belleville washers. See figure 14.

ASSEMBLY INSTRUCTIONS
for

Tow Bar Kit (Optional)

1.

Remove the self-tapping screws on each side of

frame. Refer to drawing on page 12, reference

number 42.

2.

Place tow bar half in position on frame. Place
one shoulder spacer (V) between frame and
tow bar. Next, place shoulder spacer (V) and hex
bolt (U) through tow bar and frame. Secure with
hex nut (W). See figure 15. Repeat for other side.

3. Secure the two tow bar ends together with truss
machine screws (X), lock washers (Y) and hex
nuts (Z). See figure 15.

To attach the tow bar to a hitch, place the shoulde”'
bolt (AA) up through the tow bar. Place one bellevilK
washer (AB) on the shoulder bolt, then the hitch
place and the other belleville washer. Cupped side of
the washers must be against the hitch plate. Secure
with hex jam lock nut (AC). See figure 15.

OPERATION

PRE-START PREPARATIONS

“^rvice engine with gas and oil. See engine manual

.:ked with vacuum for complete instructions for
care and maintenance of engine. READ DIREC
TIONS CAREFULLY.

A

CAUTION

REVOLVING BLADES-KEEP

HANDS AWAY FROM ALL
OPENINGS

TO START ENGINE
After the engine has been properly fueled and oiled

(refer to engine operating and maintenance instruc

tions), start engine following the instructions below.

1. Move throttle control lever on engine to START

position.

2. Crank engine. Pull recoil with quick firm pull.
^ Do not pull out so far the 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. Self Propelled Models Only - To engage the drive

mechanism, squeeze the clutch grip against the
upper handle. Release the clutch grip to stop the

forward motion.

ADJUSTMENTS

CAUTION

A

Do not at any time make any adjust
ment to the unit without first stopping
engine and disconnecting spark plug
wire.

HEIGHT ADJUSTMENT
The height adjustment crank is located on the right

hand side of the vacuum. See figure 17. Turn the crank
clockwise to raise the nozzle. Turn the crank counter
clockwise to lower.

TO STOP ENGINE

1. To stop engine, move throttle control lever to
STOP position.

2. Disconnect spark plug wire and ground to prevent
accidental starting while equipment is unattended.

Operate a new engine at intermediate speeds and light
load for the first few hours as you would a new

automotive engine.

IMPORTANT

The vacuum bag may have an air escape

located on the upper right hand side.
See figure 16. The air escape can be
opened if the vacuum is operated in
wet, sandy or muddy conditions.

FIGURE 17

CARBURETOR ADJUSTMENT

A

If any adjustments are made to the

engine while the engine is running

(e.g. carburetor), disengage all clutches.
Keep clear of all moving parts. Be
careful of heated surfaces and muffler.

If carburetor needs adjustment to start or for oper

ation, see "Carburetor Adjustment" section of encine

manual.

CLUTCH ROD ADJUSTMENT (Self Propelled Models
Only)

To adjust the clutch rod, refer to step numbers 8 and

9 under assembly instructions.

WARNING

LUBRICATION

Wheels - Rear wheels are provided with oil ite

bearings. Place a few drops of SAE 30 oil on each
bearing once a season.

Gear Box (Self Propelled Models Only) - The gear box

lubricated with 2 ounces of High Temp. (450° F.)
grease. Order part number 737-0133. Periodically
check lubricant level by removing the two self-tap )ing
screws on the gear box cover and lifting off the
cover. Do not change grease; simply add if necessary.

MAINTENANCE

A

Disconnect spark plug wire and ground
it against the engine before performing
any repairs or maintenance.

BELT REPLACEMENT (Self Propelled Models O ily)

1. Remove the nozzle or impeller guard from f ont
of blower housing.

2. Remove hex bolt and lock washer from cent( r of
impeller. See figure 18. A 9/16" socket wn nch

with extension is needed.

3. Remove hand knob and belleville washer from
top of housing.

4. Remove two self-tapping screws which hold the
belt guard. See figure 19. A 3/8" wrenci is
required. Lift off belt guard.

\ WARNING }

FIGURE 19

5. Slide belt off the impeller pulley. Slide housing
and impeller off engine crankshaft. Be careful
to not lose square key. See figure 20.

ENGINE

CRANKSHAFT

P.T.O.
PULLEY

FIGURE

10

6. Slide impeller and blower housing assemblies off
crankshaft.

OFF-SEASON STORAGE

7. Remove belt from P.T.O. pulley and install new
belt. See figure 20.

NOTE

When reassembling the new belt, the
aid of another person will be helpful.

8. Turn the crankshaft until the key way on shaft is
directly on top. While holding housing assembly
and impeller assembly, line up the key way on the
pulley with the key on the crankshaft, and slide
housing and impeller assemblies onto crankshaft.

9. Secure impeller to crankshaft with hex bolt and

lockwasher, removed in step 2. Tighten securely.

10. Slip belt over impeller pulley and reassemble the
belt guard.

11. Secure blower housing with hand knob and
washer.

12. Reassemble the nozzle or impeller guard.

The following steps should be taken to prepare the
unit for storage.

1. Clean the engine and the entire unit thoroughly.

2. Refer to engine manual for correct engine storage
instructions.

3. Store unit in a clean, dry area.

NOTE

When storing any type of power
equipment in an unventilated or metal
storage shed, care should be taken to
rustproof the equipment. Using a light
oil or silicone, coat the equipment,
especially springs and bearings.

PROBLEM CAUSE

1. Excessive

vibration.

2. Height adjust

ment slips out
of lockout
position.

3. Engine fails

to start.

4. Hard starting

or loss of power.

5. Engine over
heats.

A. Bent crankshaft.

B. Vane plate out of balance.

Handle bent.

A. Check fuel tank for gas.
B. Spark plug lead wire

disconnected.

C. Faulty spark plug.

A. Spark plug wire loose.
B. Dirty air cleaner.

A. Carburetor not adjusted

properly.

B. Air flow restricted.

C. Engine oil level low.

TROUBLE SHOOTING CHART

REMEDY

A. Replace crankshaft (should be done by an authorized service

dealer).

B. Replace vane plate.

Replace index handle and index plate.

A. Fill tank if empty.
B. Connect lead wire.

C. Spark should jump gap between control electrode and side

electrode. If spark does not jump, replace the spark plug.

A. Connect and tighten spark plug wire.
B. Clean air cleaner as described in engine manual.

A. Adjust carburetor. See engine manual.

B. Remove blower housing on engine and clean as described in the

engine manual.

C. Fill crankcase with the proper oil.

.OTE: For repairs beyond the minor adjustments listed above, please contact your local service dealer.

11

Models 675, 685 and 689

“к

7?

12

675/685/689

PARTS LIST FOR MODELS 675, 685, 689, 24677 and 24687 POWER VACUUMS

F.

PART

NO.

1
2
3
4
5
6

COLOR

NO.

CODE

0577 B
711-0679
747-0154

Clevis Pin .375" Dia. x 1.88"t

Clutch Rod 32" Lg. T

DESCRIPTION

Clutch Grip Ass'y- t

749-0482 Handle Brace

Part of Engine

710-0892 Hex L-Wash. Hd. AB Tap Scr.

1/4" X .62" Lg. t

7 14558

714-0114

8
9 14536-488

Belt Guard t
Square Key 1/4" x 2.0" Lg.
Air Vane Plate Ass'y- (675 and 48 715-0247

677)

14557-488 Air Vane Plate Ass'y. w/pulley

710-0442

10
11 754-0219

Hex Bolt 5/16-18 X 1.5" Lg.*

"V"-Belt 1/2" X 26" Lg. t

12 736-0119 L.-Wash. 5/16" I.D. 51

712-0267

13

Hex Nut 5/16-18 Thd.*

14 16454, Engine Mounting Frame

Ass'y. N
15 714-0115 Cotter Pin 1/8" Dia. x 1.0" Lg.*
16

736-0187

Fl.-Wash. .63" I.D. x 1.25"

O.D.
17 736-0921

712-0206 Hex Nut 1/2-13 Thd.*

18

712-0107

19

L.-Wash. 1/2" I.D.*
Hex Cent. L.-Nut 1/4-20 Thd.

732-0411 Extension Spring .78" O.D.

X .75" Lg. t 57

Swivel Caster Wheel 5" Dia.

X 1.25" 59

Extension Spring .38" O.D.

X 7.50" Lg. t

22
23

734-1036
732-0409
716-0104 Snap "E"-Ring .50" Dia.

Shaft t 64

24 756-0367 "V"-Pulley 5/8" X 6.50" O.D.t 66
25
26 14570
27

748-0142 Flange Bearing .502" I.D. t

Gear Box Mounting Bracket t 69

732-0376 Extension Spring .75" O.D.x

3.28" Lg. t 71

28 14565

Clutch Bracket Ass'y. T 72

29 714-0229 #2 Woodruff Key 3/32" Dia.

X .81" Lg. t 73 750-0142

30

748-0227 Hex Flange Bearing Bronze

.625" I.D. t 74
31 738-0516 Pinion Shaft .50" Dia. x 5.0"t
32
33
34

717-0493 Gear Box Ass'y. Comp, t

16273 Caster Arm Ass'y. N

08348

Drive Shaft .624" Dia. x

22.75" Lg. t 77

35 748-0136

Bevel Gear .50" I.D. x 14

Teeth
36 748-0108
37 08189

748-0110 Flange Bearing .630" I.D. t

38

1

08187 Gear Box Cover t

Flange Bearing .503" I.D. t

Gear Box t

J

REF.

NEW

PART

NO.

40
41
42
46
47

49
50

53

54

55
58 736-0117 Fl.-Wash. 138" I.D. x .62" O.D.

61
62
63

67
70

75 710-0352
76 14556

78
79
80

81 21989
82
83 736-0169

PART

NO.

COLOR

CODE

DESCRIPTION

748-0135 Bevel Gear .62" I.D. x 28

Teeth t

715-0246 Spring Pin Spiral 3/16" Dia.

X 1.25" Lg. t

710-0726 Hex Wash. Hd. "AB" Tap Scr.

5/16" X .75" Lg.

748-0201 Spacer .63 I.D. x .88" O.D.

X .56" Lg. t

14530-488 Side Plate

Spring Pin Spiral 3/16" Dia.

X 1.0" Lg. t

748-0288 Drive Pinion t

710-0170 Hex Locking Bolt 5/16-24

X .62" Lg.

736-0159

Fl.-Wash. .34" I.D. x 87" O.D.

734-1035 Wheel Ass'y. - Comp. 12" x 3"

(Inch Ball Bearings)

734-1184

Wheel Ass'y. Comp. 10.5"

x4" (677 Only)
741-0313
750-0194

Bearings (677 Only)
Spacer .63" I.D. x 1.00" O.D.

x .94" Lg. (675,685,687)

748-0192

Spacer .63" I.D. x .878" O.D.

X .79" Lg. (677)

710-0118 Hex Bolt 5/16-18 X .75" Lg.*
747-0665 Height Adjustment Crank

720-0171 Crank Knob
710-0136 Hex Bolt 1/4-20 X 1.75" Lg.
764-0162

1539-019

Vacuum Bag - Felt

Push Speed Nut .25" Dia. Stud
749-0481 Lower Handle
726-0100 Push Nut 3/8" Dia.
711-0737 Stud Pin .250" Dia. x 1.75"
714-0145 Internal Cotter Pin 3/8" Dia.
749-0480
738-0185
715-0249

Upper Handle

Rear Axle .624" Dia. x 24.37"

Spring Roll Pin 5/32" Dia.

X 1.12 t

Spacer .82" I.D. x 1.00" O.D.

X .305 Lg. t

736-0175 L.-Wash. .265" I.D. t

Hex Self Tap Scr. 1/4" x 3/8"

Lg. t

R.H. Pinion Guard t

14555 L.H. Pinion Guard (Not Shown
712-0298 Hex Jam Nut 1/4-20 Thd. t
736-0242 Belleville Washer
736-0300

Fl.-Wash. .35" I.D. x .87" O.D.

750-0528 Spacer .38" I.D. x .50" O.D. x

.180" Lg.

Ferrule 3/8-16 x .38" Dia.

712-0798 Hex Nut 3/8-16 Thd.*

L.-Wash. 3/8" I.D.*

NEW

PART

N

tParts for Self-Propelled Units (Models 685,689, and 24687) only.

13

Models 675, 685 and 689

14

Models 675, 685 and 689

PARTS LIST FOR MODELS 675,685,689, 24677 and 24687 POWER VACUUMS

Ref.
No.

1
2
3
4
5
8 14479
9

10
11 712-0267
12 736-0119
13
14
15

16
17 14541 Right Angle Bracket
18 710-0600

19
20
21
22 710-0627
23
24
25 14569 Wiper Retaining Strip
26

28 710-0602
29 710-0255
30
31
32

34
35 736-0219 Belleville Wash. .39 I.D. x 1.12 O.D. t
36

Part

No.

14532 -

736-0242
720-0170
749-0501

Color

Code

488

Description

Air Duct Assembly
Belleville Wash. 34" I.D. x .87" O.D.
3-Arm Thumb Scr. 5/16-18 x .75" Lg.
Tow Bar Half

731-0608 Impeller Guard

Directional Discharge Ass'y.
14562 Nozzle Ass'y.
14563 Nozzle Plate Ass'y.

Hex Nut 5/16-18 Thd.*

L.-Wash. 5/16" I.D.

710-0191

736-0217
14536 ­14557 -

488
488

Hex Bolt 3/8-24 x 1.25" Lg.*

L.-Wash. 3/8" I.D. H.D.
Air Vane Plate Ass'y. (675 and 24677)
Air Vane Plate Ass'y. w/pulley (685, 689 and

24687)

14496 -

488 Blower Housing Complete

Hex Self-Tap Scr. 5/16-18 x .50" Lg.

736-0231
711-0758

Fl.-Wash. 5/16" I.D.
Hex Shoulder Nut .50 I.D.

710-0260 Carriage Bolt 5/16-18 x .62" Lg.*

Hex Locking Bolt 5/16-24 x .75" Lg.

14539 Housing - Engine Brace Ass'y.
728-0173

Pop Rivet (5-Required)

735-0214 Nozzle Wiper

Hex Bolt 5/16-18 X 1.00" Lg.* t

Truss Mach. Scr. 1/4-20 x .75" Lg.*'*'

712-0287

Hex Nut 1/4-20 Thd.*t

736-0329 L. Wash. 1/4" I.D.*t
748-0234 Shoulder Spacer t
738-0143 Shid. Bolt .496 Dia. t

712^0181 Hex Jam L-Nut 3/8-16 Thd.t

New
Part

tOptional Parts

*For faster service obtain standard nuts, bolts and washers
locally. If these items cannot be obtained locally, order by
part number and size as shown on parts list.

(488 - Mack Truck Yellow)
(615 - Red)

When ordering parts, if color or finish is important use the
appropriate color code shown above, (e.g. Mack Truck
Yellow Finish - 14542 (488).

This instruction manual covers various
models and all specifications shown do not
necessarily apply to your model. Specifica
tions subject to change without notice or

obligation.

NOTE

15

NOTE: The engine is not under warranty by
the vacuum manufacturer... If repairs or
service is needed on the engine, please
contact your nearest author
ized engine service outlet.
Check the "Yellow Pages" of
your telephone book under
"Engines—Gasoline.”

Find It Fast

In The

Yellow Pages

MTD PRODUCTS INC

..................................................

P.O. BOX 3690(1 • CLEVELAND OHIO 44136

YaRD-MaN COMPANY