MTD Lawn Mower Parts Diagrams and Manual

Model Series 660 & 670

This section details parts for the MTD Model Series 660 & 670. The diagram shows an exploded view of the front hood, grille, and associated components.

Parts List
Ref. No.	Part No.	Description
1.	629-0469A	Harness Assembly
2.	710-0642	Hex TT-Tap Scr. 1/4-20 x .75" Lg.
3.	710-0751	Hex Bolt 1/4-20 x .62" Lg.
4.	710-3008	Hex Bolt 5/16-18 x .75" Lg.
5.	712-0185	Speed Nut 1/4-20 Thd.
6.	712-3004A	Flange L-Nut 5/16-18 Thd.
7.	712-3006	Hex Nut 1/4-20 Thd.
8.	712-3027	Hex Flange L-Nut 1/4-20 Thd.
9.	725-1649	Socket
10.	725-0963	Lamp (Not Shown)
11.	731-1097E	Grille
12.	731-1099A	Lens
13.	736-0329	L-Wash. 1/4" I.D
14.	736-0342	Fl-Wash..293" I.D. x .75" O.D.
15.	736-3078	Fl-Wash. .349" I.D. x .063" O.D.
16.	738-0952A	Shldr Screw.375" I.D. x.125" O.D.
17.	749-0812	Grille Support
18.	783-0250	Hood

Model Series 663 and 673

This section details parts for the MTD Model Series 663 and 673. The diagram shows an exploded view of the hood, grille, and side panel assembly.

Parts List
Ref. No.	Part No.	Description
1.	629-0469A	Harness Assembly
2.	710-0473	Truss. Mach. Scr. #10-24 x 5" Lg.
3.	710-0642	Hex TT-Tap Scr. 1/4-20 x .75" Lg.
4.	710-0924	Pan Hd. Scr. 1/4-20 x .75" Lg.
5.	710-3008	Hex Bolt 5/16-18 x .75" Lg.
6.	712-0185	Speed Nut 1/4-20 Thd.
7.	712-0272	Hex Sems Nut 1-24 Thd.
8.	712-3004A	Flange L-Nut 5/16-18 Thd.
9.	712-3006	Hex Nut 1/4-20 Thd.
10.	712-3027	Flange L-Nut 1/4-20 Thd.
11.	725-1651	Socket
12.	725-0963	Lamp (Not Shown)
13.	731-1503A	Lens
14.	732-0835	Hood Latch
15.	736-0270	Bell-Wash. .265" I.D. x .75" O.D.
16.	736-3078	Fl-Wash. .349" I.D. x 1.0" O.D.
17.	738-0952A	Shd. Scr. .375" I.D. x 1.25" O.D.
18.	783-0150A	R.H. Side Panel
19.	783-0151A	L.H. Side Panel
20.	783-0156A	Grille
21.	783-0250	Hood

Model Series 665 & 675

This section details parts for the MTD Model Series 665 & 675. The diagram shows an exploded view of the hood, grille, and side panel assembly.

Parts List
Ref. No.	Part No.	Description
1.	629-0469A	Harness Assembly
2.	710-0473	Truss Mach. Scr. #10-24 x .5"
3.	710-0642	Hex TT-Tap Scr. 1/4-20 x .75" Lg.
4.	710-0924	Pan Hd. Scr. 1/4-20 x .75” Lg.
5.	710-3008	Hex Bolt 5/16-18 x .75" Lg.
6.	712-0185	Speed Nut 1/4-20 Thd.
7.	712-0272	Hex Sems Nut #10-24 Thd.
8.	712-3004A	Flange L-Nut 5/16-18 Thd.
9.	712-3006	Hex Sems Nut 1/4-20 Thd.
10.	712-3027	Hex Flange L-Nut 1/4-20 Thd.
11.	725-1649	Socket
12.	725-0963	Lamp (Not Shown)
13.	731-1097E	Grill
14.	731-1099A	Lens
15.	732-0835	Hood Latch
16.	736-0270	Bell-Wash. 1/4" I.D.
17.	736-3078	Fl-Wash..34" I.D. x 1" O.D.
18.	738-0952A	Shld. Bolt .375"Dia. x .125" Lg.
19.	783-0150A	R.H. Side Panel
20.	783-0151A	L.H. SIde Panel
21.	783-0250	Hood

Model Series 678

This section details parts for the MTD Model Series 678. The diagram shows an exploded view of the hood, grille, and side panel assembly.

Parts List
Ref. No.	Part No.	Description
1.	629-0469A	Harness Assembly
2.	683-0195	Bracket Assembly
3.	710-0456	Hex Wash. Tap Screw #10-16 Thd.
4.	710-0599	Hex Wash. TT-Tap Scr. 1/4-20 Lg.
5.	710-0751	Hex Bolt 1/4-20 x .62" Lg.
6.	710-0896	Hex Wash. Scr. 1/4-14 x .625" Lg.
7.	710-0924	Pan Hd. Mach. Scr. 1/4-20 x .75" Lg.
8.	710-1760	Torx Scr. #10-16 x .5" Lg.
9.	710-3008	Hex Bolt 5/16-18 x .75" Lg.
10.	712-0271	Hex Nut 1/4-20 Thd.
11.	712-0292	Tinn Nut 1/4-20 Thd.
12.	712-0431	Flange L-Nut 3/8-16 Thd.
13.	712-3004A	Flange L-Nut 5/16-18 Thd.
14.	725-1649	Socket
15.	725-0963	Lamp (Not Shown)
16.	731-1854A	Lens
17.	735-0126	Rubber Wash.
18.	735-0199A	Rubber Bumper
19.	736-0105	Bell-Wash. .375" I.D. x .870" O.D.
20.	736-3039	Fl-Wash. .406" I.D. x 1.5" O.D.
21.	736-3078	Fl-Wash. .349" I.D. x 1.0" O.D.
22.	783-0475A	L.H. Side Panel
23.	783-0476B	R.H. Side Panel
24.	783-0477A	Grill
25.	783-0478A	Hood
26.	783-0553A	Hood Support Bracket
27.	783-1038C	L.H. Hinge Hood Bracket
28.	783-1495	R.H.Hinge Hood Bracket

Model Series 679

This section details parts for the MTD Model Series 679. The diagram shows an exploded view of the hood, grille, and side panel assembly.

Parts List
Ref. No.	Part No.	Description
1.	16725	R.H. Side Panel
2.	16903A	Hood Plate
3.	17309B	L.H. Side Panel
4.	17410A	Grill
5.	629-0469A	Headlight Harness Assembly
6.	710-0166	Pan Hd. Scr. 1/4-20 x 1" Lg.
7.	710-0599	Hex Wash. Hd.Tap Scr. 1/4-20 x 5"
8.	710-0642	Hex Tap Scr. 1/4-20 x .75" Lg.
9.	710-0924	Pan Hd. Scr. 1/4-20 x .75" Lg.
10.	710-1005	Hex Wash. Hd. Scr. 1/4-20 x .5"
11.	710-1026	Hex Wash. TT-Tap Scr. 1/4-20
12.	710-3008	Hex Bolt 5/16-18 x .75" Lg.
13.	712-0429	Hex L-Nut 5/16-18 Thd.
14.	712-3004A	Flange L-Nut 5/16-18 Thd.
15.	712-3006	Hex Nut 1/4-20 THd.
16.	725-1650	Socket
17.	725-0963	Lamp (Not Shown)
18.	726-0201	Speed Nut
19.	731-0511	Trim Strip
20.	731-0705	Headlight Housing
21.	731-1044	Lens
22.	731-1704A	Hood-Evergreen
23.	731-1893A	Hood-Black
24.	731-1491A	Hood-Red
25.	731-1492	Hood-Midnight Blue
26.	731-1497A	Hood-Gray
27.	735-0126	Rubber Washer
28.	735-0242	Bellville Washer
29.	736-0270	Bell-Wash. .265" I.D. x .75" O.D.
30.	736-0329	L-Wash. 1/4" I.D.
31.	736-3010	Fl-Wash. .407" I.D. x 812" O.D.
32.	736-3078	Fl-Wash. .349" I.D. x .063" O.D.
33.	750-0218	Spacer .255" I.D. x .340" O.D.
34.	750-0768	Split Spacer .250" I.D. x .37" O.D.
35.	783-0190	Hood Hinge

Model Series 660 Thru 679 - Chassis and Steering Components

This section details parts for the MTD Model Series 660 Thru 679, focusing on the chassis, steering column, and front axle components. The diagram shows an exploded view of these assemblies.

Parts List
Ref. No.	Part No.	Description
1.	17198A	Retainer Plate
2.	16481A	Steering Arm Front Axle
3.	683-0128A	Pivot Bar Ass'y (Steel)
4.	719-0342B	Pivot Bar Ass'y (Cast Iron)
5.	**	Grease Fitting (Cast Iron)
6.	710-0459A	Hex Bolt 3/8-24 x 1.5" Lg. (Gr. 5)
7.	710-0593	Hex Bolt 5/16-24 x 2.25" Lg.
8.	710-0643	Hex Bolt 5/16-18 x 1" Lg.
9.	710-0726	Hex Wash. Hd. Self-Tap Scr.
10.	710-1039	Hex Hd. Cap Scr. 3/8-24 x 1.0 Gr. 5
11.	710-1309	Hex Patch Bolt 5/16-18 x .62"
12.	747-1268A	Steering Drag Link
13.	712-0158	Hex Cent. L-Nut 5/16-18 Thd.
14.	712-0214	Hex Cent. L-Nut 3/8-24 Thd.
15.	712-0240	Jam Nut 7/16-20 Gr. 2
16.	712-0241	Hex Nut 3/8-24 Gr.5
17.	712-0262	Hex Jam Nut 3/8-24 Thd.
18.	712-0411	Hex L-Nut 5/16-24 Thd.
19.	712-0431	Flanged L-Nut 3/8-16 Thd.
20.	717-0622A	Steering Gear Segment
21.	723-0448A	Ball Joint 7/16-20 Thd.
22.	736-0169	L-Wash. 3.8" I.D.
23.	736-0187	Fl-Wash. (Hardened)
24.	736-0217	L-Wash.
25.	736-0242	Bell. Wash. .340 I.D. x .872 O.D.
26.	736-0356	Bell. Wash. .39 I.D. x 1.38 O.D.
27.	736-3081	Fl-Wash. .320 x .600 x 060
28.	738-0141	Shoulder Bolt .437 x .35 Lg.
29.	738-0527	Shoulder Bolt
30.	738-0919	Steering Shaft
31.	741-0656	Hex Flg. Brg. .634 I.D.
32.	741-0659	Hex Flg. Brg. .632 I.D.
33.	747-0861	Tie Rod (Non-Adjustable)
34.	747-1267	Tie Rod (Adjustable)
35.	748-0389	Cap
36.	750-0535	Spacer .380" I.D. x .625" O.D.
37.	783-0041B	Pivot Bar Bracket
38.	711-1661	Ferrule
39.	714-0470	Cotter Pin 1/8
40.	736-0267	Fl-Wash. 3/8 x .870 I.D. x .060 O.D.
41.	731-1649	Axle Cap
42.	731-1291A	Pivot Bar End Cap*
43.	714-0470	Cotter Pin
44.	736-0285	Fl-Wash. .635 I.D. x 1.589 O.D.
45.	736-0162	Fl-Wash. .641 I.D. x 1.0 O.D.
46.	**	Front Axle Assembly R.H.
47.	**	Front Axle Assembly L.H.
48.	726-0214	Push Cap
49.	731-0220	Steering Wheel Cap (Round)
50.	731-1460	Steering Wheel Cap (Sq. No Logo)
51.	731-1459A	Steering Wheel Cap (Sq. Logo)
52.	731-0954	Steering Bellow
53.	731-1687	Steering Wheel (3 Spoke) †
54.	631-0027	Steering Wheel (4 Spoke) ‡
55.	**	Wheel Assembly Comp.
56.	731-0484A	Front Wheel Hub Cap
57.	**	Front Wheel Rim Only

† Uses Square Steering Wheel Cap

‡ Uses Round Steering Wheel Cap

* If Equipped

Front Wheel Chart

Description	15" x 6" (Round Shoulder)	15" x 6" (Square Shoulder)
Wheel Ass'y Comp.	634-0056A	634-0105A
Tire Only	734-0864	734-1731
Rim Only	634-0172	634-0172
Bearing	741-0487A	741-0487A
Air Valve	734-0255	734-0255
Grease Fitting (Optional)	737-0211A	737-0211A
Grease Plug	737-0212A	737-0212A
Front Axle Ass'y-L.H.	683-0127	683-0127
Front Axle Ass'y-R.H.	683-0126	683-0126
Front Axle Ass'y-L.H. (46" Deck)	683-0125	683-0125
Front Axle Ass'y- R.H. (46" Deck)	683-0124	683-0124

Model Series 660 Thru 679 - Transmission Assembly

This section details parts for the MTD Model Series 660 Thru 679, focusing on the transmission assembly. The diagram shows an exploded view of the transmission components.

Parts List
Ref. No.	Part No.	Description
1.	611-0011	Shift Fork Assembly
2.	711-1109	Input Shaft
3.	716-0108	Retaining Ring
4.	717-1464	Pinion Input 14T
5.	736-0335	Needle Brg. 5/8" I.D. x 1" O.D.
6.	716-0231	"E" Ring
7.	719-0367	Upper Housing
8.	732-0614	Wire Ring
9.	**	Washer
10.	736-0349	Fl-Wash. 5/8" I.D. x 1" O.D. x .020 Thd.
11.	741-0335	Needle Brg. 5/8" I.D. x 1/2" Lg.
12.	711-1003	Drive Shaft - R.H. Brake
13.	717-1362	Bevel Gear 42T Small I.D.
14.	717-1363	Bevel Gear 42T Large I.D.
15.	718-0228	Clutch Collar
16.	**	Washer
17.	**	Washer
18.	736-0519	Thrust Washer
19.	741-0336	Flange Brg. 5/8" I.D. x 3/4" Lg.
20.	741-0337	Flange Brg. 5/8" I.D. x 15/16" Lg.
21.	618-0162	Differential Ass'y
22.	712-0273	Hex Nut 5/16-24 Thd.
23.	717-0678	Brake Puck
24.	717-0682	Puck Plate
25.	717-0700	Actuating Arm
26.	718-0150	Anti-Rotation Brkt.
27.	732-0742	R.H. Brake Spring
28.	736-0371	Fl-Wash. .344 I.D. x .875" O.D.
29.	741-0343	Actuating Pin 5/16" Dia.
30.	761-0198	Brake Yoke
31.	710-1206	Hex Wash. Hd. Self-Tap Scr. 1/4-20
32.	710-1325	Hex Tap Scr. 1/4-20 x 1.625" Lg.
33.	719-0313B	Lower Housing
34.	732-0863	Spring Detent
35.	741-0862	Ball Detent .250" DIa.
36.	761-0202	Brake Disc.
37.	737-0148	Grease-Shell (15 oz.)
38.	741-0340	Sleeve Bearing 3/4" I.D. 1.0" Lg.
39.	721-0338	Oil Sleeve 3/4" I.D.
40.	736-0445	Fl-Wash..760" I.D. x 1.5" O.D.
41.	736-0495	Thrust Wash. 5/8" I.D. x 1" O.D. x .025" Thk.
42.	736-0336	Fl-Wash. 5/8" I.D. x 1" O.D. x .030" Thk.
43.	736-0494	Thrust Wash. 5/8" I.D. x 1" O.D. x .035" Thk.
44.	736-0337	Fl-Wash. 5/8" I.D. x 1" O.D. x .040" Thk.
45.	736-0349	Fl-Wash. 5/8" I.D. x 1" O.D. x .020" Thk.
46.	736-0336	Fl-Wash. 5/8" I.D. x 1" O.D. x .030" Thk.
47.	736-0337	Fl-Wash. 5/8" I.D. x 1" O.D. x .040" Thk.
48.	736-0492	Fl-Wash. .76" I.D. x 1.5" O.D. x .010" Thk.
49.	736-0493	Fl-Wash. .76" I.D. x 1.5" O.D. x .020" Thk.
50.	736-0351	Fl-Wash. .76" I.D. x 1.5" O.D. x .030" Thk.
51.	736-0445	Fl-Wash. .76" I.D. x 1.5" O.D. x .060" Thk.

Model Series 660 Thru 679 - Drive System and Controls

This section details parts for the MTD Model Series 660 Thru 679, covering the drive system, steering, and control components. The diagrams show exploded views of these assemblies.

Parts List
Ref. No.	Part No.	Description
1.	17630	Shift Lever Bracket
2.	720-0232	Shift Knob
3.	710-0599	Self Tap. Screw 1/4-20 x .50 " Lg.
4.	17705	Shift Lever Assembly
5.	732-0525	Comp. Spring-Clip
6.	712-0241	Hex Nut 3/8-24 Thd.
7.	736-0105	Bell Wash. .375" I.D.
8.	710-0726	AB-Tap Scr. 5/16-18 x .75" Lg.
9.	710-0224	AB-Tap Scr. #10-16 x .5" Lg.
10.	17962	Switch Plate
11.	732-0750A	Switch Spring Actuator
12.	783-0310E	Lower Frame
13.	736-0119	L-Wash. 5/16" I.D.
14.	711-1044	Belt Guard Pin 4.75" Lg.
15.	750-0956	Spacer 1" I.D. x 1.25" Lg.
16.	756-0982B	Engine Pulley
17.	736-0322	Fl. Wash..450" I.D.
18.	736-0171	L-Wash. 7/16" I.D.
19.	710-3029	Hx Hd. Cap Scr. 7/16-20 x 1.25" Lg.
20.	17963	Bearing Shaft Bracket Ass'y
21.	738-0755	Shoulder Screw
22.	747-0530A	Speed Control Link
23.	16354B	Variable Speed Brkt. Ass'y
24.	741-0495	Flange Brg. 5/8" I.D. x .88" Lg.
25.	711-1000	Belt Keeper 3" Lg.
26.	717-0800A	Variable Speed Pulley Ass'y
27.	736-0355	Fl-Wash.
28.	741-0405	Thrust Bearing .56" I.D. x 1.25"
29.	736-0331	Bell Wash. .390" I.D. x 1.13"
30.	732-0568	Extension Spring
31.	741-0419	Flange Bearing
32.	16554A	Variable Speed Torque Brkt. Ass'y
33.	736-0275	Fl-Wash. .344" I.D.
34.	714-0111	Cotter Pin
35.	710-0604A	TT-Tap Scr. 5/16-18 x .625" Lg.
36.	710-0539	Hex Hd. Cap Scr. 3/8-24 x 1.75" Lg.
37.	754-0370	V-Belt
38.	716-0114	Snap Ring. 56" Dia.
39.	736-0414	Fl-Wash. .570" I.D. x .120" Lg.
40.	738-0569	Shaft .56" Dia. x 3.79" Lg.
41.	714-0209	Internal Cotter Pin
42.	735-0196	Foot Pad
43.	710-1238	TT-Tap Scr. 5/16-18 x .75"
44.	712-0265	Sems Nut 5/16-18
45.	714-0470	Cotter Pin 1/8-1.25
46.	736-0140	Fl-Wash.385" I.D. x .62" O.D.
47.	711-0198	Ferrule
48.	750-0802	Spacer
49.	736-0256	Fl-Wash. .635" I.D. x .930 O.D.
50.	17860	Pedal Bracket
51.	747-0755A	Brake Rod
52.	710-0189	Hex Hd. Cap Scr. 5/16-18
53.	710-1266	Hex Bolt 5/16-18 x 3.5" ( Used w/ 46" Deck Ass'y)
54.	732-0413	Ext. Spring
55.	732-0642	Ext. Spring (Used w/ 46" Deck)
56.	17707	Shift Link Assembly
57.	736-0270	Bell Wash. .265 x .75
58.	710-0195	Hex Hd. Cap Screw 1/4-28
59.	712-3004A	Flange L-Nut 5/16-18 Thd.
60.	712-0138	Hex Nut 1/4-28 Thd.
61.	736-0329	L-Wash. 1/4" I.D.
62.	710-0428	Hex Hd. Cap Screw 1/4-28
63.	732-0384	Extension Spring
64.	710-3008	Hex Hd. Cap Screw 5/16-18
65.	748-0234	Shoulder Spacer
66.	17643	Idler Brkt.
67.	17694	Idler Brkt. (Used w/ 46" Deck)
68.	736-0169	L-Wash. 3/8" I.D.
69.	756-0643A	Flat Idler Pulley
70.	756-0665	V Pulley
71.	712-0700	Flange Nut 9/16
72.	712-3010	Hex Nut 5/16-18 Thd.
73.	17668	Axle Support Brkt. R.H.
74.	17669	Axle Support Brkt. L.H.
75.	17840	Transaxle Mounting Brkt.
76.	712-3006	Hex Nut 1/4-20 Thd.
77.	17629A	Transaxle Support Brkt.
78.	732-0556	Ext. Spring
79.	754-0280A	V-Belt
80.	**	Rear Wheel Assembly Comp.
81.	**	Rear Wheel Rim Assembly
82.	736-0242	Bell Wash. .340 I.D. x .872 O.D.
83.	710-0627	Hex Hd. Cap Scr. 5/16-24
84.	734-0255	Air Valve (Service Only)
85.	683-0123	Clutch Brake Pedal Ass'y
86.	718-0758	Pulley Hub Splined
87.	748-0334	Spacer (Used w/46" Deck)

Model Series 660 Thru 679 - Deck Assemblies

This section details parts for various deck sizes for MTD Model Series 660 Thru 679, including 38" Deck "F", 42" Deck "G", and 46" Deck "H". The diagrams show exploded views of the deck assemblies and their components.

38" Deck "F"

Diagram shows an exploded view of the 38" deck assembly, including blade spindle, belt guard, chute, and pulleys. Includes important notes on V-belt usage.

Parts List
Ref. No.	Part No.	Description
1.	16606	Retainer Hook Brkt.
2.	683-0138A	Blade Spdl Ass'y
3.	683-0129A	Deck Assembly**
4.	753-0694	38" Deck Ass'y Comp. (For Service)**
5.	710-0134	Carriage Screw 1/4-20 Thd. Gr.2
6.	710-0599	Hex Wash. Hd. TT-Tap Scr. 1/4-20 Thd.
7.	710-0751	Hex Bolt 1/4-20 x .62" Lg.
8.	710-1260A	Hex Wash. TT-Tap Scr. 5/16-18 x .75"
9.	712-0181	Hex Top L-Nut 3/8-16 Thd.
10.	712-0417A	Hex Flange Nut 5/8-16 Thd. ‡
11.	712-3027	Hex Flange Nut 1/4-20 Thd.
12.	712-3087	Wing Nut 1/4-20 †
13.	731-2363	Mulch Plug †
14.	734-0973	Deck Wheel
15.	736-0105	Bell-Wash..40" I.D. x .88" O.D.
16.	736-0270	Bell-Wash. 1/4" I.D. †
17.	738-0373	Shoulder Screw
18.	742-0610	3 in 1 blade
19.	742-0654	2 in 1 blade (For bagging and side dischrg)
20.	754-0329A	V Belt
21.	783-0343A	Belt Guard
22.	783-1297	Deck Skirt
23.	731-1032B	Chute Ass'y (Incl. Ref. 24,25,26, 27)
24.	731-1031B	Chute Deflector
25.	726-0233	Push Nut
26.	712-3006	Hex Nut 1/4-20 Gr. 5
27.	703-1693A	Hinge Mounting Brkt.
28.	711-0792	Hinge Pin
29.	726-0106	Speed Nut Cap
30.	732-0602A	Torsion Spring
31.	783-0342	Brake Disc
32.	756-1187	5" Dia. Pulley ‡

† Optional

‡ Deck pulley and blade nuts must be torqued to 100 ft. lbs. if removed or replaced.

** Must be ordered with 4 digit color code.

42" Deck "G"

Diagram shows an exploded view of the 42" deck assembly, similar components to the 38" deck. Includes important notes on V-belt usage.

Parts List
Ref. No.	Part No.	Description
1.	16606	Retainer Hook Brkt.
2.	618-0142A	Blade Spindle Ass'y
3.	683-0141B	42" Deck Assembly**
4.	753-0698	42" Deck Ass'y Comp. (For Service)**
5.	710-0134	Carriage Bolt 1/4-20 Lg.
6.	710-0599	Hex Wash. Hd. TT-Tap Screw 1/4-20 Thd.
7.	710-0751	Hex Bolt 1/4-20 x .62"
8.	710-1260A	Hex Wash. TT-Tap Scr. 5/16-18 x .75"
9.	712-0181	Jam Nut 3/8-16
10.	712-0417A	Hex Flange Nut 5/8-18 Thd. ‡
11.	712-3027	Hex Flange Nut 1/4-20 Thd.
12.	712-3087	Wing Nut 1/4-20 †
13.	731-2363	Mulch Plug †
14.	734-0973	Deck Wheel-5"
15.	736-0105	Bell-Wash..40" I.D. x .88" O.D.
16.	736-0270	Bell-Wash. 1/4 I.D. †
17.	738-0373	Shoulder Screw
18.	742-0616	3 in 1 blade
19.	742-0656	2 in 1 blade (For bagging and side dischrg)
20.	754-0371A	V Belt
21.	783-0149B	Belt Guard
22.	783-1146A	Deck Skirt
23.	731-1032B	Chute Ass'y (Incl. Ref. 23,24,25,26)
24.	731-1031B	Chute Deflector
25.	783-0342	Brake Disc.
26.	703-1693A	Hinge Mounting Brkt.
27.	711-0792	Hinge Pin
28.	726-0106	Speed Nut Cap
29.	732-0602A	Torsion Spring

† Optional

‡ Deck pulley and blade nuts must be torqued to 100 ft. lbs. if removed or replaced.

** Must be ordered with 4 digit color code.

46" Deck "H"

Diagram shows an exploded view of the 46" deck assembly, including blades, pulleys, belts, and deck skirt. Includes important notes on V-belt usage.

Parts List
Ref. No.	Part No.	Description
1.	16606	Retainer Hook Brkt.
2.	17116	Deck Deck Brake Brkt Ass'y
3.	17258C	Belt Cover
4.	618-0240A	Spindle Ass'y
5.	983-0120A	46" Deck Ass'y**
6.	913-06921	46" Deck Ass'y Comp. (For Svc.)**
7.	710-0151	Hex Bolt 3/8-24 x 2" Lg.
8.	710-0167	Carriage Bolt 1/4-20 x .5" Lg.
9.	710-0428	Hex Bolt 1/4-28 x 1.25" Lg.
10.	710-0459A	Hex Bolt 3/8-24 x 2" Lg.
11.	710-0599	Hex Wash. Hd. TT-Tap Scr.
12.	710-0751	Hex Bolt 1/4-20 x .62" Lg.
13.	710-1039	Hex Bolt 3/8-24 x 1" Lg.
14.	710-1260A	Hex Flange Bolt 5/16-24 x .75"
15.	710-3151	Hex Bolt 5/8-18 x 4.25" Lg.
16.	711-0993	Belt Guard Pin
17.	712-0138	Hex Nut 1/4-28 Thd.
18.	712-0158	Hex Center L-Nut 5/16-18
19.	712-0181	Hex Top Jam Nut 3/8-16 Thd.
20.	712-0241	Hex Nut 3/8-24 Gr. 5
21.	712-0271	Hex Sems Nut 1/4-20
22.	712-0337	Hex Nut 5/8-18 Gr.5
23.	712-0417A	Hex Flange L-Nut 5/8-18 Thd.
24.	712-0429	Hex Ins. L-Nut 5/16-18 Thd.
25.	712-3006	Hex Nut 1/4-20 Gr.5
26.	712-3027	Hex Lock Nut 1/4-20
27.	716-3020	Internal Snap Ring
28.	731-1490	Slide Cap
29.	732-0594A	Ext. Spring .88" O.D. x 6.17”
30.	732-0723	Ext. Spring .788" O.D. x 15.5"
31.	734-0973	Deck Wheel-5"
32.	736-0105	Bell-Wash 3/8" x .87" x .064"
33.	736-0158	L-Wash. 5/8" I.D.
34.	736-0290	Fl-Wash..635" I.D. x 1" O.D.
35.	736-0329	L-Wash. 1/4" I.D.
36.	736-0331	Bell-Wash. 3/8" x 1.125" x .062"
37.	736-3088	Fl-Wash..635" I.D.
38.	738-0347	Shoulder Spacer .625" I.D.
39.	738-0373	Shld. Bolt .498" x 1.525"
40.	741-0524	Ball Brg. .625" I.D. x 1.574" O.D.
41.	742-0644	Blade 16.28" Lg. (L.H. & R.H.)
42.	742-0645	Blade 14.88" Lg. (Middle)
43.	748-0234	Shoulder Spacer
44.	750-0932A	Spacer .635" I.D. x .088" O.D.
45.	750-0960	Spacer .635" I.D. x 1" O.D.
46.	754-0439	V Belt
47.	754-0440	V Belt
48.	756-0627B	Idler Pulley
49.	756-0638	Pulley Double Deck
50.	783-0046	Idler Deck Bracket
51.	783-0063A	Belt Cover L.H.
52.	783-0141	46 " Deck Skirt Center
53.	783-0142	46" Deck Skirt R.H.
54.	703-1693A	Hinge Brkt.
55.	711-0792	Hinge Pin
56.	731-1032B	Chute Ass'y Comp.
57.	731-1031B	Chute Deflector
58.	732-0602A	Torsion Spring
59.	736-0270	Bell. Wash. .265 x.75
60.	726-0106	Speed Nut Cap
61.	738-0999	Return Spring Stud
62.	726-0233	Push Nut

Model Series 660 Thru 679 - Speed Selector and Controls

This section details parts for the MTD Model Series 660 Thru 679, focusing on the speed selector lever and related components. The diagrams show exploded views of these assemblies.

Parts List
Ref. No.	Part No.	Description
1.	17888A	Speed Selector Lever
2.	17956	Shift Lever Support
3.	710-3056	Hex Bolt 5/16-18 x 3.25" Lg.
4.	711-0198	Ferrule 3/8-24 Thd.
5.	712-3010	Hex Nut 5/16-18 Thd.*
6.	714-0111	Cotter Pin 3/32" Dia. x 1"
7.	726-0201	Speed Nut 5/16-18 Thd.*
8.	732-0645	Compression Spring
9.	736-0119	L-Wash. 5/16" I.D.*
10.	736-0159	Fl-Wash..345" I.D. x .88"
11.	736-0253	Bell-Wash. .505" I.D. x 1"
12.	736-0300	Fl-Wash. .385" I.D. x .87"
13.	736-0418A	Fl-Wash. .34" I.D. x 2.25"
14.	736-3024	Fl-Wash. .469" I.D. x .75"
15.	747-0787	Speed Control Rod
16.	750-0662	Spacer 1.56" Lg.
17.	750-0913	Spacer 1.46" Lg.
18.	720-0232	Shift Knob

Speed Selector Lever Assembly Parts
Ref. No.	Part No.	Description
1.	16192A	Speed Selector Lever Ass'y
2.	16194A	7-Speed Selector Plate
3.	710-0924	Truss Mach. Scr. 1/4-20 x .75" Lg.
4.	711-1098	Ferrule 3/8-24 Thd.
5.	712-3006	Hex Nut 1/4-20 Thd. (Gr. 5)
6.	712-3010	Hex Nut 5/16-18 Thd. (Gr. 5)
7.	714-0111	Cotter Pin 3/32" Dia. x 1.0"
8.	732-0303	Spring .38" O.D. x 3.18" Lg.
9.	736-0119	L-Wash. 5/16" I.D.
10.	736-0192	Fl-Wash. .53" I.D. x .93"
11.	736-0226	Fl-Wash. .469" I.D. x .88"
12.	736-0300	Fl-Wash. .385" I.D. x 7/8"
13.	736-0329	L-Wash.1/4" I.D.*
14.	738-0155	Shoulder Bolt
15.	747-0503A	Speed Control Rod
16.	720-0218	Shift Knob

Model Series 660 Thru 679 - Engine Components

This section details engine parts for various engine types used in MTD Model Series 660 Thru 679, including Over Head Valve, Twin Cylinder, Single Cylinder (Briggs & Stratton), Tecumseh, Kohler, and Intek Twin engines. Diagrams show exploded views of engine components.

Over Head Valve Engine

Parts List
Ref. No.	Part No.	Description
1.	710-0148	Hex Tap Scr. #8-32 x .38" Lg.
2.	710-0599	Hex TT-Tap Scr. 1/4-20 x .5" Lg.
3.	710-0604A	Hex TT-Tap Scr. 5/16-18 x .62"
4.	710-1237	Hex Wash. Scr. #10-32 x .62"
5.	710-1314	Socket Head Scr. 5/16-18 x .62"
6.	710-1315	Hex TT-Tap Scr. 3.8-16 x 1.25"
7.	712-0271	Hex Sems Scr. 1/4-20
8.	721-0208	Gasket
9.	726-0205	Hose Clamp
10.	726-0272	Clamp
11.	731-1682A	Oil Drain Sleeve
12.	736-0119	Lock Washer 5/16 I.D.
13.	751B213146	Casing Clamp
14.	751-0535-12	Fuel Line
15.	751-0564	Muffler Deflector
16.	751-0617	Muffler
17.	751-0619	Exhaust Pipe
18.	783-0615B	Muffler Brkt.

Twin Cylinder Engine

Parts List
Ref. No.	Part No.	Description
1.	710-0148	Hex Tap Scr. #8-32 x .38" Lg.
2.	710-0599	Hex Wash. TT-Tap Scr. 1/4-20 x 5" Lg.
3.	710-0604A	Hex Wash. TT-Tap Scr. 5/16-18 x .62" Lg.
4.	710-1268	Hex Hd. Tap Screw
5.	710-1315	Hex Hd. Tap Scr. 3.8-16 x 1.25" Lg.
6.	710-3015	Hex Bolt 1/4-20 x /75" Lg.
7.	712-0271	Hex Sems Nut 1/4-20 Thd.
8.	721-0346	Exhaust Gasket
9.	726-0205	Hose Clamp
10.	726-0272	Clamp
11.	736-0329	Lock Washer 1/4" I.D.
12.	737-0143	Oil Drain Cap
13.	737-0164	Pipe Nipple 3.8 x 18 NPT
14.	751-0535	Fuel Line Hose
15.	751-0564	Deflector: Muffler
16.	751-0616	Muffler
17.	751-0623	Exhaust Pipe - L.H.
18.	751-0624	Exhaust Pipe - R.H.
19.	783-0357B	Heat Shield
20.	783-0615B	Muffler Bracket

Single Cylinder Engine (Briggs & Stratton)

Parts List
Ref. No.	Part No.	Description
1.	629-0207	Harness Adapter (Mag.)
2.	629-0302D	Wire Harness w/Lt./Amp./Sw.
3.	629-0301D	Wire Harness w/o Lt./Amp./Sw.
4.	725-0267	Ignition Switch
5.	725-0634	Light Switch (Optional)
6.	725-0925	Ammeter (Optional)
7.	725-0963	Bulb (Headlight)
8.	725-1426	Solenoid
9.	725-1643	Safety Switch (Reverse)
10.	725-1657A	Safety Switch

Over Head Valve Engine (Wiring)

Parts List
Ref. No.	Part No.	Description
1.	629-0305D	Wire Harness w/Lt./Amp./Sw.
2.	629-0304D	Wire Harness w/o Lt./Amp. Sw.
3.	725-0634	Light Switch (Optional)
4.	725-0925	Ammeter (Optional)
5.	725-0963	Bulb (Optional)
6.	725-1396	Ignition Switch
7.	725-1426	Solenoid
8.	725-1643	Safety Switch (Reverse)
9.	725-1657A	Safety Switch

Tecumseh Engine

Parts List
Ref. No.	Part No.	Description
1.	710-0148	Hex Bolt #8-32 x .38" Lg.
2.	710-0599	Hex Wash. Hd. TT-Scr. 1/4-20 x .5" Lg.
3.	710-0604A	Hex Wash. Hd. TT-Scr. 5.16-18 x .62"
4.	710-1314	Socket Hd. Bolt 5.16-18 x .62" Lg.
5.	710-1315	Hex Wash. Hd. TT-Scr. 3.8-16 x 1.25"
6.	712-0271	Hex Sems Nut 1/4-20 Thd.
7.	721-0348	Exhaust Gasket
8.	726-0205	Hose Clamp
9.	726-0272	Clamp
10.	736-0119	Lock Washer 5/16" I.D.
11.	751-0535-12	Fuel Line Hose
12.	751-0564	Muffler Deflector
13.	751-0617	Muffler
14.	751-0620	Exhaust Pipe (16/17 HP)
15.	751-3140	OIl Drain
16.	751-3141	Oil Drain Hose Extension
17.	751-3142	Oil Drain Cap
18.	783-0615B	Muffler Bracket

Kohler Engine

Parts List
Ref. No.	Part No.	Description
1.	710-0148	Hex Tap Scr. #8-32 x .38" Lg.
2.	710-0599	Hex Wash. TT-Tap Scr. 1/4-20 x .5" Lg.
3.	710-0604A	Hex Wash. TT-Tap Scr. 5.16-18 x .62"
4.	710-3206A	Hex Bolt M8 x 1.25
5.	712-3086	Hex Flange Nut M8 Thd.
6.	721-0375	Exhaust Gasket
7.	726-0205	Hose Clamp
8.	726-0272	Clamp
9.	736-0607	External L-Wash. 5/16" I.D.
10.	751-0535-12	Fuel Line Hose
11.	751-0564	Muffler Deflector
12.	751-0617	Muffler
13.	751-0621	Exhaust Pipe
14.	751-3140	Oil Drain
15.	751-3141	Oil Drain Hose Extension
16.	751-3142	Oil Drain Cap
17.	783-0615B	Muffler Bracket

Kohler Electrical Controls
Ref. No.	Part No.	Description
1.	726-3046	Ratchet
2.	725-1657A	Safety Switch
3.	725-1426	Solenoid
4.	725-0963	Bulb (Headlight)
5.	725-0925	Ammeter
6.	725-0634	Light Switch
7.	725-0267	Ignition Switch
8.	629-0302D	Wire Harness
9.	629-0209	Wire Harness Adapter
10.	629-0132	Wire Harness (Monitor)

Intek Twin Engine

Parts List
Ref. No.	Part No.	Description
1.	710-0148	Hex Tap Scr. #8-32 x .38" Lg.
2.	710-0599	Hex Wash. TT-Tap Scr. 1/4-20 x 5" Lg.
3.	710-0604A	Hex Wash. TT-Tap Scr. 5.16-18 x .62"
4.	710-1237	Screw
5.	710-1314	Socket Head Scr. 5.16-18 x .62"
6.	710-1315	Hex TT-Tap Scr. 3.8-16 x 1.25"
7.	721-0460	Exhaust Gasket
8.	726-0205	Hose Clamp
9.	726-0272	Clamp
10.	736-0119	Lock Washer 5/16 I.D.
11.	751B2211535	Casing Clamp
12.	751-0535	Fuel Line Hose
13.	751-0564	Muffler Deflector
14.	751-0616	Muffler
15.	751-0560	Exhaust Pipe-R.H.
16.	751-0651	Exhaust Pipe-L.H.
17.	751-3140	Oil Drain
18.	751-3141	Oil Drain Hose Extension
19.	751-3142	Oil Drain Cap
20.	783-0615B	Muffler Bracket
21.	783-0625C	Heat Shield

Intek Twin Electrical Components
Ref. No.	Part No.	Description
1.	725-1657A	Safety Switch
2.	725-1426	Solenoid
3.	725-1396	Ignition Switch
4.	725-0963	Bulb (Headlight)
5.	725-0925	Ammeter
6.	725-0634	Light Switch
7.	629-0305D	Wire Harness w/Lt./Amp./Sw.
8.	629-0306C	Wire Harness w/Lt./Amp/Mon.

Model Series 660 Thru 679 - Wiring Diagrams

This section provides wiring diagrams for various engine configurations in MTD Model Series 660 Thru 679, including Single Cylinder (Briggs & Stratton), Over Head Valve, Twin Cylinder (Briggs & Stratton), and Tecumseh engines. Diagrams illustrate harness routing and component connections.

Single Cylinder Briggs & Stratton Wiring

Parts List
Ref. No.	Part No.	Description
1.	629-0207	Harness Adapter (Mag.)
2.	629-0302D	Wire Harness w/Lt./Amp./Sw.
3.	629-0301D	Wire Harness w/o Lt./Amp./Sw.
4.	725-0267	Ignition Switch
5.	725-0634	Light Switch (Optional)
6.	725-0925	Ammeter (Optional)
7.	725-0963	Bulb (Headlight)
8.	725-1426	Solenoid
9.	725-1643	Safety Switch (Reverse)
10.	725-1657A	Safety Switch

Over Head Valve Engine Wiring

Parts List
Ref. No.	Part No.	Description
1.	629-0305D	Wire Harness w/Lt./Amp./Sw.
2.	629-0304D	Wire Harness w/o Lt./Amp. Sw.
3.	725-0634	Light Switch (Optional)
4.	725-0925	Ammeter (Optional)
5.	725-0963	Bulb (Optional)
6.	725-1396	Ignition Switch
7.	725-1426	Solenoid
8.	725-1643	Safety Switch (Reverse)
9.	725-1657A	Safety Switch

Twin Cylinder Briggs & Stratton Wiring

Parts List
Ref. No.	Part No.	Description
1.	629-0208	Harness Adapter
2.	629-0302D	Wire Harness w/Lt./Amp./Sw.
3.	629-0301D	Wire Harness w/o Lt./Amp./Sw.
4.	725-0267	Ignition Switch
5.	725-0634	Light Switch
6.	725-0925	Ammeter
7.	725-0963	Bulb
8.	725-1426	Solenoid
9.	725-1643	Safety Switch (Reverse)
10.	725-1657A	Safety Switch
11.	629-0125	Harness Adapter (Alt.)

Tecumseh Wiring

Parts List
Ref. No.	Part No.	Description
1.	629-0302D	Wire Harness w/Lt./Amp./Sw.
2.	629-0301D	Wire Harness w/o Lt./Amp./Sw.
3.	725-0267	Ignition Switch
4.	725-0634	Light Switch (Optional)
5.	725-0925	Ammeter (Optional)
6.	725-0963	Bulb (Headlight)
7.	725-1426	Solenoid
8.	725-1643	Safety Switch (Reverse)
9.	725-1657A	Safety Switch

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