Single-speed Transmission
REF. | PART | |
NO. | NO. | DESCRIPTION |
1 | 618-0318 | Clutch Collar† |
2 | 710-0788 | Self-tapping Screw, 1/4-20 x 1.0 |
3 | 711-1274 | Drive Shaft |
4 | 711-1280 | Counter Shaft |
5713-0474 22-link Chain, #420
6713-0478 14-tooth Sprocket
7717-1422 Sprocket Bevel Gear, 42/10
8717-1565 29-tooth Spur Gear
9717-1569 20-tooth Spur Gear
10718-0652 Counter Shaft Coupling
11719-0394 Lower Housing
12a | 736-0336 | Flat Washer, 5/8 x 1.0 x .030* |
12b | 736-0337 | Flat Washer, 5/8 x 1.0 x .040* |
12c | 736-0349 | Flat Washer, 5/8 x 1.0 x .020* |
13736-0519 Flat Washer, .70 x 1.125 x .031
14741-0336 Flange Bearing, 5/8 x 3/4 x 3/4
15741-0337 Flange Bearing, 5/8 x 3/4 x 15/16
16750-1238 Spacer, .635 x 1.0 x .27
17611-0112 Detent Shaft Assembly†
611-0133 Detent Shaft Assembly‡
18618-0369 Differential Assembly†
618-0424 Differential Assembly‡
19661-0006 Brake Assembly
20710-1325 Self-tapping Screw, 1/4-20 x 1.625
21710-1206 Self-tapping Screw, 1/4-20 x 2.375
22 | 717-0678 | Brake Pad |
23 | 732-0863 | Compression Spring |
24 | 741-0862 | Detent Ball |
25 | 761-0202 | Brake Disc |
26 | 711-1331 | Input Shaft† |
| 711-1430 | Input Shaft‡ |
27716-0385 Retaining Ring, .394†
716-0108 Retaining Ring, .437‡
28717-1571 12-tooth Bevel Pinion†
717-1464 14-tooth Bevel Pinion‡
29719-0391A Upper Housing
30736-0335 Thrust Washer, .63 x 1.24 x .062†
736-0723 Thrust Washer, .635 x 1.25 x .042‡
31741-0525 Needle Bearing, .625 x .875
32 | 718-0228 | Clutch Collar‡ |
33 | 711-1431 | Drive Shaft‡ |
34750-1234 Spacer, .633 x 1.0 x .513
35717-1362 42-tooth Bevel Gear‡
36717-1363 42-tooth Bevel Gear‡
37736-0495 Thrust Washer, 1.0 x .632 x .0
38741-0340 Sleeve Bearing, .75 x .1.0 x 1.0
39721-0338 Seal, .75 x 1.0 x .125
40 | 716-0231 | E-ring, .75 |
41 | 618-0551 | Transmission Assembly Complete |
*If rebuilding transmission for any reason, use applicable flat washer (12a, 12b, or 12c) in this application allowing proper end play as instructed in MTD ’s Service Manual.
IMPORTANT: One of two different transmissions may be found on your lawn tractor (618-0307B & 618-0307C). Refer to the model plate found on the rear right portion of the transmission’s lower housing before ordering replacement service parts.
†Used on Single-speed transmission 618-0307B ONLY.
‡Used on Single-speed transmission 618-0307C ONLY.
