Page 1
Illustrated Parts Manual
Printed In USA
Transmatic Lawn Tractor — TB42 7-speed
TROY-BILT LLC, P.O. BOX 361131 CLEVELAND, OHIO 44136-0019
Form No. 769-10459
(December 08, 2014)
Page 2
To The Owner
Thank You
Thank you for purchasing an MTD Lawn Tractor. It was carefully
engineered to provide excellent performance when properly
operated and maintained.
All information in this manual is relative to the most recent
product information available at the time of printing. Please be
aware that this Illustrated Part’s Manual may cover a range of
product specifications for various models.
Table of Contents
K Style Hood ............................................................. 4
Frame and PTO Lift ................................................. 6
Front End Steering ................................................... 8
Seat and Fender .....................................................10
Transmission ........................................................... 12
42” Deck ..................................................................14
MTD P90 ..................................................................16
Wiring Harness Schematic - 725-04567H .............17
Engine Model 4P90HUA ........................................18
Components listed and/or illustrated in this manual may not be
applicable to all models. We reserve the right to change product
specifications, designs and equipment without notice and
without incurring obligation.
Throughout this manual, all references to right (RH) and left (LH)
are observed from the operating position.
Record Product Information
To ease in ordering replacement parts, please locate the model
plate on the equipment and record the information in the
provided area to the right. You can locate the model plate by
looking beneath the seat.
Model NuMber
Serial NuMber
Painted Parts
When ordering painted service parts, a four digit color suffix must be added to the part number (e.g. 783-XXXXX-0637).
Please refer to the table below for current color codes:
0637 Black
0709 Dark Green (Bolens, Yard-Man)
0662 Oyster Gray (MTD Gold)
0638 Red (Yard Machines, Huskee, Troy-Bilt, MTD)
0691 Black Jack (MTD Gold, MasterCut)
0674 Yellow (Yard-Man)
0650 Metallic Red (White Outdoor)
0629 Silver Flake (MTD Platinum)
04038 Day Orange (Daedong)
04033 Flint Mica (Troy-Bilt XP)
2
Page 3
This page intentionally left blank.
Page 4
K Style Hood
14
35
17
3
2
47
1
1
34
42
29
26
16
8
4
7
1
13
21
31
27
37
39
41
40
15
6
7
38
46
44
9
43
45
23
25
30
33
A
27
18
4
22
24
19
28
20
B
A
36
B
16
10
1
12
11
32
5
Page 5
K Style Hood
Ref.
No.
1 710-0448 4 Screw 5/16-18 x .750
2 710-05281 Screw, #12-16 x 1.25
3 731- 0640 4 K-Style Bumper
4 710-05108 Screw, 1/4 x .750
5 72 5 - 0157 Cable Tie
6 925- 0963 Miniature lamp 12V socket
7 731- 060 95 Grill Lens - LH
8 910-0224 Screw, #10-16 x .500
9 736-3006 Lock Washer, 1/4
10 738- 0 4 0 91A Shoulder Screw .43 x .29
11 783- 05327B Suppport Bracket LH
12 783-05328A Suppport Bracket RH
13 683-04448 Battery Rod
14 683 -044 41A Hood
15 631-04272 Grill
16 710-05070A Screw, 1/4-20 x .500
17 710-044 83 Screw 1/4-20 x .500
18 710 -3144 Hex Screw 3/8-16 x 2.00
19 710 -3025 Hex Screw, 5/16-18 x .625
20 712- 0 4065 Flange Lock Nut 3/8-16
21 931-08054A Dash, Upper
22 783-06823 Speed Latch Tab
23 747- 0539 8 Speed Control Rod
24 750-04465C Flange Spacer .39 x .671 x 1.095
Part No. Description
731-06096 Grill Lens - RH
Ref.
No.
25 783-06991 Transmission Speed Latch
26 746-04367 Throttle/Choke Control Cable
27 710-1652 Tap Screw, 1/4-20, 0.625
28 710-060 4A Screw 5/16-18 x .625
29 741- 0587 Bearing, .628 ID x 1.36
30 712- 0 4063 Flange lock Nut 5/16-18
31 783-06785C Bracket, Steering Support
32 783-07083 Gas Tank Support Bracket
33 7 8 3 -0 6 811D Dash, Lower NWNDW
34 925-04659 Key Switch Module
35 625-05002 Key, Assembly
36 726-0230 Cable Tie
37 951-04304 Fuel Tank, 1.36 Gallon
38 951-12179B Fuel Cap
39 751-12 0 8 9 -28 Hose Vent, 3/16
40 735-04081 Rubber Grommet
41 751-12118 Rollover Valve
42 731- 05265 Choke Plug
43 710 - 0778 Hex Washer Screw, 1/4-20 x 1.50
44 731-07885B Shift Lever
45 731-07895A Index Control
46 732-04877 Compr. Spring, .72 OD x .78
47 931-09328 Plenum
— 925-04567H Harness, LT-5, NRMC,Dual
Part No. Description
5
Page 6
Frame and PTO Lift
39
18
37
29
17
19
13
B
22
16
5
5
34
A
43
8
12
B
A
31
27
C
2
6
26
32
3
11
8
30
24
33
28
1
12
9
23
15
4
10
4
45
48
36
5
46
21
47
25
24
11
6
3
23
15
7
20
42
28
38
35
41
40
4
44
14
8
C
33
6
Page 7
Frame and PTO Lift
Ref.
No.
1 68 3- 0 4195 Support Bracket
2 683 - 05139 Frame Assembly
3 710-0703 Screw Carriage, 1/4-20 x .75
4 710-0448 4 Screw 5/16-18 x .750
5 710-0599 Screw, 1/4-20 x .500
6 710-3008 Hex Screw, 5/16-18 x .75
7 712- 0 4 063 Flangelock Nut, 5/16-18
8 712- 0 4 064 Flangelock Nut, 1/4-20
9 925-04039 Screw Mount Interlock Switch
10 732-0735A Compression Spacer, 1.314 x 2.55
11 736-0173 Flat Washer, .28 x .74 x .063
12 738 -0 4237A Shoulder Spacer, 10-32 x .500
13 783-04548D Seat Frame Bracket
14 783-04637 Running Board Bracket
15 936-014 0 Flat Washer, .385 x .62 x .063
16 783-04869A Battery Bracket
17 710-04666 Hex Head Flange, 1/4-20 x .75
18 712-0271 Sems Nut, 1/4-20
19 925-1707D 230 CCA Battery
20 783-04536B Support Bracket
21 647-05041 PTO Handle Assembly
22 683-04334 Lift Assembly
23 712- 04 0 65 Flangelock Nut, 3/8-16
24 714-04040 Bow-tie Cotter Pin
Part No. Description
Ref.
No.
25 716 -0106A E Ring
26 720- 0298 Handle Grip, 5/8
27 732-04438 Torsion Spring
28 938-0380 Shoulder Bolt, 3/8-16 x .50 x .270
29 9 41-02 25 Hex Flange Bearing
30 747-04653A Deck Lift Handle
31 747- 0 6237A Lift Rod, RH
32 747- 06253 Lift Rod, LH
33 783-0678C Lift Arm
34 725-04363 Switch Interlock
35 736-0322 Flat Washer, .450 x 1.250 x .164
36 741-04119A PTO Bearing
37 946 - 05124 A Deck Engage Cable
38 756 -04196A Engine Pulley, 3.39 x 6.12
39 683-04448 Battery Hold Down Rod
40 936-0300 Flat Washer, .406 x .875 x .059
41 747- 0 4 857 42" Belt Keeper
42 710-060 4A Screw, 5/16-18.0 x .625
43 725- 0 6153 12V Solenoid
44 710 -3157A Hex Screw, 7/16-20 x 3.25
45 914-0145 Click Pin, .092 x 1.64
46 720-04049A Handle Grip, 3/8
47 732-04276A PTO Spring Extension
48 738-04425 Shoulder Bolt, 1/4-28 x .342 x .335
Part No. Description
7
Page 8
Front End Steering
21
22
8
1
40
27
13
17
3
11
30
14
15
6
10
41
5
19
20
7
2
18
4
8
8
27
29
38
28
39
24
39
9
12
29
33
32
31
37
28
26
25
34
36
35
23
25
16
8
Page 9
Ref. Part Number Description
1 617- 04 0 9 4 Front Steering Gear Assembly
2 710 -0514 Hex Screw, 3/8-16 x 1.00
3 710 -0643 Hex Screw, 5/16-18 x 1.00, Lock
4 710 -1309 Machine Screw, 5/16-18 x .750
5 710-318 0 Hex Screw, 5/16-18 x 1.75
6 912- 024 0 Jam Nut, 7/16-20
7 912- 0214 Jamlock Nut, 3/8-24
8 712- 04 063 Flangelock Nut, 5/16-18
9 938- 0 4 013 Front RH Axle
10 923-0448A Ball Joint, 7/16-20
11 736-0242 Bell Washer, .340 x .872 x .060
12 938-04014A Front LH Axle
13 738- 0 4141 Shoulder Bolt, 5/16-18 x .435 x .350
14 938-05078 Steering Shaft, 5/8
15 941-04124 Flange Bearing, 5/8
16 931-0484A Hub Cap
17 747- 05385A Steering Link
18 948-0389 Cap, 1.25 x .16
19 748 -04278 Steering Block
20 748- 0 4 0 6 8 Spacer, .71 x .125 x .56
21 731-04681 Cap, Troy-Bilt
22 783-08577 Stabilizer Plate
23 736-04228A Flat Washer, .781 x 1.590
24 6 83- 0128B Pivot Axle
25 714- 0162 Cotter Pin, 5/32 x 1.25
26 710 - 04484 Screw, 5/16-18 x .750
27 912- 0431 Flangelock Nut, 3/8-16
28 914 - 0474 Cotter Pin, .125 x .75
29 634-05053-0911 Wheel Assembly
30 631- 04028 Steering Wheel
31 634-05066 Rim Asm, 6.0 x 4.5
32 934-0255 Valve, tubeless Air
33 734-04240A-0901 Tire, 15 X 6 X 6 Rd Shldr
34 738 - 04128 Shoulder Bolt, 3/8-16 x .500 x 2.38
35 747-042 9 9A Fixed Rod
36 783- 05326B Pivot Bar Bracket
37 726- 0341 Push Cap, 3/4
38 731- 0 4057A Standard Axle Cap
39 741- 0660A Flange Bearing, .760 x .941 x 1.0
40 750 -0 6192A Spacer, .38 ID x .854 OD x .20
41 736 -0331 Bell Washer, .390 x 1.13 x .062
Front End Steering
9
Page 10
Seat and Fender
16
15
2
26
13
10
13
1
7
12
14
11
9
20
9
12
8
17
24
6
22
23
25
4
18
19
21
5
3
10
Page 11
Seat and Fender
Ref.
No.
1 710-05070A Screw, 1/4-20 x .500
2 710-0448 4 Screw, 5/16-18 x .750
3 710-059 9 Screw Pan Torx Head, 1/4-20 x .500
4 731-04591A Cup Holder
5 710 -013 4 Screw Carriage, 1/4-20 x .62
6 783-04587D Fender - Red
7 783-04843 Lift Adjuster Bracket - Powder Black
8 783-1489 D Seat Mount Bracket - Powder Black
9 712- 0 4 063 Flangelock Nut, 5/16-18
10 732-11 8 4 Extension Spring
11 936 -0108 Flat Washer, .510x .750 x .033
12 736-0242 Bell Washer, .340 x .872 x .060
13 938- 0296 Shoulder Screw, 5/16-18 x .437 x .268
14 783-0209D Lift Seat Bracket
15 783 - 040 81D Pivot Seat Manual Adjust Bracket
16 757- 04083A Med. Back Seat, Black
17 725 -1439 Inner Seat Spring
18 720 -04061 Knob, 3/8-16 x .875
19 735-04047 Foot Pad, LH
20 735-04048 Foot Pad, RH
21 726-3046 Ratchet Clip, .250 x .500
22 710 -0227 Screw, 8-18 x .500
23 726 - 0279 Insulator Plate
24 925-1308A Outer Seat SPring
25 726 - 0278 Insulator Boss Plate
26 736-0607 Loack Washer, 5/16
Part No. Description
11
Page 12
Transmission
25
17
3
20
27
12
38
42
6
52
32
10
12
40
34
8
57
58
59
7
39
2
18
55
56
33
61
4
29
60
21
24
A
5
46
47
44
19
13
35
36
16
46
28
43
41
12
23
53
15
37
49
B
55
30
A
48
1
9
26
44
47
14
45
B
22
54
54
51
50
49
31
11
Page 13
Transmission
Ref. Part Number Description
1 918-04566A Transmission Drive Assembly
2 647- 04034C Pedal Assembly
3 647- 04266 Shaft Lever Assembly
4 710-0227 Screw, 8-18:0.500
5 710-0448 4 Screw, 5/16-18 x .750
6 710-059 9 Screw, 1/4-20 x 0.500
7 710-0604A Screw, 5/16-18 x 0.625
8 710-0809 Screw, 1/4-20 x 1.250
9 710 -1266 Hex Screw, 5/16-18 x 3.50
10 710-3008 Hex Screw, 5/16-18 x .75
11 711 - 06103 Ferrule, 3/8-24 X .375 DIA.
12 712- 0 4 063 Flangelock Nut, 5/16-18
13 712-070 0 Flange Nut, 9/16-18
14 914 -0209 Cotter Pin INT- .125 DIA
15 714-04040 Bow-Tie Cotter Pin, 72
16 718 - 0 4 407 Pulley Hub, 5/8 SPLINE
17 720-04028 Shift Knob
18 725 -0157 Cable Tie
19 725-1644 Short Spring Switch
20 726 -0214 Push Cap, 5/8
21 926-0320 Plate Insulator Nut
22 731-04602 Sleeve, .758 x .821 x 3.3125
23 731-04604 Sleeve, .758 x .821 x 2.4375
24 732-04306 Spring Extension, .80 OD x 3.28 LG
25 732- 04488 Spring Extension, .38 OD x 3.25 LG
26 732-0716D Spring Extension, .59 OD x 4.00 LG
27 735-0239 Foot Pad, 4.0 LONG
28 756-0 4325 Idler Pulley
29 747- 05243 Shift Rod
30 747- 0518 6 Variable Speed Control Rod
31 747-0518 8 Brake Rod
Ref. Part Number Description
32 747- 0 4969 Belt Keeper Rod
33 934-0255 Valve, tubeless Air
34 750-0566A Spacer, .260 x .375 x 1.030 LG
35 750-0802 Spacer, .640 ID x .76 OD x 2.63
36 954-05040 V Belt, 5L 35.25 POLY
37 954-04249A V Belt, 5L 70.90 POLY
38 956- 04002 V Pulley 7.25 DIA SPUN
39 783-04536B Pedal Support Bracket
40 783-04595A Shaft Adjust Bracket
41 956- 0 4015A Variable Speed Pulley Assembly
42 683-04176A Transmission Bracket Assembly
43 753-05147 Idler Bracket Assembly
44 710-0347 Hex Screw, 3/8-16 x 1.75
45 710 -1260A Screw, 5/16-18 x 0.750
46 712- 0 4065 Flangelock Nut, 3/8-16
47 938 - 0347 Shoulder Spacer, .625 ID x .169
48 753 - 05147 Bracket Assembly
49 710- 05339 Screw, 5/16-24 x .750
50 710 -0778 Screw, 1/4-20 x 1.500
51 718 - 04261 Bearing Cup
52 732-04746 Extension Spring, .94 OD x 6.75 LG
53 948-0334 Spacer
54 941- 0600 Ball Bearing, 17 x 40 x 12
55 634-04324-0911 Wheel, 20 x 8 x 8
56 734-04241-0901 Tire, 20 X 8 X 8 Rd Shldr
57 725-04363 Switch Interlock
58 179 62 Plate Switch
59 738 - 042 37A Shoulder Screw, #10-32 x .500
60 731-06894 Shift Plate Bearing
61 634-04369-0662 Rim, 8.0 x 7.0 x .750
13
Page 14
42” Deck
29
41
35
44
24
25
1
43
11
13
5
3
27
10
14
37
42
40
15
32
26
4
11
16
11
22
18
42
40
7
31
14
38
56
2
19
49
48
47
48
47
46
6
50
30
53
57
52
23
17
51
55
1
39
45
8
58
18
17
12
21
19
28
9
34
36
20
33
54
14
Page 15
42” Deck
Ref. Part Number Description
1. 918-06991 Spindle Ass’y, Pulley, 6.2 Dia
2. 683-0254B Bracket Ass’y, Deck, Hanger LH
3. 783-08690 Belt Keeper
4. 983-05183 Brake Assembly, Deck, LH
5. 9 83- 05182 Brake Assembly, Deck, RH
6. 983- 05184 Deck Assembly, 42”
7. 710-0347 Hex Screw, 3/8-16 x 1.75
8. 710 - 0376 Hex Cap Screw, 5/16-18 x 1.00
9. 710-04484 Screw, Self-tapping, 5/16-18, .750
10. 710- 0528 Hex Screw, 5/16-18, 1.25, Gr5, Std
11. 710-0599 Screw, Self-tapping, 1/4-20, 0.500
12. 710 -12 6 0A Screw, 5/16-18 x 0.750
13. 710- 0 6133 Screw, M6-1 x .625
14. 710-3096 Hex Screw, 3/8-16, 2.00, Gr8, Std
15. 710 -0 6213 Hex cap Screw, 5/16-18 x 1.25
16. 783-06464 Deck Wash Plug
17. 712-0 4 0 63 Nut, Flange Lock, 5/16-18, Grf
18. 712- 04 0 65 Nut, Flange Lock, 3/8-16, Grf
19. 712- 0417A Nut, Flange, 5/8-18
20. 712-0 4243 Flange Lock Nut, 1/2-13
21. 714-04043 Bow-Tie Cotter Pin
22. 917-04074 Gear, Deck, Adjustment
23. 720-05010 Cap, .290 x .500
24. 750 -06184 Spacer, .385 x 1.75 x .585
25. 732-04629 Extension Spring, .750 X 4.77
26. 732- 05151A Torsion Spring, LH
27. 93 6- 0119 Washer, Lock, 5/16, Regular Duty
28. 936-0300 Flat Washer, .406 x .875 x .059
29. 710-0778 Screw, Self Tapping, 1/4-20, 1.50
Ref. Part Number Description
30. 631- 0 4354A Chute Deector Assembly
31. 738-05082 Shoulder Spacer, .970 x .190
32. 738-05088 Shoulder Spacer, .75 x .145
33. 942-04308 Blade, Cut, 21.23” 2-In-1, Econ
34. 747-05141A Rod, Lift, Deck, Frt, 12.7
35. 747- 0 6538 Brake Rod
36. 74 8 -04069 Deck Lift Pivot Cup
37. 748-05029A Shoulder Spacer, Idler
38. 748-05037A Shoulder Spacer, Pivot Idler
39. 954-04060C Belt, V Type, A Sec X 96.5
40. 756-05034 Pulley, Idler, 4.50”Dia
41. 750-0566A Spacer, .260 x .375 x 1.030
42. 783-08389 Pulley Cap
43. 783-08510 Deck Belt Cover, 42
44. 783-08654B Deck Idler Bracket
45. 710- 0751 Hex Cap Screw, 1/4-20 x .62
46. 73 8 -118 6A Shift, Spindle, 6.11.
47. 941-0919B Bearing, Ball, .787id x 1.85 Odx.551
48. 750-04936 Spacer, .792 x 1.060 x 1.860
49. 756-05031 Pulley, Deck, 5.4 Dia
50. 712-0 4 0 64 Nut, Flange Lock, 1/4-20, Nylon
51. 726-04009 Push Cap
52. 732-05261 Spring, Torsion, .440 ID x 1.75
53. 747-06290B Hinge Pin
54. 734- 0 4155 Wheel, Deck, 5.0 Dia Ball
55. 938-3056 Bolt, Shoulder, .496 x 2.50, 3/8-16
56. 738-04184A Shoulder Screw, 1/4-20
57. 783-08504A Bracket, Chute, 42”
58. 936-3039 Flat Washer, .406 x 1.50 x .105
15
Page 16
MTD P90
11
6
8
9
12
7
4
13
3
10
15
5
14
2
1
17
16
Ref. Part Number Description
1 683-04549A Muer Shield Assembly with Weld
2 710- 0227 Screw, 8-18 x .500
3 710-04683C Screw, 3/8-16 x 1.0
4 710- 0599 Screw, 1/4-20 x .500
5 710- 0642 Screw, 1/4-20 x .750
6 912-0691 Nut, M6-1, Hexlock
7 712-3086 Flange Nut, M8-1.25
8 725-0157 Cable Tie
9 726-0205 Clamp Hose, .490 diameter
10 731-05628 Oil Drain Sleeve
11 783 -0 8122 Deector Bracket
12 751-10349-16 Fuel Hose, Low Permeation
13 751-11053A Muer Deector Long
14 751-14527 Muer
15 BS-298090S Fuel Filter
16 710-05070A Pan Torx Screw 1/4
17 747- 06404A Muer Guard Rod
16
Page 17
Wiring Harness Schematic - 725-04567H
17
Page 18
Engine Model 4P90HUA Air Intake
120
126
121
128
122
126
121
125
123
127
18
Ref. Part Number Description
120 951-14 458 Air Filter Cover Assembly
121 951-14 466 Air Filter Lock Nut
122 951-12255 Air Filter Cover
123 951-12256 Sponge Filter
125 951-1226 0 Air Filter Assembly
126 712- 04212 Nut M6
127 951-12328 Rubber Cap
128 951-12257A Manifold
Page 19
138
138
137
136
133
133
135
130
131
131
132
4P90HUA Carburetor Assembly
I
J
K
L
M
O
P
F
K
N
B
C
E
Q
R
S
Ref.
Part Number Description
129 951-12258A Manifold Gasket
130 951- 05149 Carburetor Assembly
131 951 -117 31 Fuel Hose Clamp
132 951 -113 3 6 Fuel Line Kit
133 723-04071 Plastic Support Clamp
135 951-12 261 Carburetor Gasket
136 951-12262 Carburetor Insulator
137 951-12 263 Carburetor Insulator Gasket
138 951-12 26 4 Carb Stud
951-1470 8 Carburetor Kit - Major
A n/a Choke Shaft
B n/a Choke Shaft Fiber O-Ring
C n/a Choke Return Spring
D n/a Flat Steel Washer
E n/a Choke Plate
F n/a Idle Jet Assembly
G n/a Idle Jet O-Ring
H n/a Sheetmetal Housing
I n/a Throttle Shaft
J n/a Throttle Plate
K n/a Screw M3×5
L n/a Lock Washer
129
130
Ref.
Part Number Description
T
U
V
W
X
Y
Z
BB
M n/a Nylon/Plastic O-Ring
N n/a Fiber O-Ring
O n/a Idle Speed Adjusting Screw
P n/a Idle Mixture Screw
Q n/a Carburetor Body
R n/a Fuel Inlet
S n/a Float Pin
T n/a Emulsion Tube
U n/a Needle Valve
V n/a Main Jet
W n/a Needle Valve Spring
X n/a Float
Y n/a Fuel Bowl O-Ring
Z n/a Ring
AA n/a Fuel Bowl
BB n/a Solenoid Valve Assembly
CC n/a Solenoid Valve Washer
DD n/a Fuel Drain Plug Gasket
EE n/a Fuel Drain Plug
FF n/a Ring
GG n/a Seat/Fuel Bowl Bolt
19
Page 20
4P90HUA Crankcase
48
49
50
51
52
53
47
170
181
175
177
73
176
175
68
69
67
178
55
56
54
66
65
57
58
59
62
60
63
64
72
72
70
74
20
Page 21
5P65M0B Crankcase
Ref.
Part Number Description
47 951 -114 9 9 Upper Crankshaft Seal
48 710- 04916 B olt M 6×14
49 951-14456 Breather Cover Plate
50 951-12226 Breather Gasket
51 951-12685 Umbrella Valve
52 951-12227 Mesh Screen
53 951-12686 Umbrella Valve Seat
54 951-12228 Choke Linkage
55 947-06356 Governor Arm Shaft
56 736-04558 Governor Washer
57 714- 0 4 074 Governor Cotter Pin
58 9 51-11574 Governor Seal
59 951-12230 Throttle Linkage
60 951-12 231 Throttle Linkage Spring
62 9 51-12232 Governor Arm
63 710 -04908 Governor Arm Bolt
Ref.
Part Number Description
64 712-0 4212 Governor Arm Nut M6
65 932-05187 Governor Spring
66 710-04979 Bolt M6×18
67 710- 05310 Bolt M6×38
68 951-14457 Component Bracket/Separate
69 750-05530 Component Bracket Spacer
70 951-12235 Breather Hose Assembly
72 951-12236 Breather Hose Clamp
73 919-05022A Crankcase
74 951-12237 Crankcase Cover Gasket
170 951-05156 Piston Ring Set
175 951-11953 Piston Pin Snap Ring
176 951-14 677 Piston
177 951-1195 4 Piston Pin
178 951-1227 7 Connecting Rod Assembly
181 710- 05319 Connecting Rod Bolt
21
Page 22
4P90HUA Starter Assembly
8
9
10
11
12
11
22
24
25
36
34
35
33
32
35
36
34
31
26
30
24
13
25
29
30
11
12
12
14
15
16
17
18
19
20
21
37
37
Ref. Part Number Description
8 710 - 05306 Bolt M8×40
9 951-12207 Starter Assembly
10 710-05307 Screw M5×25
11 736-04554 Lock Washer 5
12 736-04556 Plain Washer 6
13 951-12 2 0 8 Electrical Starter Front Cover
14 951-12211 Bearing
15 951-12210 Pinion/Clutch Assembly
16 9 51-12 312 Gear
17 951-12 2 0 9 Bearing
18 951-12 212 Pinion Cover
19 951-12214 Bearing 6001Zz
20 951-12215 Starter Armature
21 951-12 216 Bearing
22
Ref. Part Number Description
22 951-1252 8 Starter Housing Assembly
24 951-12 217 Screw
25 736- 04554 Lock Washer
26 9 51-12529 Brush Assembly
29 951-12219 Electrical Starter Back Cover
30 710 -05308 Bolt M6×100
31 710 - 05309 Bolt M6×30 Assembly
32 951-12324 Waterproof Washer
33 736- 04555 Insulation Washer
34 736-04556 Plain Washer 6
35 736-04477 Lock Washer 6
36 712- 04212 Nut M6
37 715-04120 Dowel Pin 10×14
Page 23
4P90HUA Engine Shroud
182
1
2
3
4
5
6
6
182
2
3
4
2
3
4
7
Ref.
Part Number Description
1 951-12 205 Debris Shield
2 712- 0 4290 Nut
3 750-05320 Engine Shroud Spacer
4 951-14454 Starter / Shroud Stud M6×99
5 951 -11622 Flexible Clamp
6 710-05305 Hook Bolt
7 951-14455 Air Shield
182 710- 05303 Self-Tapping Bolt 5.5×25
23
Page 24
4P90HUA Crankshaft & Crankcase Cover
76
79
80
77
75
91
86
101
113
115
92
93
104
103
102
112
114
83
5
89
88
87
118
90
99
100
117
82
81
98
84
85
86
116
117
119
117
24
Page 25
4P90HUA Crankshaft & Crankcase Cover
Ref.
Part Number Description
5 951 -11622 Flexible Clamp
75 951-12238 Crankshaft Assembly
76 951-11969 Main Bearing
77 951-10307 Woodru Key
79 9 51-12239 Dipstick Assembly
80 951-12 241 Upper O-Ring
81 951-12 363 Lower O-Ring
82 951-1224 0 Oil Fill Tube Assembly
83 710 -04980 Bolt M6×35
84 951 -116 44 Oil Drain Plug
85 951-12242 Regulator
86 715-04121 Dowel Pin 8×14
87 9 51-12 243 Ball 6.35
88 951-12 244 Spring
89 710 -05312 Bolt
90 736-04557 Crankshaft Thrust Washer
91 951-12245 Balanceable Shaft Bearing
Ref.
Part Number Description
92 751-1224 6 Balanceable Shaft Assembly
93 736-04559 Balanceable Thrust Washer
98 951-1224 8 Oil Pump Assembly
99 951-12 247 O-Ring 10×2.65
100 951-12 249 Filter
101 951-12 250 Filter Spring
102 951-12251 O-Ring 35.5×2.65
103 951-12 252 Filter Cover
104 951-11956 Governor Gear/Shaft Assembly
112 710- 05313 Bolt M8×15
113 736-04560 Oil Drain Plug Washer
114 951-1269 0 Oil Filter
115 951-122 53 Screw Joint
116 919-05090 Crankcase Cover
117 710 - 04982 Bolt M8×54
118 951-113 75 Lower Crankshaft Seal
119 710 -05314 Bolt M8×43
25
Page 26
4P90HUA Cylinder Head
164
169
168
165
167
166
150
150
145
145
151
146
141
146
152
152
144
153
147
147
142
154
154
148
148
141
156
155
143
162
149
157
161
162
158
161
159
167
166
160
165
163
139
26
141
141
139
139
140
139
Page 27
4P90HUA Cylinder Head
Ref.
Part Number Description
139 710 -05315 Bolt M5×10
140 951-12265 Cowl
141 710- 05316 Valve Cover Bolt
142 951-12266 Valve Cover
143 951-12267 Valve Cover Ring
144 951-11981 Rocker Arm Assembly
145 751-11124 Jam Nut
146 751-11123 Fulcrum Nut
147 951-11966 Rocker Arm
148 710-04962 Rocker Arm Stud
149 951-12268 Push Rod Guide
150 951-12 269 Exhaust Valve Adjuster
151 951-12080 Exhaust Valve Spring Retainer
152 951-12 078 Valve Spring
153 951-1196 4 Intake Valve Seal
154 951-12 077 Valve Spring Retainer
Ref.
Part Number Description
155 951 -113 37 Valve Kit
156 951 -113 37 Valve Kit
157 712- 0 4219 Nut M8
158 951-12 271 Exhaust Pipe Gasket
159 951-14459 Mu Stud M8×47
159 951-14464 Muer Stud Assembly
160 951-10292 Spark Plug/F6Rtc
161 7 10- 05317 Bolt M10×1.25×85
162 710-05318 Bolt /M10×1.25×65
163 951-14706 Cylinder Head
164 951-1227 3 Cylinder Head Gasket
165 715-04122 Cylinder Head Dowel 12×16
166 951-11335 Push Rod Kit
167 951-11962 Tappet
168 736-04561 Camshaft Thrust Washer
169 951-12274 Camshaft Assembly
27
Page 28
4P90HUA Ignition & Electrical
40
41
42
38
38
44
39
46
45
Ref. Part Number Description
38 710- 0 4931 Bolt M6×28
39 951-12220 Ignition Coil Assembly
40 712- 0422 0 Flywheel Nut M16×1.5
41 951-12221 Plate
42 951-12222A Cooling Fan
43 919-05089 Flywheel
44 951-12224 Coil Assy.，Charge
45 710-04940 Bolt M6×10
46 951-12279 Cowl
43
38
28
Page 29
Notes
29
Page 30
30 Notes
Page 31
31Notes
Page 32
To order replacement parts or locate your nearest service dealer call a Customer Support at (800) 800-7310.
or visit www.mtdproducts.com to find the nearest authorized dealer in your area.
MTD LLC, P.O. BOX 361131 CLEVELAND, OHIO 44136-0019
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