MTD 21-2251H 22-Inch Rotary Mower Parts Diagram and List

Model: 21-2251H

Also for Model: 21-2261H

Grass Catcher Model: GC 6AA - P/N 161018

Repl. Bag: P/N 160457

Parts Diagram Overview

This document provides an exploded view and a detailed parts list for the MTD 21-2251H 22-inch side discharge front cog drive self-propell rotary mower. The diagram illustrates the assembly of various components, including the mower deck, front and rear wheels, handle assembly, engine, drive system, and grass catcher. Each part is identified by a numerical index corresponding to the parts list.

Key components visible in the diagram include:

Mower Deck (Part 3)
Wheel Assemblies (Part 5), including 8" Steel White Cog (Part 041095), 8" Plastic White Cog (Part 040741), and 7" Plastic White Cog (Part 040766)
Handle Assembly (Parts 9, 10, 11, 17, 18, 19, 27)
Engine and Control Systems (Parts 6, 7, 7A, 8, 11, 15, 21, 26, 27, 28, 40, 41, 44, 45, 47, 48, 49, 50, 51, 52, 53, 77, 78)
Drive System Components (Parts 50, 51, 52, 53, 58, 59, 60, 61, 62, 63, 64, 79)
Blade and Blade Adapter (Parts 4, 31, 32, 33, 36, 42, 46)
Grass Catcher (Parts 161018, 160457)
Various fasteners, washers, nuts, and pins (e.g., Parts 13, 15, 23, 24, 25, 35, 37, 38, 41, 43, 45, 46, 48, 55, 56, 57, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 80, 81, 82, 83, 84, 85)

A "DANGER" decal (Part 32) and "Blade Warning" decal (Part 33) are also indicated.

Parts List

Index No.	Part No.	Description
1	153890	Eyebolt
2	012831	Cover Assembly w/Ht. Adj.
2	012823	Cover Assembly w/o Ht. Adj.
3	018069	Deck - 22"
4	030049	Blade 22" Flat
5		Wheel Assemblies.
	041095	Wheel - 8" Steel White Cog
	040741	Wheel - 8" Plastic White Cog
	040766	Wheel - 7" Plastic White Cog
6	051219	Control Throttle w/Cable
7	051490	Cable Engine/Blade Control (Flag type)
7A	052225	Cable Engine/Blade Control (Snap-in type)
8	051607	Control - Ground Drive
9	071563	Handle Lower
10	071092	Handle Upper
	071100	Handle - Upper Cushioned.
11	091249	Back Plate Ht. Adjuster
12	085019	Wheel Arm Assy.
13	715524	Locknut 3/8-16 Jam
14	101519	Baffle Rear & Front
15	106336	Washer Blade Adapter
16	106914	Clip Trailing Shield
17	107086	Handle Bracket - R.H.
18	107094	Handle Bracket - LH.
19	097659	Bail Engine/Blade Control
20	391706	Chute Deflector Assembly
21	110379	Cable Tie
22	463778	Bearing Plate
23	152421	Spring Washer
24	715011	Hitch Pin
25	112540	Plastic Tip-Ht. Adjuster
26	111526	Actuator-Engine Control
27	111609	Trailing Shield - 22" w/o Ht Adj.
	111617	Trailing Shield - 22" w/Ht. Adj.
28	783605	Rod - Engagement w/o Ht. Adj.
	783613	Rod - Engagement w/Ht. Adj.
29	120295	Master Link #65
30	778696	Actuator Arm - 8" Wheel
	108878	Actuator Arm- 7" Wheel
31	133231	Blade Adapter
32	144063	Decal Danger
33	009415	Decal Blade Warning
34	144899	Decal Starting Instructions
35	150011	Bolt Carriage 1/4-20 x 5/8
36	150730	Shoulder Bolt - Rear
37	150201	Washer Curved 5/16
38	150235	Wingnut 5/16-18
39	150276	Woodruff Key #6
40	150318	Cable Clamp
41	150623	Screw Hex Head Sht. Metal #10 x 5/8
42	162024	Bolt-Blade 3/8-24 x 1-1/4 Gr. 8
43	151522	Bolt #10-24 x 3/8
44	775858	Spring Drive Control
45	151613	Bolt Hex Head Sems
46	151928	Bolt Curved Head Square 5/16-18 x 1 3/4
47	151944	Bolt Oval Head Machine, #10-24 x 2
48	151985	Nut-Hex #10-24
49	152074	Rope Stop
50	775817	Spring - Pinion Assy.
51	152181	Screw Bail Retaining
52	771691	Bracket
53	769067	Bracket Pinion Tube
54	152371	Rope Guide
55	152405	Bolt Carriage 3/8-16 x 3/4
56	156182	Washer Plastic
57	156125	Shoulder Bolt - Ht. Adjuster
58	170142	Sprocket 8 Tooth
59	314096	Roll Pin 3/16 x 1-1/4
60	317016	Cotter Pin 1/8 x 1
61	416693	Pinion
62	417741	Shaft w/o Ht. Adj.
	417766	Shaft w/Ht. Adj.
63	423319	Bearing
64	425306	Chain
65	449587	Bolt Hex Head 1/4-20 x 5/8
66	452250	Push Nut
67	452318	Nut-Nylon Insert #10-24
68	457168	Bolt Thread Form 3/8-16 x 7/8
69	457499	Bolt Thread Form 1/4-20 x 1/2
70	458687	Bolt #10-24 x 1/2
71	459206	Bolt Flange Head, 1/4-20 x 5/8
72	156166	Bolt Shoulder Front
73	468355	Spacer Pivot
74	468405	Spacer w/Ht. Adj.
	468397	Spacer - w/o Ht. Adj.
75	715508	Nut Top Lock 1/4-20
76	715037	Nut Kep 1/4-20
77	451419	Nut-Top Lock Flange 1/4-20
78	451492	Nut 3/8-16 TopLock Flange
79	715193	Roll Pin 3/16 x 1
80	715607	Washer Belleville
81	153874	Bolt-1/4-20 x 2 1/4 Hex Head
82	156877	Washer-3/8 Hardened
83	715417	Washer-3/8 SAE
84	159004	Bolt-1/4 - 20 x 3/4
85	715201	Bolt-3/8-16 x 3/4 w/o Ht. Adj.

Notes

When servicing, use only genuine factory replacement parts that are specifically for your particular model.

NOTE: Parts are right or left hand as viewed from the operator position. ?

Specifications subject to change without prior notice. ⚙️

• Indicates optional equipment. ✔️

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