
ROTARY LAWN MOWER - - MODEL NUMBER SO45Y21CA
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ROTARY LAWN MOWER - - MODEL NUMBER SO45Y21CA
KEY PART
NO. NO. DESCRIPTION
1 166860X479 Upper Handle
2 151721X479 Lower Handle
3 146771 Control Bar
4 182755 Engine Zone Control Cable
5 131959 Handle Bolt
6 136376 Handle Knob
7 51793 Hairpin Cotter
8 66426 Wire Tie
9 180479 Rear Door Kit (Incl. Key #16 & 17)
10 128415 Pop Rivet
11 175069X479 Support Bracket LH
12 175070X479 Support Bracket RH
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13 17060410 Screw 14-20 x 5/8
14 175082X479 Handle Bracket Assembly (Left)
15 175081X479 Handle Bracket Assembly (Right)
16 180071 Spring LH
17 180072 Spring RH
18 63601 Keps Locknut 1/4-20
19 179585 Rope Guide
20 178398 Rear Skirt
21 88652 Hinge Screw 1/4-20 x 1-1/4
22 84596 Engine Pulley
23 87677 Hi-Pro Key #505
24 - - - Engine, Briggs & Stratton, Model No. 10G902
(order parts from engine maufacturer)
25 150406 Hex Head Thread Rolling Srew 3/8-16 x 1-1/8
26 83923 Hex Flange Nut
27 149838 Wheel
28 175231 Shoulder Bolt
KEY PART
NO. NO. DESCRIPTION
30 165761X004 Axle Arm Assembly RR
31 87877 Selector Knob
32 175060X004 Selector Spring
34 165762X004 Axle Arm Assembly LR
35 77400 Hubcap
36 184193 Bolt
38 176185 Washer
39 176235 Push Nut
43 175083 Bottom Belt Cover
44 186160 Lawn Mower Housing
45 141846 Danger Decal
46 851514 Blade Adapter
47 175064 Blade 21”
48 851074 Hardened Washer
49 850263 Helical Washer 3/8-24 x 1-3/8 Gr. 8
50 851084 Hex Head Machine Screw 3/8-24 x 1-3/8 Gr. 8
93 175066 Mulcher Door
94 175735 Hinge Bracket
95 175285 Spring
96 175650 Rod, Hinge
99 175071 Discharge Defl ector
100 132004 Nut, Hex
- - 161058 Warning Decal (Not Shown)
- - 172787 Operator’s Manual, English
- - 172789 Operator’s Manual, Spanish
- - 186106 Repair Parts Manual, English
NOTE: All component dimensions given in U.S. inches.
1 inch = 25.4 mm

ROTARY LAWN MOWER - - MODEL NUMBER SO45Y21CA
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ROTARY LAWN MOWER - - MODEL NUMBER SO45Y21CA
KEY PART
NO. NO. DESCRIPTION
1 184588 Control Cable Assembly
2 167387 Bearing, Wheel Adjuster
3 751152 Locknut #10-24
4 158755 Hex Washer Head Screw 1/4-20 x 2.12
5 175436 V-Belt
6 150495 Spring Retainer
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8 77400 Hubcap
9 145212 Locknut
11 180776 Wheel & Tire Assembly
12 12000058 E-Ring
13 137054 Pinion
14 180504 Dust Cover
16 67725 Washer 1/2 x 1-1/2 x .134
18 87877 Selector Knob
26 175262 Pan Head Tapping Screw #10-24 x 2-3/4
KEY PART
NO. NO. DESCRIPTION
28 181468 Dive Cover
31 132010 Hex Flange Nut
32 137052 Drive Pulley
35 151521 Kit, Wheel Adjuster, LH
(Includes Knob and Bearing)
36 180184 Gear Case Assembly (See Breakdown)
37 137090 Spring
38 63601 Locknut 1/4-20
41 151520 Kit, Wheel Adjuster, RH
(Includes Knob and Bearing)
54 186730 Grassbag Assembly
55 175739 Driveshaft Cover
57 183993 Frame
NOTE: All component dimensions given in U.S. inches.
1 inch = 25.4 mm

ROTARY LAWN MOWER - - MODEL NUMBER SO45Y21CA
GEARCASE ASSEMBLY - - PART NUMBER 180184
KEY PART
NO. NO. DESCRIPTION
1 183497 Case, Lower
2 183498 Case, Upper
3 183499 Gear, 27 Teeth
4 183500 Lever, Clutch
5 183501 Spring, Return
6 183502 Shaft, Input
7 183503 Dog, Movable
8 183504 Dog, Fixed
9 183505 Wire, Formed
10 183506 Bearing, Ball
11 183507 Fork, Shift
12 183508 Seal, Output Shaft
13 183509 Washer
14 183510 Seal, Case
15 183511 Bushing
16 183512 Shaft, Output
17 183513 Screw
18 183514 Seal, Input Shaft
- - 183404 Kit, Gearcase Replacement (Includes Instructions)
NOTE: Use Dow Corning #709 to reseal Gear Case Halves.
NOTE: All component dimensions given in U.S. inches.
1 inch = 25.4 mm
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