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Scott Bonnar – Parts Buying Guide

Scott Bonnar Model 33 — Parts Diagrams & Spare Parts Lists (330026 & 330413)

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Factory parts lists for both Scott Bonnar Model 33 machines: the chain-drive 330026 and the belt-drive 330413. Every part is listed below with its illustration number, description, quantity and part number, alongside the chassis illustration for each model.

  • Models330026 (chain drive) and 330413 (belt drive), both 16″
  • Pages10
  • PublicationSections 1-6 and 1-5, Volume 2

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Exploded chassis illustration for the Scott Bonnar Model 33, model 330026 chain drive
330026 — chassis illustration · click to enlarge
Scott Bonnar Model 330026 parts list, sideframes, roller, soleplate and cutter
330026 — illustration nos. 1 to 46 · click to enlarge
Scott Bonnar Model 330026 parts list, drum bearings, clutch plate and engine clutch
330026 — illustration nos. 47 to 95 · click to enlarge
Scott Bonnar Model 330026 parts list, handles, chains, engine table and sprockets
330026 — illustration nos. 96 to 137 · click to enlarge
Exploded chassis illustration for the Scott Bonnar Model 33, model 330413 belt drive
330413 — chassis illustration · click to enlarge
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Second exploded chassis illustration for the Scott Bonnar Model 330413 belt drive
330413 — chassis illustration (second view) · click to enlarge
Scott Bonnar Model 330413 parts list, side frames, rollers, soleplate and cutter
330413 — illustration nos. 1 to 23 · click to enlarge
Scott Bonnar Model 330413 parts list, sprockets, drum shaft and drum bearings
330413 — illustration nos. 24 to 63 · click to enlarge
Scott Bonnar Model 330413 parts list, clutch plate, clutch rod and engine clutch
330413 — illustration nos. 63 to 105 · click to enlarge
Scott Bonnar Model 330413 parts list, jockey pulleys, handles, belt and Kirby HK25 engine
330413 — illustration nos. 106 to 153 · click to enlarge

Full parts list (text)

This document covers two different Model 33 machines, and it is worth checking which one you have before ordering:

  • Model 330026 — the chain drive 16″ machine (Section 1-6), fitted with a Kirby H4-4 engine.
  • Model 330413 — the belt drive 16″ machine (Section 1-5), fitted with a Kirby HK25 engine.

They share many part numbers but differ substantially through the drive: the 330026 runs chains to the cutter, while the 330413 uses an engine/cutter belt with jockey pulleys. The Illus. No. column refers to that model’s own chassis illustration in the viewer above.

Several 330413 parts changed partway through production — the handles, stay bar and clutch rod are listed separately to machine no. 336190 and from machine no. 336191. Check the number on your machine plate.

Model 330026 (chain drive) — illustration nos. 1–46

Scott Bonnar Model 330026 parts, illustration numbers 1 to 46
Illus. No. Description No. per Part No.
1 L.H. Sideframe 1 333390
2 R.H. Sideframe 1 331141
3 Front Roller Assy. 1 331176
4 Front Roller Shaft 1 331192
6 3/8″ Shakeproof Washer 2 3711208
7 Front Roller Bracket 2 191038
8 BRH Bolt 5/8″ x 5/16″ unf 8 191011
9 Hex Nut 5/16″ UNF 23 2321180
10 Brt Washer 5/16″ 14 3651180
11 Hex. Bolt 5/8″ x 5/16″ Unf 6 191070
12 5/16″ Spring Washer 17 3661186
13 Soleplate 1 331230
14 Bottom Blade 16″ 1 391620
15 Bottom Blade Screw 5 2071924
16 Deflector Assy. 1 331248
17 Cutter R.H. Brng. Hsng. Assy. 1 331301
18 Cutter L.H. Brng. Hsng. Assy. 1 331310
19 16″ x 6 Blade Assy. 1 331070
20 L.H. Brng. Hsng. Clamp Bolt 1 331344
21 Bright Washer ¼″ 2 3651164
22 Brng. Hsng. Pivot Bush 2 331037
23 5/16″ Ext. Shakeproof 6 3711180
24 Cutter Bearing 2 1127459
25 Cutter Bearing Shield 2 331061
26 L.H. Brng. Hsng. Cover 1 331352
27 Cutter Hsng. Purchase Block 2 331360
28 Cutter Adj. Screw (top) 2 331379
29 Cutter Adj. Screw (Bottom) 2 331359
30 Top Cutter Adj. Screw Locknut 2 331045
31 Cutter Sprocket Assy. 1 331387
32 Woodruff Key No. 6 5/8″ x 5/32″ 4 3802051
33 Locknut ½″ UNF 3 2441244
34 ½″ Flat Washer 3 3651243
35 Drum Assy. 2 333260
36 Drum Bush 2 3111119
37 Ratchet Box Assy. 14″ 2 454109
38 Ratchet Box Screw 6 3511025
39 Drum Dirt Shield 2 333286
40 Drum Pawl Holder 1 454133
41 Drum Pawl 6 333024
42 Pawl Holder Screw 1 3162520
43 Drum Bearing 2 1129017
44 Drum Bearing Shield Washer 2 331555
45 Drum Bearing Housing R.H. 1 331563
46 Drum Bearing Housing L.H. 1 331571
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Model 330026 (chain drive) — illustration nos. 47–95

Scott Bonnar Model 330026 parts, illustration numbers 47 to 95
Illus. No. Description No. per Part No.
47 Drum Bearing Housing Oil Clip R.H. 1 331580
48 Drum Bearing Housing Oil Clip L.H. 1 331598
49 Drum Bearing L.H. Hsng. Bolt Brt. Hex. ¾″ x 5/16″ UNF 2 331600
50 Drum Brng. R.H. Hsng. Bolt ¾″ x 5/16″ UNF 2 3182037
51 Drum Bearing L.H. Hsng. Retainer Clip 1 331619
52 Clutch Plate & Sprkt Assy (Bushed) 1 331627
53 Clutch Bush 2 3111176
54 Clutch Plate and Lining Assy. 1 331678
55 Clutch Lining 1 333032
56 Clutch Plate Shim 1 331694
57 Clutch Plate Boss (Fixed) 1 331707
58 Clutch Plate Shim 1 331723
59 Clutch Plate Clamp 3 331731
60 Clutch Ramp and Stirrup Assy. 1 331740
61 Clutch Thrust Race 1 3534032
62 Clutch Ball 1 3421182
63 Clutch Spacer 2 333497
64 Clutch Rod 1 191804
65 Hex. Nut ¼″ UNF 1 2321163
66 Clutch Rod S/Pin 7 3321811
67 Clutch Lever 1 403010
68 Clutch Wire Anchor Pin 1 454010
69 Pivot Retainer 1 1505122
70 Engine Clutch Thrust Pad 1 333112
71 Thrust Pad Spacer 1 333323
72 Engine Clutch Body 1 453835
73 Clutch Body Key 1 453843
74 Engine Clutch Outer Cone Assy. 1 451311
75 Engine Clutch Lining 1 453860
76 Outer Cone Screw 1 2084300
77 Washer — Shakeproof ¼″ Ext. 3 3711163
78 Engine Clutch Inner Cone 3 453878
79 Woodruff Key ¾″ x 3/16″ No. 9 1 3802267
80 Engine Clutch Thrust Race 1 3534016
81 Engine Clutch Spring 1 453886
82 Engine Shaft Clamp Pin 1 453894
83 Hex. Nut 3/8″ UNF 1 2321208
84 Spring Washer 3/8″ 3 3661204
85 Engine Shaft Bearing Housing 1 331846
86 Set Screw HT ¾″ x ¼″ UNF 1 3182289
87 ¼″ Spring Washer 3 3661160
88 Engine Shaft Bearing 3 1121204
89 Engine Shaft Bearing Shield 1 331854
90 Engine Shaft Bearing Circlip 1 1502354
91 7/16″ Bright Washer 1 331862
92 Engine Clutch Operating Box 1 333040
93 Hex. Nut 3/16″ 1 2481126
94 Shakeproof 3/16″ Int Washer 3 3691125
95 Engine Clutch Fork Assy. 3 331010
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Model 330026 (chain drive) — illustration nos. 96–137

Scott Bonnar Model 330026 parts, illustration numbers 96 to 137
Illus. No. Description No. per Part No.
96 Clutch Fork Pivot 1 333067
97 Engine Clutch Fork Spring 1 333091
98 Engine Clutch Fork Adj. Screw 1 173016
99 Engine Clutch Fork Pivot Retainer 2 2501028
100 Engine Clutch OP Lever Assy. 1 451320
101 Op. Lever Knob 1 2881016
102 Bright Washer 3/8″ 1 3651209
103 Op. Lever Cotter Pin 1 3321838
104 Chain Adj. Slide 1 453608
105 Chain Adj. Assy. 1 451258
106 L.H. Handle Assy. 1 33403
107 R.H. Handle Assy. 1 333411
108 Handle Bar Grip 2 403037
109 Handle Bar Mounting Bolt 4 191020
110 Handle Staybar 1 332072
111 Grassbox 1 333454
112 Chain Cover Assy. 1 333307
113 Chain Cover Nut 2 2531120
114 Chain Cutter 65 Rollers 1 2981653
115 Chain (Cutter/inter 42 Rollers) 1 2981420
116 Chain inter/drum 38 Rollers 1 2981385
117 Eng. Table Mntg. Bolt ¾″ x 5/16″ UNF H.T. 4 3182307
118 Engine — Kirby H4-4 1 6100619
119 Engine Table Assy. 1 332240
120 Op. Box Packer 1 333059
121 Op. Box Screw 3 2062260
122 Eng. Bolt Hex. 1½″ x 5/16″ UNF 4 1213807
123 Engine Shaft 1 333294
124 Throttle Control Lever 1 1601019
125 Throttle Cable Assy. 1 332339
126 Throttle Cable Clip 2 1411012
127 Engine Sprkt. Assy. 12 T. 1 332435
128 Drum Shaft Collar Locknut Hex. 5/16″ 1 2481183
129 Drum Shaft 1 333340
130 Drum Shaft Collar 1 333120
131 Drum Shaft Collar Screw 1 3162306
132 Drum Shaft Circlip 1 333366
133 Inter Sprkt. Cluster Bushed 1 331440
134 Inter Sprkt. Bush 2 3111021
135 Inter. Cluster Adj. Brkt. Assy. 1 331483
136 Inter Cluster Circlip 1 1505171
137 Clutch Washer 1 333500
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Model 330413 (belt drive) — illustration nos. 1–23

Scott Bonnar Model 330413 parts, illustration numbers 1 to 23
Illus. No. Description No. per Part No.
1 L.H. Side Frame 1 331117
2 R.H. Side Frame 1 331141
3 Frt. Roller 1 331176
4 Frt. Roller Shaft 1 331192
5 Frt. Roller Shaft Nut 2 2321208
6 Frt. Roller Shaft Washer 2 3651209
6 Oper. Lever Washer 1 3651209
7 Frt. Roller Spacer Washer 2 163811
8 Frt. Roller Brkt. 2 191038
9 Frt. Roller Brkt. Bolt 2 191011
9 Deflector Mntg. Bolt R.H. 1 191011
10 Frt. Roller Brkt. Nut 2 2321180
10 Soleplate Mntg. Nut 4 2321180
10 Deflector Mntg. Nut 2 2321180
10 Brng. Hsng. Pivot Nut 2 2321180
10 Purchase Block Nut 2 2321180
10 Adj. Bracket Nut 2 2321180
10 Drum Bearing Hsng. Nut 4 2321180
10 Tension Adj. Nut 1 2321180
10 Handle Pivot Clamping Nut 2 2321180
10 Handle Bar Mntg. Nut 4 2321180
10 Handle Stay Bar Nut 4 2321180
11 Frt. Roller Brkt. Washer 2 3651180
11 Deflector Mntg. Washer 2 3651180
11 Brng. Hsng. Pivot Washer 2 3651180
11 Adj. Brkt. Washer 2 3651180
11 Tension Adj. Washer 1 3651180
11 Handle Bar Mntg. Washer 4 3651180
11 Engine Mntg. Washer 4 3651180
12 Soleplate 1 331230
13 Soleplate Mntg. Bolt 4 1222707
14 Soleplate Mntg. Washer 4 3661186
14 Adj. Brkt. Lock Washer 2 3661186
14 Drum Brng. Hsng. Washer 4 3661186
14 Eng. Table Mntg. Washer 4 3661186
14 Eng. Mntg. Lock Washer 4 3661186
15 Bottom Blade 1 391620
16 Bottom Blade Screw 5 2071924
17 Deflector 1 331248
18 Deflector Mntg. Bolt L.H. 1 331299
19 Cutter Assy. 6 Blade 1 331070
20 Cutter Brng. Hsng. R.H. 1 331301
21 Cutter Brng. Hsng. L.H. 1 331310
22 L.H. Brng. Hsng. Clamp Bolt 1 331344
23 L.H. Brng. Hsng. Clamp Washer 1 3651164
23 Stirrup Pivot Washer 1 3651164
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Model 330413 (belt drive) — illustration nos. 24–63

Scott Bonnar Model 330413 parts, illustration numbers 24 to 63
Illus. No. Description No. per Part No.
24 Brng. Hsng. Pivot Bush 2 331037
25 Brng. Hsng. Pivot Bolt 2 191070
26 Pivot Bolt Lock Washer 2 3711180
26 Purchase Block Washer 2 3711180
26 Handle Pivot Clamping Washer 2 3711180
26 Handle Stay Bar Washer 4 3711180
27 Cutter Brng. 2 1127459
28 Cutter Brng. Shield 2 331061
29 L.H. Brng. Hsng. Cover 1 331352
30 Brng. Hsng. Purchase Block 2 331360
31 Cutter Adj. Screw (Top) 2 331379
32 Cutter Adj. Screw (Bott.) 2 331395
33 Top Adj. Screw Nut 2 331045
34 Cutter Sprkt. 12T. 1 331416
35 Cutter Sprocket Key 1 3802051
35 Drum Shaft Key 1 3802051
35 Eng. Shaft Key (Sprkt.) 1 3802051
36 Cutter Sprkt. Nut 1 2441244
37 Cutter Sprkt. Washer 1 3711242
37 Eng. Shaft Washer 1 3711242
38 Inter. Sprkt. Cluster W/- Bush 1 331440
39 Inter. Sprkt. Bush 1 3111058
40 Inter. Sprkt. Adj. Brkt. 1 331483
41 Inter. Cluster Washer 1 3651243
42 Inter. Cluster Circlip 1 [illegible]
43 Adj. Brkt. Bolt 2 191020
43 Tension Adj. Bolt 1 191020
43 Handle Bar Mntg. Bolt 4 191020
44 Drum Shaft 1 331512
45 Drum Shaft Collar 2 333120
46 Drum Shaft Collar Screw 2 3172301
47 Collar Screw Locknut 2 2481183
48 Drum 2 331520
49 Drum Ratchet Box 2 331539
50 Drum Pawl Holder 1 331547
51 Drum Pawl 6 333024
52 Pawl Holder Screw 1 3162306
53 Drum Oiler Screw 2 2051907
54 Drum Bearing 2 1129017
55 Drum Brng. Shield 2 331555
56 R.H. Drum Shaft Brng. Hsng. 1 331563
57 L.H. Drum Shaft Brng. Hsng. 1 331571
58 R.H. Drum Brng. Hsng. Oil Clip 1 331580
59 L.H. Drum Brng. Hsng. Oil Clip 1 331598
59 Eng. Shaft Brng. Hsng. Oil Clip 1 331598
60 L.H. Drum Brng. Hsng. Bolt 2 331600
61 R.H. Drum Brng. Hsng. Bolt 2 3182307
61 Eng. Table Mntg. Bolt 4 3182307
62 Drum Brng. L.H. Hsng. Retainer 1 331619
63 Drum R.H. Brng. Nut 1 2321242
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Model 330413 (belt drive) — illustration nos. 63–105

Scott Bonnar Model 330413 parts, illustration numbers 63 to 105
Illus. No. Description No. per Part No.
63 Clutch Plate Nut 1 2321242
63 Eng. Shaft Nut 1 2321242
64 Clutch Plate & Sprkt. Assy. (Bushed) 1 331627
65 Clutch Plate & Sprkt. Assy. Bush 1 3111176
66 Clutch Plate & Lining Assy. 1 331678
67 Clutch Lining 1 333032
68 Clutch Plate Shim (Light) 1 331694
69 Clutch Plate Shim (Heavy) 3 331723
70 Clutch Plate Boss (Fixed) 1 331707
71 Clutch Plate Clamp 1 331731
72 Clutch Ramp 1 331758
73 Clutch Rod Stirrup 1 191089
74 Clutch Stirrup Pivot 1 2921909
75 Clutch Thrust Race 1 3532047
76 Clutch Ball 2 3421182
77 Clutch Spacer 1 331766
78 Clutch Rod — To Machine No. 336190 1 191804
Top Clutch Rod — From Machine No. 336191 1 331774
79 Bottom Clutch Rod — From Machine No. 336191 1 331782
80 Clutch Rod Nut 2 2321163
80 Brng. Hsng. Nut 1 2321163
80 Eng. Clutch Adj. Lock Nut 1 2321163
81 Clutch Rod Conn. Plate 1 331790
82 Clutch Rod Cotter 3 3321811
83 Clutch Lever 1 403010
84 Clutch Lever Pivot 1 2932081
85 Lever Pivot Retainer 1 [illegible]
86 Clutch Lever Grip 1 191097
87 Engine Clutch Thrust Pad 1 333112
88 Eng. Clutch Thrust Washer 1 331803
89 Eng. Clutch Ring 1 331811
90 Eng. Clutch Bolt 3 2074304
91 Eng. Clutch Nut 3 2301162
92 Eng. Clutch Washer 3 3661160
92 Eng. Shaft Brng. Hsng. Washer 3 3661164
93 Eng. Clutch Cone 1 331820
94 Eng. Clutch Spring 1 331838
95 Eng. Clutch Thrust Race 1 3534016
96 Eng. Shaft Key (Cone) 1 3802267
97 Eng. Shaft Brng. Hsng. 1 331846
98 Brng. Hsng. Screw (Short) 2 3182289
99 Brng. Hsng. Screw (Long) 1 3183265
100 Eng. Shaft Brng. 1 1121204
101 Eng. Shaft Brng. Shield 1 331854
101 Jockey Pulley Dirt Shield 2 331854
102 Eng. Shaft Brng. Retainer 1 1502354
103 Eng. Shaft Spacer Washer 1 331862
103 Dirt Shield Spacer Washer 2 331862
104 Eng. Clutch Oper. Box 1 333040
105 Oper. Box Nut 3 2481126
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Model 330413 (belt drive) — illustration nos. 106–153

Scott Bonnar Model 330413 parts, illustration numbers 106 to 153
Illus. No. Description No. per Part No.
106 Oper. Box Washer 3 3691125
107 Eng. Clutch Fork 1 331010
108 Eng. Clutch Fork Pivot 1 333067
109 Eng. Clutch Fork Spring 1 333091
110 Eng. Clutch Pivot Retainer 2 2501028
111 Eng. Clutch Adj. Screw 1 173016
112 Eng. Clutch Oper. Lever 1 331870
113 Oper. Lever Knob 1 2881016
114 Oper. Lever Cotter 1 3321838
Belt Tension Pulley Assy. 1 331897
115 Belt Tension Plate 1 331900
116 Belt Jockey Pulley 2 331942
117 Jockey Pulley Spacer 2 331950
118 Jockey Pulley Brng. 2 1122028
119 Jockey Pulley Circlip 2 1502354
120 Jockey Pulley Nut 2 331969
121 L.H. Handle (One Piece) — To Machine No. 336190 1 332523
121 Top L.H. Handle — From Machine No. 336191 1 331977
122 R.H. Handle (One Piece) — To Machine No. 336190 1 332531
122 Top R.H. Handle — From Machine No. 336191 1 332013
123 Bottom Handle — From Machine No. 336191 1 332048
124 Handle Spacer Plate 2 332056
125 Handle Lower Stay Bar — To Machine No. 336190 2 332072
125 Handle Pivot Stay Bar — From Machine No. 336191 1 332064
126 Stay Bar Circlip 1 1505163
127 Handle Pivot Clamping Bolt 1 1212761
128 Handle Bar Grip 2 403037
129 Handle Stay Bar (Top) 2 332072
130 Grassbox 1 332099
131 Chain Cover 1 332179
132 Chain Cover Nut 1 2531120
133 Chain Cover Plug 2 3521012
134 Engine/Cutter Belt 1 3606333
135 Cutter/Inter. Chain 1 2981430
136 Inter./Drum Chain 1 2981385
137 Engine Table 1 332240
138 Eng. Clutch Oper. Box Packer 1 333059
139 Oper. Box Screw (Short) 1 2062260
140 Oper. Box Screw (Long) 2 2062724
141 Engine Mntg. Bolt 1 1213807
142 Engine Clutch Flange 4 332304
143 Crankshaft Taper Sleeve 1 191169
144 Taper Sleeve Nut 1 191177
145 Taper Sleeve Pin 1 191185
146 Engine Shaft 1 332312
147 Engine Shaft Pulley 1 332320
148 Cutter Pulley 1 331408
149 Throttle Control Lever Assy. 1 1601019
150 Sideframe Support Brkt. 1 332355
151 Throttle Cable Assy. 1 332339
152 Throttle Cable Clip 1 1411012
153 Engine Kirby HK25 1 6100045

Transcribed from the original Scott Bonnar / Flymo–Scott Bonnar parts book (Volume 2). The scanned pages in the viewer above are the authoritative source — if a number matters for an order, check it against the scan.

Page order: the source PDF is bound out of sequence — the 330026 list beginning at item 96 appears on its page 2, before the section that starts at item 1. The viewer above puts the pages back into reading order.

Two entries are unreadable. This copy carries a previous owner’s handwritten notes, and on the 330413 list they overlap the printed numbers for illustration 42 (Inter. Cluster Circlip, begins “1501…”) and illustration 85 (Lever Pivot Retainer, begins “2501…”). Rather than guess a part number, both are marked [illegible]. Illustration 13 (Soleplate Mntg. Bolt) is printed as 1222707 but struck through by hand in this copy, so treat it with caution.