Simplicity S28BC, 28cc Straight Shaft Trimmer Manual

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Simplicity S28BC, 28cc Straight Shaft Trimmer Manual | Manualzz

Mfg. No: 7800958-00

S28BC, 28cc Straight Shaft Trimmer

Copyright © Briggs & Stratton. All Rights reserved

22-Jul-2021

Engine Group. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Shaft Group. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Torque Specification Chart. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

10

4

8 or

Not F

Reproduction

Copyright © Briggs & Stratton. All Rights reserved

3 22-Jul-2021

Note: Unless noted otherwise, use the standard torque specifications Mfg. No: 7800958-00 or

Not F

Reproduction

Copyright © Briggs & Stratton. All Rights reserved

4 22-Jul-2021

15

16

17

18

23

24

25

26

19

20

21

22

27

28

29

30

31

32

33

34

35

36

41

42

43

37

38

39

40

3

4

1

2

5

6

7

8

9

10

11

12

13

14

QTY DESCRIPTION

705528

705452

705532

-----

705536

705508

-----

705453

-----

-----

-----

-----

705513

705511

-----

705525

-----

705533

-----

----Not F

-----

-----

-----

705515

-----

705524

705526

705507

705537

705510

705510

705446

705517

-----

705534

705451

705521

705544

705505

705506

705512

705449

Filter

Nut - Carb. Screw

Lever - Choke

Bulb - Purge

Kit - Carb. Gasket

-(Incl. Ref. No. 7) (Included with Ref. No. 63)

Adaptor - Carb.

Foam - Gasket

-(Incl. Ref. No. 5) (Included with Ref. No. 63)

Bolt

Plug - Spark, RCJ-8Y

Seal - Cylinder

-(Included with Ref. No. 63)

Seal - Crankshaft

-(Included with Ref. No. 63)

Assy - Starter Pawl

Assy - Fuel Filter

Kit - Fuel Line

-(Included with Ref. 15)

Fitting - Fuel line

Assy - Cap w/ret.

-(Incl. Ref. No. 17)

O-ring or Reproduction

Kit - Fuel Tank Assy.

-(Incl. Ref. Nos. 14, 15, 16 & 17)

Housing - Starter

Screw

Kit - Rope

Handle - Starter

Screw

Screw

Kit - Spring

Kit - Starter Pulley

Spring - Driver

Pulley - Driver

Screw

Kit - Starter Housing

-(Incl. 19, 22, 25-29)

Bolt

Bolt

Screw

Kit - Spark

-(Incl. Ref. No. 33)

Gasket

-(Included with Ref No. 36 & 63)

Kit - Muffler

-(Incl. Ref. Nos. 31-35)

Screw

Module

Assy - Leadwire

Screw

Washer

Washer - Clutch

Screw

5

Copyright © Briggs & Stratton. All Rights reserved

22-Jul-2021

Note: Unless noted otherwise, use the standard torque specifications Mfg. No: 7800958-00 or

Not F

Reproduction

Copyright © Briggs & Stratton. All Rights reserved

6 22-Jul-2021

58

59

60

61

62

63

52

53

54

55

56

57

48

49

50

51

44

45

46

47

64

-----

-----

-----

-----

-----

-----

705448

705447

705505

705529

705523

705543

-----

-----

-----

705451

705539

705527

705531

705538

705768

Not F

QTY DESCRIPTION

Screw

Nut

Screw

Assy - Fan Housing

Assy - Clutch Drum

Assy - Clutch

Spacer

Flywheel

Crankcase - Cast

Bearing

Assy - Crankshaft

Retainer - Piston Pin

Ring - Piston

Kit - Piston/Cyl.

-(Incl. Ref. Nos 55 & 56)

Seal

-(Included with Ref. No. 63)

Screw

Kit - Carb.

-(Incl. Ref. Nos. 3, 4 & 5)

Housing, Filter

Cover - Filter Housing or Reproduction

-(Incl. Ref. No. 5, 7, 10, 11, 17, 35 & 58)

Kit - Decal

Copyright © Briggs & Stratton. All Rights reserved

7 22-Jul-2021

Note: Unless noted otherwise, use the standard torque specifications Mfg. No: 7800958-00 or

Not F

Reproduction

Copyright © Briggs & Stratton. All Rights reserved

8 22-Jul-2021

1

13

14

15

16

9

10

11

12

17

18

7

8

5

6

2

3

4

19

20

31

32

33

34

28

29

30

35

36

37

--

25

26

27

21

22

23

24

QTY DESCRIPTION

-----

-----

-----

705556

705553

705557

705552

705547

705558

706496

-----

-----

-----

-----

705449

-----

-----

-----

-----

-----

705548

705554

705559

705555

705561

705560

705549

705541

705530

-----

705542

705562

-----

705564

705563 Not F

705546

705565

Assy - Throttle Housing

-(Incl. Ref. No. 2-9)

Assy-Cable/Wire Harness

Housing-Throttle, RH

Screw

Screw

Spring-Trigger

Trigger

Lockout-Throttle

Housing-Throttle, LH

Kit-Switch

Screw 10-14 x 13/16

Clamp - Bracket

Clamp - Handlebar

Kit - Handlebar

Clamp - Upper Harness

Clamp - Lower Harness

Screw - 10-14 x .095

Assy-Driveshaft Upper

-(Incl. Ref. 19, & flex)

Kit - Knob / Screw or Reproduction

Flexshaft - Lower

Wingnut

Bracket - Shield

Gearbox

Screw - 12-24 x .960

Screw - 8-16 x .593

Kit-Shield

-(Incl. Ref. No. 28, 29 & 30)

Limiter - Line

Screw - 10-14 x 3/4

Bolt

Dust cup

Assy. - Blade

Washer

Washer - Belleville

Nut - Flange, LH

Head - Cutting

Shoulder Strap

Manual

Copyright © Briggs & Stratton. All Rights reserved

9 22-Jul-2021

Hardware Identification & Torque Specifications

Torque Specification Chart

FOR STANDARD METRIC MACHINE HARDWARE (Tolerance ± 20%)

Torque Specification Chart

FOR STANDARD MACHINE HARDWARE (Tolerance ± 20%)

0

Property

Class

5.6

8.8

10.9

12.9

Class 5.6

Class 8.8

Class 10.9

Class 12.9

Size Of

Hardware in/lbs ft/lbs Nm.

in/lbs ft/lbs Nm.

in/lbs ft/lbs Nm.

in/lbs ft/lbs Nm.

M12

M14

M16

M18

M20

M22

M24

M27

M3

M4

M5

M6

M7

M8

M10

M30

M33

M36

M39

5.88

.56

13.44

1.28

26.4

2.50

44.64

4.3

5.2

7.1

7.7

10.5

15

26

21

36

42 58

64 88

89 121

126 171

169 230

217 295

320 435

435 590

590 800

759 1030

988 1340

13.44

30.72

60.96

7.3

12.1

17.7

35

61

101

147

202

290

390

497

733

995

1349

1740

2249

1.28

2.90

5.75

9.9

16.5

24

48

83

132

200

275

390

530

375

995

1350

1830

2360

3050

1032

1401

1902

2441

3163

287

405

559

708

19.2

43.44

5.97

10.3

16.9

25

50

86.2

136

210

550

745

960

1400

117

185

285

390

1.80

4.10

8.10

14

23

34

67

1900

2580

3310

4290

22.92

2.15

52.56

4.95

7.15

9.7

12.1

16.5

19.9

29

59

27

40

81

103 140

162 220

250 340

346 470

486 660

656 890

840 1140

1239 1680

1681 2280

2278 3090

2935 3980

3798 5150

The guides and ruler furnished below are designed to help you select the appropriate hardware.

10 20 30 40 50 60 70 80 90 100

Nut, M8

Body

Diameter

Body Length

Screw, M8- 1.25 x 25

0

Thread

Diameter (mm)

Inside

Diameter (in)

Threads per inch

1/4

Nut, 1/2-16

1/2

3/4

1

1/4

Thread

Diameter (mm)

Body

Diameter

1/2

3/4

Distance between threads (mm)

Threads per inch

Body

Length (mm)

Body

Length (in)

2

Screw, 1/2- 16 x 2

1/4

1/2

3/4

3

1/4

1/2

3/4

4

Hardware

Grade

No

Marks

SAE Grade 2

Size Of in/lbs

Hardware ft/lbs Nm.

SAE Grade 5 in/lbs ft/lbs Nm.

SAE Grade 8 in/lbs ft/lbs Nm.

8-32

8-36

10-24

10-32

1/4-20

1/4-28

5/16-18

5/16-24

3/8-16

3/8-24

7/16-14

7/16-20

1/2-13

1/2-20

9/16-12

9/16-18

5/8-11

5/8-18

3/4-10

3/4-16

7/8-9

7/8-14

1-8

1-12

19

20

27

31

66

76

140

7.6

8.6

11 15.0

12

20

23

30

35

50

55

65

75

90

100

160 217.6

180 244.8

155

220

240

2.1

2.3

3.1

3.5

16.3

27.2

31.3

40.8

47.6

68.0

74.8

88.4

102.0

122.4

136

190.4

210.8

299.2

326.4

30

31

43

49

8

19

30

35

50

55

75

90

110

3.4

3.5

4.9

5.5

10.9

10 13.6

17 23.1

25.8

40.8

47.6

68.0

74.8

102.0

122.4

149.6

41

43

60

68

12

14

25

29

45

50

70

34.0

61.2

68.0

95.2

80 108.8

110 149.6

120 163.2

150 204.0

4.6

4.9

6.8

7.7

16.3

19.0

34.0

120 163.2

150 204.0

180 244.8

260 353.6

300 408.0

170

220

240

231.2

299.2

326.4

386 525.0

420 571.2

400 544.0

440 598.4

600 816.0

660 897.6

580 788.8

900 1,244.0

640 870.4

1,000 1,360.0

NOTES

1. These torque values are to be used for all hardware excluding: locknuts, self-tapping screws, thread forming screws, sheet metal screws and socket head setscrews.

2. Recommended seating torque values for locknuts: a. for prevailing torque locknuts - use 65% of grade 5 torques.

b. for flange whizlock nuts and screws - use 135% of grade 5 torques.

3. Unless otherwise noted on assembly drawings, all torque values must meet this specification.

Common Hardware Types

Hex Head Capscrew

Washer

Standard Hardware Sizing

When a washer or nut is identified as 1/2” (M8), this is the Nominal size , meaning the inside diameter is 1/2 inch

(8mm metric thread diameter); if a second number is present it represents the threads per inch (distance between threads).

When bolt or capscrew is identified as 1/2 - 16 x 2” (M8 - 1.25 x 50), this means the Nominal size , or body diameter is 1/2 inch (8mm metric thread diameter), the second number,16, represents the threads per inch, (distance between threads). The final number is the body length of the bolt or screw, 2 inches (50mm).

Carriage Bolt

Wrench & Fastener Size Guide

Lockwasher

Hex Nut

1/4” Bolt or Nut

Wrench—7/16”

M6 Bolt or Nut

Wrench—10mm

5/16” Bolt or Nut

Wrench—1/2”

M8 Bolt or Nut

Wrench—13mm

3/8” Bolt or Nut

Wrench—9/16”

M10 Bolt or Nut

Wrench—17mm

7/16” Bolt or Nut

Wrench (Bolt)—5/8”

Wrench (Nut)—11/16”

1/2” Bolt or Nut

Wrench—3/4”

M12 Bolt or Nut

Wrench—19mm

M14 Bolt or Nut

Wrench—22 mm

Copyright © Briggs & Stratton. All Rights reserved

22-Jul-2021

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