PARTS LIST

BOOM PARTS - MODEL TB490BC 4-CYCLE GAS TRIMMER

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Item

Part No.

Description

 

 

12

 

 

7

1

791-00040

Throttle Housing Assembly (includes 2-4)

13

2

791-00041

Throttle Trigger Lock-Out

 

 

14

3

791-00042

Throttle Trigger

 

 

 

 

 

4

791-182690

Throttle Trigger Spring

 

 

15

5

791-182405

Switch

 

 

6

791-610327

Harness Clip

 

 

 

7

753-04503

Upper Drive Shaft Housing Assembly

 

20

 

 

 

 

 

8791-181099 J-Handle Assembly

9791-683295 Handle Bracket Assembly (includes 10-15)

10

791-181811

Screw

 

11

791-181812

Upper Handle Clamp

 

12

791-181813

Middle Handle Clamp

39

13

791-181814

Lower Handle Clamp

 

14

791-181815

Nut

 

15

791-145569

Anti-Rotation Screw

 

16

753-1190

Split Boom Coupler (includes 17-20)

38

17

791-182057

Screw

 

18

791-181617

Bolt

 

19

791-181981

Adjustment Knob

 

20753-04386 Knob Retaining Nut

21791-182541 Lower Drive Shaft Housing Assembly

22

791-613300

Lower Flexible Drive Shaft

39

23791-182200 Shield Mount Screw Assembly

24791-182193 2 piece Gearbox Assembly (includes 25-35)

25

791-182195

Gearbox Mounting Hardware

46

26

791-145569

Anti-Rotation Screw

 

27

791-182192

Right Housing

 

28

791-182191

Left Housing

 

29791-182194 Pinion Gear Assembly

30791-182199 Output Shaft Bushing

31791-182198 Output Shaft Gear

32

791-182197

Output Shaft Assembly (includes 30 & 31)

35

33

791-182196

Blade Driver

 

34

753-04348

Palnut

48

35

791-147490

Retaining Washer

 

36791-147492 Blade Shield/Shield Mount

37791-683304 Shield Mounting Screw

38753-1191 Shield Assembly (includes 39)

39

791-682061

Blade Assembly

40

791-612483

Spool Shaft

41791-683301 Outer Spool Assembly (includes 42)

42791-612026 Retainer

43791-610636B Spring

44

791-147495

Inner Reel

45

791-180814B

Bump Head Knob Assembly

46

791-145873B

4-Tooth Blade

48

791-181699

Nut

*791-180014B Blade Retaining Kit (includes 34 & 43)

*791-613226 Locking Rod Tool

*791-682075B Shoulder Harness

*Items Not Shown

 

 

 

30

 

 

29

31

8

 

 

25

25

 

 

 

 

 

 

 

 

28

9

26

 

32

 

 

 

27

34

33

 

 

17

18

19

26

16

2123

22

37

25

24

26

29

23

35

40

41

42

43

44

45

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