MTD 2079r User Manual

PPN- Parent Part Number

Unit Serial Decal

SN- Serial Number

MDL- Unit Model

Reissued 4/00

ENGINE PARTS - MODEL 2079r

2-CYCLE GAS TRIMMER

(Serial Number 901180006 and greater)

46

38

39

36

37

35

34

67

70

69

18

19

16

15

14

43

42

14

25

20

30

29

28

27

49

53

56

51

48

6

57

49

54

55

52

50

7

12

13

71

10

9

8

11

1

5

47

63

62

33

31

65

58

64

66

59

61

60

32

26

4

24

17

16

24

22

2

3

21

23

45

44

72

68

41

40

Item Part

No. Description

40 181742 Rope
41 181743 Pull Handle
42 182118 Pulley Assembly
43 181745 Ratchet
44 181746 Spring
45 181747 Retaining Ring
46 181716 Screw
47 181748 Throttle Bracket
48 181749 Carburetor (includes Primer Bulb)
49 181750 Screw
50 181751 O-Ring
51 181752 Air Cleaner Assembly (includes 52 thru 55)
52 181753 Sleeve
53 181754 Choke Plate
54 181755 Choke Lever
55 181756 Screw
56 181757 Air Filter
57 181758 Air Cleaner Cover
58 181967 Clutch Housing Assembly
59 181760 Engine Bolt
60 181761 Nut
61 181762 Screw
62 181968 Engine Cover
63 181716 Screw
64 181764 Screw
65 181765 Spark Plug
66 181629 Anti-Rotation Screw
67 181774 Fuel Tank (includes 68 thru 70)
68 180000 Fuel Cap Assembly
69 181767 Fuel Line Assembly
70 181768 Screw
71 181769 Lead Wire Assemby
72 612468 Compression Spring

* 181701 Primer Bulb
* 181702 Carburetor Repair Kit
* 181703 Gasket/Diaphragm Repair Kit

* not shown

Item Part No. Description

1 181704 Cylinder
1 182012 Cylinder (PPN: 501458 only)

2 181705 Cylinder Base Gasket
3 181706 Bolt
4 181707 Insulator
5 181708 Insulator Gasket
6 181709 Carburetor Gasket
7 181710 Screw
8 181711 Muffler Assembly (includes 9 & 10)

9 181712 Muffler
10 181713 Screw
11 181714 Muffler Gasket
12 181715 Muffler Plate
13 181716 Screw
14 181717 Crankcase Service Assembly

(includes 15 thru 19 & 25)
15 181718 Crankcase Gasket
16 181719 Bearing
17 181720 Oil Seal
18 181721 Oil Seal
19 181722 Snap Ring
20 181723 Screw

21 181724 Piston
21 182013 Piston (PPN: 501458 only)
22 181725 Ring
22 182014 Ring (PPN: 501458 only)
23 181726 Piston Pin
23 182015 Piston Pin (PPN: 501458 only)

24 181727 Snap Ring

25 181728 Crankshaft
25 182016 Crankshaft (PPN: 501458 only)

26 181729 Key
27 181730 Clutch Rotor
28 181074 Clutch Washer
29 181731 Spacer
30 181732 Flywheel Assembly
31 181733 Module Assembly (includes 32 & 33)
32 181734 Spacer
33 181735 Screw
34 181777 Recoil Assembly (includes 35 thru 41)
35 181737 Recoil Case
36 181738 Recoil Pulley
37 181739 Recoil Spring
38 181740 Screw
39 181741 Washer

Item Part No. Description

1 180866 Grip
2 181688 Throttle Cable Assembly
3 180975 Throttle Trigger
4 610314 Throttle Trigger Spring
5 181689 Throttle Trigger Assembly (includes 4)
6 180252 Switch Assembly
7 181690 Wire Lead Assembly
8 181969 Upper Drive Shaft Housing Assembly

9 610327 Shoulder Harness Clamp
10 180869 Loop Handle Assembly (includes 11-14)
11 181838 Screw
12 182167 Loop Handle
13 182168 Bottom Clamp
14 181810 Nut
15 181616 Click-Link Coupler (includes 16-19)
16 182057 Screw
17 181617 Bolt
18 181618 Adjustment Knob
19 181886 Knob Retaining Nut
20 181972 Lower Drive Shaft Housing
21 181570 Drive Shaft

22a 147539 Shield Mount Screw Assembly (1 piece Gearbox)
22b 182200 Shield Mount Screw Assembly (2 piece Gearbox)

23 182189 Shield and Blade Assembly
24 682061 Blade Assembly

25a 147677 Gearbox Mounting Hardware and

Grease Plug (1 piece Gearbox)

25b 182195 Gearbox Mounting Hardware (2 piece Gearbox)

26 145569 Anti-Rotation Screw (2 piece Gearbox)

27a 147488 1 piece Gearbox Assembly (includes 25a & 28a)
27b 182193 2 piece Gearbox Assembly (includes 25b & 28b)
28a 147489 Blade Driver (1 piece Gearbox)
28b 182196 Blade Driver (2 piece Gearbox)

29 612483 Spool Shaft
30 683301 Outer Spool & Eyelet Assembly
31 612026 Retainer
32 610636 Spring
33 147495 Inner Reel
34 180814 Bump Head Knob Assembly

2 Piece Gearbox Assembly Parts – Item 27b

35 182191 Left Housing
36 182192 Right Housing
37 182194 Pinion Gear Assembly
38 182199 Output Shaft Bushing
39 182198 Output Shaft Gear
40 182197 Output Shaft Assembly (includes 38 & 39)

Optional Accessories

* 612454 Replacement Line, 0.095 Diameter
* 147345 Reel and Line Assembly
* 147498 Bump Head Assembly (includes 29-34)
* 147543 Ryobi 2-Cycle Motor Oil
* 682075 Shoulder Harness
* 300026 Brush Cutter Accessory Kit

* Items Not Shown

Reissued 4/00

BOOM AND TRIMMER PARTS - MODEL 2079r
2-CYCLE GAS TRIMMER

(Serial Number 901180006 and greater)

5

2

1

5

6

7

11

12

9

8

14

4

3

13

10

17

16

18

15

19

20

21

27

24

24

25a

25b

28a

22a

22a

27a

26

23

28

29

31

30

32

33

34

38

39

35

36

26

37

40

28b

25b

27b

25b

22b

22b