MTD TB490BC User Manual

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Reissued12/01

ENGINE PARTS - MODEL TB490BC

4-CYCLE GAS TRIMMER

(ppn - 41ADT49C063) (Serial Number 011...... and greater)

Part Numbers On Following Page

36A

36B

22B

22A

62

ENGINE PARTS - MODEL TB490BC
4-CYCLE GAS TRIMMER

(ppn - 41ADT49C063) (Serial Number 011...... and greater)

Reissued 12/01

Item Part No. Description

47 791-181247 Palnut
48 753-1199 Recoil Pulley
49 791-613102 Recoil Spring
50 791-182366 Nut Clip
51 791-181079 Pull Handle
52 791-611061 Rope Guide
53 791-613103 Rope
54 791-181020 Starter Housing Screw
55 753-1237 Starter Housing Assembly

(includes 49-56)
56 791-182368 Clutch Washer
57 753-1238 Clutch with Spacer
58 791-153592 Clutch Drum
59 753-1239 Clutch Cover
60 791-145569 Anti-Rotation Screw
61 753-1240 Screw
62 753-1241 Nut
63 791-181345 Clutch Cover Screw
64 791-182725 Ignition Module with Screws
65 791-181065 Spacer
66 791-181867 Flywheel
67 791-182743 Shroud Assembly with Screws
68 753-1244 Crankcase Assembly

(includes 69-73)
69 791-610309 Oil Seal
70 791-182372 Bearing
71 791-182380 Crankshaft
72 791-182375 90° Elbow
73 791-182379 Breather Hose
74 791-181015 Cam Gear
75 753-1242 Cam Follower Set
76 791-181013 Cam Bracket
77 791-181012 Cam Bracket Screw
78 791-181040 Valves, Intake and Exhaust
79 791-182374 Cylinder Gasket
80 791-181018 Oil Pan Gasket
81 791-182377 Oil Pan (includes 80 & 82)
82 791-181020 Oil Pan Screw
83 791-182378 Dipstick Assembly (includes 84)
84 791-182290 O-Ring
85 791-181009 Connecting Rod
86 791-181008 Wrist Pin Button
87 753-1243 Piston
88 791-181006 Wrist Pin
89 791-182295 Piston Ring Set
90 791-182409 Washer
91 791-181861 Screw
92 791-612468 Compression Spring
93 791-182537 Grommet

* 791-180852B Spark Plug
* 753-1245 Short Block Assembly

(includes 3-7, 68-89)

* 791-182745 Cylinder Assembly

(includes 9, 12, 14 & 79)

* 791-180142 Starter Pawl Repair Kit
* 791-182156 Carburetor Repair Kit
* 753-1248 Gasket Diaphragm Repair Kit

* Parts not shown

Item Part No. Description

1 791-182338 Engine Cover
2 791-182339 Engine Cover Screws
3 791-181025 Valve Cover Screw
4 791-182098 Valve Cover
5 791-182099 Valve Cover Gasket
6 791-182340 Rocker Adjustment Nut
7 791-182101 Rocker Arm Pivot
8 791-182100 Rocker Arm

9 791-182341 Rocker Arm Stud
10 791-182103 Valve Spring Retainer
11 791-181038 Valve Spring
12 791-182102 Push Rod Guide
13 791-181033 Push Rod
14 791-182700 Cylinder Head (includes 9 & 12)
15 791-182344 Cylinder Screw
16 791-182345 Intake Baffle
17 791-182749 Carburetor Mount Gasket
18 791-181034 Nut
19 791-182347 Carburetor Mount (includes 18)
20 791-182348 Carburetor Mount Screw
21 791-182732 Carburetor Gasket

22A 791-182654 Carburetor with Primer
22B 753-1225 Carburetor with Primer

23 791-181751 O-Ring, Carburetor
24 753-1227 Air Filter/Choke Cover Assembly

(includes 27 & 28)
25 791-182097 Breather Tube
26 791-181750 Air Filter Mounting Screw
27 791-181757 Air Filter
28 753-1228 Air Filter Cover
29 753-1229 Fuel Cap
30 791-182352 Fuel Return Line
31 791-182353 Fuel Pick-Up Line with Filter
32 791-181080 Screw
33 791-182354 Washer
34 753-1230 Fuel Tank Assembly (includes 29-31)
35 791-182356 Fuel Tank Shield

36A 753-1234 Throttle Cable
36B 753-1231 Throttle Cable

37 791-182358 Muffler Baffle
38 791-181048 Muffler Gasket
39 791-182359 Muffler (includes 40, 42-44)
40 791-180890 Spark Arrestor Screen
41 791-181045 Screen Cover
42 791-181046 Screw
43 791-182360 Muffler Shield
44 791-182361 Muffler Mounting Screw
45 791-182362 Muffler Cover
46 791-182804 Switch Wire Assembly