MTD 663 manual Models 643, Part Description

Models 643 & 663

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			11	17
			9
	16	13			8
1				15
			5	14	10
				6
	7				3
	12
			2	3
Ref.	Part No.		Part Description
No.
1.	618-0123		RH Housing
2.	618-0124		LH Housing
3.	710-0642		Self Tapping Screw, 1/4-20 x .75
4.	711-0910A		Spiral Axle, 28”
5.	714-0161		Hi-Pro Key, 3/16 x 5/8
6.	715-0143		Spring Spiral Pin, .25 x 1.25
7.	717-0528		Worm Gear, 20-tooth
8.	717-0526		Worm Shaft
9.	718-0186		Thrust Collar
10.	721-0325		Grease Plug
11.	721-0327		Grease Seal
12.	736-0351		Flat Washer, .76 x 1.5 x .030
13.	736-0369		Flat Washer, .508 x 1.0 x .020
14.	736-0445		Flat Washer, .76 x 1.5 x .060
15.	741-0662		Flange Bearing, .75 x 1.0 x .59
16.	741-0663		Flange Bearing, .503 ID x .75 OD
17.	618-0122A		Gear Ass’y Complete, 28”

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