17
2
12
4
6
7
10
9
14
11
8
16
1
3
15
Models 643 & 663
5
13
3
17
Ref.
No.
Part No. Part Description
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”