Ariens 939 SNO-THRO 939001 - Manual (Page 31)

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10.1 ALUMINUM GEAR CASE
1. Remove auger/impeller and gear case from
housing (see Auger/Impeller Repair on page 27).
2. Remove six tapping screws that hold right and left
gear case halves together (Figure 28).
3. If flange bushings need replacement:
a. Remove oil seals from outside of gear case
halves with a screwdriver.
b. Very lightly, press flange bushings from
outside in with a bearing driver. Make sure the
flat on the flange of bushing fits in the inside
notch of the case.
c. Replace oil seals.
4. Check all internal parts for wear, and replace if
necessary.
NOTE: A woodruff key holds the worm gear on rake
shaft.
5. Slide bronze bushing off front of worm gear shaft.
Replace if necessary. A flat on the bushing flange
positions the bearing inside the gear case.
6. Replace the seal behind the rear bronze bushing. It
fits into a groove in gear case.
7. Replace the rear bushing if necessary. It is a larger
diameter than one in front, but it is identical in
design.
8. If thrust collar needs replacing, drive out groove pin
in direction of least resistance.
9. Inspect worm gear shaft for burrs or black
coloration. If either show up, replace shaft.
SECTION 10 - GEAR CASE
1 2
3 4 5 6
8
9
10
11
12
13 14
15 16
17
18 19 20
21
22 23
24
25
26
27
29
30
7
1. Bolt w/Lock Washer
2. Pulley
3. Bearing Flange
4. Ball Bearing
5. Bearing Flange
6. Impeller (12 in.)
7. Groove Pin
8. Oil Seal
9. Flange Bushing
10. Thrust Collar
11. Shaft and Worm Gear
12. Flat Washer
13. Oil Seal
14. Gear Case (Left Hand)
15. Flange Bushing
16. Flat Washer
17. Sleeve Bushing
18. Gear
19. Flat Washer
20. Flange Bushing 21. Gear Case (Right Hand)
22. Oil Seal
23. Tapping Screw (typical of 6)
24. Flat Washer
25. Flange Bushing
26. Woodruff Key
27. Auger Shaft
28. Gear Case Assembly
29. Loctite Gasket 518
30. L2 Lube (16 oz)
28
Figure 28
PS0381