Auger Gearbox Service
AUGER GEARBOX DISASSEMBLY / SERVICE
Once the auger gearbox assembly is removed from the housing the repair process is the same for all models. The only variables are what type of lubricant is used (see the chart on Introduction page 1), whether the impeller is removable from the shaft (on some models the impeller is welded to the shaft) and how the gearbox case halves are sealed.
Auger gearbox disassembly:
1.With the gearbox assembly removed from the housing the first step is to slide the bearings off the output shafts. (Model 38080 & 38065, also slide the scraper off).
2.All models use a cap screw, lock nut, and spacer to connect the auger to the shaft (Figure 22). Remove the cap screw, nut and spacer and slide both augers from the shaft.
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Figure 22 | ||
3.Some models have the impeller welded to the impeller shaft. Others use a combination of bolts, set screws, and a key. If you see bolt(s) through the impeller hub, remove them. Some may have set screws, which only require being loosened. The models with the setscrews also have a key between the hub and shaft. Once the visible retainers are removed, slide the impeller away from the gearbox, the key will be uncovered. Remove the key (Figure 23).
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Figure 23 | ||
4.Remove the 8 or 9
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Figure 24 |
5.The impeller shaft can now be removed (Figure 25).
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Figure 25 | ||
Two Stage Snowthrower Drive Systems Manual | 1 - 7 |