Auger Gearbox Service
3.Insert the keys into the shaft and slide the large worm gear into place. Note: There is a large letter “R” and an arrow on one side of the gear. This gear MUST be installed such that the R and the arrow are on the right hand side and the arrow is pointing forward (Figure 30). This is a two piece gear that is bonded together. If it is installed backwards, the forces try to separate the gear and can result in failure.
1 
|
|
|
Figure 30 | 30 | |
1. Letter “R” and arrow
4.Install the thrust washers and slide the case halves on. Note the direction to keep the markings on the gear on the right side.
5.There are two versions of the impeller shaft. One has the worm separate and the other has the worm as part of the impeller shaft.
6.On models with worm separate from the impeller shaft — Assemble the parts on the impeller shaft. From the inside out, the order is as follows: seal, bushing, thrust washer, thrust bearing, thrust washer, key, worm, thrust washer, retaining ring (sharp edge towards the front) and bushing (Figure 31).
|
|
| |
| Figure 31 | ||
1. | Bushing | 7. | |
2. | 8. | ||
3. | 9. | ||
4. | Gear | 10. | |
5. | 11. | ||
6. |
|
| |
On models with worm integral with the impeller shaft — This version is assembled starting on the end opposite the worm. Start with the snap ring (sharp edge towards the rear), thrust washer, thrust bearing, thrust washer, bushing and seal. There is also a bushing on the worm end of the shaft (Figure 32).
|
|
|
|
| Figure 32 | ||
1. | Impeller shaft | 4. | |
2. | 5. | ||
3. | 6. | ||
1 - 10 | Two Stage Snowthrower Drive Systems Manual |