Alamo Schwarze SUPERVA C SUPER UPDRAFT, Product Manual

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Section 4 - Service
revised 04/19 SCHWARZE SUPER UPDRAFT
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Disassembly:
1. Raise the hopper and place the safety stops over the dump cylinders.
2. Remove the engine’s keys and disconnect the battery cables to prevent the engine from being accidentally
started.
3. Remove the 3/8” lock nuts and washers from around the back cover plate and lift it off.
4. Remove the 3/8” bolts and lock washers from the fan’s bushing.
5. Reinsert two 3/8” bolts into the tapped holes of the bushing. Tighten these bolts evenly. This will push the
fan off the bushing.
6. Use a gear puller to remove the bushing from the fan shaft.
7. Remove the fan from the fan shaft and fan housing.
8. While the fan is out, check the rubber liner inside the fan housing. If signs of excessive wear are apparent,
replace the liner. Failure to replace the relatively inexpensive liner could result in having to replace the
more expensive fan housing later.
Replacement:
1. Inspect the end of the fan shaft. Remove any burrs or rust from the shaft end with sandpaper.
2. Place the fan on the fan shaft and push it back into the fan housing.
3. Inspect the bushing. If the bushing is not cracked or otherwise damaged, the original bushing may be
reused.
4. Apply an anti-seize agent to the tapered area of the bushing.
5. Slip the key into the bushing/fan shaft keyway.
6. Position the fan bushing onto the fan shaft while aligning it with the shaft key as well as the fan. Spread the
bushing apart if necessary - remember, it will crack if it is overspread.
7. Drive the fan bushing onto the fan shaft until approximately 1/4” of the shaft extends from the face of the
bushing. (Use a rubber hammer or a wooden block and metal hammer to drive the bushing on.)
8. Insert the three 3/8” bolts with lock washers through the untapped bushing holes and into the tapped holes
of the fan. Finger tighten the bolts. Do not tighten the bolts so as to secure the fan to the fan shaft.
9. Apply strip caulk, or a similar sealing agent, to the face of the fan housing.
10. Install the back cover plate (it may be necessary to move the fan and its bushing further into the fan
housing before the back cover plate can be mounted). Tighten the cover plate bolts.
11. Move the fan back onto the fan shaft. Center the fan between the front and back of the fan housing.
12. Position the fan on the fan shaft, taking into consideration that, as the fan is tightened onto its bushing, it
will travel roughly 1/4” toward the cover plate’s orifice.
13. While holding the fan in position on the fan shaft, tap the fan bushing along the fan shaft and into the fan’s
hub.
14. When the fan bushing is snug inside the fan’s hub, insert the 3/8” bolts and tighten the fan onto the fan
bushing. As the bolts are tightened and the fan is drawn onto the bushing, the fan should move 1/4” toward
the cover plate.
15. Turn the fan to determine if it rubs the fan housing as it rotates. If the fan touches the fan housing, mark the
bushing’s present position on the fan shaft (so it may later be used as a reference point). Remove the fan
from its bushing and follow steps 12-16 to remount the fan further into the fan house. If the fan and fan
housing do not touch, proceed on to Step 16.
16. When the fan is properly mounted, swing the hopper safety prop into its stowed position and lower the
hopper. Start the auxiliary engine, and again, listen for sounds of contact between the cover plate orifice
and fan orifice. If none are audible, the unit is ready to sweep. If, however, sounds are detected, the hopper
should be raised and the fan readjusted.