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It is important to make a note of the bearing location on the top shaft to ensure correct placement of the new
bearings. Measure the distance from the edges of the bearings to the ends of the shaft and to the edge of
the sprockets. The better centered the sprockets are the smoother the belt will run. The bearings can only go
on one way. The collars must face the outside.
It is possible to rotate the top shaft to allow the unused side of the sprocket teeth to be in contact with the
conveyor belt chain, prolonging the life of the top shaft.
Loosen the set screws on the bearings and pull the bearings off the top shaft. It usually takes a bearing
puller to remove the bearings. Mark a centering hole on the shaft to keep the bearing puller straight. Clean,
file or sand any imperfections that will prevent the bearing replacement.
Put the new bearings on the top shaft. Do not tighten the bearings onto the shaft yet. Do not grease the
bearings yet. Replace the top shaft assembly into the take-up guides of the frame. This is a short two-man
step. Each person should be on the ends of the shaft. The first person should position one bearing into the
take-up guides and just start it down the guides. The second person should use a large screwdriver to help
position the second bearing into the take-up guides. When both sides are in the guides, let the top shaft
assembly drop all the way down the guides. A rubber hammer will help to get the shaft down the guides.
Center the shaft/sprockets so they are even on both sides. Tighten down the set screws when the top shaft
is centered.
Grease the bearings until grease is visible at the seals. Wipe off any excess grease. Any excess grease will
immediately have sand adhering to it creating a situation where abrasion will occur.
Replace the belt using the belt removal sequence in reverse.
3 ½” and 3 ¼” ROLLERS AND 8” IDLER ROLLERS INSPECTION AND ADJUSTMENT
There are four 3 ½” steel rollers, two3 ¼” rollers and four 8” poly rollers that support and guide the conveyor
belt on the 600HD. The 3 ½” and 3 ¼” rollers are used to support the conveyor chains. Two of the 8” poly
rollers support and guide the conveyor belt over the front of the bucket. The other two 8” poly rollers turn the
belt at the bottom of the machine, directing the belt toward the front main shaft and providing a plane of four
rows of tines that clean the sand. The internal components are the same for all rollers. Look for any wear on
the outside diameter/working surface of the roller. On the metal rollers there will be grooves from the contact
with the conveyor chains. If there are flats on the metal roller it must be replaced. To check for wear, loosen
the conveyor belt by backing off the adjusting bolts located on each side under the top shaft take-up
bearings. Take the weight off of the roller you are inspecting. Check for any wobbling or play. If there is play,
the bearings are worn but can be adjusted.
TO ADJUST THE IDLER ROLLERS:
Shims are used to compensate for wear. Remove the bearing from the
machine. Remove the external retaining ring and cover from the roller. Clean the grease away from the pin
and retaining ring. Remove the retaining ring off of the pin. Add shim(s) as necessary, replace retaining ring
and recheck for play. Repeat until the roller is tight on the pin. The rollers ride on tapered roller bearings. The
bearings will wear out prematurely if not adjusted for wear.
CHAIN CASE SPROCKETS AND CHAIN
The drive chain sprockets and chain will wear with use and need
to be adjusted periodically. Remove chain case cover and check chain tightness. There should be ½” play in
the chain, midway between the sprockets. Check the condition of the teeth of the sprockets. If they are worn
down to half their original thickness, they should be replaced. The chain should be replaced if the sprockets
are replaced.
TO ADJUST THE CHAIN CASE DRIVE CHAIN:
Loosen the take-up bolt and nut away from the motor base
plate. Slightly loosen the two motor mount bolts to allow the motor to slide. Tighten the take-up bolt until
there is ½” play in the drive chain. Re-tighten the motor mount bolts and the take-up nut. Re-check the chain
for correct tension. Only use dry film lubricant on the chain. Do not use grease or oil that will attract sand
and shorten the life of the components.
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