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There are 20 rows on the belt. Count 10 rows or half way from where the belt is split. A lifting chain should
be hooked at or near this midpoint location on each side of the conveyor belt. This will allow the lowest
height necessary to lift the conveyor belt off of the machine.
When the lifting chain is fastened / hooked to the conveyor belt chain and enough tension is on the lifting
chain to prevent the conveyor belt from moving, remove the clamps that prevent the conveyor belt from
rolling off/down.
Lift the conveyor belt up/off of the top shaft of the machine.
Unbolt the top shaft take up assembly from each side of the machine. Loosen set screws from the bearings
and remove bearings from the top shaft.
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 onto the frame. Tighten the four bolts/nuts to secure the top
shaft.
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.
8” IDLER ROLLERS INSPECTION AND ADJUSTMENT
There are four 8” poly rollers that support and guide the conveyor belt on the 400. 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. 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.
SKID SHOES – SOLID BELT There are two skid shoes located underneath the conveyor belt on each side
and on the inside of the side frame. There are wear blocks on each end of the conveyor belt channels that
ride on the skid shoes. The skid shoes prevent the belt from sagging while elevating the picked up debris on
its way up to the hopper. The skid shoes are made of an abrasion resistant material and must be replaced
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