HI ROLLER - BELT CONVEYORS 7. MAINTENANCE
HI ROLLER, MINI ROLLER, LO ROLLER & HI LIFE 7.5. LINER - BOTTOM RETURN PAN
P115506 R3 105
• This liner is not tightly fastened to the bottom which allows the UHMW
liner to expand and contract at a different rate than the steel bottom. The
UHMW has a much greater expansion and contraction rate than steel.
The steel bottom has slotted holes that will allow the liner to move. There-
fore, the UHMW liner must not be tightly fastened to the bottom (Figure
7.28). The bottom return pan has slotted holes that allow the liner to
move. See Figure 7.28.
• Liner replacement requires that all of the bolts, washers, and nuts first be
removed and discarded.
• Remove the worn out liner.
• Clean and treat any bare metal areas as required.
• Install the new liner in its proper place so that the holes line up with the
holes and slotted holes in the bottom return pan.
• Install all new bolts, washers, and locknuts. The locknuts should be tight-
ened and then backed off so that the bolt spins freely.
• The locknuts MUST NOT be tight!
• Liner joints must be level from trunking section to trunking section. This is
very important so that the return belt with splice protector / wiper cleats
does not catch on these joints.
Figure 7.26
LINER PAN WITH BOLTS (TRUSS
HEADS), WASHERS (FENDER), AND
LOCKNUTS (NYLON)
VIEW FROM UNDER BOTTOM
RETURN PAN
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