H
I
R
OLLER
- B
ELT
C
ONVEYORS
7. M
AINTENANCE
H
I
R
OLLER
, M
INI
R
OLLER
, L
O
R
OLLER
& H
I
L
IFE
7.2. B
ELT
T
RACKING
G
UIDE
P115506 R3
91
7.2.3. B
ELT
T
RACKING
- L
O
R
OLLER
& H
I
B
ULK
M
ODELS
Remember, squareness of the conveyor must be checked.
Idlers must be checked to be sure that they have not become loose during
shipping or installation. The idlers must be centered and the set screws tightened
on the shafts. Bearing retainer bolts holding the idlers on the outside of the
trunking must be checked for tightness. There is a pair of set screws on each
idler bearing. These set screws are on the bearing collar as shown in Figure 7.8.
Figure 7.8
H
EAD
& T
AIL
P
ULLEYS
Belt tracking is adjusted at the head and tail pulley by changing the position of
the pulleys. See “Head & Tail Pulleys” on page 86.
I
DLERS
Idlers may be adjusted only if attempts to train the belt with the head and tail
pulleys have failed. The conveyor must be square, level, in-line, belt splice must
be square, belt must be running on the flat part of the idler, and the load must be
centered on the belt. All of these must check out before attempting the train the
belt with the idlers.
1. Lo Roller and Hi Bulk idler adjustments are completed by loosening the two
bearing retainer bolts. (See Figure 7.8.) The idler bearing on the side that is
easiest to work on should be adjusted first. The nuts are welded to a nut
retainer plate. (See Figure 7.9.)
2. After loosening these bolts, the end of the idler can be shifted. Adjust 5-10
idlers in the middle of the conveyor about 1/4" - 3/8".
• If the belt is too close to the side of the bearing being adjusted, move the
bearing toward the head section. If the belt is too close to the opposite
side, move the bearing toward the tail section.
