7. MAINTENANCE HI ROLLER - BELT CONVEYORS
7.2. BELT TRACKING GUIDE HI ROLLER, MINI ROLLER, LO ROLLER & HI LIFE
84 P115506 R3
• Drive/gear reducers—see the manufacturer's recommendations for each
application. Extra instructions have been included in this manual if a drive/
gear reducer is supplied with the conveyor.
• Head, snubber, and tail shaft bearings—see the manufacturer's recom-
mendations for each application (included in the supplied with the con-
veyor).
• The idler bearing lubrication schedule will vary by model, size, and belt
speed. See Table 7.2 for idler shaft speeds.
Contact Hi Roller’s engineering department with any further questions.
Important: Over-greasing of any bearing will cause premature failure. It is important that
greasing follow the lubrication schedule.
7.2. BELT TRACKING GUIDE
BASIC RULES:
Important: Conveyor belt tension and tracking alignment must be checked weekly; more
often with seasonal weather changes.
• The basic and primary rule of tracking a conveyor belt is simple: the belt
moves toward the end of the roll it contacts first.
• The conveyor structure must be straight (relative to centerline) and level (side
to side).
• All pulleys, snub rollers, carrying idlers, and return idlers must be square with
the frame (perpendicular to belt centerline) and parallel to each other. Check
by measuring diagonals - they should be equal.
• Belt tension must be great enough to prevent slippage between the drive pul-
ley and the belt.
• Force the belt to conform to the crown on the crowned pulleys if they are
used.
Note: Belt should not be over-tensioned. Consult your belt manufacturer.
• Cleanliness is essential to good belt tracking. Foreign matter creates a new
roll or pulley face, adversely affecting tracking.
Table 7.2 Idler Shaft Speeds - Hi Roller Conveyors - All Models
Model Size Idler Dia.
rpm@350
Belt
Speed
rpm@700
Belt
Speed
Mini Roller All 4” 334 668
Lo Roller All 4” 334 668
Hi Bulk All 4” 334 668
Hi Roller 18” & 22” - Std. Idler 8-1/4” 162 324
Hi Roller 18” & 22” - HD Idler 8-1/2” 157 315
Hi Roller 26” & up - Std. Idler 8-1/4” 162 324
Hi Roller 26” & up - HD Idler 8-5/8” 155 310
Hi Life All 5-5/8” 238 475
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