Page 26 - Goodyear2011PTMaintenanceManual

26
Variable Speed
INSTALLATION GUIDE
INSPECT SHEAVES
The following sections outline installation procedures that will
ensure maximum life and performance for your Variable Speed
belts.
Check sheaves for cleanliness, damage, and wear whether you
are replacing an existing belt, performing routine maintenance, or
installing a new drive.
Worn sidewalls also interfere with the shifting action. Nicks or
gouges can cut the belt. Dirt on the belt and in the grooves can
abrade the belt and oil can attack the belt materials. Use a stiff
brush to clean off rust and dirt. Wipe off any oil and grease. Worn
moving parts cause vibration and reduce belt life.
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1 CHECK ALIGNMENT
Proper alignment is more critical for Variable Speed Drive
sheaves than for conventional V-belt drives. Check belt
alignment whenever you maintain or replace belts or whenever
you remove or install sheaves.
This illustration (Fig A), shows the correct way to check
alignment between two variable speed sheaves.
Another i l lustrat ion (Fig B),shows a bel t misal igned. To
correct the alignment, move one sheave so that the straight edge
is equidistant from both sides of the narrow sheave. The belt
edges should also be equidistant from the straight edge.
Fig A: Properly Aligned Fig B: Misaligned
IDENTIFY CORRECT BELT
To select the correct belt, refer to the drive manufacturer’s
recommendations. The belt length is most critical on fxed center
drives with both pulleys variable since accurate length is required
to achieve precise drive speed variations. Belt length with one
variable and one fxed pulley is also critical as it affects the
allowable increase and decrease in center distances.
2
3
Types of Variable Speed Drives
WARNING
Disconnect power supply to the machine before removing
or installing sheaves or belts.
WARNING
Do not reinstall damaged or worn sheaves on equipment.