Sheave Alignment - SPX Cooling Technologies MARLEY MH MHF702 User Manual

Figure 3
24
Maintenance
sion is the lowest tension at which the belt will not slip under peak load
conditions. Check tension frequently during the first 24-48 hours of run-in
operation. Overtensioning shortens belt and bearing life. Keep belts free
from foreign material which may cause slipping. Never apply belt dress-
ing as this will damage the belt and cause early failure. A Dodge
Tension Tester is an alternate method for tensioning V-belts. Check with
you local belt supplier.
SHEAVE

Sheave alignment

• The motor sheave is to be positioned as close as possible to the motor
in order to minimize stress on the motor bushings.
• The motor and fan sheaves may have grooves that are not used. The
bottom surface of the motor and fan sheaves must be aligned within
3mm of each other and level within
not adversely affect belt and sheave life.
• Alignment can be achieved by placing a straight edge across the
sheaves making sure that it is level and measuring down to the bot-
tom surface of both sheaves at four points.
• The belt is to be located in the grooves closest to the motor center-
line.
FAN SHAFT
STRAIGHT EDGE
⁄ ° (3mm in 305mm) in order to
1
2
® V-Belt
SHEAVE