SPX Cooling Technologies Marley MH 05-116E - Manual (Page 24)

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
® V-Belt
Tension Tester is an alternate method for tensioning V-belts. Check with
you local belt supplier.
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
1 ⁄
8
" of each other and level within 1 ⁄
2
° ( 1 ⁄
8
" in 12) in order to 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.
Figure 3
SHEAVE
FAN SHAFT
SHEAVE
STRAIGHT EDGE