SPX Cooling Technologies Fluid Cooler Marley MC - Manual (Page 21)

21
Maintenance
Belt Tensioning
The belts are adjusted by means of a hinged base with tensioning bolts
accessible through the access panel/fan guards. Check tension frequently
during the first 24-48 hours of run-in operation. To properly adjust the
belt tension, position the fan motor so that moderate pressure on the belt
midway between the sheaves will produce a
1 ⁄
2
" deflection. Overtensioning
shortens belt and bearing life. Keep belts free from foreign material which
may cause slipping. Never apply belt dressing 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 torque 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 top
of the sheaves making sure that it is level and measuring down to the
bottom surface of both sheaves at four points.
• The belt is located in the inboard set of grooves closest to the bearing.
Fluid Cooler Maintenance
Some maintenance procedures may require maintenance personnel to
enter the fluid cooler.
The purchaser or owner is responsible for providing a safe method
for entering or exiting the access door.
Warning
Bushing Fastener Torque ft·lb
ƒ
SD 1 ⁄
4
- 20 6
SK 5 ⁄
16
- 18 13
SF 3 ⁄
8
- 16 22
E 1 ⁄
2
- 13 35
Bushing Fastener
Torque Values
➠