Greenheck DG / DGX with Pilot Ignition (463555 IOM) (Pre-2008) - Manual (Page 41)

41
Maintenance
Maintenance - Routine
CAUTION!
Lock-out the gas and the electrical power to the unit before performing any maintenance or service
operations to this unit.
IMPORTANT!
Do not install new belts on worn
sheaves. If the sheaves have
grooves worn in them, they must
be replaced before new belts are
installed.
IMPORTANT!
Premature or frequent belt failures can be caused by
improper belt tension, or misaligned sheaves.
Abnormally low belt tension
will cause squealing on start-
up, excessive belt flutter,
slippage and overheated
sheaves
Abnormally high belt tension
or drive misalignment will
cause excessive bearing
loads and may result in
failure of the fan and/or
motor bearings.
IMPORTANT!
When replacing V-belts on
multiple groove drives all belts
should be changed to provide
uniform drive loading.
Belt Span
Deflection =
Belt Span
64
IMPORTANT!
Do not pry belts on or off the
sheave. Loosen belt tension until
belts can be removed by simply
lifting the belts off the sheaves.
V-Belt Drives
V-belt drives must be checked on a regular basis for
wear, tension, alignment and dirt accumulation.
Check the alignment by using a straight edge across
both sheaves as shown below.
Check the tension by measuring the deflection in the
belt as shown below.
Belt Tension Drive Alignment