Greenheck DG / DGX Industrial Space Heating (464044 IOM) (Pre-2009) - Manual (Page 24)

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 tension by measuring the deflection in the
belt. See figure #27.
Check the alignment by using a straight edge across
both sheaves. See figure #28.
M - 1
Motors
Motor maintenance is generally limited to cleaning
and lubrication (where applicable).
Cleaning should be limited to exterior surfaces only.
Removing dust and grease build-up on the motor
assures proper motor cooling.
Motors supplied with grease fittings should be
greased in accordance with the manufacturer’s
recommendations.
IMPORTANT!
Do not allow water or solvents to enter the motor
or bearings. Motors and bearings should never
be sprayed with steam, water or solvents.
IMPORTANT!
Greasing motors is only intended when fittings
are provided. Many motors are permanently
lubricated, requiring no additional lubrication.
Wheels
Wheels require little attention when moving clean air. Occasionally oil and dust may accumulate on the wheel
causing imbalance. When this occurs the wheel and housing should be cleaned to assure proper operation.
Figure 27.
Belt Tension
Figure 28.
Drive Alignment