Grundfos LF User Manual

11
English (US)
8. Servicing the product
8.1 Maintaining the product
8.2 Lubricating the product
8.2.1 Lubricating the motor
Always follow the motor manufacturer's lubricating instructions, if
they are available, and periodically check grease fittings and
drain plugs for leaks. If the lubricating instructions are not
available, refer to the table below for recommended lubricating
intervals.
• The motor can be lubricated both when it is running or when it
is at rest.
Remove the grease drain plug, if any, and filler plug on the
grease fitting. Grease with clean lubricant until grease
appears at the drain hole or along the motor shaft.
One-half to one cubic inch (0.5
3
- 1
3
in.) of grease is sufficient for
motors of 5 hp and lower, with proportionately more grease for
bigger hp motors.
Most fractional and some integral frame motors have "sealed-for-
life" bearings, and do not require further lubrication throughout
motor life.
If lubricating instructions are not available, refer to the table
Recommended lubricating intervals on page 11 for recommended
lubrication periods.
The table Approved grease lubricants in section 8.2.2 Lubricating
the pump lists the recommended types of grease for both pump
and motor lubrication. These grease types have all been
thoroughly tested and must be used whenever possible.
8.2.2 Lubricating the pump
Grease lubrication
In the standard configuration, LF pumps on horizontal base
frames have sealed-for-life bearings. For customized pumps with
regreasable bearings, use an approved grease and proceed as
described below.
• Remove the drain plug, if any, and the filler plug. Add clean
lubricant until grease appears at the drain hole or along the
pump shaft. On pumps with drain hole, all old grease can be
purged. In such cases, the drain hole must be left unplugged
for several minutes during pump operation to allow excess
grease to be forced out.
• Lubricate the pump bearings at 1-3 month intervals,
depending on the severity of the environment. Pumps in a
clean, dry, moderate-temperature (100 °F (65 °C) maximum)
environment must be regreased at 3-month intervals.
DANGER
Moving machine parts
Death or serious personal injury.
- Before any inspection, maintenance, service or
repair of the product, make sure the motor controls
are in the "OFF" position, locked and tagged.
Recommended lubricating intervals
Motor rpm Motor hp Operating conditions
Standard Severe Extreme
1750 and
below
0.33 - 7.50 3 years 1 year 6 months
10-40 1-3 years 6 months - 1 year 3 months
50-150 1 year 6 months 3 months
200 and up 1 year 6 months 3 months
above 1750 all hp 6 months 3 months 3 months
Standard conditions:
Operating 8 hours per day, normal or light load, clean air, 100 °F
(37 °C) maximum ambient temperature.
Severe conditions:
Operating continuously 24-hours, shock loads or vibrations, poor
ventilation, 100-150 °F (37-65 °C) ambient temperature.
Extreme conditions:
Operating continuously, heavy shocks or vibrations, dirt or dust in
the air, extremely high ambient temperature.
Approved grease lubricants
Manufacturer Lubricant
Shell Dolium
®
R
Exxon Polyrex
®
Chevron
SRI Grease NLGI 2
Black Pearl - NLGI 2
Philips Polytac™
Texaco Polystar RB
Do not over-grease! Too much grease can cause
overheating and premature bearing failure.
LC_LCV_LF_LCS_1 language_US Eng.book Page 11 Thursday, August 24, 2017 4:08 PM

Grundfos LF Specifications

General

Brand	Grundfos
Model	LF
Category	Water Pump
Language	English