Lubex Automatic Grease Feeder

In many grease lubricated bearings, periodic regreasing is required. The regreasing interval and quantity are a complex function of speed, operating temperature, shaft diameter etc. Over greasing can result in overheating, causing damage to seals, also sometimes resulting in grease to liquify prematurely Under greasing is a sure recipe for equipment failure.

The simple solution is to install a LUBEX spring loaded grease feeder. This grease feeder has to be installed directly over the bearing housing in place of grease nipple. (Ref. fig.2)

The grease feeder can be installed in any position i.e. straight, 45°, 90° or upside down by using a suitable adaptor. (Ref. fig. 3.)

How does LUBEX grease feeder work?

Fill grease in the grease feeder by a grease gun through a non return valve (MW) in grease feeder. Grease pushes up the piston against a spring causing the spring to compress. A clear polycarbonate dome allows easy visibility of grease within the dome, also indicates when it is time to re-fill the grease feeder. Since there is no way your can see what is going on inside a bearing, bushing, pillow block, there is only guesswork, LUBEX dispenses right amount at right place all the time. Grease is discharged from LUBEX grease feeder base to the bearing at minimum pressure usually less then 2 psi.

The bearing's natural venturi (vacuum) causes the grease to gradually flow into the bearing. This causes the bearing to use grease only as and when required. Grease is not forced or packed into the bearing. When the bearing or equipment stops the grease flow stops.

LUBEX grease feeders have only three moving parts viz. spring, a piston (Plunger) with a precision metering rod and an '0' ring. When grease is filled in the reservoir (Dome) ) the compressed spring exerts balanced pressure on the piston connected to the metering rod. Taper in the groove of metering rod causes change in discharge orifice area proportional to the decreasing spring pressure. Thus a constant discharge pressure is maintained. (Ref. flg.4)

Three types of springs* are available to optimise discharge rate depending on viscosity of grease ( NLGI 1,2,3,4,) and also to overcome resistance to grease flow depending on distance "L" between grease feeder and bearing. (Ref. flg,5.) These grease feeders are not suitable for a distance "U' more than 250mm.

LUBEX grease feeder require a non separating grease, since it is our experience that in many conventional greases oil separates out from thickener under a constant spring pressure ER greases work satisfactorily. To fix these grease feeders it may be necessary to use adaptors as shown below. The end connection size needs to be specified. eg. 45° x 1/4, 90° x 1/8.

LUBEX Saves In Three Different Ways:

1. Fewer Bearing Failure, Lesser Downtime 2. Less Grease Used. 3. Fewer Man Hours Spent In Re-Lubrication

Model Selection Chart


DOME BASE Dimension
OD Length
Gf 30 Polycarbonate Aluminium Alloy 61 | 95 30gm Dynamic With Vibration
Gf 60 Polycarbonate Aluminium Alloy 75 | 115 60gm Dynamic With Vibration
Gf 100 Polycarbonate Aluminium Alloy 75 | 220 100gm Dynamic With Vibration
*Gf 180 Polycarbonate Aluminium Alloy 85 | 160 180gm Dynamic With Vibration

Note : We can also provide a valve to increase/decrease grease feed rate with facility of shut off. This valve has to be fixed between coupler/base.
*Under development

Application Of Grease Feeder