Operating manual PMF/GMF Page 17 of 37 B0343
4.4 Pump elements
The displacing piston 1 and control piston 2 generate the suction stroke. For that purpose,
the eccentric shaft moves the displacing piston 1, whilst a spring actuates the control piston
2. The control piston closes the pressure borehole 3 and stops at a defined position accord-
ing to the adjusted delivery volume. The displacing piston continues traversing and produces
a vacuum in the measuring-out chamber and the lubricant is taken in from the reservoir by
the displacing piston after opening the suction borehole 4.
For the pressure stroke, the displacing piston 1 travels to the left to shut the suction borehole
4 and the control piston 2 is displaced by the lubricant enclosed between displacing piston
and control one until the control piston opens the pressure borehole 3 to enable the displac-
ing piston to feed the lubricant to the outlet.
The pump element having a piston diameter of 8 mm = 0,15 cm³/stroke is marked with a red
ring R.
Adjustment of the delivery volume:
The delivery volume can be reduced to a minimum of about 25% of the rated one. For that
purpose, take the following actions:
Turn out the plug screw 7.
Set the required delivery volume at the adjusting nipple 7 with the wrench included in
the delivery.
Clockwise turn: Reducing the delivery volume.
Anticlockwise turn: Increasing the delivery volume.
The adjusting nipple features a hexagon, against which a spring-loaded piston exerts
pressure in radial direction. In this way, the delivery volume is prevented from auto-
matically changing. At the same time, this type of locking serves as a measure for the
adjustment of the delivery volume. Six notches correspond to one turn of the adjust-
ing nipple and reduction by approximately 33% of the rated volumetric displacement.
As for precise adjustment to a defined delivery volume per stroke, a volumetric prove-
measurement has to be taken. The pump elements are delivered adjusted to maxi-
mum volumetric displacement.
Turn in the plug screw 7.
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