Original instructions GMF-E
Page 13 of 32
B0834
5.3 Pump elements
4
3
R
7
Fördervolumen
1
2
6
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
according to the adjusted volumetric displacement. The displacing piston continues
traversing and produces a vacuum in the measuring-out chamber and the lubricant is taken
in from the container 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
displacing piston to feed the lubricant to the outlet.
The pump element 8 = 0.15 cm³/stroke is marked with a red ring
‘R’.
Adjustment of the volumetric displacement:
The volumetric displacement 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 volumetric displacement at the adjusting nipple 7 with the wrench
included in the delivery.
Clockwise turn: Reducing the volumetric displacement.
Anticlockwise turn: Increasing the volumetric displacement.
The adjusting nipple features a hexagon, against which a spring-loaded piston exerts
pressure in radial direction. In this way, the volumetric displacement is prevented
from automatically changing. At the same time, this type of locking serves as a
measure for the adjustment of the volumetric displacement. Six notches correspond
to one turn of the adjusting nipple and reduction by approximately 33% of the rated
volumetric displacement. As for precise adjustment to a defined volumetric
displacement per stroke, a volumetric prove-measurement has to be taken. The
pump elements are delivered adjusted to maximum volumetric displacement.
Turn in the plug screw 7.
Volumetric displacement
