KM 251 en
42 15.720148-V1.0
9.6 Changing the diaphragm and gear oil for dosing head with single
diaphragm (no MBS)
!
Warning
When working on the dosing head, connections or lines:
Wear the necessary protective clothing (goggles, gloves)!
The dosing diaphragm should be replaced with each gear oil change.
Before removing the dosing head, valves and media lines, empty any remaining
medium in the dosing head into a driptray by carefully unscrewing the suction
valve.
Caution
Only use original ALLDOS gear oil!
ALLDOS gear oil
Note
Collect gear oil in a container and dispose of correctly.
9.6.1 Drain gear oil
1. Unscrew the stroke adjustment screw (B) and collect gear oil in a container.
2. Screw the lock screw (B) and the new gasket (1b) back in and tighten well.
Caution
Risk of leaking and damage caused by oil loss! For each oil change, a new flat gas-
ket (1b) must be used!
9.6.2 Removing the dosing head
1. Close dosing lines on suction and pressure side and loosen suction and pressure
valve connections.
2. Loosen the 6 dosing head screws (1q with 2q) and remove the dosing head (2).
9.6.3 Replacing a single diaphragm (no MBS)
• Remove the diaphragm, fit new diaphragm (Q) on suction side (see diagram below).
Pump Type Order No. Description
KM 251 single / double 555-300 1,3 l white oil (paraffin 55 DAB7)
B Lock screw
1b Gasket
F Oil filling screw
L Stroke adjustment button
1b
L
F
B
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