Jesco MEMDOS E, Operation Manual

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11. Maintenance
These dosing pumps are produced to the highest quality standards, and have a long service life. Neverthe-
less, some of their parts are subject to wear due to operation (e.g. diaphragms, valve seats, valve balls).
Regular visual inspections are therefore necessary in order to ensure a long operating life. Periodic
maintenance will protect the dosing pump from operation interruptions. The manufacturer recommends
maintenance once per year, provided the local regulations do not specify more frequent maintenance.
11.1 Lubrication
The MEMDOS E/DX diaphragm dosing pump requires little maintenance. The dosing pump gear is lubricated
with gear oil of viscosity class ISO-VG460 according to DIN 51519 (corresponds to SAE 140 according
to DIN 51512). The first filling, which is supplied with the product, is to be replaced after 5,000 operating
hours or 1 year, whichever comes first. Further oil changes should be conducted after 10,000 operating
hours or 2 years, whichever comes first. The filling capacity is about 0.25 l for gears of sizes up to MEMDOS
E/DX 156 and about 0.7 l for gears of sizes up to MEMDOS E/DX 380. The actual quantity of gear oil
required can be determined by checking the min./max. marks on the oil dipstick.
ATTENTION!
MEMDOS DX: To avoid damage to the approximation initiator, the dosing pump must be switched off before
taking out the oil dipstick.
11.2 Maintenance of the bearings
The upper bearing of the pinion shaft is a sealed and permanently lubricated ball bearing. In the Size I
MEMDOS E/DX (up to E/DX 150), this function is also performed by the drive side motor bearing. The other
roller bearings in the gearing, and the plain bearings of the diaphragm rod, are lubricated by the gear oil.
The oil also performs a heat dissipation function.
All bearings must be examined for wear after 10000 hours of operation. The service life of the roller bear-
ings depends on the applied loads.
11.3 Maintenance of the ATE servomotor (optional)
The ATE servomotor is given permanent lubrication at the factory. Nevertheless, regular inspections are rec-
ommended if the drive is operated in tough operating conditions, for example in high ambient temperatures
or continuous operation.
11.4 Diaphragm replacement
CAUTION!
Chemical may spray out. This may lead to chemical or other burns. The dosing pump must always be
depressurised and rinsed with water or a suitable medium before starting any work on the dosing pump.
a
Dosing head with discharge and suction valve
b
Diaphragm
c
Support plate (only E/DX 50,75,76)
d
Diaphragm rod
e
Diaphragm flange
f
Gear housing a
d
e
f
b
c
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