- Service and maintenance - 38
Only when filling oil the hand wheel (85) has to be turned close!
To fill oil carefully open the slotted screw (57) by hand ¼ turn. The surrounding of the screw
shall be covered with a wet cloth to dind any escaping refrigerant gas. (see first photo chapter
0). If liquid refrigerant has collected in the oil chamber (e.g. because of a leaking inner shaft
seal) it may take several hours until the chamber has depressurized.
Never open the slotted screw (57) completely if there is any residual pressure re-
maining!
A lack of oil normally indicates that the inner shaft seal has started to leak and needs
to be replaced. Particularly when the oil level drops after a short period of time(less
then 14 days) the inner shaft seal must be replaced.
If the shaft seal has been replaced and you ob-serve again a lack of oil, you should
check wheth-er hand wheel (85) is/was turned open the whole time, also when work-
ing on the pump side (except when filling oil).
If the hand wheel is closed, refrigerant is trapped in the chamber around the shaft.
Evaporating reber. When the pressure difference between oil chamber and pump
suction chamber reaches an unacceptable high value, the pressure-limitation valve
(19.1) will open and release an oil/refrigerant mixture to the pump suction side. In
such an event you should replace the pressure limitation valve (19.1) and safety
pressure limitation valve (19.2) and make sure the hand wheel (85) is turned open at
all times!
The oil level shall be below the bottom thread of the oil filler plug. The maximum oil filling is
for
GP 40 pumps 1,7 ltr. (0.45 Gal) and for
GP 50 pumps 2 ltr. (0.53 Gal).
Avoid an overfilling of oil. The inlet of the pressure limitation valve (19.1) should not
be covered with oil.
When recharging oil and tightening oil filler screw (57) the hand wheel (85) must be
turned open again!
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