Loher Str. 4
58332 Schwelm
Germany
fon: +49 2336 92 98-0
fax: +49 2336 92 98-100
info@henning-gmbh.de
www.henning-gmbh.de
www.henning-cnc.de
Operating Instructions Elevator Buffers LP Page 7 Edition 3.3.1 EN of 03.04.2017
8. 3 Correction of the oil level
• Remove the oil filling screw 14 after hav-
ing relieved the gas pressure.
• For refilling use the following oil types
only:
a) buffer standard model (-10 °C up to
+50 °C):
Hydraulic oil DIN 51524-2 HLP re-
spectively ISO 6743/4 HM viscosity ISO
VG 46
b) buffer with low temperature design
(-20 °C up to +40 °C, see label):
Hydraulic oil DIN 51524-3 HVLP respec-
tively ISO 6743/4 HV viscosity ISO VG
22
• Refill the hydraulic oil:
- buffers with one sight glass: until the
oil level is in the centre of the sight
glass
- buffers with two sight glasses: until the
oil level is below the top edge of the
upper sight glass
• If the oil level is too high (see 7.2), oil
must be removed.
• The limit values of the oil levels (see Fig.
2a/2b) should absolutely be observed.
The correct oil level is only indicated if
the piston rod is fully extended. In the
case of too high an oil level there is a
danger that the buffer becomes over-
loaded during buffer stroke. If the oil
level is too low, the damping effect of
the buffer may be reduced.
• Then replace the oil filling screw 14.
Make sure a new copper sealing ring A
14x18 DIN 7603 is used.
• Subsequently refill gas.
If an inspection book is kept for the elevator
buffer, the oil level corrections should be record-
ed here.
8.4 Gas refilling
• Remove the cap from the gas filling
valve 15.
• Place a tire filling device on the filling
valve. All commercially available filling
systems can be used for car tire valves
VG8.
• Fill the buffer with nitrogen gas, filling
pressure 5 bar. The filling pressure must
not be exceeded.
• The piston rod should now be fully ex-
tended.
• The use of pressurized air instead of ni-
trogen is allowed. Never fill with oxygen
or other inflammable gases such as
propane and acetylene!
• Finally check the gas filling valve 15 and
the oil filling screw 14 with a leak-
detecting spray or soap water for gas
tightness.
• Replace the valve cap.
To Next Page
Loading...