Nexen MBU-875 930200 - Manual (Page 9)

9 FORM NO. L-20134-J-1211
NOTE
Nexen pneumatically actuated devices require clean, pressure regulated air for maximum performance and
life. All seals in Nexen Pneumatically operated devices are lubricated for life and do not require additional
lubrication.
However, some customers prefer to use an air line lubricator, which injects oil into the pressurized air,
forcing an oil mist into the air chamber. This is acceptable, but care must be taken to ensure once an air mist
lubrication system is used, it is continually used over the life of the product as the oil mist may wash free the
factory installed lubrication.
Locate the lubricator above and within ten feet of the product, and use low viscosity oil such as SAE-10.
Synthetic lubricants are not recommended.
Nexen product's bearings are shielded and pre-lubricated, and require no further lubrication.
LUBRICATOR DRIP RATE SETTINGS
1. Close and disconnect the air line from the unit.
2. Turn the Lubricator Adjustment Knob counterclockwise three
complete turns.
3. Open the air line.
4. Close the air line to the unit when a drop of oil forms in the
Lubricator Sight Gage.
5. Connect the air line to the unit.
6. Turn the Lubricator Adjustment Knob clockwise until closed.
7. Turn the Lubricator Adjustment Knob counterclockwise one-
third turn.
8. Open the air line to the unit.
AIR CONNECTIONS
NOTE
For quick response, Nexen recommends a quick exhaust
valve and short air lines between the Control Valves and
the Modular Units. Align the air inlet ports to a down
position to allow condensation to drain out of the air
chambers of the Modular Units.
Adjust the air pressure to approximately 50 psi [3.45 bar]
when the Modular Unit is installed between a motor and
gear reducer.
When the Modular Unit is mounted using sheaves or
sprockets, the air pressure may be regulated between 10
psi [0.7 bar] to 80 psi [5.5 bar] to ensure air pressure is
adequate for torque requirements.
LUBRICATION
CAUTION
These settings are for Nexen supplied
lubricators. If you are not using a Nexen
lubricator, calibration must follow the
manufacturer's suggested procedure.
CAUTION
Low air pressure will cause slippage and
overheating. Excessive air pressure will
cause abrupt starts and stops, reducing
Modular Unit life.
All Nexen pneumatically actuated devices require clean
and dry air, which meet or exceeds ISO 8573.1:2001
Class 4.4.3 quality.