Watson-Marlow 621CC - Manual (Page 16)

14 Air motors
Installation
A muffler is supplied with the air motor, but not installed. Install a moisture trap and filter
in the air line ahead of the motor. If condensates need to be flushed out of the motor, use
clean, dry air at low pressure. For efficiency of output and speed control, use air lines of the
same size or next pipe size larger than the intake port of the motor. A four-way valve which
can be connected by piping to both air ports of the motor will make reversing possible. Use
a pressure regulator or a simple shut-off valve to obtain desired power and conserve air to
regulate speed and torque.
Lubrication
Use a detergent SAE #10 automotive engine oil. Lubrication is necessary for all moving
parts and rust prevention. We recommend that an automatic air lubricator be installed in
the air line just ahead of the motor. The lubricator should be adjusted to feed one drop of
oil for every 50-75 CFM of air going through the motor.

Manual lubrication Add 10-20 drops of oil every eight hours of operation through
the inlet port while the pump is shut down.

Automatic lubrication An In-line oiler should be adjusted to feed one drop per
minute for high speed or continuous duty use. Do not overfeed oil as contamination
of the exhaust air may occur.
Troubleshooting
The air motor is designed for air only. Do not allow corrosive,
flammable or explosive gases or particulate material to enter the
motor. Water vapour, oil-based contaminants, or other liquids must
be filtered out. The recommended air pressure should not exceed
100 PSIG maximum.
Always disconnect the air supply before servicing.
Reason
Low
torque
Low
speed
Won't
run
Runs
hot
Runs well
then
slows
Dirt, foreign material
Internal rust
Misalignment
Insufficient air pressure
Air line too small
Restricted exhaust
Poor lubrication
Jammed machine
Compressor too small
Compressor too far from
unit
Page 16 of 46 Watson-Marlow Bredel E-Manuals
21/12/2011 file://R:\staging\pdfs-global\m-621cc-gb-04.html