Specifications

Series CU
Actuator Precautions 2
Be sure to read before handling.
1. Use clean air.
Do not use compressed air containing chemicals, synthetic oils
containing organic solvents, salt, or corrosive gases, as this can
cause damage or malfunctions.
Air Supply
1. Preparation before piping
Before piping is connected, it should be thoroughly flushed out
with air or water to remove chips, cutting oil, and other debris.
2. Wrapping of sealant tape
When screwing together pipes and fittings, be certain that chips
from the pipe threads and sealing material do not get inside the
piping.
Also, when sealant tape is used, leave 1.5 to 2 thread ridges
exposed at the end of the threads.
1. Install air filters.
Install air filters at the inlet side of valves. The filtration degree
should be 5µm or finer.
2. Install an after-cooler, air dryer, or water
separator (Drain Catch).
Air that includes excessive drainage or condensate may cause
malfunction of valves and other pneumatic equipment. To
prevent this, install an after-cooler, air dryer, or water separator
(Drain Catch).
3. Use the product within the specified range of
fluid and ambient temperature.
Take measures to prevent freezing when below 5°C, since
moisture in circuits can freeze and cause damage to seals and
lead to malfunctions.
Refer to SMC’s “Air Preparation System” catalog for further details
on compressed air quality.
Piping
1. Lubrication of non-lube type cylinder
The cylinder is lubricated for life at the factory and can be used
without any further lubrication.
However, in the event that the cylinder is lubricated additionally,
be sure to use class 1 turbine oil (with no additives) ISO VG32.
Stopping lubrication later may lead to malfunctions because the
new lubricant will cancel out the original lubricant. Therefore,
lubrication must be continued once it has been started.
Lubrication
Caution
Caution
Warning
Caution
1. Readjust using the cushion needle.
Cushion needles are fully closed at the time of shipment. When
the cylinder is put into service, the cushion needles should be
readjusted based on factors such as the size of the load and
the operating speed. When the cushion needles are turned
clockwise, restriction of the air flow becomes greater and thus
the cushion effect also increases.
2. Do not operate with the cushion needles fully
closed.
3. Adjust the cushion needles by gradually
opening from the closed condition to a de-
sired cushion speed.
Cushion
Caution
Caution
1. Be certain to align the rod center of the piston
axis with the load and direction of movement
when connecting.
When a cylinder is not properly aligned, the rod and tube may
be twisted. This can cause wear on areas such as the inner
tube surface, bushings, rod surface, seals, and cause damage
to these areas.
2. When an external guide is used, connect the
piston rod end and the load in such a way
that there is no interference at any point
within the stroke.
3. Do not scratch or gouge the cylinder tube or
the sliding parts of the piston rod by striking
or grasping them with other objects.
Cylinder bores are manufactured to precise tolerances, so that
even a slight deformation may cause faulty operation.
Also, scratches or gouges in the piston rod may lead to
damaged seals and cause air leakage.
4. Prevent the sticking (through friction) of
rotating parts.
Prevent the sticking of rotating parts (pins etc.) by applying
grease.
5. Do not use until you can verify that equipment
can operate properly.
Following mounting, repairs, or conversions, verify correct
mounting by conducting suitable function and leakage tests
after piping and power connections have been made.
6. Instruction manual
The product should be mounted and operated after thoroughly
reading the manual and understanding its contents.
Keep the instruction manual where it can be readily referred to
as needed.
Mounting
Wrapping direction
Sealant tape
Expose approx. 2 threads
14