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6.3) Spring Cartridge Insertion
GNP actuators can be easily converted from Double Acting to Spring Return by changing the
spring number and configuration inside the end cap. GNP actuators can accept up to 6 springs
in the right end cap and 6 in the left end cap. We advise the insertion of at least two spring
cartridges in each end cap in order to have a uniform distribution of forces on the pistons. The
number of the springs loaded affects the torque value the actuator will be able to generate during
its working cycle.
Springs Installation Procedure:
1. Remove the four end cap screws (ref. 26) from the right and left end caps.
2. Remove the end caps (ref. 25)
3. Insert the correct number of spring cartridges into each end cap (i.e. GNP44–S4 = 4 + 4
springs). It is strongly advised to insert the plastic part of the cartridge containing the deep hole
into the appropriate end cap seat.
7. Safety Instructions
When operating any kind of element, you must follow the security instructions and it is
recommended to use personal protection gadgets:
1) Protect your eyes.
2) Wear gloves and appropriate working clothes.
3) Wear safety footwear.
4) Wear a helmet.
5) Have running water at hand.
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