Service Manual
18/20
1.5 Issue
Ref. NR-00008-ENG
http://www.gamapur.com
Pneumatic cylinder
WARNING:
Before performing maintenance work on the gun, make sure that the unit is
at a complete standstill, that all of the buttons and the main switch are turned off and that
the unit is disconnected from the main power supply. The gun is a component that works
under pressure; no connection must be opened or maintenance work done on
components subject to pressure until the pressure has been completely eliminated.
Unscrew the air cap. Remove the side blocks from the gun block. Clean the contact surfaces
using a cloth dampened with gun cleaning solvent.
Remove the gun block from the gun by sliding it over the chamber. To eliminate the remains of
product, clean the gun block unit using a cloth dampened with gun cleaning solvent. Remove
the o-ring.
Use a spanner to lock the end of the pneumatic cylinder shaft and unthread the mixing
chamber. Clean the mixing chamber and, if you consider it necessary, use a brush to go over
the passage holes.
Remove the cylinder clamp.
Using the snap ring pliers, remove the retaining ring holding the end cap.
Pull hard on the blocking device to remove the whole unit from the cylinder bore. Also remove
the spring and the piston assembly from inside the cylinder.
Using the snap ring pliers, remove the snap ring from the piston shaft and separate it from the
piston.
Check the state of the o-rings of the shaft and piston. Replace them if they are damaged. Apply
a little grease to facilitate the fitting.
Fit the piston by sliding it onto the shaft taking special care not to damage the o-rings. Fit the
retention ring.
Fit the piston assembly into the cylinder bore.
Insert safety stop assembly into the cylinder bore until it passes the insertion groove of the
retention ring.
Fit the retention ring using the snap ring pliers.
