Hofmann ATC 900 - 7.3 Opening arm cylinder # EAA0350 G44 A: check and replacement

CTC-CEN Service Manual 07-13 Rev.E
43
7.3 OPENING ARM CYLINDER # EAA0350G44A: CHECK AND REPLACEMENT
 : 30’
 : Allen key 6mm, 17 and 24mm end keys
 : Defective opening arm cylinder may cause the following malfunction:
1. External air leaking from the flange or from the piston rod
2. Air leaking from fittings.
3. The operating arm will not open or close and air leaking is reported from the valve
TO CHECK THE EXTERNAL AIR LEAKING
 Position the cylinder where it leaks air.
 Check if the leaking is in between cylinder flange-cylinder liner or if it is coming from the piston rod.
 In case of need, place some soap with water on the interested part to better see where the leaking is coming
from.
TO CHECK THE FITTING AIR LEAKING
 Position the cylinder where it leaks air.
 Check if the leaking is in between the fitting and the cylinder flange.
 In case of need, place some soap with water on the interested part to better see where the leaking is coming
from.
TO CHECK THE CYLINDER WHEN OPERATING ARM WILL NOT OPEN OR CLOSE
 Position the cylinder where it leaks air.
 Disconnect the air pipe where there is not any air pressure.
 If the air is getting out from the fitting, the swing cylinder is leaking air.
 If the air is getting out from the fitting, the control valve is leaking air.
TO REPLACE THE CYLINDER
 Unplug the machine from the air pressure.
 Disconnect the air pipes from the cylinder.
 Unlock the nut with 24mm end key and disconnect the cylinder
rod from the operating arm bushing.