Fluke RUSKA 2470 - Manual (Page 41)

Operation
High Range Piston Assembly
5
5-11
When working at high pressures (over 100 psi), or after reducing a high pressure to a
lower pressure, the high range piston can sometimes seem sticky even if it is clean.
Rotating the masses while gently bouncing the weights up and down usually frees the
piston in a minute or so. However, if the piston is actually dirty, no amount of rotating or
bouncing will make it perform properly. In that case the piston and cylinder must be
cleaned.
gmq20.bmp
Figure 5-12. Section View, High Range Piston/Cylinder