On piston shoes in radial piston pumps, motors and engines the radial load which is excerted by the pressure under the piston onto the piston shoe is to a high rate borne by hydrostatic bearings between {HEAD ~ the piston shoe} and {TAIL ~ the inner guide face} of the piston stroke actuator ring 
On piston shoes in radial piston pumps , motors and engines the radial load which is excerted by the pressure under the piston onto the piston shoe is to a high rate borne by hydrostatic bearings between { HEAD ~ the piston shoe } and { TAIL ~ the inner guide face } of the piston stroke actuator ring
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