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The casing is stationary, which means that the cylinder block and piston assembly rotates. Between the end positions of a stroke, the piston tilts 2ß due to the changed direction of the tangential force and clearance. Figure 1. The Hägglunds radial piston hydraulic motor. Piston movement during the stroke in driving mode.

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Andrew Parr MSc, CEng, MIEE, MInstMC, in Hydraulics and Pneumatics (Third Edition), Piston pumps. A piston pump is superficially similar to a motor car engine, and a simple single cylinder arrangement was shown earlier in Figure a simple pump, however, delivering a single pulse of fluid per revolution, generates unacceptably large pressure pulses into the .