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Parker Hannifin
Pump and Motor Division
Trollhättan, Sweden
Service Manual
Series F11
Bulletin HY30-5503-M1/UK
Design
Series F11 pumps/motors consist of a rotating group contained in a split housing. Spherical
pistons (1) with laminated piston rings (2) operate at a 40° angle relative to the shaft (3). As
the shaft turns, the pistons are driven in a reciprocating movement in the cylinder barrel (4).
When the unit is used as a pump, the oil passes from the inlet port to the cylinder barrel and is
then forced to the outlet port through the pumping action of the pistons.
A barrel retaining ring maintains the barrel against the valve plate (5). A ring gear (6) on the
shaft meshes with the corresponding teeth of the cylinder barrel (4) so that the cylinder barrel
always rotates at the same speed as the shaft (3). The shaft is supported by two heavy duty
tapered roller bearings (7).
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