Mechanical_ Basic Hydraulic Course Part 2F

Gear Pump Displacement Increases with increased input rpm?

• True

• False

Gear Pumps

• Trap fluid between the teeth and the housing

• have many moving part parts

• are used to control pressure control valves

Increasing the angle of the swashplate in a piston pump:

• increases the pistons displacements

• allows the pump to rotate faster

• increases the pump outlet pressure

axial piston pumps utilize a rotating swashplate

• True

• False

Gear Pumps

• may be variable

• are usually not used in hydraulics

• change dispalcement with changes in rpm

• give constant output with constant rpm

Variable displacement pumps change the output flow by

• changing either the pumps rpm or swashplate angle

• only changing the swashplate angle

• only changing the pumps rpm

Variable volume pumps may also be pressure compensated

• True

• False

Piston Pumps

• increases flow by increasing the angle of the swashplate

• decrease flow with increase in swashplate angle

• are at full displacement when the rotating group in turning

When an axial piston pumps is de-stroked, or fully compensating:

• the swashplate is at a 19^o angle

• the swashplate is at a 0^o angle

• there is no pressure

• there is maksimum flow

Vane Pumps

• are not positive displacement

• May be balanced or unbalanced

• use a rotor for pumping