To convert a vane type hydraulic pump to a...

🔍 Key Concepts

• How a vane-type hydraulic pump actually moves fluid (role of the vanes and rotor) • What extra feature a hydraulic motor needs so the vanes stay in contact when driven by fluid instead of pushing fluid • The mechanical purpose of springs or other loading devices behind vanes in many motor designs

💭 Think About

• Think about what changes when the unit is used as a motor: now the pressure oil is turning the rotor, instead of the rotor pushing oil. What must keep the vanes properly seated? • Which option actually affects vane contact and sealing against the cam ring/control ring, rather than just strength or size of components? • If the rotor slows or starts from rest, what design feature helps the vanes move outward to maintain contact with the ring before centrifugal force is available?

✅ Before You Answer

• Identify which choice directly improves vane outward pressure/contact with the cam ring/control ring. • Eliminate any option that only changes thickness, size, or number of vanes without addressing how the vanes stay sealed against the ring at low speed. • Ask: which modification do you commonly see in vane-type hydraulic motors but not necessarily in simple vane pumps?

To convert a vane type hydraulic pump to a hydraulic motor, which of the following would have to be done?

Double the casing thickness.

Provide small springs between the vanes and the base of the vane slots.

Install an enlarged control ring around the rotor.

Provide one additional slot and vane.

🔍 Key Concepts

💭 Think About

✅ Before You Answer