If a radial piston hydraulic pump fails to deliver rated fluid volume, the cause can be （）.<br>A:contaminated fluid<br>B:pitted thrust rings<br>C:worn pintle bearings<br>D:obstructed suctions passage

If a radial piston hydraulic pump fails to deliver rated fluid volume, the cause can be （）.
A:contaminated fluid
B:pitted thrust rings
C:worn pintle bearings
D:obstructed suctions passage

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