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Hydraulic machinery failures are commonly caused by contamination of the hydraulic fluid and _____.

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hydraulic fluid contamination  excessive fluid friction  turbulent fluid flow  fluid pressure surges  
a low load on the unit  a clogged pump suction strainer  a blockage in the line between the pump and hydraulic motor  the hydraulic motor turning too fast  
permanent loss of pump suction  worn shaft seals  high level in the oil sump  low motor RPM  
transmitter  tele-motor  hydraulic ram  hydraulic cylinder  
Motors  Check valves  Safety valves  Reducing valve  
the temperature of the hydraulic fluid  the flow rate of the hydraulic fluid  the temperature of the cooling water  all of the above  
Hydraulic pumps  Valves  Hydraulic cylinders  Hydraulic motors  
warm-up allows the hydraulic system to become charged with oil  warm-up allows the relief valves to be properly tested  hydraulic strainers operate only during the warm-up period  hydraulic fluid must be at the proper viscosity  
Hydraulic pumps  Valve  Hydraulic cylinders  Hydraulic motors  
dirt  fuel oil  governor cooling water  fuel oil tars  
flattening test;hydrauliC test  hydrauliC test;flattening test  flattening test;hardness test  hardness test;hydrauliC test  
a differential gear  return springs  a hydraulic accumulator  relief valves  
transmit the rudder angle to the bridge indicator  prevent the control linkage from striking the stops when hard over  automatically purge all entrained air from the system  send hydraulic signals to the receiving unit  
regulate the fluid flow in either direction  restrict movement of hydraulic fluid in one direction, but allow free movement inthe other direction  allow free movement of hydraulic fluid in both directions  allow a restricted fluid flow in one direction only  
steam plants, electric motors and compressed air  diesel engine, hydraulic machinery and compressed air  steam plants, electric motors and hydraulic machinery  diesel engines, steam plants and hydraulic machinery  
The hydraulic pumps  Valves  Hydraulic cylinders  Hydraulic motors  
excessive internal leakage in the pump  low discharge pressure and fluid flow  excessive fluid level in the hydraulic reservoir  operation of the pump at 100% efficiency  
flattening test;hydraulic test  hydraulic test;flattening test  flattening test;hardness test  hardness test;hydraulic test  
Hydraulic oil  Animal oil  Light oil  Fuel oil  
hydraulic pumps  valves  hydraulic cylinders  hydraulic motors  

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