A closed center type of system will most likely feature this: ...

[renzo156]

A closed center type of system will most likely feature this:
 
  a. A gear pump
  b. A variable displacement pump
 c. An accumulator d. No relief valve

Question 2

Before performing service or repairs to a hydraulic system you MUST:
 
  a. Let the oil cool down
 b. Remove the pump outlet hose
 c. Release all trapped system pressure
 d. Warm the oil up to operating temperature

[whitcassie]

Answer to Question 1

B

Answer to Question 2

D