If it were possible to simultaneously...

Question 1 / 205eccef9cbacbc34ba4d45a59

Question 1 of 205eccef9cbacbc34ba4d45a59

If it were possible to simultaneously operate both main pumps shown in the steering gear illustration, which of the following statements would be true if the starboard power unit were to be brought on line with the port unit already in operation? See illustration GS-0123.

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🔍 Key Concepts

• Hydraulic power unit redundancy in steering gear systems (one unit driving, the other on standby or recirculating) • The function of the distributor valve A and how it routes or blocks flow when a unit is brought on line • The difference between main pump flow, servo control oil, and replenishing oil from the small auxiliary pumps (G and I)

💭 Think About

• When the port unit is already running the rudder, what must happen hydraulically to prevent the starboard unit from fighting it? Trace the flow paths from the starboard main pump through distributor valve A and valve block C. • Look closely at labels G and I: which one appears tied into a small control circuit to the stroking mechanism, and which one ties into a low-pressure make‑up/replenishing line to the reservoir and return? • If both main pumps could theoretically run together, which component in the starboard system would most likely shift or open to keep its main pump from sending high‑pressure flow to the ram circuits already pressurized by the port unit?

✅ Before You Answer

• Identify on the illustration which lines are high‑pressure to the rams and which are low‑pressure return or make‑up before deciding. • Confirm which pump (G or I) connects into the servo/stroke control circuit for the variable‑displacement main pump, and which connects into the tank/replenishing circuit. • Check how the valve spool at C and distributor valve A are drawn in the port vs. starboard units; note which one is shown in a recirculation or neutral position when that side is not the active power unit.

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Question 1 of 20

The indicated valve spool in "C" would shift to the left

Pump "I" would supply replenishing oil to the system

The starboard distributor valve "A" would allow recirculation of the starboard main pump

Pump "G" would supply servo control oil flow to control the main pump stroke control mechanism

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Question 1 / 205eccef9cbacbc34ba4d45a59

Question 1 of 205eccef9cbacbc34ba4d45a59

Back

Question 1 of 20

5eccef9cbacbc34ba4d45a59

No comments yet

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If the question has a related picture, it will appear here.

🔍 Key Concepts

💭 Think About

✅ Before You Answer

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