Class 4 (4th Engineer) MEKG 📅 Mar 2025

Exam Question

(a) Sketch a two-ram type hydraulic steering gear with a single Electro-hydraulic pumping unit. Show the hunting gear arrangement and indicate valve positions. (8)

(b) State the purpose of, and describe the operation of:

(i) Hydraulic shock/buffer valves. (3)

(ii) The replenishing tank. (2)

(iii) Hunting gear. (3)

Reference Answer

### (a) Two-Ram Hydraulic Steering Gear with Hunting Gear
**System Description:**
A two-ram electro-hydraulic steering gear consists of a tiller arm keyed to the rudder stock. The tiller is moved by two opposing hydraulic rams, each housed in a cylinder. These cylinders are connected by hydraulic piping to a variable delivery pump, typically a Hele-Shaw (radial piston) or swash plate (axial piston) type, driven by a constant speed electric motor. A telemotor receiver (or electronic control unit) receives the command signal from the bridge and initiates the steering action.
**Sketch Description:**

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