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Class 2 (2nd Engineer) MEKG 📅 Jan 2025

Exam Question

Sketch a transmission shaft coupling which enables the propeller shaft to be withdrawn outward.

(a) Describe a coupling and the method of fitting and withdrawing. (8)

(b) State the safety precautions that should be taken when fitting. (4)

(c) State what safety precaution should be taken when dismantling the coupling. (4)

Exam question diagram

Reference Answer

### (a) Description of Coupling, Fitting, and Withdrawing
A transmission shaft coupling that enables the propeller shaft to be withdrawn outboard (aftwards) is the hydraulic muff or sleeve coupling, such as the SKF type. This design provides a powerful friction grip without the need for keys or flanges, simplifying the shaft line and facilitating easier maintenance.
#### Description of the SKF Hydraulic Muff Coupling
This coupling is a keyless design that relies on the principle of oil-injection mounting. It is comprised of three primary components:

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