Pre-Installation Check
- Mod I Easy Lok: 4 1/8 inches diameter template
- Mod II Easy Lok: 6.75 inches diameter template
- Mod III Easy Lok: 11.75 inches diameter template
Create a cardboard rotor template cut in half with a centered hole for the propeller shaft. Cut a loading slot equal to the propeller shaft diameter. Use this template in the engine room to verify fit.
System Components
Shaft Lok consists of two main sections:
- Upper Housing: Contains locking mechanism with long and short pins, stainless steel spring, and spring assembly screw
- Lower Housing: Features a deep groove sealed ball bearing (maintenance-free) containing the Black Rotating Disc & Stainless Steel Hub Assembly
The propeller shaft is installed into the Hub Assembly and secured with stainless fasteners.
Locking Mechanisms
Two options for locking the system:
- Shaft Lok Marine Control Cable (S.L.M.C.C.): Fastened to the top of the housing with palm knob positioned in the cockpit
- Simple Spring Locking System (S.S.L.S.): Bolted to top of the housing with Black Palm Knob a few inches above the housing (requires engine room access)
Operation
To lock Shaft Lok when sailing:
- Press down on the Marine Control Cable or Simple Spring Locking System palm knob
- The long locking pin engages the rotating disc, preventing propeller rotation
- A spring-loaded short pin holds the long pin in locked/unlocked positions
No electrical or hydraulic power required.
Benefits
Shaft Lok provides several advantages:
- Quiet operation while sailing
- Locks propeller in most efficient position (one blade vertical)
- Optimizes boat speed
- Prevents transmission and propeller shaft bearing wear
- Automatically unlocks when engine starts and transmission engages
