Emergency Gearbox Operation

PRM 280, 500, 750 & 1000

Warning: first switch off the engine, select neutral on the operating lever and disconnect the operating cable to disable hydraulic operation.  

Now remove inspection plate by removing the 10 bolts.

Select the shaft which provides the appropriate rotation for forward drive.

Assuming a standard anticlockwise rotating engine,  the shaft is selected is:

Left handed propeller rotation, left-hand shaft. for right-hand propeller rotation, right-hand shaft. The opposite applies to the PRM  angle drives and coaxial drive.

500D & 750D gearbox: Turn shaft until spring clip holding the screws in position,  is accessible. Remove the spring clip and tighten the two clamping screws. This  mechanically locks the clutch pack in drive.

1000D gearbox: Locate the clutch end plate. this has three taps holes angles to facilitate access. rotate the shaft until one of the holes is uppermost and insert Allen key, found under the inspection plate, and screw the grub screw as tight as possible. rotate shaft to similarly  Tighten the other two.

Ensure that sufficient oil remains in the gearbox to avoid further damage then refit the inspection plate, tighten the bolts to the correct torque. The engine can now be run but minimise possibility of further damage being caused to the transmission by limiting engine speed to one third of full throttle.  

Warning: when emergency drive is engaged, neither astern nor neutral is available and there is no means of stopping the boat using the gearbox, you must therefore handle the boat with great care particularly to during docking.  

Whenever this operation is used, the gearbox must be fully inspected by Lancing Marine engineers before being used again.

PRM 150

Warning: first switch off the engine, select neutral on the operating lever and disconnect the operating cable to disable hydraulic operation.

Remove the bolts holding the rear manifold to the gearcase and carefully remove the manifold complete with oil pump but avoid dropping the Allen key that’s stored behind it.  

Turn the input shaft until two cap screws in the clutch gear align with the two holes in the rear of the gearcase.   Insert the Allen key through the holes in the gearcase and tighten the two screws; this locks the clutch plates together and provides drive for a right hand rotation propeller.  

Reinstall rear manifold and tighten to correct torque. Ensure that sufficient oil remains in the gearbox to avoid further damage. The engine can now be run but minimise possibility of further damage being caused to the transmission by limiting engine speed to one third of full throttle.  

Warning: when emergency drive is engaged,  neither astern nor neutral is available and there is no means of stopping the boat using the gearbox, you must therefore handle the boat with great care particularly to during docking.

Whenever this operation is used, the gearbox must be fully inspected by Lancing Marine engineers before being used again.