Diesel Marine Propulsion Engines & Generating Sets
+44 (0)1452 723 492 | sales@betamarine.co.uk

Gearbox Options

Beta Marine offer the following standard gearbox options and reduction ratios. Gearboxes have been selected to match the torque loading of each engine and will be correct for the majority of Narrowboats, Wide Beams or Dutch Barges.

In heavier duty applications such as commercial boat hire it may preferred to specify a heavier duty gearbox and / or different reduction ratios that are tailored to suit their use and environment. Please contact the Beta Marine Help Desk team who would be pleased to listen to your bespoke needs and offer the best solution. Additionally if more appropriate, we offer a service to mount your existing gearbox on to a new Beta Marine engine.

Technodrive (Mechanical Gearbox)RatioBeta 14Beta 16Beta 20Beta 25Beta 30Beta 38
TMC 602.00:1
2.45:1
2.83:1
ExtraExtraExtraExtraStandardStandard
Oil Cooler for LH in aheadExtraExtraExtraExtraExtraExtra
Technodrive (Hydraulic Gearbox)RatioBeta 14Beta 16Beta 20Beta 25Beta 30Beta 38
TM 3452.00:1
2.47:1
-----Standard
PRM Marine (Mechanical Gearbox)RatioBeta 14Beta 16Beta 20Beta 25Beta 30Beta 38
PRM 902.04:1
2.50:1
StandardStandardStandardStandardStandard-
PRM 1252.04:1
2.50:1
2.94:1
ExtraExtraExtraExtraStandardStandard
PRM Marine (Hydraulic Gearbox)RatioBeta 14Beta 16Beta 20Beta 25Beta 30Beta 38
PRM 1502.09:1
2.82:1
StandardStandardStandardStandardStandardStandard
PRM 2801.96:1
2.94:1
-----Extra
Technodrive (Hydraulic Gearbox)RatioBeta 43Beta 50Beta 60Beta 75Beta 90TBeta 105TBeta 115T
TM 3452.00:1
2.47:1
ExtraExtraExtraStandard---
PRM Marine (Hydraulic Gearbox)RatioBeta 43Beta 50Beta 60Beta 75Beta 90TBeta 105TBeta 115T
PRM 1502.09:1
2.83:1
StandardStandardStandard----
PRM 2801.96:1
2.94:1
ExtraExtraExtraStandardStandardStandardStandard
PRM 5001.94:1
2.57:1
2.90:1
---ExtraExtraExtraExtra
Hydraulic 'Soft Shift'ExtraExtraExtraExtraExtraExtraExtra

Optional ‘Soft Shift’ for PRM Gearboxes

Suitable for PRM 280 & 500 Models

PRM gearboxes are renouned for their quality and reliability, however in some applications and / or circumstances they can be slighlty abrupt and noisey when gear changes are made and a transmission ‘jolt’ maybe experienced. The Beta Marine ‘Soft Shift’ option slows down the gear engagement time which provides a smooth and silent transition between forward, neutral and reverse. Soft Shift for PRM Gearbox Guidelines PDF.

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