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Diesel Marine Propulsion Engines & Marine Generating Sets

Gearbox Options

Beta Marine offer the following gearbox options and reduction ratios. We have selected suitable gearboxes to match the torque loading of each engine, and this will be correct for the majority of yachtsmen and canalboat owners.

Some customers, such as commercial fishermen, hire companies etc., may require a heavy duty gearbox and /or different reduction ratios to suit their heavy duty requirements, if you have any questions then please ask and we will be pleased to discuss it with you.

We can also mount your old / existing gearbox on a new Beta engine, if you wish to send it to us. For further information on a specific gearbox, please look at the individual manufacturer’s websites for information:

Technodrive (Twin Disc) ZF
PRM Marine
GearboxRatioBeta 14Beta 16Beta 20Beta 25Beta 30Beta 35Beta 38
Technodrive (Mechanical Gearbox)
TMC 401.50:1
2.00:1
2.60:1
StandardStandardStandardStandardStandard--
TMC 602.00:1
2.45:1
2.83:1
ExtraExtraExtraExtraExtraStandardStandard
Oil Cooler for LH in aheadExtraExtraExtraExtraExtraExtraExtra
TMC 60A2.00:1
2.45:1
ExtraExtraExtraExtraExtraExtraExtra
PRM Marine (Mechanical Gearbox)
PRM 802.04:1
2.50:1
StandardStandardStandardStandardStandard--
PRM 1202.04:1
2.50:1
2.94:1
ExtraExtraExtraExtraExtraStandardStandard
PRM Marine (Hydraulic Gearbox)
PRM 1502.09:1
2.82:1
--ExtraExtraStandardStandardStandard
PRM 2601.96:1
2.94:1
----ExtraExtraExtra
ZF (V Drive Gearbox)
ZF 15 MIV2.13:1
2.64:1
3.00:1
StandardStandardStandardStandardStandardStandardStandard
GearboxRatioBeta 43Beta 50Beta 60Beta 75Beta 85Beta 90Beta 105
Technodrive (Mechanical Gearbox)
TMC 602.00:1
2.45:1
StandardStandard-----
TMC 60A2.00:1
2.45:1
ExtraExtra-----
Oil Cooler for LH in aheadExtraExtra-----
TMC 2602.00:1
2.47:1
2.88:1
ExtraExtraStandard----
-
Technodrive (Hydraulic Gearbox)
TM 3452.00:1
2.47:1
ExtraExtraExtraStandard---
TM 345A2.00:1
2.47:1
ExtraExtraExtraExtraStandard--
Trolling Valve for TM 345ExtraExtraExtraExtraExtra--
TM 932.09:1
2.40:1
2.77:1
---ExtraExtraStandardStandard
TM 93A2.09:1
2.40:1
---ExtraExtraExtraExtra
Trolling Valve for TM 93---ExtraExtraExtraExtra
PRM Marine (Hydraulic Gearbox)
PRM 1502.09:1
2.83:1
StandardStandard----
PRM 2601.96:1
2.94:1
ExtraExtraStandardStandardExtraStandardStandard
PRM 5001.94:1
2.57:1
2.90:1
--ExtraExtraExtraExtraExtra
PRM 7501.94:1
2.57:1
2.90:1
3.94:1
-------
PRM 10002.86:1
4.00:1
-------
Hydraulic 'Soft Shift'ExtraExtraExtraExtraExtraExtraExtra
ZF (Mechanical Gearbox)
ZF 25M1.88:1
2.74:1
StandardStandardStandard----
ZF (Hydraulic Gearbox)
ZF 251.97:1
2.80:1
StandardStandardStandardStandard---
ZF 25A1.92:1
2.29:1
2.71:1
StandardStandardStandardStandard---
ZF 45-12.20:1
2.50:1
3.00:1
--ExtraExtraExtraStandardStandard
ZF 45A2.03:1
2.43:1
--ExtraExtraExtraStandardStandard
ZF (V Drive Gearbox)
ZF 15 MIV2.13:1
2.72:1
StandardStandard-----
ZF 63 IV1.99:1
2.48:1
ExtraExtraStandardStandardExtraStandard-

Gearbox Information Downloads

If you have any questions please do not hesitate to contact us.
Beta Marine Gearbox Information Sheet – Gearbox Information Sheet.

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