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 yachts, motor sailors or motor boats.

In heavier duty applications such as commercial fishing, harbour boats, boat hire etc. 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 10Beta 14Beta 16Beta 20Beta 25Beta 30Beta 35Beta 38Beta 45T
TMC 401.50:1
2.00:1
2.60:1
StandardStandardStandardStandardStandardStandard---
TMC 602.00:1
2.45:1
2.83:1
-ExtraExtraExtraExtraExtraStandardStandardStandard
Oil Cooler for LH in ahead-ExtraExtraExtraExtraExtraExtraExtraExtra
TMC 60A2.00:1
2.45:1
-StandardStandardStandardStandardStandardStandardStandardStandard
PRM Marine (Mechanical Gearbox)RatioBeta 10Beta 14Beta 16Beta 20Beta 25Beta 30Beta 35Beta 38Beta 45T
PRM 902.04:1
2.50:1
StandardStandardStandardStandardStandardStandard---
PRM 1252.04:1
2.50:1
2.94:1
-----ExtraStandardStandard-
PRM Marine (Hydraulic Gearbox)RatioBeta 10Beta 14Beta 16Beta 20Beta 25Beta 30Beta 35Beta 38Beta 45T
PRM 1502.09:1
2.82:1
StandardStandardStandardStandardStandardStandardStandardStandardStandard
PRM 2801.96:1
2.94:1
-----ExtraExtraExtraExtra
PRM 260C Inline1.96:1
2.94:1
-----ExtraExtraExtraExtra
ZF (V Drive Gearbox)RatioBeta 10Beta 14Beta 16Beta 20Beta 25Beta 30Beta 35Beta 38Beta 45T
ZF 15 MIV2.13:1
2.64:1
3.00:1
StandardStandardStandardStandardStandardStandardStandardStandardStandard
Technodrive (Mechanical Gearbox)RatioBeta 43Beta 50Beta 60Beta 70TBeta 75Beta 85TBeta 90TBeta 105TBeta 115T
TMC 602.00:1
2.45:1
StandardStandard-------
TMC 60A2.00:1
2.45:1
StandardStandard-------
Oil Cooler for LH in aheadExtraExtra-------
TMC 2602.00:1
2.47:1
2.88:1
ExtraExtraStandard------
Technodrive (Hydraulic Gearbox)RatioBeta 43Beta 50Beta 60Beta 70TBeta 75Beta 85TBeta 90TBeta 105TBeta 115T
TM 3452.00:1
2.47:1
ExtraExtraExtraStandardStandardStandard---
TM 345A2.00:1
2.47:1
ExtraExtraExtraExtraExtraExtra---
Trolling Valve for TM 345ExtraExtraExtraExtraExtraExtra---
TM 932.09:1
2.40:1
2.77:1
---ExtraExtraExtraStandardStandardStandard
TM 93A2.09:1
2.40:1
---ExtraExtraExtraExtraExtraExtra
Trolling Valve for TM 93---ExtraExtraExtraExtraExtraExtra
PRM Marine (Hydraulic Gearbox)RatioBeta 43Beta 50Beta 60Beta 70TBeta 75Beta 85TBeta 90TBeta 105TBeta 115T
PRM 1502.09:1
2.83:1
StandardStandardStandard------
PRM 2801.96:1
2.94:1
ExtraExtraExtraStandardStandardStandardStandardStandardStandard
PRM 260C Inline1.96:1
2.94:1
ExtraExtraExtraExtraExtraExtraExtraExtraExtra
PRM 5001.94:1
2.57:1
2.90:1
--ExtraExtraExtraExtraExtraExtraExtra
Hydraulic 'Soft Shift'ExtraExtraExtraExtraExtraExtraExtraExtraExtra
ZF (Mechanical Gearbox)RatioBeta 43Beta 50Beta 60Beta 70TBeta 75Beta 85TBeta 90TBeta 105TBeta 115T
ZF 25M1.88:1
2.74:1
StandardStandardStandard------
ZF (Hydraulic Gearbox)RatioBeta 43Beta 50Beta 60Beta 70TBeta 75Beta 85TBeta 90TBeta 105TBeta 115T
ZF 251.97:1
2.80:1
StandardStandardStandard-Standard----
ZF 25A1.92:1
2.29:1
2.71:1
StandardStandardStandard-Standard----
ZF 452.20:1
2.50:1
3.00:1
-ExtraExtraExtraExtraStandardStandardStandardStandard
ZF 45A2.03:1
2.43:1
-ExtraExtraExtraExtraStandardStandardStandardStandard
ZF (V Drive Gearbox)RatioBeta 43Beta 50Beta 60Beta 70TBeta 75Beta 85TBeta 90TBeta 105TBeta 115T
ZF 15 MIV2.13:1
2.72:1
StandardStandard-------
ZF 63 IV1.99:1
2.48:1
ExtraExtraStandardStandardStandardStandardStandardStandardStandard

Optional ‘Soft Shift’ for PRM Gearboxes

Suitable for PRM 260, 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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