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Mamba™ – WRG Reduction Gearboxes
The WRG series of high-effi ciency gearboxes employs precision cut, stub tooth form, spur gears running in deep groove ball
and roller bearings. Gear casings are manufactured from marine grade aluminium, and shaft work is in stainless steel or nickel
bronze alloy. All gearboxes are CNC machined and grease fi lled to ensure a perfect fi t and maintenance-free life.
Additional information
1 Mechanical advantage and turns lock to lock
are based on standard lever geometry
2 Overall mechanical advantage and turns lock
to lock can be altered via stepped ratio bevels
in bevelheads within the system or by non-
standard lever centers.
3 Reduction gearboxes can be mounted
anywhere within the general proximity of the
rudder stock (0.2m/7" to 2m/6.5') For more
details please refer to the installation and
maintenance handbook.
Gearbox (WRG12) Gearbox (WRG18) 4 Bevelheads can be directly integrated to all
WRG series gearboxes
5 For detailed dimensions contact your
Lewmar representative.
GEAR ADVANTAGE AT MID TURNS MAXIMUM TYPICAL
MECHANICAL GEARBOX TYPE RATIO SHIPS HO TO HO RUDDER TORQUE BOAT RANGE
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Mamba™ – Bevelhead Integration
Integration – WRG series of spur reduction gearboxes can be supplied
with an integral bevelhead fi tted to the input shaft as per illustrations
below. The bevelhead can be mounted to either side of the reduction
gearbox and rotated at any angle. Custom arrangements are available
with greater stand offs between the gearbox and bevelhead.
Pedestal Gearbox Integration
Mamba™ pedestal – BG WRG Integration – For larger aft cockpit yachts, the
WRG and BG series gearboxes can be directly mounted to the pedestal.
On the WRG12 gearbox and above – a torque adapter plate is provided to
transmit the force directly to the underside of the cockpit fl oor. Gearbox WRG type showing directional
For raked rudders (25° and above), it is normal to use the BG series of movement of outer lever and torque tubes
gearbox.
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