Page 362 - Lewmar

9. Steering

Mamba™ – Bevelheads

BH10 BH130 – For boats 60ft and above Additional information
Lewmar BH10 torque tubes are Lewmar BH130 torque tubes are 1 Steering shafts can be made to customer’s
preferred length
made of marine grade stainless steel made of marine grade stainless steel. 2 Bevelheads are available with either rotation
depending on the specifi c installation Depending on the specifi c installation 3 Standard bevelheads have 1:1 ratio, but other
requirements. Torque tubes are requirements, torque tubes are ratios are available as detailed in specifi cation
supplied in standard lengths with one supplied in standard lengths with one 4 Mounting plate (or bracket) can be fi tted to all
end loose for welding by the installer. end loose for welding by the installer. faces to facilitate ease of mounting
Or we offer fully welded torque Or we offer fully welded torque tubes 5 All bevelheads can be confi gured to accept
tubes to pre-specifi ed lengths. to pre-specifi ed lengths. the Lewmar direct fi t autopilot mount
6 For detailed dimensions contact a Lewmar
representative
7 Due to the custom nature of this product,
contact Lewmar for part number

Universal Joints

Must be fi tted at both ends of a torque tube. Where a self aligning bearing is used,
one universal joint connects both torque tubes, as shown in illustrations. Self aligning
bearings work up to an angle of 15°. AMK10 universal joints have a maximum
permissible working angle of 25°. Where practical, the angle at each joint should be
balanced.
Mamba Universal Joint and self
The WUJ6 universal joint is suitable for use with large gearboxes 18, 20 and 45, see
p191. aligning bearing
It has a maximum permissible working angle of 25°. Where practical, the angle at each
joint should be balanced.

Mamba™ – BG Reduction Gearboxes
The BG Series of high effi ciency reduction gearboxes employ bevel gears
manufactured from either high alloy steel or nickel bronze alloy running in precision
roller bearings. Gear casings are manufactured from marine grade aluminium and
shaft work is stainless steel or nickel bronze alloy. All gearboxes are grease fi lled and
shimmed for zero backlash.

MECHANICAL GEAR ADVANTAGE AT TURNS MAXIMUM TYPICAL
GEARBOX TYPE RATIO MIDSHIPS HO TO HO RUDDER TORQUE BOAT RANGE
 .  
 : : .    
 / : : .    
 . : . : . - '- '

Additional information Gearbox (BG12)
1 Mechanical advantage and turns lock to lock are based on standard lever geometry
2 Reduction gearboxes can be mounted anywhere within the general proximity of the rudder stock 0.2m/7" to 2m/6.5'
3 For detailed dimensions contact your Lewmar representative

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