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Newage PRM
Marine Transmissions - PRM120 |
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PRM120 |
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The
PRM120 gearbox is designed for use in
pleasure craft where a simple lightweight
transmission is required. |
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PRM120 Nominal Power Ratings |
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Ahead
Ratio |
Pleasure
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Light
Commercial |
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BHP
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kW
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BHP
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kW
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2.04:1
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1.67 |
1.25 |
0.91
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0.68
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2.50:1
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1.34 |
1.00 |
0.91
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0.68
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2.94:1
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1.11 |
0.83
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0.77 |
0.58
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Max.
Input Power |
67
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50
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47 |
35 |
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Maximum operating speeds : 5000 rev/min |
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Note: These
powers are expressed in BHP and kW per 100
rev/min engine operating speed, and are
measured at the engine flywheel. Ratings
have been established to ensure the long
trouble free life of the gearbox which
should not, therefore, be used at powers in
excess of those shown. |
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PRM120 -
Simple Mechanical Operation - Lightweight,
Compact & Rugged |
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The PRM120 gearbox is
designed for use in pleasure
craft where a simple
lightweight transmission is
required.
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The cone clutches for both
ahead and astern are
mechanically operated and
require no adjustment.
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The gearbox is purpose built
to operate with standard
rotation engines i.e.
providing a clockwise
rotation of the gearbox
input shaft when viewed on
input. In forward drive the
output shaft rotates
opposite to input shaft
therefore requiring a right
hand propeller.
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The reduction ratios offered
are 2.04:1, 2.5:1 and 2.94:1
with a common astern ratio
of 2.5:1
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The heavy duty aluminum
gearcase is externally
ribbed for strength and heat
dissipation.
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Direction actuation is by a
lever with positive detent
positions for ahead, neutral
and astern. It is suitable
for use with proprietary
remote control operating
systems which must be of the
single lever dual action
type, i.e. MORSE MT3 or SL3
which operates the engine
throttle in conjunction with
the gearlever.
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PRM120 -
Service Classification Definitions -
Pleasure |
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Limited to craft used
exclusively for pleasure
boating; operation at full
engine throttle should not
exceed 5% of total time,
with balance of usage at 90%
of full throttle engine
speed, or less. Maximum
operation 500 hours per
year. The selection of
PRM120 according to this
classification for any
commercial boat is not
approved by PRM Marine Ltd.
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PRM120 -
Service Classification Definitions - Light
Commercial |
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Planing or semi-displacement
craft used in pleasure or
commercial applications may
qualify for light commercial
rating if annual usage is
less than 1500 hours and
full throttle operation is
limited, with most operating
time at partial throttle.
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Important to
Note: |
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It is essential for the
engine, transmission model,
reduction ratio and
propeller size to be
correctly matched so that
the engine can attain its
rated speed appropriate to
the relevant service
classification without
labouring.
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It is also necessary to
ensure the torsional
compatibility of the
complete propulsion system
from engine through to
propeller, since
disregarding this may result
in gear noise, particularly
at low speed operation, and
may even result in damage to
the engine as well as the
transmission components.
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Trans Atlantic Diesels will
provide all possible
information and assistance
to help find solutions to
potential torsional
problems, but it is the
ultimate responsibility of
the person assembling the
drive and driven equipment
to ensure that they are
torsionally compatible.
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Back to
Newage PRM Marine Transmissions |
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