Olympic 820, Manual

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General Information
Introduction
This manual will give you information regarding the
installation, operation, and maintenance of the
U360 Steerable Strut Drive.
The efficiency of a unit and the length of service it
gives are in the hands of the operator of this
equipment.
Inspection and preventative
maintenance measures carried out on a regular
schedule will insure long and trouble-free operation.
It is, therefore, to the operator’s advantage to study
and to follow the outlined installation and
maintenance instructions.
For warranty protection, your drive must be
installed to the specification outlined in this manual
and be equipped with a 7-500-235 coupling
assembly and shear pin. Shear pins must meet
Hydro Drive Specifications (Part No. 1030-11).
Description
The U360 Strut Drive is a propulsion system which
is equipped with a propeller strut which can be
rotated continuously through a full 360° so that full
thrust can be directed in any direction.
The drive consists of six functional assemblies: the
upper housing assembly, center housing assembly,
vertical
housing assembly, lower housing
assembly, hydraulic system assembly, and power
steering assembly.
The drive is rated for 100 horsepower at 2400 RPM
continuous operation and for 130 horsepower at
2800 RPM intermittent operation. The output shaft
of the engine must rotate counter-clockwise when
looking at the end of the shaft. Drive weight is 370
pounds, including oil.
Power is transmitted from the engine to the drive
through a two-joint assembly incorporating a slip
joint together with a tubular connecting shaft. The
drive input flange must be equipped with a torsional
vibration damper. For trouble-free operation, the
drive and engine must be carefully aligned.
The propeller is driven through two sets of spiral
bevel gears. One set of gears is locked in the upper
housing and the second in the lower housing. The
total reduction ratio is 2:1.
The hydraulic system is comprised of a high-
pressure oil pump, oil filter, oil cooler, reservoir tank
and steering motor. The hydraulic system includes
the lubrication system and power steering system.
The high-pressure pump delivers constant power to
the steering motor at all times. The pump also
circulates the lubrication oil throughout the drive.
Steering ratio is 1:1 (360° rotation of the steering
wheel gives 360° rotation of the lower unit).
Normal operating pressure range of this system is
between 2 and 10 PSI, a higher pressure will
indicate a clogged oil filter only.