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 TM 55-1905-219-14-7
3-203. STEERING SYSTEM - MAINTENANCE INSTRUCTIONS.
The steering system consists of a Cub Hydraulic Pump Unit and the following associated components; a Rudder
Angle Indicator, a Flanking Rudder Limit Switch and a Steering Control Panel.
a.
Cub Hydraulic Pump Unit
1.
The Cub Hydraulic Pump Unit is a power source for hydraulic steering systems. This pump unit is used in
conjunction with control and follow-up equipment to make up a complete steering system.
2.
Variations of the basic pump unit are available to suit power requirements and needs of each particular
installation.
3.
The following description of the pump unit is taken in the order of flow of hydraulic fluid. Reer to the block
f
diagram of the system.
4.
This pump unit is mounted on a 10-gallon (37.85 liter) tank. A 100-mesh strainer located in the sump filters
the fluid.
5.
An electric motor drives the pump unit.
b.
Vane Pump.
1.
This pump is a rotary, single-stage sliding vane unit consisting of a housing and rotor assembly.
2.
The rotor has a series of slots into which are fitted movable vanes. As the rotor turns, the vanes are thrown
outward by centrifugal force to bear against the surface of an oval shaped ring (cam). As the vanes move across the
inlet chamber, the radius of the oval ring increases to create an increasing space between the rotor and the ring.
Atmospheric pressure acting upon the inlet fluid forces it into this space. Fluid is trapped between vanes as they move
past the inlet chamber. At this point, the radius of the contour decreases and the fluid is forced into the outlet chamber.
c.
Pump Relief Valve.
The pump relief valve is set to operate at a pressure which actsto divert oil back to the tank whenever the
pressure rises above the established point. The valve is set at installation and need not be readjusted.
3-3181
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