| Tweet |
Custom Search
|
|
|
||
 TM 55-1905-221-14-1
4-18.
HYDRAULIC STEERING SYSTEM.
a. The hydraulic steering systems for the landing craft are Similar on all hull numbers. Paragraphs 4-19
through 4-23 contain instructions for components of the steering system.
b. The hydraulic steering systems use medium pressure hydraulic oil to actuate cylinders which position the
rudders. Oil is supplied by the hydraulic pumps to the helm unit which Is the principal metering and
directional controlling device. By directing hydraulic oil to one side or the other of the cylinders they will
extend or retract giving the desired position to the rudders. Return lines from the actuating cylinders and
counterbalance valves return hydraulic fluid to the steering reservoir.
c. The helm unit and other valves control the direction and volume of flow of hydraulic oil. The relief valve
protects the system by limiting hydraulic oil pressure. The flow control valve (flow divider) limits the
volume of oil to the value at which this system is designed to work. The flow control valve divides the oil
supplied into two flows [2.5 gpm (9.4646 I)]to the helm unit, and the remainder returned to the storage
tank.
NOTE
The steering system is designed to be supplied by one pump. Using both pumps will only cause a doubled
by-pass flow resulting in excessive heating of oil. The steering system pump discharge valves should be
set with one valve open and one valve closed.
4-49
|
||
|
||
