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TM 55-1905-217-12
(4) Place the oil cooler cover against the oil cooler
Install engine oil filter bracket and filter.
element with the matchmarks in alinement, and install
Fill the engine cooling system.
two bolts and lockwashers to hold the cover and element
Start the engine and check for oil and water
in place.
(5)  Install the remaining bolts and lockwashers.
(10) Check the oil level in the marine gear.
Tighten the bolts to 13-17 ft-lb torque.
Add oil if necessary.
(6)  Attach the two oil tubes to the end of the oil
cooler cover.
4-74. Service
a. If an oil leak should develop, gaskets (26, fig. 4-61)
Power developed by the two engines is delivered through
the hydraulic marine gear system to the drive gear (4, fig.
and (11) can be replaced by removing the
4-61), thence to the power driven gear (32) and power
appropriate cover.
driven shaft (13).  The power transfer gear is splash
lubricated with oil in the marine gear system.
b. If major repairs are needed, transfer gear
'assembly must be removed from the engine. Refer to
higher echelon.
4-75. General
a. The hydraulic steering systems for these craft
The hull numbers 8500 thru 8519 steering
are similar, but some components are different. See
system is designed to be supplied by one pump.
figure 1-9 for diagram of hull numbers 8500 thru 8519
Using both pumps will only cause a doubled by-
steering system or figure 1-10 for diagram of hull
pass flow resulting in excessive heating of oil.
numbers 8520 thru 8539 steering system. See figure 1-11
The steering system pump discharge valves (fig.
for diagram of hull numbers 8540 thru 8560 and 8580
223) should be set with one valve open and one
thru 8618 steering system. Hull numbers 8540 thru 8560
valve closed.
and 8580 thru 8618 incorporate a closed system. Return
lines from the actuating cylinders and counterbalance
valves return hydraulic fluid to the steering reservoir.
The hull numbers 850o thru 8560 and 8580 thru
The hydraulic steering systems use medium
8618 steering system is designed to use the flow
pressure hydraulic oil to actuate cylinders which position
from both pumps. However, this system will
the rudders. Oil is supplied by the hydraulic pumps to the
function with only one pump operating.
helm unit which is the principal metering and directional
controlling device. By directing hydraulic oil to one side or
4-76. Filling Hydraulic Steering System with Fluid
the other of the cylinders they will extend or retract giving
a. General. The hydraulic oil for this system should
the desired position to the rudders.
be a high grade oil compounded for use in a hydraulic
c.  The helm unit and other valves control the
system. Recommended oils are 2135 TH., MIL-17672B;
'direction and volume of flow of hydraulic oil. The relief
and 2075 TH., MIL17672B.
valve protects the system by limiting hydraulic oil
pressure. The flow control valve (flow divider)'limits the
b. Filling Hydraulic Steering System, hull numbers
volume of oil to the value at which this system is
8500 thru 8519.
designed to work. The flow control valve (flow divider)
(1)  Fill this system through the fill-vent cap in
divides the oil supplied into two flows (2.5 gpm hull
the pilot house expansion tank. Open valves (fig. 2-16
numbers 8500 thru 8518, 2 gpm hull numbers 8520 thru
and 2-27) at bottom of each tank and open the vent pet
8560 and 8580 thru 8618) to the helm unit, and the
cock on the storage tank (in engine room). Fill until oil
remainder returned to the storage tank.
appears at the vent pet cock, then close it. Continue
filling the expansion tank until it is full (check sight glass).
(2)  Open all ball valves in the system. Pre-fill
suction lines and pumps by loosening pump discharge
hoses at the union swivel. Turn pumps


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