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TM 10-3930-671-24
1.
Remove two screws and shield from frame.
2.
Clean the steering hose fitting and connect the
pressure gauge to the steering line and pump
fitting.
3.
Start the engine and let it warm up until it runs
smoothly.
4.
Check steering system relief pressure setting at
full throttle. Accelerate engine to no-load
governed speed (full throttle) and hold at this
speed while taking the pressure readings.
5.
Turn the steering handwheel in one direction
until steering cylinder reaches its stop (relief
bypass). Hold steering handwheel in relief
position until pressure reading is taken, and then
release.
CAUTION
Do not operate system over relief bypass any
longer than required to read the pressure gauge
or damage to equipment may result.
6.
When the steering system relief pressure
reading has been obtained, turn the engine off.
Pressure should read between 1200-1300 psi
(82708960 kPa).
7.
To adjust steering pressure relief valve, proceed
as follows:
a.
Carefully remove the core plug of the
steering pressure relief valve on the main
pump by prying the plug out.
b.
Clockwise adjustment of the relief valve
seat raises the pressure setting at which
the
valve
relieves
pressure;
counterclockwise adjustment lowers the
pressure
setting
at
which
the
valve
relieves pressure.
3.
Restart engine and repeat steps to read and
adjust the relief pressure setting until correct
relief pressure is set.
a.
Once you adjust to the correct pressure
setting, reset the core plug in the valve
bore.
b.
If the correct relief pressure cannot be
gained, consider overhauling or replacing
both the priority valve and the pressure
relief valve.
9.
Disconnect the pressure gauge and install the
shield on the frame with two screws. Tighten
screws 177-221 lb-in (20-25 Norm).
F-404
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