TM 55-4920-384-13&P
(7) Place selective valve in RESERVOIR posi-
g. Testing Pressure Gages.
tion.
(1) Connect a pressure gage of known accu-
racy to the high pressure gage test port.
(8) Open by-pass valve.
(9) Start test stand. Set compensator to 2 gpm
(2) Start the test stand and compare the
for two (2) minutes to purge air from filter.
readings of both the test gage and the high pressure
gage. Readjust the stand gage or replace if
necessary.
f. Hose Assemblies.
(1) Remove high pressure hose between the
pump outlet and the check valve. Drain fluid into
h. Hydraulic Fluid Overheat Thermoswitch.
container when disconnecting the hose.
(1) Set switch at 100 F.
(2) Remove the two (2) hose assemblies at-
(2) Rotate dial right to 140 degrees then start
hose assemblies are stored in the compartment at
(3) Set pressure at 3000 psi with flow at 10
the rear of the test stand when not in use. (fig. 1-3).
GPM, then open by-pass valve until pressure drops
(3) Clean the hose assemblies in an approved
to 2000 psi.
cleaning solvent and dry thoroughly.
(4) Inspect the hose assemblies for frayed or
closely, when temperature reaches 158 degrees F
worn hose. Inspect the fittings of the hose assem-
slowly rotate dial on temperature control (2 fig. 1-9)
blies and the drain assembly for damaged threads.
until engine stops 162 F.
Replace a defective hose assembly or drain assem-
bly.
NOTE
(5) Pressure test hoses to required pressures
This method is used to coordinate
400 psi to 5000 psi per a reliable test stand, no leaks
temperature control with temperature
allowable.
gage an instrument control panel.
Section IV. PREVENTIVE MAINTENANCE
To insure that the equipment is ready for oper-
or failure, The necessary preventive maintenance
ation at all times, it must be inspected system-
services will be performed before operation. Defects
discovered during operation of the unit will be noted
atically before operation, during operation, and
after operation, so that defects may be discovered
for future correction to be made as soon as operation
and corrected before they result in serious damage
has ceased.
Section V. TROUBLESHOOTING
3-3. Troubleshooting. This section provides in-
trouble symptom stated in Table 3-2, is fol-
formation useful in diagnosis and correction,
lowed by a list of probable causes of the trou-
inspection, operation, or failure of the hydrau -
ble. The possible remedy recommended is de-
lic test stand, or any of its components. Each
scribed opposite the probable cause.