TM 5-3805-260-24
Test 1: Maximum Pressure Relief Valve Setting
1. Open the manual load valve fully.
2. Move the ejector control lever to FORWARD position.
When the ejector cylinder is at the end of its stroke,
keep the control lever in FORWARD position.
3. With the engine at test rpm, slowly close the manual
load valve until oil flow through the flow meter stops
(0 gpm).
NOTE: The test rpm is given on the Procedure Data
Sheet, CHART A (Page 4-36).
4. Write down the pressure.
5. The setting for the relief valve for maximum
pressure must be according to the Service
Manual.
CAUTION: When the pressures are higher than 1000
psi, slowly open manual load valve before releasing the
control lever. This will prevent possible damage to the
pressure gauge.
Test 2: System Oil Temperature
1. Open the manual load valve fully.
2. Move the ejector control lever to FORWARD position.
3. Write down the oil temperature. Oil temperature must
be 150 5 F.
Test 3: System Base Flow Rate
1. Open the manual load valve fully.
2. Move the ejector control lever to the FOR- WARD
position. - When the ejector cylinder is at the end of
its stroke, keep the control lever in FORWARD
position.
3. Get the engine to test rpm.
4. Check pressure to make sure it is at a minimum value
of approximately 100 psi.
5. Write down the flow rate (gpm).
The base flow rate of the system will be the
same as the low pressure flow of the hydraulic pump.
Because there will be minimum leakage in the control
valves, lines and cylinder seals at low pressure, the base
flow rate can be used to find the flow differential in Tests
4 through 7.
Tests 4 through 7: Leakage Rates
These five tests are similar. Each test is done
as follows:
1. Move the control lever to the respective OPERATE
position. When the respective cylinder is at the end
of its stroke, keep the control lever in position.
2. Get the engine to test rpm.
3. Make an adjustment to the manual load valve to get
1000 psi pressure.
4. Then make the system constant with these
conditions.
5. Write down the flow rate (gpm) for each test.
The flow differential for each test (4 through 7) is
found by:
Subtract the flow rate (gpm) for each test from
the base flow rate (Test 3).
The percent of flow loss for each test (4 through
7) is found by:
Divide the flow differential for each test by the
base flow rate (Test 3) and multiply by 100.
Test 9: System Oil Temperature
1. Open the manual load valve fully.
2. Move the ejector control lever to the FOR-WARD
position.
3. Write down the oil temperature.
Make a comparison of the oil temperature from
Test 2 and 9. Test 2 must be 150 5F and Test 9 must
be inside of (within) 10 F of Test 2. For each 10° F
higher difference, subtract . 5 gallon per pump cartridge
from the leakage rate. For each 100 F lower difference,
add . 5 gallon per pump cartridge to the leakage rate.
EQUIPMENT INSTALLATION (Elevator System)
Tee locations for the elevator systems are
different from the tee location for the ejector and bowl
systems. A supply line tee block A9 and/or adapter must
be installed in the specified location for correct test
results. See the illustrations and schematics for the
specific machine.
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