FLOW METER TEE TEST PROCEDURE IX
TM 5-3805-263-14&P-3
6. The indication on the pressure gauge is the
4. Then make the system constant with these
pressure which opens the relief valve. The
conditions.
pressure setting for the relief valve is in the
5. Make a record of the flow rate (gpm) for each
Service Manual. Turn the manual control valve
Test (4 through 19).
to the OPEN position immediately after reading
the pressure gauge.
If the machine has more hydraulic implements
7. Stop the engine and loosen the fill cap on the
make tests and records for them like the tests and
hydraulic tank to relieve any pressure. Tighten
records for Tests 4 through 19.
the cap. Remove the 5P2683 Stop from the end
of the pump and install the plug.
NOTE
Immediately after making Tests 4 through 19, make
WARNING
the oil temperature Test 20.
The 5P2683 Stop must be
removed immediately after the
The difference for each Test 4 through 19 is
made by taking the flow rate (gpm) for each test away
test is made. If the stop is not
from the Test 3 base flow rate. The percent of flow loss
removed and the engine is
for each Test 4 through 19 is made by dividing the flow
started the maximum output
difference for each test by the Test 3 base flow rate and
(gpm) of the pump will cause
multiplying by 100.
damage to the hydraulic
system.
Test 20: System Oil Temperature (after leakage tests)
Test 2: System Oil Temperature
1. Turn manual control valve to the OPEN position.
2. Run the engine at test rpm.
1. Turn the manual control valve to the OPEN
3. Make a record of the oil temperature.
position.
2. Run the engine at test rpm.
Make a comparison of the oil temperatures for
3. Make a record of the oil temperature. Oil
Test 20 and Test 2. Test 2 oil temperature must be 150
temperature must be 150 5F.
5F and Test 20 must be inside of (within) 10F of
Test 2, If there is more than 10F difference, the flow
Test 3: System Base Flow Rate
difference (gpm leakage) must be corrected for each
Test 4 through 19.
1. Turn the manual control valve to the OPEN
position.
For each 10F difference multiply it with .5
2. Run the engine at test rpm.
gallons. If the oil temperature for Test 20 is more than
3. Look at the pressure gauge. Make sure the
Test 2, take the result of the multiplication from the flow
pressure is not more than 100 psi.
difference (gpm leakage) for each Test 4 through 19. If
4. Make a record of the oil flow (gpm).
the oil temperature for Test 20 is less than Test 2 add
the result of the multiplication to the gpm leakage for
The base flow rate of the system will be the
each Test 4 through 19.
same as the low pressure flow of the hydraulic pump.
Because there will be a minimum leakage in the control
Test 21: Maximum Oil Pressure for PUMP (First
valves, lines and cylinder seals at low pressure, the base
Stage)
flow rate can be used to find the flow difference in Tests
4 through 19.
1. Run engine at test rpm.
2. Turn manual control valve slowly toward the
Tests 4 through 19: Leakage Rates
CLOSED position.
3. Make a record of the maximum oil pressure
These sixteen tests are similar.
Each test is
seen on the gauge. The pressure must be like
done as follows:
the specification for the test.
1. Run the engine at test rpm.
Test 22: Maximum Oil Pressure for PUMP (Second
2. Move a control lever to its respective OPERATE
Stage)
position.
3. Turn the manual control valve to get a pressure
1. Run engine at test rpm.
of 1000 psi.
2. Hold blade lift control lever in RAISE position.
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