FLOW METER TEE TEST PROCEDURE IX
TM 5-3805-263-14&P-3
2. Turn manual control valve slowly toward the
RECOMMENDATION FOR ACTION:
CLOSED position to get a pressure of 1000 psi.
3. Make a record of both the oil temperature and
Do blocked hydraulic cylinder tests like the Tests
the flow rate (gpm).
38 through 57. If the leakage is still too much the
problem is in the lock check valve for the hydraulic
Make a comparison of the records on these tests
cylinder.
with the data on Chart C for the specific machine under
test. The information on Chart C is the maximum for
PUMP TEST (CHART C)
best performance.
This test is used to find the efficiency of
the
Troubleshooting
hydraulic pump. Install a Blocking Cap and Plug in
the
pressure line from the hydraulic pump. This keeps
the
PROBLEM:
Percent of flow loss for Test 25 is 5%
oil out of the hydraulic system. All of the oil from
the
pump now goes through the flow meter.
or MORE; for Test 4 through 19, it is
10% or MORE.
WARNING
Turn the manual load valve to
PROBABLE REASON:
the OPEN position before
Pump has a problem and leakage is in the
starting the engine. The main
control valves and/or the cylinders or motor.
relief valve is not in the circuit
for this Pump Test. If the
RECOMMENDATION FOR ACTION:
pressure gets too high, it is
possible to cause injury to
Find the pump problem.
Do the Blocked
personnel or damage to
Cylinder or Motor Tests to find leakage rate in control
equipment.
valves and/or cylinders or motor in pump system that has
too high percent of flow loss.
Test 24: Pump Flow at Low Pressure (Test rpm)
PROBLEM:
Percent of flow loss for Test 25 is 0 to
1. Turn the manual control valve to the OPEN
5%; for Tests 4 through 19, it is 10%
position.
or MORE.
2. Start and run the engine at Test rpm.
3. Turn the manual control valve slowly toward the
PROBABLE REASON:
CLOSED position to get a pressure of 100 psi.
4. Make a record of both the oil temperature and
Pump is in good condition but leakage is in the
the flow rate (gpm).
control valve and/or the cylinders or motor.
Test 25: Pump Flow at High Pressure (Test rpm)
RECOMMENDATION FOR ACTION:
1. Run engine at test rpm.
Do the Blocked Cylinder or Motor Tests to find
2. Turn the manual control valve slowly toward the
leakage rate in the control valve and/or the cylinders or
CLOSED position to get a pressure of 1000 psi.
motor.
3. Make a record of both the oil temperature and
the flow rate (gpm).
PROBLEM:
The percent of flow loss for Test 25 is
5% or MORE. Flow difference for
Test 26: Pump Flow at Low Pressure (Test rpm)
Test 25 is 0 to 2 gpm higher than the
flow difference for Test 27.
1. Run the engine at the test rpm.
2. Turn the manual control valve toward the OPEN
position to get a pressure of 100 psi.
PROBABLE REASON:
3. Make a record of both the oil temperature and
the flow rate (gpm).
Pump is worn.
Test 27: Pump Flow at High Pressure (Test rpm)
RECOMMENDATION FOR ACTION:
1. Run engine at test rpm.
When the flow loss is too high for the machine
application, install either a rebuilt or new pump.
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