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2.6
Keep a record of flow readings at various operating pressures for comparison of test
results. The machine Manufacturer's service manual should be consulted.
Pump
3.0 Test 1 - PUMP IN LINE TEST (See Test Diagram A1) using DHT or DHC
3.1
Install the Tester into the system between the pump outlet port and the inlet to the
directional control valve.
3.2
Open Tester loading valve to read maximum pump flow at minimum pressure.
3.3
Close loading valve slowly to increase pressure and note reduction of flow as the
pressure is increased to maximum pump pressure to determine pump condition.
3.4
Pump flow at rated pressure can now be checked against the pump manufacturer's
specifications. The decrease in flow from the minimum pressure to maximum
pressure determines the pump condition. Typically a worn or damaged pump will lose
20 - 30 percent. A pump that delivers low flow at both minimum and maximum
pressure indicates suction problems. Blocked suction filters and pump cavitation
problems can also be checked by recording the pump flow at various engine speeds.
3.5
The tester can be used at several points in the circuit and the machine can be used
under its normal working conditions to evaluate the performance of the circuit
elements, such as pump, control valve, cylinder and hydraulic motor.
Cylinder
Relief
Valve
DHT
Drawing A1
6
Directional Valve
Test Hose
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