What a Hydraulic Tester Does
• If you cannot locate the trouble with the operational checks, check the system using a hydraulic analyzer or test gauges. Using this equipment, you can accurately measure oil flow, pressure, and temperature, and quickly isolate faulty components.
• Hydraulic analyzers are available with pressure loading valves, pressure gauges (high and low pressure), flow meters, and temperature gauges to precisely analyze a complex hydraulic system.
• In testing any hydraulic circuit, the following four checks are of prime importance:
Temperature - The oil should be checked for correct operating temperature to assure accuracy of the tests that follow.
Flow - The flow check determines if the pump is developing its rated output.
Pressure - Pressure checks test relief valves for proper operation. In a closed-center system, pressure checks indicate the operation of the main pump.
Leakage - The leakage test isolates leakage in a particular component.
These basic checks may be made with most hydraulic testers. Before beginning, however, read the instruction manual furnished with the tester and review the system. You should have a thorough knowledge of the machine's specifications (relief valve pressures, pump output, engine rpm, and operating temperature) to accurately test the system.
To test a machine, you must disconnect some of the oil lines. But remember, DIRT IS THE WORST ENEMY OF A HYDRAULIC SYSTEM. Before disconnecting oil lines, steam clean the machine. And be sure to plug all openings to keep out the dirt.