Operating Instructions
Form No. 102546
Overload Safety Relief Valve Disc
The INLET and OUTLET sides of the hydraulic tester are protected from excessive pressure by a Safety Relief Disc
Assembly (#16230).
If tested pressure exceeds the hydraulic pressure listed below, the disc ruptures, relieving the oil pressure before
damage may occur. When the disc bursts, the case will be filled with hydraulic oil.
The Safety Relief Valve Disc Assembly (#16230) must be replaced after it has burst. See Parts List for location.
NOTE: An extra Safety Relief Valve Disc Assembly is supplied with each unit.
Safety Disc Burst Range
50 GPM Tester. . . . . . . . . . . . . . . . . . . . . . . . 5510/6093 P.S.I. @ 60°F.
5250/5835 P.S.I. @ 160°F.
OPERATING PROCEDURE
1. Connect the pressure hose from the hydraulic system being tested to the "INLET" port of the hydraulic tester.
2. Connect the return hose to the "OUTLET" port of the hydraulic tester. It may be connected in series.
3. The pressure gauge in this hydraulic tester should not be subjected to sudden surge or shock loads. Any
pressure applied to a hydraulic system being tested must be obtained by operating the hydraulic tester restrictor
valve.
IMPORTANT: Open restrictor valve before and after each individual application of pressure.
4. After oil is flowing through the hydraulic tester, gradually increase the pressure to the desired setting.
5. This hydraulic tester will measure pressures up to 5,000 PSI (345 BAR). If the system being tested has no safety
valve in the line and cannot withstand 5,000 PSI (345 BAR), the restrictor valve
MUST
be open when starting the
test and the maximum pressure must be controlled by the operator.
When testing a system's relief valve, refer to the equipment manufacturer's service manual to determine the relief
valve setting. Turn the hydraulic tester's pressure control valve knob clockwise until the proper relief valve setting has
been reached.
When performing a direct pump test (as shown in Figure 3)
NEVER increase the pressure beyond the system's
maximum relief valve setting or serious damage to the pump
under test may result! Remember...during a direct pump
test, the relief valve has been completely by-passed and it
no longer protects the pump from excessive pressure. Refer
to equipment manufacturer's specifications for maximum
relief valve pressure...DO NOT permit reading on tester's
high pressure gauge to exceed that pressure!
Before
testing the system, always open the pressure control
valve by turning the valve handle counterclockwise.
NOTE: The relief valve setting is easily recognized...the
pressure gaug e needle will fluctuate , indicating
unloading or by-passing of oil over the relief valve, and
the GPM indicator will show a decrease in flow through
the tester, indicating that the balance of pump output is
going through the relief valve. Then, to obtain an
accurate flow reading, turn the pressure control valve
knob counterclockwise until the pressure level is
SLIGHTLY under the relief valve setting.
Connect the inlet por t of the hydraulic tester to a "T"
connection installed between the pump and the directional
control valve (see Figure 4). Connect the outlet port of the
tester to the reservoir. Refer to manufacturer's specifications
for the test information.
Sheet No.
2 of 3
Rev. 3
Date: 27 Aug. 1996
