5
Instructions for using the portable hydraulic
tester models - DHT & DHC
0.0 The Tester is designed to measure flow, pressure and temperature. It can take full system
pressure up to 420 bar (depending on model) and measure flow in both directions for motor
and cylinder testing.
0.1 Make all tests at operating temperatures because as the oil temperature increases it
becomes thinner and any internal leakage becomes greater.
0.2 Testing will be easier and faster if quick disconnect couplers are used to attach the Test
Unit.
0.3 There are two basic test ‘set-ups’ when using either the DHT or DHC or Testers:
A) The In Line test to check out pumps, entire systems and also monitoring operating
conditions
B) The Tee Test to check out pumps, directional control valves and overall system
condition.
0.4 A preliminary check of the hydraulic system’s oil supply, pump rotation, filters, oil lines,
cylinder rods as well as looking for external leaks should be made prior to installing the
hydraulic tester.
1.0 INSTALLING THE TEST UNIT
1.1
Connect the Tester to the circuit, see page 22 for Port Sizes. The inlet and outlet ports
are marked on the turbine block. Use hoses and fittings of sufficient diameter for the
flow being tested. Avoid restrictions at inlet and outlet ports of the Tester. Also avoid
sharp bends because at high pressure hoses will deflect and straighten under
pressure.
1.2
When the pressure loading valve is used ensure it is fully opened by turning the knob
counter clockwise.
1.3
When no flow is passing through the turbine, the display will read “L” for “LOW” flow.
1.4
Continue tests as specified for the hydraulic tester.
2.0 STANDARD TEST CONDITIONS
2.1
Position the Hydraulic Test Unit as described in paragraph 3.0 and 4.0
2.2
Open loading valve. (Rotate counter-clockwise) and select high flow range.
2.3
Start pump momentarily to ensure that oil flows freely through the hydraulic system,
then run pump at normal maximum speed. Do not change pump speed while using
the loading valve.
2.4
Slowly close Test Unit Loading Valve to develop desired pressure. Run the machine
until normal operating temperature is reached.
2.5
Open the Testing Loading Valve and proceed with required test procedure (see
Paragraph 3.0 or 4.0).
