Digital Hydraulic Testers
DHT Series 2
DHCR Series 2
Webtec Products Limited
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www.webtec.co.uk
Page 1: ...Digital Hydraulic Testers DHT Series 2 DHCR Series 2 Webtec Products Limited Digital Hydraulic Testers Operating Manual www webtec co uk...
Page 2: ......
Page 3: ...3 The tester should be connected to the hydraulic circuit by means of flexible hoses DHT 1 2 metre long and DHCR 1 4 metre long The use of quick disconnect couplings can save time Make sure the hoses...
Page 4: ...ssure increases on all circuits On one circuit Fails to hold load Pump cavitation caused by a Clogged suction filter b Restricted suction line c Air leak in pump suction line fittings shaft seals etc...
Page 5: ...arrow When the flow rate falls below the minimum allowable L is indicated on the display When flowrate exceeds the maximum H is indicated on the display Tachometer RPM is displayed in the right hand s...
Page 6: ...th directions of flow The loading valve has two easily replaceable safety discs located in the valve assembly which internally protect the tester and machine in both flow directions Accessories An inf...
Page 7: ...e the FAST key to increment the number above the cursor Press UNITS to move to the next column After entering the calibration factor press UNITS until the display overflows The display will now show t...
Page 8: ...tlet 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 bec...
Page 9: ...oceed with required test procedure see paragraph 3 0 or 4 0 2 6 Keep a record of flow readings at various operating pressures for comparison of test results The machine Manufacturer s service manual s...
Page 10: ...pump and control valve then connected to the IN port of the Tester The OUT port of the tester is connected back to the tank Make sure the loading valve is open Note Typically an elbow may be changed...
Page 11: ...ating condition pressure and flow measurements should be the same as in the pump test paragraph 3 0 4 332 If the decrease in the flow of any control valve position is noted leakage is indicated in thi...
Page 12: ...e taken by the cylinder to reach full stroke Compare all readings with manufacturer s recommended figures If flow is correct but time to extend cylinder is greater than expected leakage across the cyl...
Page 13: ...rt the pump and bias the directional valve to allow flow to the inlet port of the tester Slowly close the loading valve by turning clockwise and note the flow and pressure If the flow is below the man...
Page 14: ...a convenient position on the shaft pulley or coupling which has a minimum diameter of 35 mm 1 4 inches Larger diameter shafts will give better results particularly at high speeds The surface should b...
Page 15: ...anic solvent Turbine should revolve freely when blown along flow straightener E Ensure the turbine block is also free of debris Replace the turbine assembly ensuring the clipped corner of the flow str...
Page 16: ...fail the loading valve becomes inoperative and the oil flows freely downstream To replace the discs remove the cartridge assembly by unscrewing the 1 3 8 AF hexagon Unscrew internal holder in cartrid...
Page 17: ...igned to rupture internally at approximately 7 bar 100psi over the maximum pressure When the discs fail the loading valve becomes inoperative and the oil flows freely downstream To replace the safety...
Page 18: ...designed to rupture internally at approximately 100psi 7 bar over the maximum pressure When the discs fail the loading valve becomes inoperative and the oil flows freely downstream To replace the saf...
Page 19: ...8 x 25 x 43 mm PP3 UK 64F22 Europe 6AM6 Japan A1604 USA Note Tester Displays lpm USgpm and IMPgpm Consult sales office for intermittent operation up to 420 bar 6 000 psi Specification Pressure Gauge 0...
Page 20: ...ec co uk Certificate No 8242 Webtec Products Limited 1290 E Waterford Avenue Milwaukee WI 53235 USA Tel 414 769 6400 Fax 414 769 6591 e mail sales webster inst com http www webster inst com Webster In...
