ports worn excessively, you should renew the hydraulic oil and filters or strainers or
clean them. The trial run procedures are as follows:
(1) Install a pressure gauge in the pressure pipeline as near to the pump as
possible.
(2) Place the control valve in its neutral position and run the pump at 500 to
2
1000rpm. The reading on the gauge should be slightly lower than 1MPa (or 10kg/cm )
and the pump runs for ten minutes.
(3) Increase the speed of the pump to 1500 to 2000rpm without load for ten
minutes.
(4) Without the change of the speed I step(3), increase the pressure to 2 to 3MPa
2
(or 20 to 30kg/cm ) and run the pump for five minutes. Then increase the pressure to
maximum with loading the relief valve. Each circuit works for five minutes and then
renew or clean the element of return filter. During the increase of the pressure, observe
the change of oil temperature and pump body surface temperature and working voice.
If the oil temperature or pump body surface temperature is excessively high, discharge
the pump to adjust the temperature.
(5) After finishing above-mentioned procedures, recover the relief valve and do
the discharge test.
(6) No matter what the relief valve is loaded or not, the pump should be to pass
the discharge test to ensure that the pump runs at proper speed.
Fig.9-18 show the sketches of hydraulic pipeline.
-86-
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