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Changing oil of Brinell hardness tester PHB-3000

                               Method of changing oil of Brinell hardness tester PHB-3000    

To use oil of correct type and viscosity is vital important. Mobile oil 1350 is the best( Saybolt 956 Secs at 100°F) and it can be bought locally. The spare hydraulic oil and the tools for changing the oil can be bought from manufacturer or retailer.

The procedures of changing the oil are a little complicated, change the oil strictly following the instruction. Any disoperation may result in permanent damage of the parts.

Procedures are as follows:                         

Screw off the cap and use the special wrench to take off the sac nut under the cap, and then take out the sac.

Open the pressure release valve. Turn the crank in order to make the whole indenter come into the test head body.

Close the pressure release lever.

Remove the screws which are fixed on the carriage.

Remove the test head, dump the old oil from the cylinder and then put the test head back on the carriage.

Fix the test head in the carriage and tighten the screws.

Fill sump with oid, align the oil level with the step of the cylinder.

Turn the pressure lever and push the indenter out. At this moment, the oil level will fall down. During the operation, keep the oil level and the step at the same level all the time. Add the oil while pushing out the indenter until the exposing part of indenter is 12-15mm.

Pump the ½ oil out of the sump with the injector.

Put back the sac. If there is some oil spilling form the sac, it means that the cylinder is full. If there is no spilling oil, take out the sac and add more oil again.

Put in the plastic cap. Quickly insert and fasten the sac nut tightly. Cover the cap and fasten it.

Open the pressure release lever.

Turn the crank and push in the indenter until the length of the exposing part of the indenter is 4-5mm.

Close the pressure release lever. Load test force to 3000kg. Open the pressure release lever.

Repeat the above processes for 5-10 times. It can get rid of the air which gets inside during changing oil in hydraulic system.

Clean the test head and carriage with soft cloth cleaning fluid and then reassemble test head.