How to add hydraulic oil to Brinell hardness tester?

1. Turn off the power of the hardness tester and lower the test bench to the lowest point.
2. Add the hydraulic oil to the hardness tester to the specified amount.
3. Raise the test bench to the highest point and tighten the fastening screws of the test bench.
4. Turn on the power of the hardness tester and check whether the indication is normal.
5. Add hydraulic oil to it and wait until the check indicator light comes on.