Other Components

Parts of the oil tank and cooling

Point at a number or a part of the drawing.

1. 1Oil tank

   Steel reservoir for the machine’s oil. A baffle plate separates the return side from the suction side, so the oil settles and cools before the pump draws it again.

   Oil Tank / Hydraulic Reservoir

2. 2Suction filter

   Self-sealing filter on the pump’s suction line. A mesh element and a magnet catch dirt and iron particles before they reach the pump.

   Hydraulic Oil Filter

3. 3Hydraulic pump

   Draws oil from the tank through the suction filter and delivers it to the valves.

   Pumps & Motors (6)

4. 4Breather

   Filler cap with an air filter. It lets air in and out as the oil level changes and keeps dust out of the tank.

5. 5Return line

   Brings the oil back from the valves and cylinders through the cooler. It ends below the oil level, so the returning oil does not churn air into the tank.

6. 6Oil cooler

   Shell-and-tube heat exchanger: cooling water flows through the tubes and the oil around them, keeping the oil temperature steady.

   Oil Cooler / Heat Exchanger

7. 7Level gauge

   Sight glass on the tank wall, often with a thermometer, for checking the oil level and temperature.

8. 8Drain plug

   Magnetic plug at the lowest point of the tank, for draining the oil at oil changes. Its magnet also collects iron particles.