Hydraulic Maintenance

More than _____ of all hydraulically powered machine downtime and malfunctions are due to contamination in fluid.

• A. .1

• B. .25

• C. .5

• D. .35

The most common location for a filter is in the _____, where the filter cleans all fluid returning to the reservoir

• A. Pump

• B. Main return line

• C. Motor

• D. Reservoir

The _____ Contamination Code uses a code of three numbers to indicate the cleanliness of fluid, such as 21/18/15

• A. ISO 6604

• B. ISO 4406

• C. IOS 6604

• D. IOS 4406

The beta system is for rating _____.

• A. Pump efficiency

• B. Hydraulic filters

• C. Oil viscosity

• D. Hose capacity

The bypass check valve open on a filter is an indication line

• A. The system pressure is too high

• B. Filter has reached its capacity

• C. System has a decrease in flow

• D. The system is hot

A spin-on filter is used for _____ applications that include the return line and the suction line.

• A. High pressure

• B. All

• C. No

• D. Low pressure

A(n) _____ filter has a filter element enclosed inside a metal shield

• A. Pin-on

• B. Cartridge-type

• C. Suction strainer

• D. Pump

Hydraulic circuits usually have their strainer mounted _____.

• A. At the inlet to the circuit

• B. The outlet line of the pump

• C. Inside the reservoir

• D. On the outside of the tank

As a filter collects dirt, the _____ difference will grow, indicating that it is time to clean or replace the filter.

• A. Pressure

• B. Volume

• C. Flow

• D. Dissolved solids

Before installing the new filter element, apply a thin film of _____ to the filter seal to lubricate the seal

• A. Dirty oil

• B. Clean oil

• C. Motor

• D. Mineral oil