CLEANING INSTRUCTIONS CONTINUED
8. Machined Surfaces.
a. Clean machined surfaces with solvent cleaning compound.
9. Mated Surfaces.
a. Remove old gasket and/or sealing compound using a wire brush and solvent cleaning compound.
b. Lightly coat with oil and wrap all parts subject to rust before storing.
10. Rusted Surfaces. Clean all rusted surfaces using wire brush and crocus cloth.
11. Oil-Bathed Internal Parts. Wipe oil-bathed internal parts clean with a lint-free cloth.
12. Externally Exposed Parts. Wash externally exposed parts with detergent and water. Rinse thoroughly and
CLEANING AND FLUSHING HYDRAULIC SYSTEM
Use portable filter to remove contamination from hydraulic system. Refer to Cleaning Hydraulic System in this work
Disassemble the components and clean system to remove contamination from hydrostatic system. See Cleaning
Hydrostatic System in this work package.
Contamination in the hydraulic system or hydrostatic system is a major cause of malfunction of components. Con-
tamination is any foreign material in the hydraulic oil. Contamination can enter the hydraulic and hydrostatic sys-
tem in a variety of ways.
Draining hydraulic oil or disconnecting a line.
Disassembling hydraulic or hydrostatic components.
From normal wear of components.
From damaged components.
Types of Contamination
There are two types of contamination, microscopic and visible. Microscopic contamination occurs when very fine
particles of foreign material are in suspension in hydraulic oil. These particles are too small to see or feel. Micro-
scopic contamination can be found by identification of the problems that microscopic contamination causes, or by
testing in a laboratory. Examples of problems caused by microscopic contamination include:
Cylinder rod seals leak.
Control valve spools do not return to neutral.
Hydraulic system has a high operating temperature.
Components wear rapidly.
Visible contamination is foreign material that can be found by sight, touch, or odor. Visible contamination can
cause a sudden failure of a component. Examples of visible contamination include:
Particles of metal or dirt in oil.
Air in oil.
Odor of burned oil.
Water in oil.