INTRODUCTION
Hydraulic contamination
Contamination in the hydraulic system is a major cause of the malfunction of hydraulic components. Contamination
is any foreign material in the hydraulic oil.
Contamination can enter the hydraulic system in several ways:
• When you drain the oil or disconnect any line
• When you disassemble a component
• From normal wear of the hydraulic components
• From damaged seals or worn seals
• From a damaged component in the hydraulic system
All hydraulic systems operate with some contamination. The design of the components in this hydraulic system per-
mits efficient operation with a small amount of contamination. An increase in this amount of contamination can cause
problems in the hydraulic system.
The following list includes some of these problems:
• Cylinder rod seals that leak
• Control valve spools that do not return to neutral
• Movement of control valve spools is difficult
• Hydraulic oil that becomes too hot
• Pump gears, housing, and other parts that wear rapidly
• Relief valves or check valves held open by dirt
• Quick failure of components that have been repaired
• Slow cycle times are slow. The machine does not have enough power.
If your machine has any of these problems, check the hydraulic oil for contamination.
There are two types of contamination: microscopic and visible.
Microscopic contamination occurs when very fine particles of foreign material are suspended in the hydraulic oil.
These particles are too small to see or feel. Microscopic contamination can be found by identification of the following
problems or by testing in a laboratory.
Examples of problems caused by microscopic contamination:
• Cylinder rod seals that leak
• Control valve spools that do not return to neutral
• The hydraulic system has a high operating temperature
Visible contamination is foreign material that can be found by sight, touch, or odor. Visible contamination can cause
a sudden failure of components.
Examples of problems caused by visible contamination:
• Particles of metal or dirt in the oil
• Air in the oil
• Dark or thick oil
• Oil with an odor of burned oil
• Water in the oil
If you find contamination, use a portable filter to clean the hydraulic system.
47937811 29/02/2016
22
Summary of Contents for CX160D
Page 7: ...47937811 29 02 2016 Find manuals at https best manuals com...
Page 8: ...INTRODUCTION 47937811 29 02 2016 1 Find manuals at https best manuals com...
Page 17: ...INTRODUCTION Cab CX130D CX160D CX180D SMPH15CEX5805FA 2 47937811 29 02 2016 10...
Page 18: ...INTRODUCTION Cab CX210D CX230D CX250D CX300D SMIL14CEX2002FA 3 47937811 29 02 2016 11...
Page 24: ...INTRODUCTION 8023766E 1 47937811 29 02 2016 17...
Page 25: ...INTRODUCTION 97815A48 2 47937811 29 02 2016 18...
Page 26: ...INTRODUCTION E9BCB5F5 3 47937811 29 02 2016 19...
Page 81: ...This as a preview PDF file from best manuals com Download full PDF manual at best manuals com...
