Case CX330 Excavator Service Manual

Table of Contents

1. General
2. Engines
3. Fuel System
4. Electrical
5. Undercarriage
6. Drive Train
7. Hydraulics
8. Upper structure

Manual Extract

CLEANING THE HYDRAULIC SYSTEM

General remarks
Contamination of the hydraulic system is a major cause of incorrect operation of hydraulic components.
The contamination results from the presence of foreign bodies in the hydraulic fluid. Contamination of the hydraulic system can occur in any of the following situations:
1. When draining the fluid or reconnecting the hydraulic lines.
2. When removing a component.
3. Due to normal component wear.
4. Due to damaged or worn seals.
5. Due to a damaged component in the hydraulic system.

All hydraulic systems can function even if they are slightly contaminated. The components of the hydraulic system are designed to support slight contamination.

Any increase in the degree of contamination can cause serious problems in the hydraulic system.
Here is a non-exhaustive list of these problems:

1. The cylinder rod seals are leaking.
2. Control valve spools do not return to the neutral position.
3. The control valve spools do not move easily.
4. Hydraulic fluid is too hot.
5. Hydraulic components wear quickly.
6. Safety valves or non-return check valves do not close due to contamination.
7. Repaired components break down soon.
8. Cycles are slow; the machine does not have enough power.

If one of the above situation occurs, it shows excessive contamination of the hydraulic system. To eliminate this contamination effectively, use the portable filter CAS 10162A.