Edition 2 Chapter 1 Page 1-45
Feb/2013 Maintenance and Service
I. Replace the Return-Line Filter Element
The hydraulic tank (reservoir) has a return-line filter on the input connection
(return-line). The filter stops contamination of the hydraulic fluid, such as
particles of metal and rubber. Make sure that you are careful when you add
fluid to the system.
The filter element in the filter stops the particles that are more than 1 um in
dimension. It can decrease the number of magnetized and non-magnetized
particles. The filter increases the quality of the hydraulic fluid which increases
the service life of all the components in the system.
The texture of the filter is a non-woven chemical fabric which can stop the flow
of contamination and let a large quantity of fluid go through. The usual system
pressure does not decrease. Its filter precision is calibrated by the absolute
filter precision. Its filter ratio and efficiency align with the requirements of ISO.
To replace the filter, the top cover is the only part you must remove.
When the system is open (top cover off), the contamination that is caught by
the filter cannot go into the system because of the internal fluid openings.
Figure 1-38 Filter Change Interval
Do not replace the filter element if the hydraulic system is pressurized.
J. Filter Replacement
(1) Remove the four bolts and top cover.
Figure 1-39 Top Cover
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