PREVENTATIVE MAINTENANCE | 33
HYDRAULIC SYSTEM SERVICE
Replacement of Filter
1) Unscrew the lter housing from the lter assembly, allow oil to drain from the lter and
discard properly.
2) Coat the rubber gasket with fresh hydraulic uid.
3) Screw the lter on to the housing (hand tighten only).
4) Check the uid level and replenish with fresh uid.
5) Operate the hydraulic system and check for leaks.
Contamination
It is estimated that as much as 90% of all hydraulic problems can be traced directly to the uid. It is
imperative that all foreign matter be kept from the hydraulic uid. Quantities of invisible abrasive
contamination will cause serious pump wear, malfunctioning of pumps and valves, and sludge
accumulations within the system in relatively short periods of time. It is also essential that moisture
and water be kept from the hydraulic system.
Commercial Hydraulic Fluid Testing
Hydraulic uid samples should be taken periodically for laboratory analysis. The actual sampling
method is critical. It should be done on ANSI Standard 893.19M (R1980). This standard is available
from the National Fluid Power Association, 3333 N. Mayfair Road, Milwaukee, WI 53222.
Two identical hydraulic uid samples should be taken from the center of the reservoir when the
uid is at operating temperature. One will be sent laboratory analysis and one will be kept for your
own preliminary analysis. Each of the samples is to be placed in a clean, dry glass bottle with a non-
shedding screw-on cap. The bottles should be labeled with the date, type of uid, and model and
serial number of the machine.
We recommend the use of commercial laboratory services for analysis of routine uid samples taken
on a regularly scheduled basis. The cost is about $20 to $30 per sample. The most important analyses
are particle count, Spectro-chemical analysis, water content, and viscosity.
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