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Pellerin Milnor Corporation
3.4.2 How to Make Sure That the Hydraulic Oil is Serviceable
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Two types of deterioration can occur with the hydraulic oil: contamination and chemical change.
You can usually remove contamination with special filters. To prevent damage to components
(example: rust), it is necessary to replace the oil if a chemical change occurs.
Visually examine the oil through the view port. Put approximately one pint (one half kilogram) of
oil from the drain pipe on the tank in a cup. When the oil is new, it is transparent, has an amber
color and has no contamination. When the machine operates correctly, the oil can get a brown
color. This condition is satisfactory. Speak to your local hydraulic maintenance company if one
or more of these oil conditions occur:
• not transparent
• a brown to black color
• a gray to white color
• particles or bubbles
• a sour or burned odor
Give the hydraulic company a sample of the oil to examine. They can identify the type of deterio-
ration and tell you the correct procedure. If it is possible to use special filters to remove the con-
tamination, they can supply the necessary equipment.
3.4.3 How to Examine the Hydraulic System for Leaks
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WARNING: Contact with a hydraulic oil leak — can inject hydraulic oil in your body,
and kill you.
� Do not use your fingers to examine components for hydraulic leaks.
A leak in the hydraulic system can be an oil leak or an air leak. If oil comes out with pressure,
you will usually see an oil stain or an area where oil collects on a machine surface. The usual
symptoms of an air leak are:
• The oil in the tank will have air bubbles.
• The machine will make the sound of ball bearings in a pipe when the hydraulic system
operates.
It is necessary to repair a hydraulic leak. Speak to your dealer or Milnor
®
. This is not routine
maintenance.
Routine Maintenance
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