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© 2005 Alamo Group Inc.
1-5
HYDRO 15 (HY15)
TECHNICAL INFORMATION BULLETIN No. 040896
Alamo Industrial ™ Technical Services Department
1502 East Walnut
Seguin, Texas 78155
830-372-2708
Models: All Models using Single Acting Hydraulic Cylinder
Date:
Apr. 8, 1996
Bulletin No:
040896
This document does not authorize the repair or replacement of parts under warranty
Oil Leaking from new single Acting Hydraulic Cylinders:
There have been numerous cases of the dealers and customers replacing single acting
hydraulic cylinders on new machines due to oil leakage out of the vent plug in the cylinder.
In many of these instances, no defect could be found in the cylinders. Further investigation
has revealed that he manufacture of our cylinders is leaving oil in the cylinders after their testing. The
Oil is left to help protect the interior of the cylinders during storage. When the cylinders are fully
actuated, they are forcing this oil out the vent plug, causing what appears to be a leaking cylinder
through the vent plug. Even the oil is cleaned off the cylinder after testing there is enough oil still inside
the cylinder to bleed out when used.
If you have a New Cylinder that appears to be leaking from the vent plug, The oil should be
cleaned off and unit ran for a few days to a week to determine if the Cylinder is leaking, or if it is the
oil that was left in the cylinder to protect it. It has been found that in some cases it has taken as much
as a week for this to appear that it is not leaking.
If after running and cycling the cylinder during operation and the cylinder continues to leak then
the necessary repair should be performed.
Cylinders that are attracting dust around them is not considered to be leaking. This dust
collecting around them is considered normal.
All Cylinder that are returned as leaking will be pressure tested for leakage to determine the
condition of the Cylinder and its components.