TECHNICAL INFORMATION BULLETIN No. 040896
Alamo Industrial ™ Technical Services Department
1502 East Walnut
Seguin, Texas 78155
Models: All Models using Single Acting Hydraulic Cylinder
Bulletin No:
040896
Date:
Apr. 8, 1996
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.
This document does not authorize the repair or replacement of parts under warranty
MACHETE
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