In your last hydraulic maintenance email,
we discussed the cylinder life extension
benefits presented by alternative rod surface
treatments.
Today I want to talk about a major cause of
hydraulic cylinder failure and how to prevent it.
Bent rods are a common cause of rod seal failure
and therefore, cylinder failure. Bending of cylinder
rods can be caused by:
- Insufficient rod diameter
- Insufficient strength of the rod material
- Improper cylinder mounting arrangement
- Or a combination of all three
Once the rod bends, excessive load is placed on
the rod seal resulting in premature failure
of the seal.
If a rod is bent, then it's wise to check actual
rod loading against permissible rod loading based
on the cylinder's mounting arrangement, the diameter
of the rod and the tensile strength of the rod material.
The procedure for doing this is explained in detail
on pages 58 and 59 of 'Industrial Hydraulic Control'.
http://www.industrialhydrauliccontrol.com/
If actual road load exceeds permissible load then a
new rod should be manufactured from higher tensile material
and/or the rod diameter increased to prevent the rod from
bending in service.
In your next hydraulic maintenance email in a few days time,
I'll reveal three more causes of hydraulic cylinder failure.
Yours for better hydraulics knowledge,
Brendan Casey
Author of 'Insider Secrets to Hydraulics'; and
'Preventing Hydraulic Failures'.
http://www.hydraulicsupermarket.com/books.html
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