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the top 10 reasons for hydraulic cylinder failures - and what to do about them

by:DMS Seals     2019-11-09
From bad specifications and misuse to normal old age, the hydraulic cylinder will fail for various reasons.
The following are the ten fault causes and treatment methods for hydraulic cylinder maintenance. 1 -
Regular sealing leaks this can be caused by multiple reasons, the most common of which is that the seals on the new cylinder are not properly installed, but incorrect metal processing gaps can also cause early failure.
Once the device is in use, another physical cause of this failure is the mark of the corrosion or sealing slot.
The oil itself may also be the cause because it is contaminated or because the air is trapped.
There is no doubt that corrective measures include inspection and replacement of seals if necessary.
In any case, the metal processing clearance should be checked, and the oil should be replaced if it is found to be contaminated.
There needs to be a clear reason for the oil contamination as this may be a sign of less obvious wear --
Checking gaps is part of this process. 2 -
Often, piston wear is caused by oil pollution, but this may also be pollution of capping bearings.
If it is not caught in time, the capping bearing may have completely failed.
Capping bearings need to be checked and replaced if necessary.
The whole hydraulic system needs to be flushed before re-cleaning, all filters need to be replacedAssembly and reassemblypressurising. 3 -
The cylinder hole wear of the cylinder hole may also be caused by oil pollution, which in turn may be a sign of the fault of the piston head bearing.
If necessary, the piston head bearing needs to be checked and replaced.
Due to any one fault, the entire hydraulic system needs to be flushed before reinstalling, all filters need to be replacedAssembly and reassemblypressurising. 4 -
The most likely cause of corrosion inside the barrel is the water in the oil.
Disassembly and re-correction may be required
Coating but oil needs to be replaced at least.
The cylinder needs protection against future water intake, which may also be a sign that it is either incorrectly specified or used in an environment where it is not designed. 5 -
To a large extent, the only reason for the piston hole is corrosion.
This may also be a sign that the cylinder is incorrectly specified or used in an environment that is not designed.
From the beginning of the rod, even the entire cylinder should be protected from the weather or any other reason for contact with the water.
Ideally, the bar should also be upgraded to the Marine specification. 6 -
Leakage from the outer diameter of the gland may be due to o-
Ring failure, or due to the rupture of the gland, this may be caused by poor clearance.
Clearance needs to be checked and the gland is tested for cracks. If the o-
There is a fault in the ring, usually a backup can be installed, or o-
Rings can be replaced. 7 -
The curved piston rodA bent piston rod may be a sign of the overload of the hydraulic cylinder.
This may be because the cylinder and the associated piston work outside of its specifications --
In other words, overload.
It may also be caused by the outside (sideways)
Some kind of influence-
Collision, for example.
The first thing to check is the load and whether the cylinder is working within the specification range, because without this information, any repairs will not last for a long time.
The piston rod can be replaced, but this is also an opportunity to review the specification and upgrade the rod if needed. 8 -
Split welding on the base and portsA split welding on the base and port may be caused in the original manufacturing (
Or recent repairs)
Failed due to poor welding.
It may also be caused by impact load.
Or suddenly hit to full pressure (or beyond).
The use of the cylinder needs to be checked to ensure that the cylinder has not been misused and has not been used beyond its specifications.
This will ensure that the problem does not appear again after the fix.
Repair will involve processing and re-processing from welding
Welding is correct. 9 -
Eye bearing broken eye bearing is usually caused by a cylinder working under a load above its specification, or by an impact load-
Or suddenly hit to full pressure (or beyond).
As with the other problems above, the use of the cylinder should be checked before the repair is carried out to ensure that it does not meet the specifications.
This survey may lead to changes in use or to upgrades to maintenance specifications.
For example, you can upgrade the specifications of the replacement of the eye bearing, or you can increase the size of the splint pin. 10 -
The worn Rod on one side is a sign of some kind of lateral movement, or due to the lack of bearing support (
May be caused by bearing failure)
, Or too much side load due to misplacement or misuse.
The rod itself may actually be under a specified load, so the use of the cylinder should be checked to ensure that it is used within the specification.
Repair will provide an opportunity to not only solve the problem, but also to improve the specification of the Assembly by increasing the size of the rod, increasing the bearing area or installing the external guide rail.
The combination of the three is also possible.
Of course, the list above is not exhaustive, but these are the most common failures.
Often, hydraulic cylinder repair is an opportunity to review work practices or improve cylinder specifications.
This means that not only the problem has been solved, but preventive measures have been taken to reduce the likelihood of future recurrence.
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