1. Keep your hydraulic oil clean
Many hydraulic failures occur because of hydraulic oil contamination. If hydraulic oil is contaminated, it must be thoroughly cleaned as soon as any contamination has been found. It is also best to fit high-efficiency filters and change them when necessary.
If a filter has a build-up of debris, a differential pressure gauge can be installed to give you a good indication as to when they need to be changed. This means that you will be preventing a bypass, where the oil flows through the system unfiltered.
2. Undertake regular cylinder maintenance
Regular hydraulic cylinder maintenance is important for optimal performance. Make sure you keep a close eye on the condition of the cylinder rod for any signs of corrosion, pitting or wear. Too much moisture can cause corrosion, whether this is from the air or from within the hydraulic fluid itself. If water contamination occurs within the fluid, it can cause major failure of the component or system. The oil therefore needs to be thoroughly cleaned as soon as possible. Moreover, corrosion encourages wearing of the seals, due to increased friction. Pitting causes a similar problem.
Misalignment is often the main cause of uneven wear within a cylinder. Premature wearing of the bearing seals and rod can be caused by side loads, allowing the rod to rub on one side of the bearing. The best course of action for this type of rod damage, is more often than not, a re-chrome or polish. If a cylinder rod is beyond repair, a replacement is the best course of action. However, before you re-install the new rod, it is important to first remove the problem that originally caused the damage. And subsequently making the new cylinder more cost-effective.
3. Maintain the accessories of your cylinder
Each separate part that makes up your hydraulic cylinder is just as important as the cylinder itself. For example, if a pivot pin or clevis is worn or damaged, this could cause slop and play within the joints of the cylinder. This leads to misalignment and wear or more permanent damage.
4. Rotate or alternate cylinders
If the risk of downtime is not an option, it is always a good idea to hold ‘critical spare’ cylinder parts (see below) or alternate the usage between different cylinders. This break between uses keeps the cylinders in good shape, despite possible particle contamination and harsh operating conditions. It is also wise to undertake maintenance on these cylinders when they are removed from the system, so that they can be repaired if necessary.
Before re-assembling a cylinder, you may want to first replace all of the seals. Inspection of the cylinders may also give you an idea as to the condition of the entire system. For example, if there is a consistent varnish throughout your system, it could mean that the oil temperature is too high and it needs to be altered.