box of mixed Hydraulic cylinder seals reseal resealing for heavy equipment earthmoving mining quarries.

The 5 Hydraulic Cylinder Resealing Must-Knows

Your hydraulic cylinder resealing process has already begun. You’ve disassembled it and you have a bag (or box) of brand-new seals. Now you want to get the new seals in and the hydraulic cylinder assembled and back on the machine.

But you want to do it right the first time. And this is good. Because the last thing you need is to do all this work and the hydraulic cylinder starts leaking again. 

Because there are a few points that you should know when doing a reseal. Well, there are five points that are important to know. By considering these, you can further improve the reliability and restore performance of your hydraulic cylinder after resealing. 

Also, we’ll assume the seals you’re supplied with are suitable for the machine and its hydraulic fluid.

#1 Inspect

Start by inspecting the hydraulic cylinder itself. Look at the condition of the bore and rod for wear, scoring, or damage. Repair or replace any damaged parts. 

Installing new seals won’t make up for damaged parts. 

#2 Quality

You’re going to inspect the seals and make sure what’s supplied are the correct seals. On top of this, check the condition of each item.

Seals may appear new at a glance. Look closer… Are they at a standard or condition to what you’re satisfied with?  If not, get it replaced. 

#3 Technique

An insider secret to installation technique is to avoid forcing the seals and causing them to kink into sharp bends. If you’re finding it difficult to install a seal in an internal groove then use dedicated seal installation tooling to assist.

For external seals, such as those for the piston, only expand the seal enough to slip over the component body. Over-stretching can permanently damage the seal and reduce its life.

#4 O-Ring

After you’ve installed an O-ring, check that it’s not sitting twisted. Having a twisted hydraulic O-ring compromises the sealing performance and life.

Majority of times O-rings are installed manually, so use tools without sharp edges.

#5 Lubricant

There’s a huge range of lubricants and greases, but not all are compatible with your seals.

Lubes that have solid additives, such as molybdenum disulphide should be avoided. It may be suitable for pins and bushes, rod ends, and CV joints, but not for hydraulic cylinder seals.

A compatible and readily available medium for lube is the machine’s hydraulic oil. You can use hydraulic oil to lube the seal that need to be stretched slightly as it is being located into the groove, such as a piston seal.

Lubricate the barrel bore with a film of hydraulic oil before assembly.

How To Get Hydraulic Cylinder Help

Resealing a hydraulic cylinder can end up a time-consuming task that requires expertise and special processes, especially within the demanding environment of the mining, and earthmoving industry. 

While understanding the key steps can help, handling this work in-house may not be the most efficient use of your resources.

By entrusting this job to our expert team, you can save valuable time and money, gain peace of mind, and benefit from our professional warranty.

We specialise in servicing hydraulic cylinders for the mining, earthmoving, and heavy equipment industries, ensuring your equipment operates at peak performance with minimal downtime.

Contact us today to have your hydraulic cylinders serviced by our expert team, allowing you to focus on maximising productivity and efficiency in your operations.

Contact us on 07 3800 8721 and a friendly team member will help you get the best solution for you.

Written by The A1HE Team

Date: 05.07.2024