Seal kits and repair kits
Complete seal kits for hydraulic cylinders, pumps and hydraulic motors: all the elements that need replacing in an overhaul, in a single package.
Finding seals one by one during an overhaul takes time; a complete kit ensures that all elements are replaced at the same time and in the right size. We supply ready-made repair kits from stock, and for cylinders without a kit we take dimensions from the old seals and build the kit from individual profiles.
Types
Cylinder seal kits
A complete set containing the rod seal, piston seal, wiper, guide rings and O-rings; ready-made kits for construction machinery cylinders.
Pump seal kits
The shaft seal, body gasket and O-rings of gear pumps.
Hydraulic motor seal kits
The shaft seal and body sealing elements of orbital hydraulic motors.
Pneumatic cylinder kits
Seal sets for standard pneumatic cylinders.
How to select
When one of the seals in a cylinder starts to leak, the others are the same age and will leak soon afterwards. That is why replacing the whole kit during an overhaul, not only the leaking seal, means spending the labor and the downtime only once.
To select a kit, the brand and model of the cylinder or pump is enough, or failing that the rod and bore diameters. For cylinders without a ready-made kit we measure the old seals, identify the rod, piston, wiper and guide elements one by one and build the kit.
In our workshop, during cylinder and pump overhaul we replace the kit, measure the rod and the tube, and test the unit before delivery.
Elements usually found in the kits
| Kit | Rod side | Piston side | Other |
|---|---|---|---|
| Hydraulic cylinder | Rod seal, wiper, rod guide ring | Piston seal, piston guide ring | O-rings and back-up rings |
| Gear pump | Shaft seal | - | Body gasket, O-rings |
| Orbital hydraulic motor | Shaft seal | - | Body sealing elements, O-rings |
| Pneumatic cylinder | Rod and wiper seal | Piston seal | Cushioning seals, O-rings |
The contents vary by brand and model; we identify the kit from the model of the cylinder or pump, or from the old seals.
Frequently asked questions
What is in a hydraulic cylinder seal kit?
Cylinder kits usually contain the rod seal, piston seal, wiper, guide rings and O-rings; pump kits contain the shaft seal and body gaskets.
Can I replace only the leaking seal?
Because the other seals are the same age, they may leak soon afterwards. Replacing the whole kit during an overhaul means doing the job once.
What should I do if there is no ready-made kit for my cylinder?
Sending the old seals or the cylinder dimensions is enough; we identify the elements one by one and prepare the kit.
What else should be checked when replacing a seal kit?
Scratches and flaked chrome on the rod, damage to the inner surface of the tube, and wear on the guide rings. A new kit fitted without correcting these will also leak in a short time; during an overhaul we check them by measurement.
Are there seal kits for construction machinery cylinders?
Ready-made kits are available for most construction machinery cylinders. Stating the brand and model of the machine and the position of the cylinder is enough.
Can I fit the seal kit myself?
An experienced fitter can install a kit with the correct dimensions; but it is important that the seal seats in the groove without damage and that the rod is checked. In our workshop we replace the kit and test the cylinder.
Should I buy a seal kit or individual seals?
If the model of the cylinder or pump is known, a kit is the safer choice: all elements arrive complete, in the right profile and size. If the model is unknown, or the machine has previously been repaired with different parts, the removed elements are measured and the seals are selected one by one.
Why is my cylinder still leaking after a new seal kit?
There are two most common causes: the seal was cut while being passed over a thread or a sharp edge during installation, or the rod is scratched or its chrome plating has flaked. Seals should be lubricated and fitted with an installation sleeve, and the rod and tube should be checked before the kit is fitted.
Can the material of the seals in a kit be changed?
Standard kits are made for mineral oil and normal temperature. If the system runs continuously at high temperature or a water-based fluid is used, the elements are selected one by one in a suitable material.
Stock, sizes and part numbers
Sizes in stock, manufacturer part numbers and brands are kept up to date in our catalog. Send us your requirement on WhatsApp or by e-mail and we will quote and ship worldwide.
Seal kits and repair kits in the catalog Online store (Turkish) →