How To Repair A Hydrolic Cylin

Hydraulic cylinders are critical to your productivity, and when one fails you lot demand it repaired quickly and accurately. The repair process for a hydraulic cylinder may seem rather straightforward, just in that location are certain of import aspects that must be kept in mind for the repair to be done correctly the first time.

Preparing to Repair a Hydraulic Cylinder

The first step in preparing to disassemble a hydraulic cylinder is to clean off the unit to prevent the unnecessary incursion of dust, oil, grease, and similar debris into the cylinder unit. Also go along in mind that repairs need to be performed in a clean space if at all possible; while there are times when emergency repairs may demand to be performed in the field, it is always preferable to take intendance of maintenance and repair in an area as costless of dust and wet equally possible.

Once the unit of measurement is clean, the hoses tin be disconnected and both the ports and hoses should be plugged securely. From that point, you can open up the cylinder ports and let the hydraulic fluid to drain.

Hydraulic Cylinder Repair

There are dissimilar types of cylinders, and the repair process depends on which type is involved. The most common types of cylinders are either wire ring or threaded head (and in the instance of a threaded head cylinder, at that place will be either a set screw or a locking ring). Note that, during the repair procedure, all components should be cleaned in a petroleum-based solvent, blown dry via compressed air and, earlier they are installed, coated with hydraulic fluid.

Disassembling a Wire Ring Cylinder

For a wire ring cylinder, the rod assembly should exist retracted and the external steel wire ring removed. A mallet and punch can then exist used to button the head into the cylinder tube until the internal groove is exposed and the internal wire ring is moved into a position to exist removed.

The seal replacement kit for the cylinder includes a plastic removal ring, which should be straightened and then inserted in the internal groove with the feathered end pointing into the tube itself. If the ring is not entirely within the groove before the rod is pulled out, it may get stuck and become trapped between the tube and the caput (which is certainly something to exist avoided). If the ring is not in the groove, it may be necessary to remove it and endeavor again.

This step is followed by extending the rod in order to pull the head out of the tube, so completely removing the rod. If yous endeavor to forcefulness the rod out when resistance is met, the ring could jam and the cylinder may exist damaged. Once the rod has been removed, the removal ring should also be removed and at present yous tin remove the locknut, piston, and head/gland. From there y'all can access the seals, which should all be inspected and replaced.

Note that information technology is extremely of import that the interior surface of the cylinder tube be closely inspected forth with the piston and rod. These and other polished parts need to be visually checked for the presence of burrs, scratches, or scuffs.

Repairing a Wire Ring Cylinder

Side by side the piston and locknut should be replaced. Torque the locknut to the advisable value based on its size. The band should be installed and then it compresses the inner wire ring on the head assembly — it is extremely of import to ensure that the band clamp cam is not over the top of the ring gap. Once the ring clamp is in place, it should be tightened to ensure the wire ring is seated fully. To allow it to slide during the final associates stage, loosen it most ½ plow.

Annotation that during the reassembly process related to the head/gland you should get out the outer o-ring dual seal loose on the rod for it to be installed at a later step. The cylinder tube and piston seals should at present be lubricated using hydraulic oil and the piston inserted into the tube. The cylinder head should exist tapped in the tube until the ring clamp slides over and the wire band is located inside the tube. Loosen and remove the clench.

At present the o-ring dual seal can be installed. In one case that is complete, you should tap the caput until the end of it is flush with the tube. This step is extremely important: this allows the inner wire ring to snap into position inside the internal cylinder groove. If this is not accomplished, then every bit soon every bit force per unit area is practical to the cylinder, the caput and rod assembly will come out of the tube. Finally, you should pull the rod out then the external wire ring groove (in the cylinder head) is exposed so the ring can exist installed.

Repairing Typical Threaded Caput Cylinder (Set Screw)

For threaded head cylinders, disassembly begins with loosening the gear up screw and the end cap. From there, the piston, rod, and gland assemblies can be removed. You can remove the piston from the rod assembly by loosening the lock nut. Next, slide off the end cap and gland associates. Once that is consummate, remove the seals and inspect the parts, including polished parts such every bit the cylinder tube, rod, and piston.

After the seals have been replaced, reinstall the rod through the gland assembly and finish cap, then secure the piston to the rod using the lock nut. After lubing the seals and within of the tube with hydraulic oil, the piston, gland, end cap, and rod tin exist installed. You should make certain the cylinder trunk is gently secured in a vise and employ a slight rocking motion to get the components inserted. Before installing the cylinder end-cap, use Loctite anti-seize on the threads, then tighten the cylinder, and set screw to recommended torques.

Common Aspects of Hydraulic Cylinder Repair

The details for repairing threaded head cylinders differ in certain respects from the process for a wire ring cylinder. There are, however, certain things that both procedures take in mutual. For example, if y'all find it difficult to push the cylinder dorsum in due to pressure, information technology is highly probable that the input valves need to be slightly loosened. As well, polished surfaces do need to be inspected carefully, seals should always exist replaced once they have been removed, and specific torque values need to be used when tightening critical components. Finally, incorrectly reassembling the hydraulic cylinder or failure to correctly install seals tin result in serious, expensive harm.

Key Things to Wait For During Disassembly

Remember that the rod should e'er exist carefully inspected to make up one's mind if it is bent or if the surface is scratched. If the rod is bent, it either needs to be straightened or a new 1 needs to exist fabricated. If the piston seal is eroded, misshapen, or missing, and so at that place is an issue with the tube that probable requires replacement.

The rod seal should likewise be checked for baloney, which normally is a sign of a bent rod or a worn-out guide bushing. If the inside of the tube is scratched, scored, or pitted, it will need to exist honed or, if the damage is too deep into the surface, replaced.

If a leak is present and there seem to be no problems with the shaft or cylinder fore, then the upshot is likely a damaged seal. Even so, keep in heed that scratches and gouges on the surface where the seal is installed against or upon which it rests tin lead to leaks as well. And when seals are installed, they must be handled carefully.

Going Beyond Cylinder Repair

When inspecting the components for damage, information technology is important not merely to address the impairment (i.e., polishing or resurfacing) or replace the parts involved but troubleshoot why the damage occurred in the first identify. If a repair is fabricated without tracking down what caused the problem in the first place, given plenty time the repair will only take to be repeated. An experienced technician tin recognize the signs of common bug and run into to it that the source of the trouble is addressed in addition to the necessary repairs being performed.

Decision

The hydraulic cylinder repair process involves attention to item and careful visual inspection — both of which oftentimes require several years of experience to principal. The bulk of repairs, such as honing tubes and fabricating rods, are best performed by professionals. In addition, professionals take the skill to troubleshoot the root cause of the harm and so that it can exist addressed.

MAC Hydraulics

At MAC Hydraulics, hydraulic cylinder repair is one of the many services that we offer. We tin install new seals, hone tubes, polish rods, and manufacture replacement components for your hydraulic cylinders, regardless of the brand. Our state-of-the-art facilities back up tube, rod, and cylinder fabrication every bit well as machining and welding. In addition, we offering 24-hour cylinder resealing along with a choice-up/delivery service. If you take hydraulic cylinders in need of repair, contact MAC Hydraulics today for quick, efficient, high-quality service.