How to Repair Threaded Head Hydraulic Cylinders

In another blog, we introduced how to repair a wire ring hydraulic cylinder. This blog introduces a set screw and a locking ring hydraulic cylinder.

Repairing A Set Screw Style/Locking Ring Hydraulic Cylinder

      
Disassemble :

• Begin disassembling threaded head cylinders by loosening the set screw and end cap, then remove the piston, rod, and gland assemblies.
   
• Detach the piston from the rod by undoing the lock nut.
   
• Remove the end cap and gland assembly, then take out the seals and check all components, including the polished cylinder tube, rod, and piston.

Re-assemble:

Once new seals are in place, reinsert the rod through the gland assembly and end cap.

• Attach the piston back to the rod with the lock nut. Lubricate the seals and tube interior with hydraulic oil before installing the piston, gland, end cap, and rod.
   
• Securely hold the cylinder body in a vise and use a gentle rocking motion for component insertion.
   
• Apply anti-seize to the threads before installing the cylinder end-cap, then tighten the cylinder and set screw to the recommended torque levels.   
            
                         

Three things to inspect during disassembly

It's crucial to thoroughly examine the rod for bends or scratches. A bent rod should be straightened or replaced, while scratches might indicate the need for a new tube if the piston seal is damaged or missing.

Inspect the rod seal for any distortion, which often points to a bent rod or a worn guide bushing. If the tube's interior is scratched, scored, or pitted, it requires honing, or replacement if the damage is severe.

Leaks not caused by visible issues with the shaft or cylinder might indicate damaged seals. Remember, surface scratches and gouges where the seal is fitted can also cause leaks. Handle seals with care during installation.

Repairing the hydraulic cylinder for its life is extremely important, so when the cylinder's use time is too long, inspect it immediately.

If you have any complex or technical inquiries regarding hydraulic cylinders, AiSoar's team of experts is ready to provide detailed answers. From nuanced aspects of design and operation to specialized maintenance and troubleshooting techniques, they're equipped to address advanced queries with precision and expertise.