Coastal Hydraulics is an industry leader in resealing cylinders. We reseal metric and standard hydraulic cylinders. No job is too large or too small. With our skilled personnel and attention to detail, we can repack your cylinders with the right seals for your application.
Typically, a cylinder will be removed for repair due to either external or internal leakage. Close inspection of the cylinder parts, particularly the seals, after disassembly can reveal problems that may not otherwise be obvious.
If the piston seal is badly distorted, eroded or missing, the barrel is oversized or has bulged in service. In this case, the barrel or the complete cylinder should be replaced. Replacing the piston seal without replacing the barrel should be considered a short-term fix and will require comprehensive maintenance at the earliest opportunity.
If the rod seal is badly distorted, usually the guide bush is excessively worn or the rod is bent. Both cases result in the weight of the rod riding on the seal which causes failure. Replacing the rod seal without identifying and rectifying the cause of the problem is a short-term fix.
Check the rod for cracks using dye penetrant at all points where its cross-section changes. Inspect the chrome surface of the rod. If the chrome looks dull on one side and polished on the opposite side, the rod is bent. Rod straightness should be checked when a cylinder is being repaired. This is done by placing the rod on rollers and measuring the run-out with a dial gauge.