Hydraulic repairs are done based on our experience, using spare parts manufactured to highest market standards. Karas-Seal Services also supplies all the necessary hydraulic parts for the repairs. Various hydro cylinders are manufactured in our workshop according to your specifications.
How we repair the cylinders
- Disassembly and Inspection
- Remove the seals (after disassembly the old seals can not be used again)
- Rod inspection.
The rod should be checked for cracks using dye penetrant at all points where its cross-section changes as well as chrome surface of the rod. If the chrome looks dull on one side and polished on the opposite side, the rod is bent. In case it is possible bent rods is straightened in a press, otherwise it will be replaced.
Our speciallists will machine a new rod from hard-chrome plated round bar.
- Head inspection
The inside diameter of the head should not exceed the nominal rod diameter plus 0.004 inch. If the head measures outside this tolerance, it will result in premature failure of the seal. Therefore, the head must be sleeved using a bronze bush or be replaced with a new head, machined from a similar material.
- Barrel inspection
The barrel is checked for internal pitting or scoring. If the barrel is pitted or scored, the effectiveness and service of the cylinder will be reduced. So the barrel must be honed to remove damage or be replaced.
- Piston inspection
Minor scoring on the outside diameter of the piston is not detrimental to the function of the cylinder, as long as the minimum diameter of the piston is not less than the nominal bore diameter minus 0.006 inch. In this case or if it is pitted or scored it must be replaced with a new piston machined from a similar material.
- Repacking the seals
New seals are installed. Our speciallists will machine new seals and installe them.
Karas seal do not only repair hydraulic cylinders, but also sells spair parts and equipment. We can provide rods, pistons, heads etc machined occording to your needs, as well as gaskets and seals or materals for the seal production.