Attention! Washing time of sealing rings in isopropyl alcohol is not more than 20 s, followed by blowing with compressed air.
The cylinder bore and the working surface of the pistons must be completely clean without rust, scratches or other defects. An increased clearance between the cylinder and the pistons is unacceptable.
Replace the seals with new ones each time the cylinder is disassembled, even if they appear to be in good condition.
Check the elasticity of the piston spring, the length of which should be: under load 35+7 N (3.5+0.7 kgf) - 36 mm, under load 63.5 + 10 N (6.35+1.0 kgf) - 21 mm, in the free state - 57.5 mm.