HyPrecision 50S/60S/75S Operator Manual 808690 133
5 – Preventive maintenance
Preventive maintenance
4. Use the wooden dowel from the bleed-down valve repair kit to push the hydraulic piston out of the actuator
housing.
5. Remove the piston O-ring and the piston O-ring backup from the hydraulic piston.
6. Clean the hydraulic piston with a lint-free towel and isopropyl alcohol. Examine the hydraulic piston for
deterioration, corrosion, or damage. Replace it if necessary.
7. Put O-ring lubricant on the new piston O-ring backup. Roll the backup into the short end of the hydraulic
piston. The piston O-ring backup has a flat side and a concave side. Make sure the flat side of the piston
O-ring backup faces the short end of the hydraulic piston.
8. Put O-ring lubricant on the piston O-ring and roll it over the long end of the hydraulic piston. The piston
O-ring fits into the concave groove on the piston O-ring backup.
The SAE O-ring and the piston O-ring look almost the same. The SAE O-ring is thinner than the hydraulic
piston O-ring.
Do not use soap, detergent, or solvents.
Concave side
SAE O-ring Hydraulic piston O-ring
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