HyPrecision 50S/60S/75S Operator Manual 808690 115
5 – Preventive maintenance
Preventive maintenance
1. Examine the seal housing and the high-pressure seal backup. Make sure that the weep holes and the inside
grooves are clean.
2. Put O-ring lubricant on the backup ring and the seal housing O-ring.
3. Put the seal housing O-ring backup and the seal housing O-ring on the seal housing. Put the O-ring on the
side nearer the narrow end of the seal housing.
The seal housing O-ring backup has a flat side and a concave side. Make sure the flat side of the O-ring
backup faces the wide end of the seal housing. The O-ring fits into the concave groove on the O-ring
backup.
4. Put the plunger bearing on the plunger and push it into the hydraulic end cap.
5. Put a small quantity of clean hydraulic fluid on the inside and the outside of the rod seal.
6. Put the rod seal onto the plunger with the wider side toward the hydraulic end cap.
Do not push the rod seal into the hydraulic end cap.
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