Seals and Wipers

Seals are the elements that actually hold pressure. The piston seal closes the passage between the two chambers of the cylinder; the rod seal keeps oil from escaping. The wiper works in the opposite direction — as the rod retracts, it scrapes dust and dirt off the surface and prevents them from entering the cylinder.

Three things determine seal life: oil temperature, surface finish and whether the piston stays centered. When temperature rises above the band, the material hardens; when the rod surface is scored, the seal lip is cut; when the guide element wears, the seal is loaded from one side only. This is why frequent seal replacement is usually not a seal problem but the symptom of another part.

Part List

The list below gives the part name, manufacturer, manufacturer code and size. Type a manufacturer code or a dimension into the search box to filter it.

Is it time to replace?

• An oil film on the rod, dripping underneath the machine
• The cylinder drifting back where it should stand still
• One-sided, asymmetric seal wear — check the guide element
• A torn wiper lip, dirt building up on the rod

What to send us when you order

1. Manufacturer code, or the dimensions: inner diameter × outer diameter × height
2. Seal type: rod seal, piston seal, wiper
3. Operating temperature and hydraulic oil type
4. Machine model and the unit the cylinder belongs to

Other part groups