FKM Oil Shaft Seal 40×55×7 TCV Type High Pressure Oil Seal?

If you work around hydraulic pumps long enough, you start to recognize the designs that quietly save the day. The FKM Oil Shaft Seal 40×55×7 tcv type high pressure oil seal is one of those parts—unassuming, but absolutely critical when excavators and mixers are under heavy load.

Built in the Development Zone, Julu County, Xingtai City, Hebei Province, this TCV layout targets hydraulic pump/motor sealing in earth-moving gear: excavators, road rollers, scrapers, loaders, and the rest of that hardworking crew. In fact, many customers say it’s the first seal they trust when pressure spikes and oil film control get tricky.

Why TCV and why FKM?

TCV indicates a double-lip configuration with a garter spring for stable radial load and a secondary dust lip—handy when contamination is not a theoretical risk but a daily reality. FKM (fluoroelastomer) handles hot hydraulic oil, diesel mist, and occasional chemical splash. To be honest, it’s a practical choice for uptime.

Process flow (how it’s built to last)

- Materials: FKM compound selected by ASTM D471 immersion results; steel case treated to resist micro-corrosion.
- Methods: Precision molding, spring pre-load calibration, ground lip profile per ISO 6194-1.
- Testing: Leakage bench tests at stepped pressures, 72 h thermal soak at 180 °C, dust lip ingress tests, and runout tolerance checks (DIN 3760).
- Service life: Field reports show ≈6,000–10,000 h in clean systems; harsher cycles vary (I guess nothing new there).
- Industries: Construction equipment, mobile hydraulics, cement mixers, quarry machinery, ag powertrains.

Applications in the real world

Hydraulic pumps (travel/rotary), vertical shafts, and motor input ends where pressure reversals happen. A dust-lip helps when mud and aggregate are constant guests. We’ve seen the FKM Oil Shaft Seal 40×55×7 tcv type high pressure oil seal stabilize leakage after maintenance in a road roller fleet—surprisingly quick wins when shafts were polished to Ra ≤ 0.2 μm.

Vendor snapshot (quick comparison)

Case notes and feedback

A quarry excavator’s travel pump had recurring seepage at 0.4 MPa. Swapping to the FKM Oil Shaft Seal 40×55×7 tcv type high pressure oil seal with a micro-honed shaft extended intervals from 6 to 14 months—no drama, just adherence to DIN 3760 housing tolerances and cleaner oil (ISO 4406 18/16/13 target).

Customization and selection tips

- Choose FKM grade for oil chemistry and temp; consider ISO 23936 guidance for aggressive media.
- For persistent pressure >0.6 MPa, ask for back-up rings or modified lip geometry.
- Shaft finish and runout are everything; don’t skip a hardness check (≈55–65 HRC).

Data points are indicative; confirm against your duty cycle, pressure profile, and housing tolerances. Still, this seal has a habit of punching above its weight.

References

1. ISO 6194 (Rotary shaft lip-type seals) – iso.org
2. DIN 3760 (Shaft seals: dimensions and requirements) – din.de
3. ASTM D2000 & ASTM D471 (Rubber classification and immersion) – astm.org
4. ISO 23936 (Elastomers for oil and gas exposure) – iso.org