Oil Seal Installation Guide

Proper installation is critical for oil seal performance and longevity. Follow this step-by-step guide to ensure correct fitting and avoid common failures.

1. Pre-Installation Checks

✔ Inspect the Seal

· Verify size (ID, OD, width) matches shaft/housing specifications.

· Check sealing lip for damage, cracks, or contamination.

· Ensure garter spring is properly seated (if applicable).

✔ Prepare Shaft & Housing

· Shaft: Polish to Ra ≤ 0.8μm (remove burrs/rust with 400+ grit sandpaper).

· Housing Bore: Clean thoroughly (no chips or debris).

· Lubricate: Apply compatible grease (lithium-based) to lip and shaft.

✔ Tools Required

· Mandrel/press tool (matches seal OD)

· Shaft protector (for threaded/keyed shafts)

· Soft-faced hammer (if pressing manually)

2. Installation Methods

A. Press-Fit Installation (Housing Mount)

1. Align seal squarely with housing bore.

2. Press evenly using a sleeve tool (contact outer metal case ONLY).

3. Stop when flush with housing face (avoid over-pressing).

B. Shaft Mount Installation

1. Cover shaft threads/keyways with protective tape/sleeve.

2. Slide seal onto shaft (lip facing fluid side).

3. Use a conical guide to prevent lip flipping.

Critical Notes:

· Lip orientation: Spring side must face the fluid being sealed.

· Avoid: Hammer strikes directly on seal, misalignment, or twisting.

3. Post-Installation Verification

✔ Visual Check: No tilt, lip distortion, or metal case damage.
✔ Rotation Test: Shaft should turn smoothly (excessive drag indicates misalignment).
✔ Lubrication: Prime seal with oil/grease before startup.

4. Common Mistakes & Consequences

5. Special Cases

· High Speed (>10m/s): Use PTFE-coated or dual-lipped seals.

· High Pressure: Reinforced metal-case seals (e.g., FKMPP).

· Chemical Exposure: FKM or PTFE material seals.

Pro Tips

● For tight fits: Heat housing to 80-100°C (expands bore slightly).
● Critical apps: Use installation fixtures for perfect alignment.

Proper installation ensures maximum seal life—take the time to do it right! Need troubleshooting help? Ask for details.