Preparation
Cleaning & Inspection: Clean bearings and shaft necks with refined kerosene to ensure no metal debris residue. Check shaft neck diameter deviation (≤0.01mm) and bearing seat roundness error (≤0.02mm). Repair if out of tolerance . Verify bearing model matches drawings and measure radial clearance meets requirements
Installation Methods
Hot Mounting Method (Recommended)
Heat bearings in oil to 80-100℃, maintain for 30 minutes, then quickly mount onto shaft journal . Bearings must not contact tank bottom—suspend them . Never use acetylene flame for heating .
Cold Press Method
For light interference, use a copper rod to strike the inner ring face (never strike outer ring or transmit force through rolling elements) . For greater interference, use hydraulic press with pressure gradient ≤2mm/s .
Seating Requirements
Bearings must seat firmly against shaft shoulders with no gaps or looseness . After cooling, rotate by hand—movement should be smooth, cage normal, no striking sounds
Critical Fit Parameters
| Item | Requirement |
|---|---|
| Bearing-shaft interference | 0.02-0.05mm |
| Radial clearance, outer ring to cover | 0.05-0.10mm |
| Shaft diameter deviation | ≤0.01mm |
| Housing roundness error | ≤0.02mm |
| Axial clearance | By design |
Post-Installation Verification
Test Run: Run without load for 30 minutes, bearing temperature rise ≤25℃, rolling bearing limit 80℃ . Use dial gauge to check axial runout—allowable ≤0.02mm.
Clearance Recheck: For adjustable bearings, set clearance to specified value . Tapered roller bearings require axial clearance adjustment—common methods: shim adjustment or screw adjustment .
