Gear Coupling Installation and Alignment Checklist

Step-by-step checklist for gear coupling installation and shaft alignment.

Proper installation and alignment are critical for gear coupling performance and longevity. This comprehensive checklist ensures correct procedures are followed every time.

Pre-Installation Checklist

Equipment Verification

Verify coupling model matches specification
Confirm bore sizes match shafts
Check keyway dimensions
Inspect coupling for shipping damage
Verify all components are present

Shaft Preparation

Clean shaft surfaces thoroughly
Remove burrs and nicks
Verify shaft dimensions within tolerance
Check keyway dimensions
Apply light oil film to shaft

Tool Preparation

Heat source for hot mounting (if required)
Temperature measuring device
Alignment tools (dial indicators/laser)
Torque wrench for fasteners
Grease and filling equipment

Hub Installation

Interference Fit (Hot Mounting)

Calculate heating temperature
- Temperature rise = (Interference × 1000) / (Bore × α)
- Typically 80-120°C above ambient
Heat hub uniformly
- Use oven or induction heater
- Never use open flame on bore
- Verify temperature reached
Mount quickly
- Position hub immediately
- Slide to correct axial position
- Insert key before cooling
- Hold in position until cooled
Verify mounting
- Check axial position
- Confirm key properly seated
- Allow to cool completely

Clearance Fit (Cold Mounting)

Apply retaining compound (if specified)
Slide hub onto shaft
Position axially per drawing
Secure with setscrew or lock nut
Tighten to specified torque

Alignment Procedure

Rough Alignment

Position equipment approximately aligned
Install soft foot (shim motor feet)
Achieve rough alignment visually
Secure equipment loosely

Final Alignment

Angular Alignment

Mount dial indicator on hub face
Measure TIR at multiple points
Calculate angular deviation
Adjust to within specification

Coupling Speed	Angular Tolerance
<1500 RPM	0.5° per mesh
1500-3000 RPM	0.3° per mesh
>3000 RPM	0.2° per mesh

Offset Alignment

Mount dial indicator on hub OD
Measure TIR through one revolution
Calculate offset
Adjust to within specification

Coupling Speed	Offset Tolerance
<1500 RPM	50% of max rated
1500-3000 RPM	30% of max rated
>3000 RPM	20% of max rated

Axial Gap Setting

Measure gap between hub faces
Compare to specification
Adjust motor/driven position if needed
Re-verify alignment after adjustment

Sleeve Assembly

Full Gear Coupling

Separate sleeve halves (if split)
Engage teeth carefully - avoid forcing
Center sleeve axially
Install and torque bolts in star pattern
Verify free rotation

Half Gear Coupling

Position sleeve on gear hub
Align bolt holes with flange
Install and torque bolts
Check for binding

Lubrication

Initial Fill

Use specified grease grade
Fill to 50-60% of void volume
Ensure grease reaches all teeth
Wipe excess from seals

Grease Quantity Guide

Coupling Size	Approximate Fill
Small (<150mm OD)	200-500g
Medium (150-300mm)	500-1500g
Large (>300mm)	1500-5000g

Final Checks

Before Startup

All fasteners properly torqued
Guards installed correctly
Oil cups or grease fittings accessible
Free rotation by hand
Recording baseline readings

Initial Startup

Run without load briefly
Monitor for noise, vibration, temperature
Check for leakage
Record readings for future reference

After Thermal Stabilization

Re-check alignment after warm-up
Verify temperatures normal
Record hot alignment readings
Document all installation data

Common Installation Errors

Error	Consequence	Prevention
Cold installation of interference fit	Hub cracks, slips	Always heat properly
Misaligned shafts	Rapid wear, vibration	Use proper alignment tools
Wrong grease quantity	Overheating or leaks	Follow specifications
Missing alignment check	Reduced life	Always verify alignment

Contact SMI for installation support and technical guidance.