Applicable Systems
Electra Saver

Symptoms

Motor bearing vibration velocity exceeds 4.5 mm/s RMS. The Electra Saver smart controller logs a Major alarm based on the integrated vibration sensor on the motor drive-end.

Possible Causes

  • Motor bearing grease depleted or contaminated after extended service interval
  • Bearing inner race or rolling elements showing early fatigue spalling
  • Motor misalignment or soft foot causing dynamic forces on the bearings
  • Belt over-tension increasing radial load on the drive-end bearing

Troubleshooting Steps

  1. Step 1: Verify the vibration reading with a handheld analyzer at the same measurement point
    If the portable analyzer also reads >4.5 mm/s, schedule bearing replacement within 500 hours
  2. Step 2: For motors with grease fittings, pump the specified quantity of polyurea NLGI 2 grease
    Wipe off purged old grease. Do not over-grease - excess causes churning and higher vibration
  3. Step 3: Check motor soft foot by loosening each foot bolt one at a time and measuring the gap with a feeler gauge
    Shim any gap >0.05 mm. Re-torque foot bolts to specification in a star pattern
  4. Step 4: Check belt tension with a tension gauge - deflection should be 12 mm per 300 mm of span
    Adjust motor slide rails and verify pulley alignment with a straightedge or laser tool

How to Reset

Reset: After bearing replacement, alignment correction, or greasing, press Reset. The alarm clears when vibration drops below 3.5 mm/s RMS for a continuous 10-minute run.

Common Replacement Parts

  • GD-1020: Motor bearing kit, 6314/6312 (Drive-end and non-drive-end, C3 clearance)
  • GD-1021: Belt tension gauge (Sonic type, for V-belts and multi-rib belts)
  • GD-1022: Motor alignment shim set (Stainless steel, 0.05-2.0 mm, assorted)

Frequently Asked Questions

  • Q: How often should motor bearings be greased?

    Every 4000 hours for regreasable bearings. Sealed bearings require motor replacement when vibration rises above 7.1 mm/s.

  • Q: What is soft foot?

    A condition where one motor foot does not sit flat on the base, causing frame distortion and bearing misalignment when bolts are tightened. Always check with feeler gauges.

Related Gardner Denver Fault Codes

Source: Gardner Denver Electra Saver II Operation and Maintenance Manual, GD-ESA-II-OM

Category: Compressor