Liebert Essential Maintenance for Blower Bearings and Motors: Replacement, Inspection, and Care

Maintenance

Figure 84 Auto-belt tensioning motor base

Spring

Housing

Motor Base

Carriage

Minimum 1/2”

(13mm) Gap

Motor Plate		DPN000995
Adjustment Slot
	Adjustment Nut	Rev. 0

Blower Bearing Maintenance

•Field lubrication is NOT required for the life of the bearing.

•Bearings are permanently sealed and self-lubricating and cannot be greased.

Blower Bearing Inspection

1.Disconnect power to unit.

2.Remove drive belts (see 12.2.2 - Belt Removal).

3.Inspect bearing for tightness of set screws and mounting bolts.

4.Rotate fan wheel by hand.

5.Listen for unusual noise and look for signs of unusual play.

Blower Bearing Replacement

1.To maximize performance and reliability of Liebert DS equipment, use only SealMaster Reduced Maintenance pillow block bearing with tapered lands race and double lock set screws. Contact local Emerson representative to order replacement bearings.

2.Properly mount and align bearings on shaft. Tighten set-screws in proper sequence and to proper torque using a torque wrench in accordance with the manufacturer’s instructions.

Blower Motor

Inspect motor at regular intervals. Keep motor clean and ventilation openings clear of dust, dirt and other debris.

Blower Motor Lubrication

•Motor comes pre-lubricated from factory and does NOT require initial lubrication.

•Emerson recommends a 5-year lubrication interval for motor bearings that have grease fittings.

•Greases of different bases may not be compatible when mixed.

•Contact specific motor manufacturer to determine type of grease to be used.

Blower Wheel

Check to see if wheel(s) are tightly mounted on fan shaft. Rotate wheel(s) and make sure they do not rub against fan housing. The wheel(s) should be periodically cleaned of dirt and debris.

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