Greasing pump and fan bearings: schedule vs condition

Pumps and fans (ID fans, forced-draught, cooling) are the most frequent lubrication route points after electric motors. The questions "how do I grease pump bearings" and "how do I grease fan bearings" almost always come down to the same thing: the calendar does not match the real load, and the fitter compensates with extra strokes of the grease gun.

How a pump and a fan differ from "just a motor"

People often treat the bearings of the machine itself and the bearings of the driving motor as one point. That is a route-map error:

Assembly	Specifics
Motor	Usually grease, nipples on the end shields; see motor lubrication
Pump (casing / bracket)	Separate chambers are possible, influence of the pumped medium, vibration from cavitation
Fan / ID fan	High speed, blade unbalance, gas path temperature, vertical shafts

Different grease brands on adjacent points is normal. Mixing them is not (incompatibility).

Typical lubrication-driven failure scenarios

1. Over-greasing a pump "after a vibration alarm" — the vibration came from cavitation or misalignment, but grease was pumped into the chamber. Temperature rose, the seal was pushed out. See over-greasing and pump cavitation.
2. A hot fan bearing → "add more grease" — often it is already churning from excess. See why a bearing runs hot.
3. The same interval in winter and summer — grease in an ID fan on a hot gas path lives very differently from a fan in a cold warehouse.
4. Greasing with the drain closed on pedestal pump bearings.

The procedure: what to keep, what to replace

Keep in the procedure:

• the approved grease brand (choosing a grease);
• the maximum single dose (the formula as a ceiling);
• the requirement for a clean nipple and an open drain (technique).

Replace the "hard date" with:

• a walkdown measuring friction / temperature / vibration;
• a grease / skip / stop decision based on condition.

Why interval tables lie — how often to grease bearings.

A practical route for the pump / fan house

1. List the critical machines (standby hot-water pumps, boiler ID fan, process pumps).
2. Separate points: motor DE/NDE, machine bearings.
3. Before greasing — a quick assessment: is there already overheating or evidence of over-greasing.
4. Small doses plus a stop based on the drain or on the acoustics.
5. A CMMS record: date, volume, result.

Where ultrasound helps

On pumps and fans ultrasound is useful twice:

• before greasing — does this point need touching at all today;
• during — when the film is restored and it is time to stop.

For route work, use LUBExpert and the lubrication mode of the SDT340. On critical pumps that are rarely visited, consider condition-based automatic lubrication (LUBExpert ON-GUARD) — a comparison of the approaches is in manual vs automatic lubrication.

KEG TRK supports lubrication programmes for pump and fan fleets across Kazakhstan. Consultation.