Donaldson Torit Dust Collector UMA 72

Isolate electrical supply and remove fan chamber lid

Disconnect electrical wiring to terminal box

Remove the four bolts securing the motor drive bed-plate and withdraw the complete assembly from the unit case

Loosen, but do not remove, the four socket screws in the base flange and withdraw drive cover

Remove the six nuts securing flange of bearing housing to the bed-plate and withdraw the housing

Remove fan pulley and the six bolts securing the fan case

Remove fan impeller and fan case

Remove end caps and spacers from fan bearing housing

1) Flameproof maintenance – It is important that all flameproof enclosures, motors, and cable glands are inspected for corrosion and tightness on an annual basis.

In particularly aggressive environments, this inspection should be carried out more frequently.

2) Antistatic earthing (if fitted) – Check collector earthing continuity.

3) Explosion risks – Check measures taken to avoid ignition sources are still in place.

4) Fan maintenance – Inspect the fan thoroughly. This is achieved on UMA 40 collectors by removing acoustic diffuser, if necessary, and looking through cleaned air outlet; on UMA 40MM collectors by unbolting and removing fan power pack and inspecting; on all other collectors by unbolting and rotating fan assembly and looking through fan inlet eye.

If necessary, remove all residual dust accumulation. (Although the fan is located on the clean side of the collector, it is possible for low quantities of dust to migrate through the filter media).

The fan should be inspected immediately after any period of significant dust emission, i.e. due to damaged filter media or seal etc.

The fan should be inspected immediately if there is any unexpected noise, temperature or vibration.

The fan should be inspected every twelve months or immediately following any misuse.

Warning: This inspection requires trained personnel with PPE!

Any abnormal change in pressure differential across the filter assembly?

Enter the filter resistance in mm WG

For UMA 750 collectors, a resistance of 125 to 175 mm WG may be expected.

Is the secondary or absolute filter monitor functioning properly?

Door fastener threads lubricated?

Ignition minimising fans are fitted with a lining inside the casing?

Sign off on the dust collector inspection

Every 1000 working hours the following parts should be checked:

2) Rubber seals – for tears and over-compression.

3) Shaker mechanism with particular attention to:

- Broken locators on shaker bar.

- Torn shaker bar support strap(s).

Fan assembly removal/replacement (UMA 70-750)

Isolate electrical power supply.

2 On UMA 750 collectors only – Remove door frame centre member, remove mattress support frame from its storage position and remove fork lifting beam.

3 Disconnect electrical cables from terminal box.

4 Remove fan outlet grille cover plate.

6 The fan assembly can now be removed using a suitable lifting arrangement.

Renewing fan impeller and/or motor: