Donaldson Torit Dust Collector UMA 100STU

1 Isolate electrical controls and open fan and filter chamber access doors.

2 Fully slacken the four captive wing-nuts located in the fan chamber, on the top plate of venting type collectors or in the side outlet box.

3 With the aid of a colleague, withdraw the complete filter assembly through the front of the filter chamber.

4 Remove wire mesh insert frames from individual filter bags. These should be checked for broken mesh and worn material edgings, especially around the area of any filter bag damage.

5 Detach filter bag assembly from supporting frame.

6 Fit new filter bag assembly into supporting frame, feeding individual filter bags between locating bars, and fold collar over peripheral sealing flange.

7 Prior to fitting wire mesh inserts, any material edgings that need replacing should be fitted around the three edges of the insert that do not have the insert frame joint. The inserts should then be fitted, edging first, into the filter bags.

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:

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

Pressure drop across the filter assembly

Record the figure in the log book

Pressure drop increased significantly over two or three successive checks?

Check the filter if pressure drop increased significantly

Pressure drop across the secondary or absolute filter

Change the filter when the pressure drop reaches 100 mm W.G.

Inspect the explosion relief assembly weekly

Ensure the bursting panels are intact and clear of obstruction

Prevent build-up of snow or ice on explosion panels during winter

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.