Donaldson Torit Dust Collector UMA 250STU

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:

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.

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).

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

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 fitted?

Is the general casing integrity intact?

Are door fastener threads lubricated?

Is the ignition minimising fan's lining inside the casing intact?

Sign off on the dust collector inspection