Donaldson Torit Dust Collector UMA 756

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

Warning: For trained personnel only

Open secondary/absolute filter door

Lift bar to release sealing mechanism for UMA 40MM

Undo clamping nuts or clips as appropriate and remove retaining mesh or frame for UMA 100-450

Undo clamping nuts sufficient to allow element removal for UMA 750

Remove used element, place it directly into a plastic bag and then seal the bag

Slide the new element into the housing, with the element seal against the secondary/absolute filter seal frame, until it reaches the backstop

Clamp element in position using the arrangement provided

Close secondary/absolute filter door

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

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: Due to the weight of the mattress assembly, it should not be removed without using the support frame provided.

Isolate electrical controls and open front access doors.

Remove the mattress support frame from its storage position in the fan chamber or on the top plate of venting type collectors, and assemble into door frame.

Lower the mattress assembly using the extended nuts on the front of the door frame.

Slide the mattress assembly out of the collector onto the mattress support frame.

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.

Detach filter bag assembly from supporting frame.

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

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.