National 3402, Instruction Manual

Page: 11 / 28

Machine Maintenance
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STANDARD FILTER INSPECTION
1. Turn machine off.
2. Knock material off fi lter via the hand shaker, motorized shaker or reverse pulse.
3. Pull up on foot lever to release dustpan then remove and empty if necessary.
4. Lock rear casters (Figure D) then carefully tip machine back onto the push handle.
5. Remove any material between the pleats, by hand only.
6. Inspect the pleats of the fi lter for tears and material blockage.
7. Carefully tip machine back onto the casters and replace dustpan.
STANDARD FILTER REMOVAL
1. First follow preceding Filter Inspection procedure to determine if removal is
necessary.
2. Turn the machine on then block the inlet with a fl at and rigid material to place the
machine under vacuum pressure.
3. Remove all of the housing-component socket truss screws with a 5/32 hex-
wrench (Figure F).
4. Turn the machine off and disconnect the power source.
5. Separate the motor deck from the housing then disconnect the motor deck ground
wire from the subsequent assembly via the push-on terminal.
6. Disconnect the three power cord wires from the terminal block on the underside
of the motor deck (Figure G).
7. Remove the motor deck.
8. Disconnect the clear differential pressure gage tubes from their respective barbed
fi ttings if so equipped.
9. Remove the HEPA fi lter housing spacer and HEPA adapter assembly if so
equipped; make sure to disconnect the HEPA adapter assembly ground wire via
push-on terminal before removing.
10. Remove the reverse pulse/motorized shaker assembly and housing spacer if
so equipped; make sure to disconnect the component ground wire via push-on
terminal before removing (Figure G).
11. Inspect the top of the fi lter for material.
12. Remove the fi lter housing spacer assembly; make sure to disconnect the fi lter
housing spacer assembly ground wire from the base via push on terminal.
13. Turn the fi lter housing spacer assembly over on a table then work the fi lter off the
fi lter shaker insert.
FIG. D
FIG. E
FIG. G
FIG. H
CAUTION:
CLOGGED MATERIAL SHOULD ONLY BE REMOVED BY HAND.
USING AN OBJECT TO DISLODGE MATERIAL MAY TEAR THE FILTER. CONSULT
YOUR NATIONAL REPRESENTATIVE IF MATERIAL BLOCKAGE IS EXCESSIVE.
FIG. F