MicroBlaster MB1005
Section 5: Trouble-Shooting and Repair
Comco Inc.
5-9
Issue Date: September 2003
Inspecting and Repairing the Pinch Valve
(cont’d)
3.
Unscrew the pinch tube completely (Item 3). Inspect the pinch tube and
pinch plunger as described above.
4.
Inspect the piston rod by pulling it out about 2". It should be clean, dry (not
oily), and not “gritty”. Wipe thoroughly. The rod should retract easily when
released. Note that the Abrasive Pinch has a 10-15 second delay.
5.
Install the pinch tube. It should be hand tightened all the way on to the
cylinder and then backed off about 3 turns until the hole is horizontal.
Install the hose (see procedure, above).
If required, replace the pinch assembly according to the following procedure:
Pinch Assembly Replacement Procedure
1.
Unplug the MicroBlaster and remove the cover (4 screws).
2.
Disconnect the solenoid wires from the electrical terminals and mark the
terminals in order to replace the new connections correctly.
3.
Disconnect the air hose (depending on the model, you must unscrew the
connector nut, or push down and hold the red retaining ring and pull the
hose out).
4.
Turn the MicroBlaster on its side.
5.
Remove two screws from the bottom of the unit and remove the pinch.
6.
Install a new pinch with the pinch tube extending out through the back of
the unit.
7.
Tighten the screws and place the MicroBlaster flat on the table.
8.
Reconnect the air hose. Make sure it is firmly in place.
9.
Replace the wires to the terminal board (polarity is not important).
10.
Install the abrasive hose (see Replacing Abrasive Hose procedure above).
11.
Replace the cover.
Summary of Contents for MB1005-1
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