Section 5: Trouble-Shooting and Repair
MicroBlaster MB1005
Comco Inc.
5-6
Issue Date: September 2003
The Handpiece Nose
The handpiece nose is the main part of the handpiece that holds the nozzle. The nose
holds together the abrasive hose, handpiece tube and the nozzle. Abrasive will wear
away the inside of the nose to a point where it can no longer support the hose. Also, if
the nozzle is not tightened firmly into the nose, abrasive leakage will wear away the
threads and the nozzle will not fit properly.
Handpiece Nose Replacement Procedure (MB1230-1)
1.
Remove the nozzle and O-ring.
2.
Unscrew the handpiece tube from the nosepiece and slide it back.
3.
Remove the hose from the nosepiece (it may be easier to cut hose).
4.
Slip the hose onto the nosepiece. Sometimes a little moisture helps.
5.
Screw on the handpiece tube.
6.
Install the nozzle.
The Abrasive (Blue Poly) Hose
(refer to Appendix B, Figure 8)
An obviously worn or burst abrasive hose may be cut back slightly beyond the problem
area in order to be reused. If this cannot be done, the hose should be replaced. The
entire abrasive hose handpiece assembly (MB1083-3) can be replaced, or individual
pieces, as necessary.
CAUTION:
Always use the proper hose when replacing
a worn or damaged abrasive hose. The use
of a different hose or a hose with a different
pressure rating may present a hazard.
Abrasive Hose Replacement Procedure
1.
Turn the power off and unplug the power cord.
2.
At the rear panel of the MicroBlaster, loosen the hose connectors blue
Quicknut from its connector. The Quicknut should be hand tight but, if
necessar
y, use a 7/16” open end wrench to loosen.
3.
Remove and save the Quicknut and rubber grommet from the old hose.
4.
Pull the hose through the pinch tube.
5.
Inspect the hose connector for wear and replace if necessary.
6.
Inspect the pinch tube and pinch plunger as described on the following
pages.
