Section 5: Trouble-Shooting and Repair
MicroBlaster MB1005
Comco Inc.
5-14
Issue Date: September 2003
Air Pressure Regulator Assembly
The Air Pressure (Cutting Speed) regulator adjusts the source air pressure down to a
useful blasting pressure as indicated by the gage. The regulator assembly contains the
regulator, check valve, filter and hose fittings. Refer to Appendix B, Figure 11.
Indications of a regulator failure:
a)
Gage goes to “Max” at idle but drops drastically when blasting.
b) Regulator knob will not turn in either direction.
c) Regulator knob turns freely, but never tops or bottoms out (no high or low stop).
Replace the Regulator Assembly according to the following procedure:
Air Pressure Regulator Assembly Replacement Procedure
(
Refer to Appendix B,
Figure 11, or contact Comco for part number.)
1. Turn Power OFF.
2. Remove the MicroBlaster cover (4 screws).
3. Using a 7/16" open-end wrench, remove the hose connector nuts and hoses from
the regulator assembly. You may want to label each air hose before removing.
4. Remove the retaining nut from the front of the regulator.
5. Pull the regulator assembly back into chassis and remove.
Note:
It may be necessary to remove the cap from the knob in order for it to fit through
the front panel. Squeeze the sides of the cap and pop it off (similar to removing
a child-proof cap from a pill bottle). You will need to do the same with the new
regulator. There is a spacer underneath the cap. Be sure to replace it before
replacing the cap.
6. Install the new regulator with the filter up.
7. Attach the tubing to the regulator assembly and tighten the nuts.
8. Install the cover.