Section 4: Maintenance
MicroBlaster MB1005
Comco Inc.
4-6
Issue Date: September 2003
Parts Subject to Normal Wear
(cont’d)
Tank Cover
The tank cover seals the abrasive tank and allows for replenishing the abrasive
powder.
Always fill the tank through the Powder Quick Fill hole and refrain from
removing the tank cover unless absolutely necessary.
Whenever the tank cover is
removed to change powder, excess powder must be brushed off the top of the tank
and out of the threads. A small stiff brush is ideal for this purpose.
At weekly intervals (or as necessary), spray or wipe a dry lubricant such as graphite,
molycote, or Teflon powder on the tank threads (order Comco P/N ST8062). If an
aerosol dispenser is used, or the lubricant is suspended in a solvent, allow a few
minutes for the solvent to dry before installing the cover.
Do not over tighten tank cover when installing. The cover is designed to self-seal when
the tank is pressurized. Light hand tightening is all that is required when installing the
tank cover. Excessive tightening will only lead to premature O-ring wear.
Inspect the tank cover monthly for worn O-rings and threads. If the O-rings become
worn, order the Comco O-rings ST5624 (Flapper) and ST5022 (Tank).
Tank Cover Threads
As the tank cover is twisted on, any abrasive trapped between the tank and the tank
cover threads tends to grind the threads a small amount. Since the MicroBlaster tank is
a pressurized device, this action may eventually reduce the thread engagement to a
danger point. Always clean the tank and tank cover threads before installing the cover.
Eventually the threads will wear to the point that the cover will need to be replaced. The
tank cover utilizes an ACME type thread that will change its shape as it wears. You
should periodically inspect the threads visually for excessive wear. Another indicator of
worn threads is that the cover will feel excessively loose when installing or removing.
GOOD WORN
Figure 4-2:
Tank Cover Thread Wear
