BNP PRESSURE BLAST CONVERSION KIT Page 9
6.1 Reclaimer Debris Screen
6.1.1 The screen is accessible through the reclaimer
door. With the exhauster off, remove the screen and
empty it daily or when loading media. Empty the screen
more often if parts being blasted causes excessive
debris. Do not operate the machine without the screen in
place.
6.2 Air Filter
6.2.1 The blast machine is equipped with an auto-
drain air filter. The filter automatically drains when
moisture fills the bowl to a certain level. Moist air inhibits
the flow of media. If moisture continues to be a problem,
a dryer or after cooler may be required in the air supply
line.
6.3 Abrasive Trap (optional)
Recommended for 40 mesh and coarser media.
6.3.1 Check and clean the abrasive trap screen and
empty the trap twice a day.
6.4 Blast Hose and Couplings
6.4.1 To avoid unscheduled down-time, inspect the
blast hose for thin spots by pinching it every 6 to 12
inches. Check coupling gaskets and couplings for leaks
and wear.
6.5. Sentinel Metering Valve
6.5.1 Refer to the Sentinel valve owners manual for
7.0 SERVICE MAINTENANCE
7.1 Nozzle
7.1.1 Replace the nozzle when its diameter has
increased by 1/16", or sooner if pressure diminishes
noticeably. Make sure the nozzle gasket is in place
before screwing the nozzle into the nozzle holder.
7.2 Pop-up Valve Replacement
7.2.1 Empty the machine of media as described in
Section 4.1.3.
7.2.2 Depressurize the blast machine, and lock out
and tag out the compressed-air supply.
Failure to observe the following procedure before
performing any maintenance could cause serious
injury or death from the sudden release of
compressed air.
Depressurize the blast machine.
Lock out and tag out the compressed air supply.
Bleed the air supply line to the blast machine.
7.2.3 To gain access to the pop-up valve, remove the
inspection door assembly.
7.2.4 Using a small pipe wrench, unscrew the pop-up
valve guide (Figure 8 Item 12), by turning it
counterclockwise. Remove the pop-up valve and guide
from the machine. Place the new pop-up valve over the
guide, and screw the valve guide (with the pop-up valve
on it) back into position inside the machine. Tighten the
guide as tight as possible without using a wrench.
7.2.5 Put a new gasket on the inspection door and
bolt the door back onto the machine.
7.3 Pop-up Valve Seat Replacement
7.3.1 The easiest method to replace the rubber pop-
up seat is through the reclaimer access door. If for some
reason replacement can not be made through the
reclaimer, observe the warning in Section 7.2, and
empty the machine and bleed the air supply line.
Remove the inspection door assembly and work through
the opening.
7.3.2 Remove the old seat by using a finger,
screwdriver, or similar object, to work the seat out of the
retainer groove.
7.3.3 Push the new seat all the way through the port
and then fit it into the groove. For the last few inches, pull
up on the seat and allow it to "pop" into position.
7.4 Reclaimer Wear Plate Replacement
7.4.1 Remove the reclaimer inlet adaptor and old wear
plate. The wear plate is held in place by screws attached
from the outside of the reclaimer.
7.4.2 Angle the new wear plate into reclaimer inlet
until it is in position with the straight end at the reclaimer
inlet. Using a board or similar object as leverage, pry the
wear plate against the inner wall of the reclaimer and
install sheet metal screws to hold in place. Caulk any
gaps or voids around the wear plate to prevent rapid
wear in those areas.
WARNING
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