4. ASSEMBLY & OPERATION
WARNING! Before operating the unit ensure you read, understand and apply Section 1 Safety Instructions.
Note: Numbers in brackets refer to the item numbers in the Parts Lists and Diagrams, Section 7.
4.1.
Model SB990
4.1.1. Tighten air valve (10) on upper ‘T’ piece (A) using locknut (6).
4.1.2. Screw fitting (11), supplied fitted to water separator (12), into air valve (10). Tighten so that separator body hangs vertically downward.
4.1.3. Slacken lid (1) retaining nuts and allow eye bolt (3) to swing down. Swivel lid and gasket (2) to one side for grit filling.
Do not
exert
any force on lid in open position or lid retaining bolt may be damaged.
4.1.4. Load body of blaster with clean, dry abrasive grit of particle size no greater than 800 microns (0.8mm) diameter and no less than 250
microns. Maximum fill level is just below the upper ‘T’ piece (A).
4.1.5. Ensure that top edge of body, lid gasket (2) and eye bolt (3) threads are free of grit. Replace lid (1), engage eye bolt (3) and tighten
nuts.
4.1.6. Ensure that air valve (10) is closed and then connect blaster to air supply via fitting (13).
4.1.7. Adjust the air supply pressure to suit the workpiece (if in doubt start with a low pressure and gradually increase it to achieve required
cleaning).
4.1.8. Point the blast nozzle (15) at the workpiece, or a safe area, and turn on air valve (10).
4.1.9. Move the blast stream over the workpiece in an even, circular motion. To avoid peening the flow should not be concentrated at one
area.
4.1.10. Turn off air valve (10) to stop blasting. Allow all air pressure to exhaust from the unit before releasing hold of the nozzle.
4.2.
Model SB991
4.2.1. Slacken lid (1) retaining nuts and allow eye bolt (3) to swing down. Swivel lid and gasket (2) to one side.
Do not
exert any force on
lid in open position or lid retaining bolt may be damaged. Remove handle (19) and pressure gauge (B) from body of blaster.
4.2.2. Fit unplugged end of handle into bracket on rear of body and tighten clamping bolt (21).
4.2.3. Screw pressure gauge (B) into port in filter/separator/regulator (12).
4.2.4. Load body of blaster with clean, dry abrasive grit of particle size no greater than 800 microns (0.8mm) diameter. We recommend
Sealey Blasting Grit, part number B/25KG. Maximum fill level is just below the upper ‘T’ piece (A).
4.2.5. Ensure that top edge of body, lid gasket (2) and eye bolt (3) threads are free of grit. Replace lid (1), engage eye bolt (3) and tighten
nuts.
4.2.6. Ensure that air valve (10) is closed and then connect blaster to air supply via fitting (13).
4.2.7. Adjust the regulator (12) pressure to suit the workpiece (if in doubt start with a low pressure and gradually increase it to achieve
required cleaning).
4.2.8. Point the blast nozzle (15) at the workpiece, or a safe area, and turn on air valve (10).
4.2.9. Open grit valve (10A), fully if using 800 micron grit or adjust as required if using smaller.
4.2.10 Move the blast stream over the workpiece in an even, circular motion. To avoid peening the flow should not be concentrated at one
area.
4.2.11. Turn off grit valve (10A) and then air valve (10) to stop blasting. Allow all air pressure to exhaust from unit before releasing hold of
nozzle.
Note: The higher the blast pressure the quicker you can work, but the nozzle (15), blast hose (14) and lower ‘T’ fitting (7) will wear
faster too. Use the lowest pressure that gets the work done satisfactorily.
5. MAINTENANCE
WARNING! Disconnect from the air supply before performing any maintenance!
WARNING! The following items should be checked on a regular basis.
5.1.
Blast Nozzle -
Check for wear and replace as necessary.
5.2.
Blast Hose -
This hose will wear quickest near the lower ‘T’ piece (7). Check this 300mm section regularly for early signs of
blistering. Cut off and discard worn section. To reduce wear rate keep hose adjacent to ‘T’ as straight as possible.
5.3.
Lower ‘T’ Piece -
This will wear in the output leg. Check regularly and when wear becomes noticable rotate ‘T’ piece through 180O.
Replace when both legs are worn.
5.4.
Hoses & Clips -
Replace immediately at any sign of damage.
5.5.
Lid Gasket -
Check to ensure it provides an airtight seal.
5.6.
Eye Bolts & Nuts -
Check that threads are in good condition (tightening nuts with abrasive grit present will cause damage).
5.7.
Water Separator -
Drain before use by loosening drain screw while separator is pressurised.
6. TROUBLESHOOTING GUIDE
PROBLEM
CAUSE
SOLUTION
Air and grit flow stops
Grit flow stops, air flow OK
1) All grit used
2) Lower ‘T’ piece blocked
1) Replenish.
2) Turn off air valve.
Turn off grit valve (SB991 only).
Remove lower ‘T’ piece and clear blockage.
3) See ‘Note’ below.
Spluttering grit flow (SB991)
Grit-to-air ratio too high
Reduce grit flow by adjusting grit flow valve.
Nozzle blocked
Immediately turn off air valve.
Turn off grit valve (SB991 only).
Disconnect air supply and reopen air valve to vent unit.
Remove nozzle and clear blockage.
Note:
If, when clearing a blockage of the lower ‘T’ piece, the grit is found to be damp, this indicates moisture in the air supply. The situation
can be improved by effecting some or all of the following:
• If possible locate compressor in a low humidity area.
• Use supply from largest compressor/receiver available.
• Keep compressor/receiver well ventilated and, therefore, cool. • Drain receiver frequently.
• Use a longer air line between compressor and blaster.
• Fit an additional water separator on the compressor.
Original Language Version
SB990, SB991 Issue: 3 - 19/10/09
