16-Year Veteran Technician’s Hands-On Solutions: 90% of Issues Do Not Require After-Sales Service

Low Pressure, Excessive Dust, Uneven Blasting? Stay Calm, Most Problems Can Be Resolved In Minutes

Minor failures are unavoidable after long-term use of sandblasting equipment. If you wait for after-sales technicians for every breakdown, downtime may last half a day up to two or three days, bringing substantial production losses.

With 16 years of experience manufacturing sandblasting equipment, the after-sales team of Boen Machinery has sorted out the 8 most frequent faults. 90% of these issues are not complicated and can be troubleshooted and fixed by yourself within minutes. Bookmark this guide for emergency reference.

1. Insufficient Blasting Pressure & Reduced Efficiency

Common Causes & Solutions

• Insufficient air supply from air compressor: Check whether the compressor power matches requirements; inspect air hoses for bending or air leakage.
• Worn & enlarged nozzle: Long-term operation wears the inner nozzle wall and expands the bore, resulting in pressure drop. Replace with a new nozzle.
• Blocked abrasive hose: Large impurities clog the pipeline. Shut down the machine and clean the hose and abrasives.
• Worn air inlet sealing ring: Poor sealing at connections leads to air leakage. Install a new sealing ring.

2. Uneven Blasting Result with Variable Shades

Common Causes & Solutions

• Improper nozzle angle: Adjust distance and angle between nozzle and workpiece. The optimal setting is 15–20cm distance at a 45° angle.
• Poorly mixed abrasives: Mixing new and used abrasives or damp, agglomerated abrasives. Switch to dry, uniform new abrasives.
• Unstable moving speed: Inconsistent manual operation speed; adjust conveying speed for automatic machines to maintain uniformity.
• Partial nozzle wear: Uneven fan-shaped jet caused by one-sided inner wear. Rotate the nozzle or replace it.

3. Dust Leakage & Poor Dust Removal Performance

Common Causes & Solutions

• Clogged filter cartridge: Excessive dust accumulation. Clean or replace cartridges regularly (monthly cleaning recommended).
• Aged sealing rubber strips: Worn cabin door strips cause air leakage. Replace sealing strips.
• Insufficient fan airflow: Inspect fan operation and clear dust buildup on fan impeller.
• Excess fine dust in abrasives: Use qualified abrasives with uniform grain size to reduce ultrafine dust generation.

4. No Abrasive Output or Intermittent Sand Flow

Common Causes & Solutions

• Empty abrasive tank: Refill abrasives timely.
• Sand valve opening too small: Increase sand valve opening.
• Bent or blocked abrasive hose: Straighten the hose; clean blockages after shutdown.
• Damp and agglomerated abrasives: Dry abrasives or replace with dry sand; avoid damp abrasives.

5. Abnormal Noise During Machine Operation

Common Causes & Solutions

• Unbalanced dust-covered fan impeller: Clean dust deposits on the fan impeller.
• Loose pipeline connections: Tighten all connecting bolts.
• Foreign matter inside blasting gun: Clear impurities inside the blasting gun.

If abnormal noise persists and the source cannot be identified, shut down the machine immediately and contact after-sales service. Do not operate the equipment with faults.

6. Pitting & Impact Damage on Workpiece Surface

Common Causes & Solutions

• Excessively high working pressure: Lower operating pressure appropriately.
• Overly coarse abrasive grains: Switch to finer abrasives.
• Nozzle too close to workpiece: Increase blasting distance.
• Large impurities mixed in abrasives: Screen abrasives or replace with new sand.

7. Severe Abrasive Accumulation Inside The Cabin

Common Causes & Solutions

• Reduced cyclone separator efficiency: Clean dust inside the separator and adjust airflow volume.
• Excessive fine powder in abrasives: Adopt high-quality abrasives with less fine dust. Clean accumulated abrasives at the cabin bottom regularly to avoid disrupting equipment operation.

8. Electrical System Malfunctions

Common Causes & Solutions

• Machine fails to start: Check power supply, emergency stop buttons and tripped thermal relays.
• Overheated motor: Inspect overload status and voltage stability; restart after cooling down.

Electrical faults should be inspected by professional electricians. Do not disassemble the electric control box without authorization.

Closing Remarks

Regular daily maintenance can drastically reduce equipment failures: clean filter cartridges periodically, inspect wearing parts and use qualified abrasives. Service life of equipment can be extended by more than 30%.

If you encounter unsolvable faults, all Boen Machinery customers enjoy 7×24-hour technical support with response within 1 hour. General issues will be solved via video guidance. Required spare parts will be shipped by SF Express to minimize downtime losses.

Do you have unsolved equipment failures? Leave a message or contact us. Our technical team provides free troubleshooting consultation.