Our latest MicroBlaster, the AccuFlo®, is built to last, and we make sure that every blaster is ready-to-go after installation. However, each abrasive environment and application are unique. So, from time to time, an issue may arise.
A list of Frequently Asked Questions and potential solutions are loosely organized below. Click the question to see its answer in the drop-down box. Please use this as a starting point to perform simple maintenance on your own and better understand your Comco system.
If you need further assistance, please call 1-818-841-5500 or use the form below to contact our Technical Support Team.
General
How do I obtain a copy of the AccuFlo manual?
Here is a link to our standard model and tall tank model AccuFlo: AF10 manual
If you need to access a manual for one of the models listed below, please contact our Technical Support at 1-818-841-5500 or techsupport@comcoinc.com.
- AF10-C: Constant Air Bleed
- AF10-CH: Constant Air Bleed High-Pressure
- AF10-H: High Pressure
- AF10-E: Electronic Regulator
How do I set up my new AccuFlo?
- Read your equipment manual.
- Check out this post which walks through setting up a manual system (video included!)
- Before you begin blasting, read 5 Ways to Break Your Blaster for a quick guide on what not to do.
How do I remove my Machine Cover?
Why do I need a Tune-up Kit?
The AccuFlo Tune-up Kit provides a backup of all wear items on the AccuFlo. A tune-up kit includes one of each of the following:
- PowderGate output fitting
- PowderGate nose piece
- Tank cover O-ring
Use this table to select the right kit for your AccuFlo model micro-abrasive blaster.
To order a kit, contact Customer Service at 1-818-841-5500 or sales@comcoinc.com.
Recommended Replacement Parts for the AccuFlo
MB2247 Tune-Up Kit for the AccuFlo
This kit is for units with 1/4″ output fitting and AF serial numbers up to AF130. The kit includes one of each:
Part Number | Part Description |
MB1653 | PowderGate nose |
MB2560-2 | PowderGate output fitting |
ST5650-242 | O-ring |
MB2247-2 Tune-up Kit for the AccuFlo
Appropriate for units with 1/4″ output fitting and AF serial numbers from AF131. The kit includes one of each of the following:Part Number | Part Description |
MB1653 | PowderGate Nose |
MB2560-3 | PowderGate Output Fitting |
ST5650-242 | O-ring |
MB2247-3 Tune-Up Kit for the AccuFlo
This kit is for units with 3/8″ output fitting. The kit includes one of each:Part Number | Part Description |
MB1653 | PowderGate nose |
MB2560-4 | PowderGate output fitting |
ST5650-242 | O-ring |
Part Description | Part # |
---|---|
O-Ring (Included with Tune-up Kit) | ST5650-242 |
Quicknut | MB1483 |
Replacement Window | MB2230 |
Tank Assembly | MB2200-10 (Standard) MB2200-20 (Tall Tank) |
Tank Cover with Window | MB2220 |
Tank Orifice | MB1409-xx (xx= orifice size; -40 is most common.) |
Vent Fitting | ST4010-2 |
Part Description | Part # |
---|---|
Abrasive Blend Assembly | MB2270 |
Bypass Tube (See Bypass Tube Selection Table for specific part numbers) | MB2265-X |
Cover | MB2202-1 |
Footswitch | PF2414 |
Fuse, 220V, 5X20MM, (110V: 1A, Time Delay) (230V: 500mA, Time Delay) | ST2005-010 (115V) or ST2005-005 (230V) |
Gauge | MB2280-1 |
Modulator | MB2250-1 (115V) or MB2250-2 (230V) |
PCB Assembly | MB2231-1 (115V) or MB2231-2 (230V) |
PowderGate | MB2555 |
PowderGate Output Fitting (Included in Tune-up Kit) | MB2560-x |
PowderGate Nose (Seal) (Included in Tune-up Kit) | MB1653 |
Power Switch | ST2045-5 |
Regulator | MB2290-1 |
Valve Manifold | MB2210-1 |
Vent Pinch | MB2240 |
Part Description | Part # |
---|---|
ComfortGrip Handpiece Assembly | MB2599 |
Abrasive Hose, Blue, 1/4″ Diameter, 25ft Package | MB1233-25 |
Abrasive Hose, Blue, 1/4″ Diameter, 100ft Spool Regulator Assembly | MB1233-100 |
0.018", Violet, Round Hi/Performance Nozzle | MB2520-18 |
0.030″, Green, Round Hi/Performance Nozzle | MB2520-30 |
0.046", Yellow, Round Hi/Performance Nozzle | MB2520-46 |
0.060", Red, Round Hi/Performance Nozzle | MB2520-60 |
Don’t see your part on this list? Contact Customer Service at 1-818-841-5500 or sales@comcoinc.com.
Abrasive and Airstream Issues
How do I adjust the amount of abrasive in the air stream?
- Tank Orifice
- Bypass Tube
- Abrasive Blend Knob
All of the abrasive traveling from the mixing chamber and out to the nozzle must pass through the tank orifice; so this is the most important control point. The larger the orifice, the more abrasive in the air stream.
The bypass tube impacts the intensity that the modulator pulses have on the abrasive stream. It is easier for air to pass through the bypass tube to the top of the tank, where air dissipates. One of our large bypass tubes (size “C”) allows greater airflow, thereby reducing abrasive flow. Our small bypass tube (size “A”) creates a richer abrasive stream. Most applications need the midsize bypass tube, size “B”.
If you work with abrasives that clump often or do not flow easily; use a large tank orifice and a large bypass tube. The large tank orifice allows more abrasive into the mixing chamber, and the large bypass tube decreases the strength of the modulator pulse to keep the flow steady.
The next point of adjustment is the abrasive blend knob. See instructions in the next dropdown.
How far should I turn the Abrasive Blend Knob?
General Recommendation
Turn the abrasive blend knob clockwise until it tightens. Leave the knob at this point on the dial. This is the maximum position.
Every blaster is configured to a specification. This means the tank orifice, the nozzle, and the blast pressure have been carefully selected for the application. The abrasive blend valve should sit fully closed, which happens when the knob is in the max position. This allows the most amount of abrasive to flow through your blaster. The amount of abrasive in the air stream is ultimately determined by the tank orifice, where abrasive enters the air stream.
Yes, You Can Break It.
There are two ways to ‘break’ this feature on your blaster:
1. Over-tightening the knob: The knob is a multi-turn knob that can be turned up to 7 full revolutions. It has a hard stop at the max position, but the needle valve seals against an O-ring so there is slight give, allowing a good seal to be created. Forcing the knob past the max position with a pair of pliers does not increase the volume of abrasive. Bending the stem, stripping the threads, or breaking off the knob while trying to force it past this hard stop requires factory service to repair.
2. Turning the knob too far counterclockwise: This opens the valve and reduces the air flow through the modulator. Reducing the airflow decreases the strength of the modulator pulses. Abrasive may still appear in the air stream, but it is only there due to gravity and suction and eventually trickles off. Turning the knob too far counterclockwise results in a loss of time and productivity. The abrasive stream produced is usually so weak and irregular that it creates an uneven surface finish on the targeted part. Operators also tend to pump the footswitch to compensate for the weak abrasive flow, accelerating wear on the machine.
How to Manage this Feature
First, set the abrasive blend knob at the maximum position:
- If the knob feels tight when you attempt to turn it clockwise, stop! Do not over-tighten it. The knob is already in position. Leave it here.
- If the knob feels loose and easily turns in either direction, then it is not in the maximum position. Turn the knob clockwise up to 7 revolutions until it feels tight. Leave it here.
Then, make the following adjustments to your blaster as needed:
- For more abrasive in the air stream, change the tank orifice.
- For a lot less abrasive, change the tank orifice.
- For just a little less abrasive, turn the abrasive blend knob counterclockwise 1/2- 3 revolutions. No more.
Need a Calibration Cap?
If several operators alternate use of your blaster, and you see a difference in abrasive flow between users, then a calibration cap is a good idea. A calibration cap locks this knob into the maximum position and reduces variability operator to operator. Contact Customer Service at sales@comcocinc.com or 1-818-841-5500 to place an order.
If you need additional guidance, please contact our Technical Support at 1-818-841-5500 or tech@comcoinc.com.
Why isn’t abrasive flowing out of the nozzle, but air is?
Use the following chart to determine the problem:
Items to Check | Solution |
Is the powder tank empty? |
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Is the tank orifice plugged? |
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Is the abrasive in the tank damp and sticking to the walls? |
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Is moisture contaminating the powder? |
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Is the modulator functioning? |
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Are you using abrasive from a manufacturer than Comco? |
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If you are unable to resolve this or any issue, contact our Technical Support Team at 1-818-841-5500 or techsupport@comcoinc.com.
Why are neither air nor abrasive exiting the nozzle?
Use the following chart to determine the problem:
Items to Check | Solution |
Is the electrical power ON? |
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Does the pressure gauge indicate pressure in the system? |
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Is the inlet valve working properly? |
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Is the nozzle plugged? |
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Is there a problem with the abrasive line? |
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Is the tank pressurizing? |
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Is the modulator working properly? |
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Why is the abrasive hose wearing out so quickly?
- Verify that the appropriate abrasive hose is in use. We only recommend using our brand of abrasive hose with Comco equipment. If unsure, call our Customer Service at 1-818-841-5500.
- Verify that the hose from the output fitting to the pinch valve is not pulled too tight or bent. A sharp bend creates a wear point.
- Inspect the output fitting for wear. If worn, it can crush the abrasive hose, creating excessive wear. Replace the fitting if necessary.
- WARNING: Do not cut off sections of the hose that appear worn and use the seemingly good hose.
- If wear and holes are visible in one section of the hose, then the entire hose is probably near eruption. Replace the entire hose or risk turning your blaster into a snow globe.
- If wear and holes are visible in one section of the hose, then the entire hose is probably near eruption. Replace the entire hose or risk turning your blaster into a snow globe.
- Inspect the pinch valve assembly. Any sharp edges on the plunger or pinch tube causes the hose to wear faster.
Why do I see premature wear on my output fitting?
Are you using 3/8″ abrasive hose?
This larger abrasive hose requires a different type of connection than the QuickNut used on a standard 1/4″ hose. Proper installation for the larger hose fitting is critical. Installation requires 4 parts: the hose, the output fitting, a nut, and a 2-piece ferrule.
The 3/8″ abrasive hose must be pressed firmly into the output fitting prior to installation. Tighten the nut while holding the hose in place. The ferrule should crimp as the nut is tightened. Any gap between the hose and the output fitting creates turbulence in the abrasive stream and causes the fitting to fail along the side of the junction.
A poorly cut hose triggers quick wear. Check to see if the hose is cut raggedly or at an angle. The hose must have a straight, clean cut at its end.

2. INCORRECT: Cutting the abrasive hose at an angle will result in faster wear at the output fitting.

3. CORRECT: The hose end should be flat, straight and clean to fit securely in the fitting and reduce wear.
Don’t Just Cut the Worn Parts Off!
If the hose is already damaged or visibly worn in one spot, even at its end, replace the entire hose. The first noticeable sign of wear is a good indicator that the entire abrasive hose is thinning all over, even if you cannot see these worn points. Don’t just cut off the visibly worn area and use the remainder of the hose. You risk turning your workstation and your shop into a sudden snowglobe.
If you are unable to resolve this or any issue, contact our Technical Support Team at 1-818-841-5500 or techsupport@comcoinc.com.
Why is too much abrasive in my air stream?
What happens when my modulator wears out?
- Diminished media flow after the first 5-10 seconds of blasting is a great indicator that the modulator is wearing out. A rattling sound is also a strong indicator.
- It should hum. If it rattles, replace it.
Learn more at Understanding Modulator Wear and Repair.
How does oil contamination affect my blaster, and how do I know if oil is contaminating my blaster?
To quickly spot oil contamination:
- Look at the air line. New air lines running clean air are milky-white in color. Exposure to oil turns these lines orange or yellow.
- Unscrew the black plastic bonnet inside the regulator to check for oil pools. Oil tends to pool in the regulator assembly of the AccuFlo.
- Open the assembly to expose the filter element. If large clumps of abrasive are stuck to the filter element, oil is present in your blasting system.
Learn more on Oil Contamination and the Importance of Clean, Dry Air.
Air Pressure
Why won’t my machine pressurize properly?
Items to Check | Solution |
Is power getting to the unit? Does the light on the power switch illuminate? |
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Do you hear air escaping from the unit when it is turned on? |
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Why does my system have trouble maintaining consistent air pressure?
WARNING: The upper limit for air pressure is dictated by the house line pressure. There should be a 10 psi buffer between blast pressure and line pressure. Turning the regulator knob clockwise beyond the line pressure will not increase blast pressure and potentially damage the regulator diaphragm.
Use the following chart to determine the problem:
Items to Check | Solution |
Does your regulator hold the proper pressure? |
As the unit sits idle, does the pressure gradually creep up to line pressure, only to drop back down to the normal pressure once blasting begins?
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Does the regulator stay at the desired blast pressure when idle, only to drop significantly once blasting starts? |
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Does the regulator drop less than 5 psi, but the air flow out of the nozzle is still weak? |
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Nozzles
Why is a small amount of air leaking from the nozzle even though the blaster is not in use?
This leak signifies a worn nosepiece or worn output fitting. Follow these steps to determine which part is worn.
- Unscrew the output fitting from the side of the machine.
- Using a pair of needle-nose pliers, pull off the blue nosepiece (which will have grooves).
- Replace the blue nosepiece.
- Inspect the carbide seat on the output fitting for grooves.
- If it has grooves, too, then replace the output fitting as well.
Contact our Customer Service Specialists at 1-818-841-5500 or sales@comcoinc.com to order replacement parts or a Tune-up Kit.
How do I change my nozzle?

Instructions for replacing the AccuFlo nozzle on a ComfortGrip handpiece.
Can I use MicroBlaster nozzles on my AccuFlo?
Yes, but you need an adaptor. Contact our Customer Service Specialists at 1-818-841-5500 or sales@comcoinc.com to determine adaptations and order part #MB2331.
What size nozzles can I use with my AccuFlo?
- Standard AF nozzles range from .018-.060”.
- The AF is rated up to 7.5 SCFM.
- Remember, nozzle size + air pressure = air consumption. If using multiple nozzles, you may need to adjust your air pressure to keep it within the 7.5 SCFM range.
What range of nozzles are available?
Comco offers long-lasting Hi/Performance nozzles in addition to standard nozzles. Hi/Performance nozzles deliver an accelerated abrasive flow with a tighter focus, resulting in less overspray. The lifespan of these nozzles is 3-5x longer than most standard nozzles.
Why is my nozzle wearing out so quickly?
Items to Check | Solution |
Does the hose have a sharp bend? |
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Are you using rectangular nozzles? |
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Power
Why is my machine not getting power?
Check your fuses located above the power receptacle on the back of the machine. It may be time to replace them. If the fuses appear to be blown, contact Customer Service at 1-818-841-5500 or sales@comcoinc.com to place an order. The part number for the fuse (220V, 5x20mm, 1A time delay) is ST2005-010.
If the fuses appear to be working and connected but the machine is not getting power, contact Technical Support at 1-818-841-5500 or techsupport@comcoinc.com.
Tank Cover
How do I mend a crack in my tank cover?
Do not attempt to patch or repair a cracked tank cover.
The window may require immediate replacement. Call our Customer Service Specialist at 1-818-841-5500 or sales@comcoinc.com to order a new tank cover window (part #MB2217).