Services > Equipment Repair > Proportioners

Troubleshooting Spray Guns

Spray Foam Equipment

To get start first select your spray gun:

As always with any troubles that you can't find the answer to here in our Troubleshooting Section be sure to give our tech department a call at 216-280-4180 or 1-877-CPi-1400 to get the answer to any troubles you might be having.

• My gun does not fully actuate when triggered.
  • Safety lock engaged, disengage safety lock (see page 10)
  • Plugged Muffler, clean (see page 20)
  • Damaged air valve o-rings, replace (see page 33)
• There is no fluid spraying when the gun is fully actuated.
  • Closed fluid valves; open
  • Plugged impingement ports; clean (see page 21)
  • Plugged check valves; clean (see page 31)
• My gun is actuating slowly
  • Plugged muffler; clean (see page 20)
  • Damaged piston o-rings; replace (see page 32)
  • Dirty air valve, or damaged o-rings; clean air valve or replace o-rings (see page 33)
• There is a leakage between my flat tip and my mixing chamber.
  • Tip is not seated properly; reassemble (see page 18)
  • Damaged or missing o-ring; replace (see page 18)
• There is a pressure imbalance
  • Plugged impingement ports; clean (see page 21)
  • Plugged check valves; clean (see page 31)
  • Viscosities are not equal; adjust temperature to compensate
• There is A and/or B side fluid in the gun air section
  • Damaged side seals; replace (see page 29)
  • Damaged mixing chamber; replace (see page 29)
  • Damaged side seal o-rings; replace (see page 29)
  • Tightened air cap with fluid valves open; close valves first
• There is a mist of fluid from the mixing chamber or air cap
  • Damaged side seals; replace (see page 29)
  • Damaged mixing chamber; replace (see page 29)
  • Damaged side seal o-rings; replace (see page 29)
• I am experiencing a rapid build up of material on the air cap
  • Plugged air cap holes; clean (see page 20)
  • Too little cleanoff air; increase(see page 13)
  • Damaged/missing fluid housing o-ring; replace (see page 29)
• Excessive cleanoff air when fluid valves are closed and gun is triggered.
  • Damaged or missing fluid housing o-ring; replace (see page 29)
• The fluid does not shut off when fluid valves are closed
  • Damaged fluid valves; replace
• Cannot tighten retaining ring until it bottoms out
  • Air cap assembled before retaining ring; install retaining ring first, then air cap (see page 30)

• My gun does not actuate when triggered.
  • Air switch assembly is closed (see page 10)
  • Plugged exhaust, clean air ports in handle
  • Damaged trigger spool o-rings, replace
• There is no fluid spraying when the gun is fully actuated.
  • Closed fluid valves; clean page 10
  • Plugged impingement ports; clean
  • Plugged check valves; clean
• My gun is actuating slowly
  • Plugged exhaust; clean air ports in handle (see page 20)
  • Damaged piston o-rings; replace
  • Dirty air valve, or damaged o-rings; clean air valve or replace o-rings
• There is a leakage between my flat tip and my mixing chamber.
  • Tip is not seated properly; reassemble
  • Damaged or missing seal; replace (see page 19)
• There is a pressure imbalance
  • Plugged impingement ports; clean (see page 10)
  • Plugged check valves; clean
  • Viscosities are not equal; adjust temperature to compensate
• There is A and/or B side fluid in the gun air section
  • Damaged side seals; replace
  • Damaged mixing chamber; replace
  • Damaged side seal o-rings; replace
  • Tightened air cap with fluid valves open; close valves first
• There is a mist of fluid from the mixing chamber or air cap
  • Damaged side seals; replace
  • Damaged mixing chamber; replace
  • Damaged side seal o-rings; replace
• The fluid does not shut off when fluid valves are closed
  • Damaged fluid valves; replace
• There is a burst of air from the muffler when the gun is triggered
  • Normal; no action required
• There is a steady air leakage from the muffler
  • Damaged air valve o-rings; replace
  • Damaged pistion o-rings; replace

• My gun does not actuate when triggered.
  • Plugged air passages, clean
  • Damaged trigger valve o-rings, replace see page 26)
• There is no fluid spraying when the gun is fully actuated.
  • Closed fluid valves; open
  • Plugged mix module; clean
  • Plugged check valves; clean
• My gun is actuating slowly
  • Plugged muffler air passage; clean
  • Damaged piston o-rings; replace
  • Dirty trigger valve, or damaged o-rings; clean air valve or replace o-rings see page 26)
• There is a leakage between my flat tip and my mixing chamber.
  • Tip is not seated properly; reassemble
  • Damaged or missing seal; replace
• There is a pressure imbalance
  • Plugged mix module; clean
  • Plugged check valves; clean
  • Viscosities are not equal; adjust temperature to compensate
• There is a mist of fluid from the mixing module
  • Damaged mix module; replace
  • Damaged impingment rod; replace
  • Mix module not sealed properly; replace see page 28)
• The fluid does not shut off when fluid valves are closed
  • Damaged fluid valves; replace

• My gun does not fully actuate when triggered.
  • Plugged air passages, clean (see page 23-24)
  • Damaged valve spool rings, replace (see page 22)
• There is no fluid spraying when the gun is fully actuated.
  • Closed fluid valves; open
  • Plugged impingement ports; clean
  • Plugged check valves; clean
• My gun is actuating slowly
  • Plugged air passages; clean (see page 23-24)
  • Damaged piston o-rings; replace (see page 17)
  • Dirty valve spool, or damaged o-rings; clean air valve or replace o-rings (see page 22)
• There is a leakage between my flat tip and my mixing chamber.
  • Tip is not seated properly; reassemble
  • Damaged or missing seal; replace
• There is a pressure imbalance
  • Plugged impingement ports; clean
  • Plugged check valves; clean
  • Viscosities are not equal; adjust temperature to compensate
• There is A and/or B side fluid in the gun air section
  • Damaged side seals; replace
  • Damaged mixing chamber; replace
  • Damaged side seal o-rings; replace
• There is a mist of fluid from the mixing chamber
  • Damaged side seals; replace
  • Damaged mixing chamber; replace
  • Damaged side seal o-rings; replace
• The fluid does not shut off when fluid valves are closed
  • Damaged fluid valves; replace

• My gun does not actuate when triggered.
  • Plugged ports in handle, clean (see page 4)
  • Damaged air valve o-rings, replace
• There is no fluid spraying when the gun is fully actuated.
  • Closed fluid valves; clean
  • Plugged impingement ports; clean
  • Plugged check valves; clean
• My gun is actuating slowly
  • Plugged air ports in handle; clean (see page 4)
  • Damaged piston o-rings; replace
  • Dirty air valve, or damaged o-rings; clean air valve or replace o-rings
• There is a leakage between my flat tip and my mixing chamber.
  • Tip is not seated properly; reassemble
  • Damaged or missing flat nozzle seal; replace
• There is a pressure imbalance
  • Plugged impingement ports; clean
  • Plugged check valves; clean
  • Viscosities are not equal; adjust temperature to compensate
• There is A and/or B side fluid in the gun air section
  • Damaged side seals; replace
  • Damaged mixing chamber; replace
  • Damaged side seal o-rings; replace
• There is a mist of fluid from the mixing chamber
  • Damaged side seals; replace
  • Damaged mixing chamber; replace
  • Damaged side seal o-rings; replace