Troubleshooting Transfer Pumps

Spray Foam Equipment

Troubleshooting Guide:

• The is failing to operate.
  • Dirty or worn air motor; clean and service
  • Inadequate air supply or restricted lines; clean the lines or increase the air supply
  • Closed or clogged air valves; open or clear the valves
  • Clogged fluid hose or valve; clear the hoses and/or valves
  • Worn or damaged valves or seals; service
• The pump is operating, but the output is low on both strokes
  • Clogged fluid hose or valve; clear the hose or valve
  • Exhausted fluid supply; refill the fluid supply and reprime the pump
  • Worn or damaged valves or seals; service
• The pump is operating, but the output is low on the downstroke
  • Held open or worn intake valve; either clear or service the valve
  • Worn or damaged valves or seals; service
• The pump is operating, but the output is low on the upstroke
  • Held open or worn piston valve; either clear or service the valve
  • Worn or damaged valves or seals; service
• Erractic or accelerated operation
  • Exhausted fluid supply; refill the fluid supply and reprime the pump
  • Broken air motor compression spring; replace
• Pump slowly moves after shutoff in downstroke
  • Clogged or dirty intake valve check ball; clean the ball and seat
  • Worn or damaged valves or seals; install a repair kit
• Pump slowly moves after shutoff in upstroke
  • Clogged or dirty intake valve check ball; clean the ball and seat
  • Worn or damaged valves or seals; install a repair kit

• Pump does not move
  • Air motor stalled; close the needle valve and bleed down air pressure to the motor, if possible move the piston rod manaully a short distance and then close the bleed valve and slowly open the air needle valve to the air motor
  • Springs are damaged; replace
  • Low air supply; increase air supply with air regulator/open air needle valve/close bleed valve
  • Fluid outlet is blocked; check downstream hoses or check for closed valves
• Air leaks along piston shaft
  • Worn packing; replace
• Air leaks from piston shaft holes
  • Contamination by debris in air motor piston; check and service
• Slow air motor operations
  • Icing of the air motor; allow the build-up to thaw
  • Clogged muffler; clean or replace
• Low output on both strokes
  • Restricted hose access; clean, clear or replace
  • Bad fluid seals foot valve or piston cup; replace
• Low output on the upstroke
  • Bad or damaged piston cup; replace
• Low output on the downstroke
  • Bad or damaged foot valve or ball; replace
• Leaking fluid through packing at the air motor
  • Packings damaged or not seated properly; replace or set the packings
  • Packing nut too loose; tightening down the nut
  • Scored or scratched displacement rod; replace
• Abnormal or rapid operation
  • Low or no fluid supply; replenish fluid supply and reprime the cup
  • Broken spring in air motor; replace
• Jerky movement of the pump
  • Packing nut too tight; stop the pump operation, relieve fluid with the drain valve and loosen packing then retightening it

• Pump does not operate
  • Air supply or pressure is inadequate or the air lines are restricted; increase air pressure and check for any restrictions in the air line
  • Dispensing valve is not open or it is clogged; open and/or clear valve
  • Clogged fluid lines, valves, hoses, etc; follow the pressure relief procedure to clear obstruction
  • Damaged air motor; service the air motor
  • Depleted or exhausted fluid supply; refill fluid and prime the system or flush it
• Non-stop air exhaust
  • Worn or damaged air motor, gasket, packing, seal, etc; service the air motor
• Erratic pump operation
  • Intake valve or packings are worn; refill the fluid and prime the system
  • Intake valve is not completely closed; clear the obstruction and service the pump
• Low output on the upstroke
  • Clogged or worn piston valve; clear the obstruciton and service
• Low output on the downstroke
  • Clogged or worn intake valve; clear the obstruction and service
• Low output on both strokes
  • Restriction in air lines or pressure is too low; increase the air pressure or supply
  • Closed or clogged valves; open or clear the valve
  • Fluid supply is insufficient or exhausted; refill fluid and prime the sytstem
  • Obstructions in fluid lines, hoses, valves, etc; follow the relief procedure to clear the obstruction