Below are the instructions for creating a new vent in your 7303LX Air Hog™ vacuum booster, and redirecting vacuum exhaust through it. This procedure is to prevent the automatic pump-out from overheating and shutting down due to the vacuum exhausting insufficiently. Disconnect power before working on your machine!


Parts needed:

  • 18" wire-reinforced vacuum hose - PH628
  • Hose cuff - H544


Tools needed:

  • 2 1/2" hole saw
  • Flathead screwdriver 
  • 3/8" socket wrench

Step 1: Open up the machine.


Use the latch on the rear of the machine to open it. Rest the recovery tank on something so the hoses have some slack.


Step 2: Remove the base vacuum from the standoff pegs.


Remove the hose from the vacuum inlet by loosening the hose clamp with a flathead screwdriver. Use a 3/8" socket to remove the bolts holding the vacuum onto the standoff pegs.


Step 3: Remove the rubber boot from the vacuum horn.


Loosen the hose clamp to remove the rubber boot. Discard the boot but keep the hose clamp.


Step 4: Place the vacuum back on the standoff pegs with the horn pointing toward the rear right corner of the machine. 


The vacuum should be rotated 120º counter-clockwise from its original position, like in the picture above.


Step 5: Bolt the vacuum back down onto the standoff pegs.


Use the original bolts and a 3/8" socket.


Step 6: Connect plumbing to the vacuum.


Use a hose clamp and flathead screwdriver to connect the 18" length of hose to the vacuum horn and direct the other end of the hose toward the front of the machine. Re-connect the hose from the recovery tank to the vacuum inlet.


Step 7: Drill a 2 1/2" hole in the front of the machine.


Drill the hose in the location shown in the picture above.


Step 8: Feed the exhaust hose through the hole on the front of the machine and twist on the hose cuff.


Close the machine back up after you are finished.