MN-604 (01412) NPR 4732 by Kit No. 59554 www.airliftcompany.
Tools Needed Hose Cutter, Razor Blade, or Sharp Knife Hoist or Floor Jacks Safety Stands Safety Glasses Air Compressor, or Compressed Air Source Spray Bottle with Dish Soap/Water Solution 1 /2 ", 9/16 ", and 3/4 " open-end or box wrenches Crescent Wrench Ratchet with 3/8 ", 9/16 " and 1/2 " deep well sockets 5 /16 " and 3/8 " drill bits (very sharp) Heavy Duty Drill Torque Wrench IMPORTANT: Your vehicle may be equipped with a rear brake proportioning valve.
II. Assembling the Air Spring Unit 1. Install the air fitting (J) to the top of the air sleeve (A). Tighten 1 and 1/2 turns (Figure 1). 2. Attach the lower bracket (C) to the bottom of the air sleeve (A) using the small flat head screw (H). Tighten securely (Figure 1). 3. Install the upper bracket (B) onto the top of the air sleeve, being sure to insert the air fitting through the hole on the bracket (Figure 1). 4.
10. IMPORTANT: Be sure to cover the air fitting with piece of tape to prevent metal shavings from getting into the fitting or sleeve. 11. Check alignment, adjust if needed, then center punch and drill two more holes in the upper bracket. 12. Tighten the upper bracket mounting bolts (Figure 1). Do not overtighten. 13. Drill a 3/8” hole through both sections of the frame.
IV. Installing the Air Lines 1. Choose a convenient location for mounting the inflation valves. Popular locations for the inflation valve are: a. The wheel well flanges. b. License plate recess in bumper. c. Under the gas cap access door. d. Through license plate itself. NOTE: What ever the chosen location is, make sure there is enough clearance around the inflation valves for an air chuck. 5 Figure 5 Good cut – clean and square Bad cut – flattened 2. Drill a /16 " hole to install the inflation valves.
V. Finishing the Installation 1. With the air line in the fitting, inflate to 10 p.s.i., adjust the sleeve in or out for alignment, and secure air sleeve to upper bracket by tightening the nylon nut to 4 ft-lbs (Figure 1). Do not overtighten. 2. Repeat entire installation procedures for the remaining side. 3. After both sides are complete, continue by reading Sections VI through X.
VI. Maintenance and Operations Minimum Air Pressure Maximum Air Pressure 10 p.s.i. 100 p.s.i. Failure to maintain correct minimum pressure (or pressure proportional to load), bottoming out, over-extension, or rubbing against another component will void the warranty. By following these steps, vehicle owners will obtain the longest life and best results from their air springs. 1. Check the air pressure weekly. 2. Always maintain Normal Ride Height. Never inflate beyond 100 p.s.i. 3.
Product Use Information Frequently asked questions Q. Will installing air springs increase the weight ratings of a vehicle? No. Adding air springs will not change the weight ratings (GAWR, GCWR and/or GVWR) of a vehicle. Exceeding the GVWR is dangerous and voids the Air Lift warranty. Q. Is it necessary to keep air in the air springs at all time and how much pressure will they need? The minimum air pressure should be maintained at all times.
Continued from pg. 1 Guidelines for adding air: 1. Start with the vehicle level or slightly above. 2. When in doubt, always add air. 3. For motorhomes, start with 50-100 PSI in the rear because it can be safely assumed that it is heavily loaded. 4. If the front of the vehicle dives while braking, increase the pressure in the front air bags, if equipped. 5. If it is ever suspected that the air bags have bottomed out, increase the pressure (fig. 4). 6. Adjust the pressure up and down to find the best ride.
