Network Computing Devices Automobile Parts 2172 User Manual

2172  
DO NOT INSTALL THIS KIT ON VEHICLES WITH  
COMPOSITE LEAF SPRINGS. THIS KIT IS COMPATIBLE  
WITH STEEL LEAF SPRINGS ONLY.  
WARNING:  
Do not inflate this assembly when it is  
unrestricted. The assembly must be restricted  
by the suspension or other adequate structure.  
Do not inflate beyond 100 psi Improper use or  
over inflation may cause property damage or  
severe personal injury.  
Installation of this kit requires a  
minimum of 6-1/2" of clearance between  
the tire side wall and the frame.  
Your kit includes separate inflation valves and air lines  
for each air helper spring. This will allow you to level your  
vehicle from side to side as well as from front to back. If you  
would rather have a single valve inflation system, your  
dealer can supply the required "T" fitting.  
INSTALLATION INSTRUCTIONS  
Congratulations-yournewAirHelperSpringsarequality  
products capable of improving the handling and comfort of  
your vehicle. As with all products, proper installation is the  
key to obtaining all of the benefits your kit is capable of  
delivering. Please take a few minutes to read through the  
instructions to identify the components and learn where and  
how they are used. It is a good idea to start by comparing the  
parts in your kit with the parts list below.  
IMPORTANT!  
For your safety and to prevent possible damage to your  
vehicle, do not exceed the maximum load recommended by  
the vehicle manufacturer (GVWR). Although your Air Helper  
Springs are rated at a maximum inflation pressure of 100  
psi, this pressure may allow you to carry too great a load on  
some vehicles. It is best to have your vehicle weighed once  
it is completely loaded and compare that weight to the  
maximum allowed. Check your vehicle owner’s manual for  
maximum loads listed for your vehicle.  
The heart of the air helper spring kit is, of course, the air  
springs. Remember that the air helper springs must flex and  
expand during operation, so be sure that there is enough  
clearance to do so without rubbing against any other part of  
the vehicle.  
Besuretotakeallapplicablesafetyprecautionsduringthe  
installation of the kit. The instructions listed in this brochure  
and the illustrations all show the left, or driver’s side of the  
vehicle. To install the right side assembly simply follow the  
same procedures.  
When inflating your Air Helper Springs, add air pres-  
sure in small quantities, checking pressure frequently dur-  
ing inflation. The air spring requires much less air volume  
than a tire and, therefore, inflates much quicker.  
TOOLS REQUIRED  
• (2) 9/16" END WRENCHES  
• (2) 1/2" END WRENCHES  
• UTILITY KNIFE  
• 5/16" DRILL BIT  
• 3/8" DRILL BIT  
• ELECTRIC DRILL  
PARTS LIST  
AIR SPRING  
UPPER BRACKET  
LOWERBRACKET  
BRACKET STRAP/SHIM 1/2" 5086  
BRACKET STRAP/SHIM 1"  
AIR LINE TUBING  
9001  
5376  
5092  
2
2
2
4
4
1
16  
6
8
6
2
3/8"-16 X 1 1/2 HEX BOLT  
5/16" FLAT WASHER  
PUSH-TO-CONNECT  
INFLATION VALVE  
INFLATION VALVE CAP  
PUSH-TO-CONNECT  
ELBOWFITTING  
THERMAL SLEEVE  
NYLON TIE  
CAUTIONTAG  
8
4
2
2
5093  
3/8"-16FLANGELOCKNUT  
2
2
6
2
3/8"-16 X 3/4" FLANGE HEX BOLT  
3/8"-16 x 4-1/2" CARRIAGE BOLT  
3/8" SPECIAL WASHER  
3/8" FLAT WASHER  
21-8136  
09-07  
NCD-6029-3  
 
STEP 1 - PREPARE THE VEHICLE  
Remove the positive battery cable. With the vehicle on a solid, level surface  
chockthefrontwheels. Raisethevehiclebytheaxleandremovetherearwheels.  
After the removal of the wheels lower the vehicle so the axle rests on jack stands  
rated for your vehicles weight. This installation assumes that there is no load in  
the bed of the truck.  
STEP 2 - PRE-ASSEMBLE THE KIT  
Select one air helper spring and an upper bracket from your kit. Before  
attaching the air spring to the upper bracket, thread the air fitting into the spring  
see Figure "A". Tighten the air fitting so as to make contact with the nylon ring  
and then tighten 1/4 turn to snug the fitting. No thread sealant is needed. Align  
thethreadedmountingholesoftheairspringwiththemountingholesoftheupper  
bracket and attach the upper bracket using the 3/8" -16 x 3/4" flanged hex bolts.  
Select one lower bracket and place the bracket so the lip of the lower bracket will  
be next to the tire see Figure "A". Fasten using a 3/8"-16 x 3/4" flange lock bolt  
through the center slot into the threaded hole in the air spring (finger tight). Note  
that this bolt will be tightened in Step 4.  
FRONT  
DRIVER'S SIDE  
FIGURE "B"  
STEP 3 - PRE-FIT AND MARK / DRILL HOLES  
FRONT  
Position the air spring assembly on the leaf spring stack. The lower bracket  
should straddle the leaf spring retainer and the upper bracket mounting flanges  
should be flush against the frame. Depending on the application, the lower bracket  
mayhavetoberaised(i.e.interferencewith"U"-bolts,leafspringretainer,brakedrum,  
etc...). This kit comes with two sets of bracket straps/shims. These are included to  
provideadequateclearancefortheairspringandlowerbracket,aswellas,anyother  
component on the vehicle. One set is 1/2" tall while the other set is about 1" tall. To  
raisetheairspringassemblytoitsmaximumheight,installthe1/2"shimbetween  
the lower bracket and the leaf spring stack. The remaining 1" strap/shim will be  
used to clamp the assembly to the leaf spring stack see Figure "C". The bracket  
straps/shims may be interchanged to provide maximum clearance and proper air  
spring height. Furthermore, the shims can be mixed (i.e. use the 1/2" on one side  
and the 1" or none on the other) to adjust for leaf spring slant. Keep the upper  
and lower brackets as parallel as possible.  
FIGURE "C"  
Once the height of the lower bracket has been established, adjust the position  
of the upper bracket so that the mounting flanges are flush with the side of the  
frame rail. Itmaybenecessarytoslidetheentireassemblyforeoraft along the leaf  
springinordertoprovidepropermounting. Beforemarkinganddrillingtheholes  
for the upper bracket, make sure the mounted height of the air spring is between  
7-1/4" - 8-1/2" see Figure "C", and the upper and lower brackets are as parallel  
and high as possible. Mark the four holes to be drilled with a center punch using  
the upper bracket as a template, then remove the air spring assembly. Before  
drilling the holes make sure all electrical, brake and fuel lines are cleared from  
the path of the drill. Damage to lines can be avoided by inserting a piece of wood  
between the frame rail and any lines in the path of the drill. Drill the four holes in  
the frame rail using a 3/8" drill bit see Figure "A".  
AIR  
SPRINGS  
AIR HOSE  
INFLATION  
VALVES  
BUMPER  
FIGURE "D"  
STEP 4 - INSTALL THE ASSEMBLY TO THE VEHICLE  
AIR LINE  
After drilling the holes in the frame rail place the assembled air spring and  
brackets back on the leaf stack making sure the lower bracket is placed over the  
retainer(seeFigure"A"&"B"). Installthe3/8"-16x1-1/2"hexboltsthroughthe  
upper bracket holes and the holes that were drilled in the frame rail. Next, fasten  
the upper bracket to the frame rail using the 3/8"-16 flange lock nuts and flat  
washers see Figure "A". On each side of the vehicle, substitute a standard  
washer in place of the special washer in the upper rear location see Figure "A".  
Next, attach the lower bracket to the leaf spring assembly. Use the bracket strap/  
shim that is not being used as a spacer and fasten the air spring assembly to the  
leaf stack using the 3/8"-16 x 4-1/2" carriage bolts and 3/8"-16 flanged lock nuts  
see Figure "A". Tighten the air spring to the lower bracket making sure the air  
spring is as vertical as possible.  
FLAT WASHER  
PUSH-TO-CONNECT  
INFLATION VALVE  
BODY OF  
VEHICLE  
HEX NUT  
VALVE CAP  
FIGURE "E"  
 
STEP 5 - INSTALLATION OF THE PASSENGER'S SIDE ASSEMBLY  
Reverse any orientations when assembling and installing the right, or passenger side of the vehicle.  
STEP 6 - INSTALL THE AIR LINE AND THE INFLATION VALVE  
Uncoil the air line tubing and cut it into two equal lengths. DO NOT FOLD OR KINK THE TUBING. Try to make the cut as  
square as possible. Insert one end of the tubing into the elbow fitting installed in the top of the air helper spring. Push the tubing  
into the fitting as far as possible see Figure "A".  
Select a location on the vehicle for the air inflation valves. The location can be on the bumper or the body of the vehicle, as  
long as it is in a protected location so the valve will not be damaged, but maintain accessibility for the air chuck see Figure "D".  
Drill a 5/16" hole and install the air inflation valve using two 5/16" flat washers per valve as supports see Figure "E". Run the  
tubingfromtheairhelperspringtotheinflationvalve,routingittoavoiddirectheatfromtheengine,exhaustpipe,andawayfrom  
sharp edges. Thermal sleeves have been provided for these conditions. If a thermal sleeve is required simply slide the sleeve  
over the air line tubing to the location requiring protection. The air line tubing should not be bent or curved sharply as it may  
buckle. Secure the tubing in place with the nylon ties provided. Push the end of the air line tubing into the inflation valve as  
illustrated see Figure "E".  
STEP 7 - CHECK THE AIR SYSTEM  
Once the inflation valves are installed inflate the air helper springs to 70 psi and check the fittings for air leaks with an  
applied solution of soap and water. If a leak is detected at a tubing connection then check to make sure that the tube is cut as  
square as possible and that it is pushed completely into the fitting. The tubing can easily be removed from the fittings by first  
releasing the air pressure then push the collar towards the body of the fitting and then pulling out the tube. If a leak is detected  
where the fitting screws into the spring, remove the tubing by pushing the collar towards the body of the fitting and then pulling  
out the tube, then screw the brass fitting into the air spring or until the leak stops. Re-install the tubing and reinflate the air  
springs and check for leaks as noted above.  
This now completes the installation. Install the wheels and torque the lug nuts to the manufactures specifications. Raise the  
vehicle by the rear axle and remove the jack stands and lower the vehicle back onto the ground. Re-attach the positive battery  
cable and remove the wheel chocks from the wheels. Before proceeding, check once again to be sure you have proper clearance  
aroundtheairsprings. Withaloadonyourvehicleandtheairhelperspringsinflated,youmusthaveatleast1/2"clearancearound  
the air springs. As a general rule, the air helper springs will support approximately 25 lbs. of load for each psi of inflation  
pressure (per pair). For example, 50 psi of inflation pressure will support a load of 1250 lbs. per pair of air helper springs.  
FOR BEST RIDE use only enough air pressure in the air helper springs to level the vehicle when viewed from the side (front  
to rear). This amount will vary depending on the load, location of load, condition of existing suspension and personal  
preference.  
NOTE:  
Too much air pressure in the air helper springs will result in a firmer ride, while too little air pressure will allow the airhelper  
spring to bottom out over rough conditions. Too little air pressure will also not provide the improvement in handling that is  
possible. TO PREVENT POSSIBLE DAMAGE MAINTAIN A MINIMUM OF 10 psi IN THE AIR HELPER SPRINGS AT  
ALL TIMES.  
NOTE:  
Once the air helper springs are installed, it is recommended that the vehicle not be lifted by the frame, as over-extension  
may occur, resulting in damage to the air helper springs. However, should it become necessary to raise the vehicle by the  
frame, deflate both air helper springs completely.  
NOTE:  
MIN PRESSURE  
5 PSI  
MAX PRESSURE (LOADED) 100 PSI  
 

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