Idiomas disponibles
Idiomas disponibles
Reference Dimension Details for PR HCV
Prepare Vehicle For Installation
NOTE: Prior to installation, rotate control arm 3-5 times 360 degrees in both the intake and exhaust
directions to remove any adverse effects from storage.
1. Be sure that the suspension is centered between the frame rails before beginning installation. The
vehicle should be in an unloaded condition before starting installation procedures. Be certain all dump
switches are off. Park the vehicle making sure all vehicle wheels are on a hard, level surface. Raise and
properly support all auxiliary axles. DO NOT set the parking brakes. Instead use safety wheel chocks to
secure the vehicle.
WARNING: Failure to support auxiliary axles could allow axle to drop or the vehicle to roll resulting in
death or serious personal injury.
Installing the PR and PR Plus HCV
2. Determine the desired control arm position and valve orientation on the vehicle.
Fasten the control arm to the interface cap and shaft making sure the alignment identifier dimple on the
interface cap is in the proper position for your valve orientation. Refer to Fig. 3 & 4 for proper alignment
identifier orientation. Use the provided nylok nut and tighten to 25-30 in-lbs. DO NOT over torque this
nylok nut; it could result in a damaged or broken shaft. If adjustable control arm is used, assemble with
provided hardware. Torque the adjustment bolt to 25-30 in-lbs.
NOTE: Apply permanent thread locking compound on threaded shaft before tightening down the nylok nut.
3. If necessary, install fittings in HCV before mounting to the vehicle. Haldex recommends fittings with
pre-applied seal compound. If recommended fittings are not available use a drop of oil or thread-locker.
Use small amounts of sealant on threads only. DO NOT use Teflon tape or pipe sealing compound.
4. Mount the PR & PR Plus HCV on the frame rail or a bracket and torque mounting nuts to 35-45 in-lbs.
Hexagonal head fasteners can be used to mount the PR HCV. Integrated fasteners are already installed
in the PR Plus HCV. For proper mounting bolt spacing see Fig. 1 & 2. The PR & PR Plus valves should be
mounted as level as possible. A small torpedo level or mason's line level can help in this positioning.
5. a) Connect the air line from the air springs to the delivery (DEL) port(s) on the valve.
b) Connect the air line from the air supply tank to the supply (SUP) port on the valve.
c) Charge the air supply system.
NOTE: Supply port for PR HCV is the port closest to the mounting holes on the valve.
Figure 2
Verify System Operation
6. Confirm the control arm is properly installed by raising the control arm approximately 20° above
horizontal. Air pressure should inflate the air springs. If the air springs do not inflate:
a) Verify the air supply pressure is sufficient enough to open the pressure protection valve (usually
greater than 85 psi).
b) Recheck the air lines for proper
port connection.
c) Make sure that any suspension
dump/exhausting feature is not
activated.
d) Determine if the control arm and
alignment identifier dimple on
the interface cap are in the proper
orientation. Refer to Fig. 3 & 4.
If air system still fails to inflate air
springs contact Haldex Technical Svc.
If the PR or PR Plus HCV properly
inflates the air springs, rotate the
control arm down approximately 20°
below horizontal. During normal
operation the air is exhausted from
under the interface cap as shown in
Fig. 6. Verify air is flowing from under the interface cap and the air springs are deflating.
PR Control Arm Orientation
PR Plus Control Arm Orientation
Figure 3
Figure 4
