TECHNICAL
PROCEDURE
HCV witH integral Dump,
aftermarket kit VS-228
SuBJeCt:
Replacement Procedure
lit nO:
L1115
Date:
May 2015
reViSiOn:
A
Follow this procedure to replace an integral dump
height control valve (HCV):
1. Chock the vehicle’s wheels. Disconnect the linkage
from the control arm on the old (existing) valve.
2. Purge the air in the vehicle’s reservoir and
suspension system.
CautiOn: although the suspension has been
exhausted, the air lines could still
be under pressure and may propel
debris when disconnected. wear eye
protection when performing the next
step.
3. Disconnect all air lines from the old valve.
Remove the old valve.
4. Compare the length of the control arm on the old
valve with that of the new valve. If the old valve
had a short control arm, make the new valve
similar by breaking the control arm at the scored
line.
nOte:
Never remove the control arm from the valve
body, as this will void the warranty.
5. If necessary, replace any worn or bent hardware
(i.e., mounting brackets, nuts, bolts, linkage,
etc.).
6. Install the new valve in the same location as the
old valve. Use the new locknuts included in this
kit.
nOte:
Some applications require the installation
of the symmetrical spacer bracket that is
included in this kit. If your application requires
the spacer bracket, tighten the valve mounting
locknuts only finger tight at this time. This will
allow you to make fine adjustments in ride
height (by slightly rotating the valve body)
after the valve is plumbed and the control arm
linkage is re-attached.
7. Connect the air lines to the new valve (refer to
the plumbing diagram on the back page). New
air line fittings are preferable, however the old
ones can be reused. If necessary, the hex reducer
bushings included in this kit can be used to
adapt
1
/
8
inch air line fittings to the valve’s ¼ inch
ports. If using only one suspension port, plug the
unused port with the ¼ inch NPT plug included in
the kit. Make sure all connections are leak proof.
Use thread sealant on all fitting threads unless it
is already pre-applied.
DO nOt
use Teflon
®
tape
on the fitting threads; it could contaminate the air
system.
8. Connect the barbed tube fitting to the valve’s
exhaust port. Connect the four-inch tube to this
exhaust fitting.
9. Inflate the suspension and adjust it to the
manufacturer’s recommended ride height. Push
the control arm up to raise (add air to) the
suspension or down to lower (remove air from)
the suspension.
nOte:
Make sure that reservoir pressure is at a
minimum of 90 psi. This ensures adequate
pressure to open the pressure protection valve
(PPV).
10. With the suspension at the proper ride height, lock
the control arm in the neutral position by inserting
the wooden centering pin through the control arm
and into the hole in the valve body.
11. Connect the linkage to the control arm. Ensure the
link rotates freely on the control arm fastener and
does not bind (
the linkage should be vertical
when viewed from the front of the suspension
).
The linkage must hold the control arm in the
neutral position when the suspension is at the
designed ride height. If necessary, adjust the
linkage length. Minor adjustments in ride height
can be made by loosening the valve mounting
fasteners and rotating the valve body slightly.
12. Tighten the valve mounting locknuts and remove
the wooden centering pin.
