JKS 2700 User Manual
Page 8
JKS AC
OS Pro™ Installation
PN 2700
Page 8 of 8
7. INSTALL BUMP SHOCK ON
MAIN BODY OF ACOS PRO
Apply a drop of medium strength thread locking
compound to bottom few threads of
Main Body (B).
Completely thread the Bump Shock Adapter (H)
onto Main Body (B) until snug.
Apply anti-seize lubricant to threads of Bump
Shock Assembly (J). Completely thread the
Bump Shock Nut (I) onto Bump Shock
Assembly (J).
Completely thread the Bump Shock Assembly
(J) with Bump Shock Nut (I) into Bump Shock
Adapter (H) as far as possible.
8. RE-INSTALL REAR COIL SPRINGS
Re-install the rear coil springs per the factory
service manual instructions for your vehicle.
HINT: A coil spring compressor is useful for
installation.
Also re-install any of the components that were
removed during Step 1 of this installation.
ATTENTION INSTALLER
IMPORTANT NOTE REGARDING
SHOCK ABSORBERS
To prevent the coil springs from becoming
unseated during maximum suspension extension,
correct length shock absorbers must be installed.
9. ADJUST BUMP SHOCK POSITION
The ideal bump shock position is determined by the
vehicle suspension and varies for each application.
To properly set the bump shock position for
your vehicle, you must first decide the point at
which suspension compression should be
limited. Take into consideration coil springs,
shock absorbers, tire clearance, or any other
factors that cause the vehicle to bottom out.
IMPORTANT: Because it replaces the
original rubber bump stop, the bump shock
should determine the limit of compression
travel. The bump shock should be fully
compressed when the suspension reaches
maximum desired compression.
With the vehicle on level ground and the
suspension at full droop, extend the Bump
Shock Assembly (J) to the desired position.
Once the Bump Shock Assembly (J) is properly
adjusted for your application, lock in place by
turning the Bump Shock Nut (I) clockwise until it
contacts the Bump Shock Adapter (H).
IMPORTANT: The suspension must be fully
cycled to test for bump shock alignment and
interference issues before the vehicle can
be safely operated. The bump shock must
contact the center portion of the lower
spring pad at full compression, and there
should be no interference between the bump
shock and coil spring at full extension.
Interference issues may exist on
applications in which the rear axle has been
moved rearward to increase the vehicle’s
wheelbase. Resolving this problem may
require removal of the entire upper spring
mount from the chassis and re-welding it at
the correct angle.
If you encounter any interference issues,
contact JKS Manufacturing immediately for
technical assistance.
JKS Technical Department
Phone
877-533-7557
Operation
Ride Height & Bump Shock Adjustments
Future ride height and bump shock adjustments should
be made with NO LOAD on the rear coil springs, and the
suspension at FULL DROOP.
NEVER TURN Adjuster Ring (E) while under tension
and ALWAYS APPLY SPRAY LUBRICANT to threads
of Main Body (B) or Bump Shock Assembly (J) before
adjusting.
Bump Shock Pressure
The Bump Shock Assembly (J) is pre-charged with the
proper amount of Nitrogen gas to suit most applications.
IT SHOULD NOT BE NECESSARY TO ADJUST BUMP
SHOCK PRESSURE ON MOST VEHICLES.
The Nitrogen charge is factory preset at 150 psi. For
applications that require a higher or lower compression
rate, the gas pressure can be manually adjusted to a
minimum of 100 psi and a maximum of 200 psi.
To adjust pressure, the bump shock assembly must be
removed from the vehicle. Nitrogen pressure is adjusted
through the Schrader valve on top of the bump shock.
Care should be taken when discharging the bump shock
to ensure that no oil is lost. Most shops that service off-
road racing or motorcycle shock absorbers can adjust
bump shock pressure.
Maintenance
Regular cleaning with pressurized water is
recommended to maximize ease of operation and
reliability.
2009 JKS Manufacturing, Inc & Aftermarketing, LLC
Revision Date 3/6/2013