Traxxas 6907 Owner's Manual page 18

Important: The shocks are
assembled at the factory
with a center-to-center
distance (between the rod
end balls) of 48mm. Any time
the shocks are removed and
disassembled, this distance
should be checked to ensure
proper operation of the
suspension.
48mm
18 • TRAXXAS
TUNING ADJUSTMENTS
Adjusting the Wheelie Bar
The model's wheelie bar can be set very precisely to ensure
proper weight transfer for maximum traction. To raise or lower the
height of the wheelie bar, use the supplied 4mm wrench to turn
the turnbuckle. If you are holding the rear of the car toward you,
turning the turnbuckle counterclockwise will lower the wheelie bar
(resulting in lower wheelies), and turning it clockwise will raise the
wheelie bar (to allow higher wheelies). Experiment to see which
setting gives the best weight transfer and performance.
SHOCKS
The 4 oil-filled shocks (dampers) effectively
control the suspension movement by
preventing the wheels and tires from
continuing to "bounce" after rebounding
from a bump. Changing the oil in the shocks
can vary the suspension damping effect.
Changing the oil to a higher viscosity oil will
increase damping. Lowering the viscosity of
the oil will cause the suspension damping to
be reduced. Damping should be increased (with higher viscosity oil)
if the model is bottoming out easily. Damping should be decreased
(with thinner viscosity oil) if the model is hopping over small bumps
and feels unstable. The viscosity of shock oil is affected by extremes
in operating temperature; an oil of certain viscosity will become
less viscous at higher temperatures and more viscous at lower
temperatures. Operating in regions with cold temperatures may
require lower viscosity oil. Your model's shocks are filled with 60
weight oil in the front and 40 weight oil in the rear. Only use 100%
silicone oil in the shock.
Removing the Front Shocks
To gain access to the front shocks, follow these steps. Refer to
the exploded views in the included Service and Support Guide
for reference:
1. Gently flex the suspension arms to free the shocks' caps from the arms.
2. Using the 2.0mm hex driver included with your model, remove
the screw that secures the lower shock mount.
3. Lift the shocks out of the chassis.
4. Gently flex the lower shock mount to release the shocks.
Removing the Rear Shocks
To gain access to the rear shocks, follow these steps. Refer to
the exploded views in the included Service and Support Guide
for reference:
1. Using the 7mm wrench included with your model, remove the
axle nuts from the rear wheels, and then remove the wheels.
2. Using the 2.0mm hex driver included with your model, remove
the upper and lower screws that secure the shocks.
Replacing Shock Oil
The shocks have to be removed from the vehicle and disassembled
to change the oil.
1. Remove the lower spring retainer and
shock spring.
2. Remove the upper shock cap. If you
cannot unscrew the cap with your
fingers, pass the 2mm 'L' wrench
through the cap's eyelet so you can apply more leverage. Turn
the cap counterclockwise to loosen it.
3. Empty the used shock oil from the shock body.
4. Fill the shock with new silicone shock oil up to the top of the
shock body.
5. Slowly move the piston up and down (always keeping it
submerged in oil) to release the air bubbles. Let the shock sit for
a few minutes to allow any remaining air bubbles to surface.
6. Slowly thread the upper cap with the installed shock bladder
onto the shock body. The excess oil will bleed out of the small
hole in the shock cap.
7. Tighten the shock cap until snug.
Springs
The front and rear springs on the model have identical spring rates,
but different lengths. Ensure the triple orange springs (three orange
marks on the spring) are on the rear, and the double orange springs
(two orange marks) are on the front. The springs' preload can be
adjusted by turning the spring pre-load adjuster. Adjusting the pre-
load changes the ride height. Adjust the preload so that the ride
height at the front of the model is 14-15mm and the ride height at
the rear of the model is 16-18mm. Rougher surfaces may require
increased ride height.