Traxxas 68277-4 Owner's Manual page 30

30 • SLASH 4X4 ULTIMATE
ADVANCED TUNING ADJUSTMENTS
6. Remove the tie bar from the chassis.
7. Remove the two 3x15mm button-head screws from the differential
cover. Do not remove the two screws that secure the shock tower.
8. Remove the differential cover and slide the differential out of the
front of the case.
9. To reinstall the differential, reverse the steps.
Refilling the differentials:
1. Remove the four 2.5x8mm screws from the differential case and
carefully pull the differential case halves apart. Work over a towel
to collect any fluid that drips from the differential.
2. Drain the fluid from the differential. You may wish to remove the
spider gears from the differential to make this easier.
3. Place the spider gears back into the differential case, if you
removed them. Fill the diff case with fluid until it the spider gears
are submerged half way.
4. Rejoin the differential case halves, using care to align the screw
holes. Be sure the rubber gasket is in place, or the differential may
leak.
5. Install the 2.5x8mm screws and tighten securely.
Center differential
The optional center differential (part #6814, sold separately) allows
the power from the motor to be transferred to the front and rear
differentials independently from one another. When the rear wheels
are under more load than the front wheels, more power will be
transmitted to the front wheels. This is very beneficial on rough terrain
and makes hard acceleration from low speeds easier to control by
keeping the nose down. The center differential is assembled with
100K differential lube from the factory. This viscosity will be a good
base point for most conditions.
1. Locate and remove the two 4x12mm button head machine
screws from the top rear of the chassis and the two 4x14mm
button head machine screws from the bottom of the rear
suspension bulkhead (See page 26 for reference).
2. Remove the modular rear end from the chassis by sliding it
backward away from the chassis. This is to access the spur gear/
slipper unit. Remove the spur gear/slipper unit from the rear of
the chassis.
3. Insert the included center differential unit into the rear of the
chassis (where the spur gear/slipper unit was removed). Stand
the chassis up on the front bumper to hold the spur gear steady
and line it up with the pinion gear. The splined shaft adapter
must key into the aluminum center drive shaft.
4. Attach the rear end unit to the chassis keying in the rear output
shaft of the center differential with the opening in the rear
differential. Secure the assembly with the same four button-head
screws.
Tip: Rotate the rear wheels slowly while attaching the rear end
to the chassis to properly set the rear output shaft of the center
differential into the rear differential. You should feel the rear end
set into place. The rear skid plate should lock into the bottom of
the chassis.
TUNING AND MAINTAINING THE SHOCKS
Slash 4X4 Ultimate features high-performance GTR shocks that
utilize friction-reducing titanium nitride shafts and hard-anodized
bodies with PTFE-coated bores to provide the ultimate in precise
damping control. The shocks are filled with 30W silicone fluid. You
may wish to install lower-viscosity ("thinner") or higher-viscosity
("thicker") fluid to alter damping performance to suit your track,
terrain, or driving style. Damping can also be altered by changing
the pistons inside the shocks. The front piston is a 2-hole with
1.5mm diameter holes. The rear piston is a 2-hole with 1.6
diameter holes.
Shock Oil
The 4 oil-filled aluminum 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 easily over jumps. 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. From the factory, the shocks are filled with
SAE-30W silicone oil. Only use 100% silicone oil in the shock.
Replacing Shock Oil
For easier service, the shocks should be removed from the vehicle