Traxxas RUSTLER 4x4 ULTIMATE Owner's Manual page 30

30 • RUSTLER 4X4 ULTIMATE
ADVANCED TUNING ADJUSTMENTS
Rear differential:
1. Remove the two 3x20mm button-head screws that secure the
top bumper mount to diff case.
2. Remove the two 3x6mm flat-head screws that secure the sway
bar to rear bumper.
3. Turn the chassis over and remove the two 3x12mm countersunk
crews that hold the bumper/skid plate to the bulkhead. The two
front screws do not need to be removed.
4. Remove the 3x20mm button-head screw from the bumper
mount and tie bar.
5. Slide bumper assembly off of the chassis.
6. Remove the tie bar from the chassis.
7. Remove the two 3x15mm button-head screws from 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.
Rear Differential Removal
1. 3x20 BCS
2. 3x6 FCS
7. 3x15 BCS
4. 3x20 BCS
Refilling the differential:
1. Remove the four 2.5x10mm screws from the differential case
and carefully pull the diff 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 diff case, if you removed
them. Fill the diff case with fluid until the spider gears are
submerged half way.
4. Rejoin the diff 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 2.5x10mm 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.
3. 3x12 BCS
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
Front of Truck
the bottom of the chassis.
TUNING AND MAINTAINING THE SHOCKS
Rustler 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.