User Manual

SLAYER PRO 4X4
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39
ADVANCED TUNING ADJUSTMENTS
Tuning The Sealed Gear Differentials
Slayer Pro 4x4’s front and rear gear differentials allow the left and right
wheels to spin at different speeds while turning so that the tires do
not scuff or skid. This decreases the turning radius and increases
steering performance.
The performance of the differentials can be tuned for different driving
conditions and performance requirements. The differentials are filled
with silicone differential fluid, and are sealed to maintain consistent
long-term performance. Changing the oil in the differential with either
lower or higher viscosity oil will vary the performance characteristics of
the differentials. Changing to a higher viscosity oil in the differential will
reduce the tendency for engine power to be transferred to the wheel
with the least traction. You may notice this when making sharp turns on
slick surfaces. The unloaded wheels on the inside of the turn have the
least traction and tend to spin up to extremely high rpms. Higher viscosity
(thicker) oil causes the differential to act like a limited-slip differential,
distributing more equal power to the left and right wheels. Slayer Pro
4x4 will generally benefit from higher viscosity oil when climbing, rock
crawling, or racing on low traction surfaces. Note: Heavier oil will allow
power to be transferred even with one or more tires off the ground. This
can make the vehicle more likely to overturn.
From the factory, both the differentials are filled with SAE 30,000W
viscosity silicone oil. Only use silicone oil in the differentials. Traxxas
sells SAE 10,000W and SAE 50,000W viscosity oil (see your parts list). The
differentials have to be removed from the vehicle and disassembled to
change/replace oil.
SHOCK TUNING
Shock Pistons
The shock pistons can be replaced with the available optional pistons to
vary the amount of damping. Optional pistons with bypass holes that are
smaller (#2 or #3) than the factory installed stock pistons can be used to
increase damping. From the factory, Slayer Pro 4x4 is equipped with #1
pistons in the front and rear.
Shock disassembly
The shocks must be removed from the vehicle and disassembled to
change the pistons. Use the shock exploded views included with the
model to aid in the assembly process.
1. Remove the spring and lower spring retainer from the shock.
2. Remove the shock cap (A) and empty the shock body of shock oil.
3. Remove the lower cap (B) and the X-ring from the shock body.
4. Use side cutters to grip the shock shaft just above the rod end (C).
Remove the rod end from the shock shaft using the suspension multi
tool (C).
5. Remove the shock shaft with piston
from the shock body out through
the top of the shock body.
Shock assembly
1. Replace the stock piston with
desired optional piston. Be careful
not to lose the small washer located
below the piston.
2. Position the new piston onto the
shock shaft above the small washer.
Grip the threads of the shaft with
side cutters or needlenose pliers
and tighten the nut with the 4-way
wrench to secure the assembly.
3. Insert the shock shaft assembly
through the shock body until the
piston bottoms out.
4. Lubricate the shaft and X-ring with
silicone oil.
5. Install the X-ring over the shaft and
into the bore of the shock body.
6. Install the lower cap using the
suspension multi tool (B).
7. Slide the bump stop onto the shaft.
8. Grip the shaft close to the threads
with needle nose pliers or side
cutters and thread the rod end onto
the shock shaft until the rod end
bottoms out (C).
9. Fill the shock with new silicone shock oil up to the top of the
shock body. 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.
10. Slowly thread the upper cap with the
installed shock bladder onto the shock
body with the suspension multi tool (A).
The excess oil will bleed out of the small
hole in the shock cap. Tighten the shock
cap until snug. Use the included steel
shock wrench to hold onto shock body
while tightening.
11. Reinstall the spring and lower retainer.
A. Tighten/Loosen Upper Cap
C. Remove/Install Rod End
B. Tighten/Loosen Lower Cap
Multi-tool Shock Functions
Piston Installation/Removal
Never slide the threads on
the shock rod past the X-ring
seal when it is installed and
compressed by the bottom
cap of the shock. Doing so will
damage the seal and cause
shock oil to leak.
Use higher viscosity
(thicker) diff oil for:
•
More power to the wheels
with the most traction.
•
Racing on low-traction
smooth surfaces .
•
Better performance for
climbing on uneven terrain.
Using lower viscosity
(thinner) diff oil for:
• More power to the wheels
with least traction.
• Racing on low-traction
rough surfaces.