User Manual

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X-MAXX

Once you become familiar with driving your model, you might need

to make adjustments for better driving performance.

Adjusting Gear Mesh

Incorrect gear mesh is the most common cause of stripped spur

gears. X-Maxx makes improper gear mesh virtually impossible. A

pin system helps set the motor in the proper place according to the

pinion and spur gear that are selected.

To access the pin system, remove the two 3x10mm screws that

secure the gear cover and remove the gear cover. Next, remove the

four motor mount screws from the bottom of the chassis and lift off

the motor. This will expose the pins. Be sure not to lose the pins that

go between the motor and the chassis.

Select the desired gearing from the

pin location chart. Replace the spur

and pinion gears as needed. When

installing the motor, install the pins

into their proper locations based on

the gearing that is chosen. The two

pins on the bottom help to lock the

motor into the proper place for correct

gear mesh. Secure the motor in place

with four screws inserted from the

bottom of the chassis.

Note: Should you choose to do so, you can also set the gear mesh

manually without the pins. With the pins removed, use the four

4x16mm button-head cap screws on the bottom to set gear mesh.

Loosen the four 4x16mm button-head cap screws. Cut a narrow strip

of notebook paper and run it into the gear mesh. Slide the motor and

pinion gear into the spur gear. Tighten the four 4x16mm button-

head cap screws, and then remove the strip of paper. You should

be able to run a fresh strip of paper through the gears without

binding them.

Adjusting the Slipper Clutch

The model is equipped with an

adjustable slipper clutch that is

built into the large spur gear. The

purpose of the slipper clutch is to

regulate the amount of power sent

to the wheels to prevent tire spin.

When it slips, the slipper clutch

makes a high-pitch, whining noise.

To access the slipper clutch

assembly for adjustment or

removal, loosen and remove the

two 3x10mm cap screws from the

gear cover. Remove the gear cover.

Using the included wrench, make

the necessary adjustment to the

slipper clutch (B).

To remove the entire assembly,

loosen and remove the two

4x12mm button-head cap screws

and the two 4x30mm button-head

cap screws from the top shaft

cover. Remove the cover. The

entire slipper clutch assembly can

now be lifted out of the truck for

adjustment and inspection.

When removing the top shaft

assembly, be sure to inspect the

condition of the three bearings

in the slipper clutch assembly.

Ensure that they are spinning freely.

Replace the bearings if they are

showing signs of damage, wear, or

are not spinning freely.

Inspect the main input and output

gears for wear or debris in the

driveline. Clean and/or replace as

necessary. Occasionally inspect the

bearings in the center driveline to

ensure they are spinning freely.

Simply remove the upper bulkheads for access.

(Learn more about adjusting the slipper clutch in the sidebar.)

To achieve a good starting

point for the slipper clutch

in this model, remove the

slipper gear assembly from

your model (see Adjusting the

Slipper Clutch) and tighten

the slipper clutch adjusting

nut clockwise until the

slipper clutch adjusting

spring fully collapses (do

not over tighten), and then

turn the slipper clutch nut

counterclockwise 1/8 turn.

Do not run your model with

the slipper clutch adjusting

spring fully compressed. The

minimum recommended

slipper clutch setting is 1/8

turn counterclockwise from

fully compressed.

BASIC TUNING ADJUSTMENTS

Slipper Clutch Assembly Removal

3x10mm

4x12mm

BCS

4x30mm

BCS

4x16mm

BCS