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With the transmitter and receiver turned on, and the throttle/brake trim lever centered, the
truck should roll smoothly (i.e., the brakes should be disengaged). If the brakes are
dragging when the throttle trigger is at neutral, the brake discs will wear out very quickly.
To ensure that the brakes are disengaged, always make sure that there is a 1/16" gap
between the two rear adjustment collars and the brake levers. Both adjustment collars
should be adjusted so that they are equal distance behind each of the two brake levers.
This will ensure that both brake levers engage equally during braking.
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To make adjustments to the brake linkage, simply loosen the grub screw in the
adjustment collar behind each brake lever and reposition it, then retighten the grub screw.
The Mammoth RTR Nitro Monster Truck uses a dual-disc brake system. The brake linkage is preset from the factory; however, after
running the truck for awhile you may find that the brake linkage needs adjusting.
Step 5: Adjusting the Brake Linkage
The transmission shift point has been preset for you from the factory, but it is possible to fine tune the adjustment to suit your driving
style. The shift point is the point at which the 2-speed transmission will shift from first gear to second gear.
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Adjust the shift point by turning the small grub screw in the aluminum 2-speed clutch housing using a 1.5mm hex wrench. Turning the
grub screw clockwise will make the transmission shift at a higher speed. Turning the grub screw counterclockwise will make the
transmission shift at a lower speed.
RECOMMENDED INITIAL SETTINGS:
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The 2-Speed transmission has been preset for you from the factory. No adjustments are necessary.
Step 6: Adjusting the 2-Speed Transmission Shift Point
To adjust the 2-speed transmission, you must first locate the small grub screw in the
clutch housing. To locate the screw, lift the truck off the ground and slowly rotate the spur
gear assembly until the you can see the small grub screw through the milled access hole
in the clutch housing. Once the small grub screw is visible, use a 1.5mm hex wrench to
adjust the grub screw. To make the transmission shift at a higher speed, turn the grub
screw clockwise 1/8th of a turn. To make the transmission shift at a lower speed, turn the
grub screw counterclockwise 1/8th of a turn.
✦✦
✦✦
✦WARNING
✦✦
✦✦
✦ We suggest making 1/8th of a turn adjustments at a time, testing the
truck's shift point between each adjustment you make, until you are satisfied with how
the truck shifts.
✦✦
✦✦
✦IMPORTANT
✦✦
✦✦
✦ There are two screws in the 2-speed clutch housing. One is a grub screw that uses a 1.5mm hex wrench and the
other is a steel socket-cap screw that uses a 2.5mm hex wrench. Do not attempt to adjust the larger screw. This screw holds the
clutch housing onto the transmission shaft.
The Mammoth RTR Nitro Monster Truck features front and rear gear differentials that each feature five o-ring seals and cup-style
housings. Both differentials are packed with differential grease that is good for most driving conditions.
You can make fine-tuned adjustments to each differential by removing the differentials from the chassis, opening them up and replacing
the grease already inside the differentials with heavy-weight silicone shock oil. Removal, disassembly and reinstallation of the differentials
can be done using the exploded parts diagram included with your kit.
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Adding heavier silicone oil will tighten the differentials and adding lighter silicone oil will loosen the differentials. If your truck feels
loose during turns, you can tighten the front differential or loosen the rear differential. If your truck is pushing during turns, you can
loosen the front differential or tighten the rear differential. We recommend using silicone shock oil weights between 30,000 and 100,000.
✦✦
✦✦
✦WARNING
✦✦
✦✦
✦ We don't recommend attempting to make adjustments to the differentials unless you have knowledge of how to
remove, disassemble and reassemble gear differentials. If you don't reassemble the differentials properly, damage to the differentials
will happen quickly and will not be covered by warranty.
Step 7: Adjusting the Front and Rear Differentials
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