Introduction
This manual provides essential information for the setup, operation, and maintenance of your ARRMA GRANITE GROM 4X4 Monster Truck. Please read this manual thoroughly before operating your vehicle to ensure safe and optimal performance. The GRANITE GROM is a 1/18 scale ready-to-run (RTR) monster truck designed for durability and performance, suitable for both indoor and outdoor use.
Image: The ARRMA Granite GROM 4X4 Monster Truck, showcasing its compact size, rugged tires, and the included Spektrum Smart LiPo battery and charger.
Important Safety Information
Warning: Read and follow all precautions and instructions before use. Improper use of batteries can result in fire or rupture, causing serious injury and damage to property.
- Never leave batteries near fire, water, or in extreme temperatures.
- Never exceed the recommended charge rate (C rating).
- Never short-circuit or alter batteries or related wires in any way.
- Always use chargers compatible with lithium polymer batteries.
- Never leave charging batteries unattended.
- Never charge batteries overnight.
- Disconnect charger if batteries become hot or puff.
- Dispose of batteries properly.
Caution: Avoid any impact on batteries. If this occurs, observe the battery pack in a safe area for 10 minutes. If any problems persist, discontinue use and contact Horizon Hobby.
Setup
What's in the Box
- (1) GRANITE™ GROM 4X4 Monster Truck RTR
- (1) Spektrum™ Waterproof SLT™ 2-in-1 25A ESC & Receiver
- (1) ARRMA MEGA 380 28T Brushed Motor
- (1) Spektrum 2.4GHz SLT2™ Transmitter
- (1) Spektrum SX110 Waterproof Metal-Geared Servo
- (1) Spektrum Smart 7.4V 1400mAh 2S 30C Hard Case LiPo Battery
- (1) Spektrum S10 Smart G2 Mini 2S USB-C Charger
- (1) GRANITE™ GROM 4X4 Monster Truck Product Manual (this document)
Required for Operation (Not Included)
A USB power supply with QC 2.0/3.0 18W+ is required to power the Spektrum S10 Smart G2 Mini 2S USB-C Charger.
Image: Illustration of a USB Power Supply, which is required to operate the included charger.
Battery Charging
Use the included Spektrum S10 Smart G2 Mini 2S USB-C Charger with a compatible USB power supply (not included) to charge the Spektrum Smart 7.4V 1400mAh 2S 30C Hard Case LiPo Battery. Always follow the safety guidelines provided in the "Important Safety Information" section when charging batteries.
Installing the Battery and Body
The GRANITE GROM features an easy clipless body mount design. To install the battery, remove the truck body by releasing the body clips (refer to the detailed product manual for specific instructions). Insert the charged battery into its compartment and secure it. Reattach the body, ensuring it clicks securely into place.
Image: View of the truck's chassis from below, showing the battery compartment and internal components, highlighting the enclosed drivetrain.
Operating Your Truck
The ARRMA GRANITE GROM is equipped with a Spektrum SLT2 2-channel 2.4GHz radio system for precise control.
Transmitter Controls
- Throttle Trigger: Pull to accelerate forward, push to brake or reverse.
- Steering Wheel: Turn left or right to steer the vehicle.
- Throttle Limiting Switch: The transmitter features a switch to limit the throttle output to 50%, 75%, or 100%. This is particularly useful for new drivers or for controlling the vehicle in smaller spaces, such as indoors.
The 1/18 scale size and adjustable throttle make the GRANITE GROM versatile for both indoor and outdoor environments. Its high-traction 4WD transmission and tough monster truck wheels and tires provide excellent performance on various surfaces.
Image: The ARRMA Granite GROM Monster Truck in motion, demonstrating its agility and robust design.
Image: The truck airborne, showcasing its durable construction and ability to handle jumps.
Image: The truck driving through dirt, highlighting its 4X4 capabilities and tough tires.
Maintenance
Regular maintenance will extend the life and performance of your ARRMA GRANITE GROM.
- Cleaning: After each use, especially in dirty or wet conditions, clean the truck to remove dirt, mud, and debris. The enclosed drivetrain offers protection, but external components should be kept clean.
- Inspecting Components: Regularly check all screws and nuts for tightness. Inspect the independent suspension and oil-filled, coil-over shocks for any damage or leaks. Ensure the tough metal gears are free of obstructions.
- Battery Care: Always store the LiPo battery in a cool, dry place and at a storage charge voltage when not in use for extended periods. Refer to the battery manufacturer's guidelines for proper storage and care.
- Tire Inspection: Check the monster truck wheels and tires for wear or damage. Ensure they are securely attached.
Image: A detailed view of the oil-filled, coil-over shock absorber, a key component for the truck's suspension and durability.
Troubleshooting
If you encounter issues with your ARRMA GRANITE GROM, refer to the following common troubleshooting steps:
| Problem | Possible Cause | Solution |
|---|---|---|
| Vehicle does not turn on. | Battery not charged or not connected. | Ensure battery is fully charged and properly connected to the ESC. Check power switch on ESC/receiver. |
| Loss of control or erratic behavior. | Low transmitter battery, interference, or out of range. | Replace transmitter batteries. Operate in an open area away from other radio signals. Ensure vehicle is within operating range. |
| Motor not responding or weak. | Low vehicle battery, motor/ESC issue, or debris in drivetrain. | Recharge vehicle battery. Check for debris in gears or wheels. If issues persist, contact support. |
| Battery becomes hot or puffs during charging/use. | Overcharging, damage, or improper use. | Immediately disconnect charger. Observe battery in a safe area. Do not use if damaged. Refer to "Important Safety Information" for battery disposal. |
For further assistance, please refer to the official ARRMA website or contact Horizon Hobby support.
Specifications
| Feature | Detail |
|---|---|
| Model Number | ARA2102T1 |
| Product Dimensions | 12 x 9.9 x 7.9 inches (30.5 x 25.1 x 20.1 cm) |
| Item Weight | 1.8 pounds (0.82 kg) |
| Scale | 1/18 |
| Drive Type | 4X4 (Four-Wheel Drive) |
| Motor Type | Brushed (ARRMA MEGA 380 28T) |
| Battery (Included) | Spektrum Smart 7.4V 1400mAh 2S 30C Hard Case LiPo |
| Charger (Included) | Spektrum S10 Smart G2 Mini 2S USB-C Charger |
| Radio System (Included) | Spektrum 2.4GHz SLT2™ Transmitter |
| ESC/Receiver (Included) | Spektrum™ Waterproof SLT™ 2-in-1 25A |
| Servo (Included) | Spektrum SX110 Waterproof Metal-Geared Servo |
| Manufacturer Recommended Age | 14 years and up |
| Country of Origin | China |
| Release Date | October 12, 2023 |
Image: Technical diagram illustrating the key dimensions (height, width, wheelbase) of the GRANITE GROM 4X4 Monster Truck.
Warranty and Support
Your ARRMA GRANITE GROM 4X4 Monster Truck comes with a 2-Year limited warranty. For full details regarding warranty coverage, please refer to the official ARRMA website.
For technical support, parts, or any product-related inquiries, please contact Horizon Hobby, the manufacturer of ARRMA products.
Manufacturer: ARRMA (Horizon Hobby)
For the most up-to-date support information and contact details, please visit the official Horizon Hobby or ARRMA website.
