1. Safety Information
WARNING: Read the ENTIRE instruction manual to become familiar with the features of the product before operating. Failure to operate the product correctly can result in damage to the product, personal property, and cause serious injury. This is a sophisticated hobby product. It must be operated with caution and common sense and requires some basic mechanical ability.
Failure to operate this Product in a safe and responsible manner could result in injury or damage to the product or other property. This product is not intended for use by children without direct adult supervision. Do not use with incompatible components or alter this product in any way outside of the instructions provided by Horizon Hobby, LLC.
The product manual contains instructions for safety, operation, and maintenance. It is essential to read and follow all the instructions and warnings in the manual, prior to assembly, setup, or use, in order to operate correctly and avoid damage or serious injury.
2. Product Overview
The ARRMA Mojave 4X4 4S BLX is an 1/8th scale desert truck designed for high-speed, off-road performance. It features a durable chassis and powerful brushless system for an exciting driving experience.

Image: The ARRMA Mojave 4X4 4S BLX Desert Truck, showcasing its blue and red body design.
Key Features:
- Scale desert truck body with two color options.
- 4S LiPo-capable Spektrum brushless power system.
- Rugged center differential, a new addition to the 4S BLX 4X4 platform.
- Wishbone dirt guards, outdrive protectors, and chassis dirt drain for enhanced durability.
- Inner body with scale looks and added dirt protection.

Image: An internal view of the truck's chassis, highlighting the robust drivetrain and motor components.
3. Package Contents
Your ARRMA Mojave 4X4 4S BLX Desert Truck RTR package includes the following items:
- 1/8 MOJAVE™ 4X4 4S BLX Desert Truck RTR (Ready-to-Run)
- Remote control transmitter
- Spektrum SR315 DSMR® 3-Channel Receiver (installed)
- Spektrum S652 Metal-Geared Waterproof Digital Servo (installed)
- Spektrum Firma™ 3668 2400Kv Brushless Motor (installed)
- Spektrum Firma 120A Smart Brushless ESC (installed)
- 4 AA Transmitter Batteries
- MOJAVE™ 4X4 4S V2 BLX Desert Truck RTR Manual
4. Setup
This vehicle is sold as Ready-to-Run (RTR), however, a LiPo battery and charger are NOT INCLUDED and must be purchased separately. Ensure you have the correct battery and charger before proceeding.

Image: Illustration of required LiPo batteries (2S, 3S, or 4S) and a charger, along with maximum battery tray dimensions (L: 163mm / 6.42in, W: 51mm / 2.01in, H: 48mm / 1.89in).
4.1 Battery Installation
- Ensure the vehicle's power switch is in the OFF position.
- Open the battery compartment.
- Insert a compatible LiPo battery (2S, 3S, or 4S) into the battery tray, ensuring it fits within the maximum dimensions (L: 163mm / 6.42in, W: 51mm / 2.01in, H: 48mm / 1.89in).
- Secure the battery using the provided straps or clips.
- Connect the battery to the ESC. Refer to the ESC manual for specific connection details.
- Close the battery compartment securely.
4.2 Transmitter Setup
- Install the four AA batteries into the transmitter.
- Turn on the transmitter.
- Turn on the vehicle's power switch. The transmitter and receiver should automatically bind. If not, refer to the detailed manual for binding instructions.
5. Operating Instructions
Before operating, ensure all components are securely fastened and the battery is fully charged. Always operate the vehicle in a safe, open area, away from people, pets, and obstacles.
5.1 Basic Controls
- Throttle Trigger: Pull to accelerate forward, push to brake/reverse.
- Steering Wheel: Turn left or right to steer the vehicle.
- Trim Adjustments: Use the trim dials on the transmitter to fine-tune steering and throttle neutral positions if the vehicle does not track straight or stops when the trigger is released.
5.2 Driving Tips
- Start with slow speeds to familiarize yourself with the controls.
- Avoid sudden, sharp turns at high speeds to prevent rollovers.
- The 4S LiPo-capable system provides significant power; manage throttle input carefully, especially on loose surfaces.
- The vehicle is designed for outdoor use on dirt, sand, and other off-road terrains.
6. Maintenance
Regular maintenance ensures optimal performance and longevity of your ARRMA Mojave truck. Perform these checks after every run or periodically.
6.1 Post-Run Checks
- Clean the Vehicle: Remove dirt, dust, and debris from the chassis, suspension, and drivetrain using a soft brush or compressed air. The wishbone dirt guards and chassis dirt drain assist in keeping components clean.
- Inspect for Damage: Check for any broken or loose parts, especially on the suspension, steering linkages, and wheels.
- Check Fasteners: Ensure all screws and nuts are tight.
- Examine Tires: Check for wear, tears, or punctures.
- Battery Care: Disconnect and properly store LiPo batteries after use. Never leave them fully charged or fully discharged for extended periods.
6.2 Drivetrain Maintenance
- Gear Mesh: Periodically check and adjust the gear mesh between the pinion and spur gear to prevent premature wear.
- Differential: Inspect the center differential and outdrives for smooth operation and signs of wear.
- Bearings: Clean and lubricate bearings as needed.
7. Troubleshooting
This section provides solutions to common issues you might encounter with your ARRMA Mojave truck.
| Problem | Possible Cause | Solution |
|---|---|---|
| Vehicle does not respond to transmitter. | Low transmitter batteries, discharged vehicle battery, binding issue. | Replace transmitter batteries, charge vehicle battery, re-bind transmitter and receiver. |
| Loss of power or intermittent operation. | Low vehicle battery, loose connections, motor/ESC overheating. | Charge battery, check all electrical connections, allow components to cool. Consider a fan upgrade for overheating issues. |
| Vehicle pulls to one side. | Steering trim incorrect, damaged steering component. | Adjust steering trim on the transmitter. Inspect steering linkages and servo for damage. |
| Unusual noises from drivetrain. | Incorrect gear mesh, debris in gears, worn gears. | Check and adjust gear mesh. Clean gears. Replace worn gears if necessary. |
For more detailed troubleshooting, refer to the comprehensive manual included in your package or visit the ARRMA support website.
8. Specifications
| Brand Name | ARRMA |
| Model Name | ARRMA Mojave RC Truck 4X4 4S BLX 1/8th Scale Desert Truck RTR |
| Model Number | ARA4404T2 |
| Scale | 1:8 Scale |
| Material Type | Plastic |
| Power Source | Battery Powered (Battery and Charger Not Included) |
| Item Weight | 6.6 Pounds |
| Item Dimensions (LxWxH) | 32.2 x 11.9 x 15.1 inches |
| Age Range Description | Kid (Manufacturer Minimum Age: 168 months) |
| Operation Mode | Remote Control |
| Color | Multicolour (Blue/Red) |