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LOSI
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22S PRO NO PREP DRAG ROLLER: 1/10 SCALE 2WD • INSTRUCTION MANUAL
BEFORE RUNNING YOUR VEHICLE
1. Check for free suspension movement. All suspension arms and steering components should
move freely. Any binds will cause the vehicle to handle poorly.
Tip:
To increase the ride height and ground clearance of your vehicle, install the included
shock spacers.
2. Charge a battery pack. Always charge the battery pack as per the battery and/or
charger manufacturers’ instructions.
3. Set the transmitter steering trim. Follow the instructions to set the steering trim/subtrim
so that the vehicle drives straight with no input to the steering.
4. Perform a Control Direction Test.
RUN TIME
The largest factor in run time is the capacity of the battery pack. A larger mAh rating increases
the amount of run time experienced.
The condition of a battery pack is also an important factor in both run time and speed. The
battery connectors may become hot during driving. Batteries will lose performance and
capacity over time.
Driving the vehicle from a stop to full speed repeatedly will damage the batteries and
electronics over time. Sudden acceleration will also lead to shorter run times.
TO IMPROVE RUN TIMES
• Keep your vehicle clean and well maintained.
• Allow more airflow to the ESC and motor.
• Change the gearing to a lower ratio. A lower ratio decreases the operating temperature
of the electronics. Use a smaller pinion gear or larger spur gear to lower the gear ratio.
• Use a battery pack with a higher mAh rating.
• Use the optimum charger to charge battery packs.
PERFORMING A CONTROL DIRECTION TEST
Perform a control test with the vehicle wheels off the ground. If the wheels rotate after the
vehicle is powered ON, adjust the TH Trim knob until they stop. To make the wheels move
forward, pull the trigger. To reverse them, wait for the wheels to stop, then push the trigger.
When moving forward, the wheels should maintain a straight line without any steering wheel
input. If not, adjust the ST Trim knob, so the wheels maintain a straight line without having to
turn the steering wheel.
TROUBLESHOOTING GUIDE
PROBLEM
POSSIBLE CAUSE
SOLUTION
Vehicle does not operate
Battery not charged or plugged in
Charge battery/plug in
ESC switch not “ON”
Turn on ESC switch
Transmitter not “ON” or low battery
Turn on/replace batteries
Motor runs but wheels
do not rotate
Pinion not meshing with spur gear
Adjust pinion/spur mesh
Pinion spinning on motor shaft
Tighten pinion gear setscrew on motor shaft flat spot
Transmission gears stripped
Replace transmission gears
Drive pin broken
Check and replace drive pin
Steering does not work
Servo plug not in receiver properly
Make sure the steering servo plug is connected to the receiver steering channel, noting proper polarity
Servo gears or motor damaged
Replace or repair servo
Will not turn one direction
Servo gears damaged
Replace or repair servo
Motor does not run
Motor wire solder joint is damaged
Resolder the motor wire with the proper equipment
Motor wire broken
Repair or replace as needed
ESC damaged
Contact Horizon Hobby Product Support
Battery voltage is low
Check battery voltage and charge if necessary
ESC gets hot
Motor over-geared
Use smaller pinion or larger spur gear
Driveline bound up
Check wheels and transmission for binding
Poor run time and/or sluggish
acceleration
Battery pack not fully charged
Recharge battery
Charger not allowing full charge
Try another charger
Driveline bound up
Check wheels, transmission for binding
Poor range and/or glitching
Transmitter batteries low
Check and replace
Vehicle battery low
Recharge battery
Loose plugs or wires
Check all wire connections and plugs
DRIVING PRECAUTIONS
• Maintain sight of the vehicle at all times.
• Routinely inspect the vehicle for loose wheel hardware.
• Routinely inspect the steering assembly for any loose hardware. Driving the vehicle
off-road can cause fasteners to loosen over time.
• Do not drive the vehicle in tall grass. Doing so can damage the vehicle or electronics.
• Stop driving the vehicle when you notice a lack of power. Driving the vehicle when
the battery is discharged can cause the receiver to power off. If the receiver loses power,
you will lose control of the vehicle. Damage due to an over-discharged Li-Po battery is
not covered under warranty.
CAUTION:
Do not discharge a Li-Po battery below 3V per cell. Batteries discharged
to a voltage lower than the lowest approved voltage may become damaged,
resulting in loss of performance and potential fire when batteries are charged.
• Do not apply forward or reverse throttle if the vehicle is stuck.
Applying throttle in this instance can damage the motor or ESC.
• After driving the vehicle, allow the electronics to cool before driving the vehicle again.
IMPORTANT:
Keep wires away from all moving parts.
POWERING ON THE VEHICLE
1. Center the ST TRIM and TH TRIM dials on the transmitter.
2. Power on the transmitter.
3. Install a fully charged battery pack per the
Installing the Battery
section.
4. Power on the ESC.
IMPORTANT:
The vehicle MUST remain on a flat, level surface and motionless
for at least 5 seconds.