RC Car Maintenance: Beginner's Guide

Don't just toss the car in a corner when you get home.

Blow out debris with compressed air or a small brush. Dirt, grass, and pebbles work their way into the chassis, suspension, and drivetrain and act like sandpaper on moving parts. A small electric blower is better than canned air if you drive often.

Give the car a shake and listen for rattling. Vibrations loosen screws constantly, especially wheel nuts, shock tower bolts, and body clip areas. A drop of blue threadlocker on frequently loosened screws prevents this. Also check the tires. Look for tears, chunks missing from the tread, or loose beads where the tire meets the wheel. Worn tires kill handling and are cheap to replace.

Check your shocks. Press down on each corner of the car and watch how it rebounds. If a shock feels mushy or doesn't spring back smoothly, it might be leaking oil. Shock rebuilds are easy and only require replacement o-rings and new shock oil.

Inspect suspension arms and hinge pins. Wiggle each wheel side to side. Excessive play means a worn hinge pin or torn bearing. Front arms take the most abuse on bashers like the Traxxas Slash 4X4 and Arrma Granite 3S, so keep spare arms on hand.

Check your spur gear and pinion gear. Look for worn or chipped teeth. A stripped spur gear is the most common drivetrain failure and is cheap to fix. Check the mesh gap between spur and pinion. A business card should just fit between them.

Inspect bearings. Spin each wheel. It should rotate freely and quietly. Grinding or rough spots mean a bearing is failing. Bearings are cheap and make a noticeable difference in performance.

For LiPo batteries: always store at storage voltage (3.8V per cell) if you won't use them within a few days. Never leave a LiPo fully charged for more than 24 hours. Charge before your next session, not the night before.

Inspect the battery for puffing (swelling). A slightly puffy LiPo is warning you. It's damaged and should be retired. A severely puffed LiPo is dangerous and should be disposed of immediately at a battery recycling facility.

Keep battery connectors clean. Dirty or corroded connectors create resistance, which creates heat. Wipe connectors with a clean cloth after each use. If they look dark or corroded, clean with a pencil eraser or electrical contact cleaner.

For NiMH batteries: these are more forgiving. Store them anywhere at any charge level. They self-discharge faster than LiPo, so charge them the day you plan to drive.

"Waterproof" means the electronics are sealed — not that the car doesn't need cleaning. Water carries dirt, sand, and grit into every crevice. After any wet or muddy run, rinse the car with a gentle stream of water (a garden hose on low pressure, not a pressure washer).

Let the car dry completely before putting it away. Stand it on its nose or hang it to let water drain from the chassis. A quick blast of compressed air speeds this up. Lingering moisture causes corrosion on bearings, screws, and non-sealed components.

After drying, apply a light spray of bearing oil or silicone lubricant on any exposed metal parts like shock shafts, hinge pins, and turnbuckles. This prevents rust and keeps everything moving smoothly.

Keep a small stock of common wear parts: spur gears, hinge pins, body clips, and the arms specific to your car. These break on schedule, not by surprise. A quick forum search for your specific car will tell you exactly what to stockpile.

If the same part breaks three times, consider a stronger aftermarket alternative. But don't pre-emptively swap every stock part for aluminum. This is one of the most common beginner mistakes. Heavy metal parts transfer impacts deeper into the chassis and can cause more expensive failures elsewhere. Aluminum is for mounting points and structural areas. Plastic is better for arms and bumpers because it flexes on impact instead of transmitting force. The stock engineers made these material choices deliberately.

Metric hex drivers (1.5mm, 2mm, 2.5mm, 3mm), a small Phillips screwdriver, needle-nose pliers, and a nut driver for wheel nuts. Don't cheap out on hex drivers. Bad ones strip screws and bolts, which creates a much worse problem.

Add blue threadlocker, CA glue for tire repairs, shock oil, bearing oil, and electrical tape. A soldering iron is useful for battery connectors but not essential starting out. The whole kit is very affordable.