The Build – Part 8 Installing the electronics in the EXO does require a little patience. Axial has included plenty of wire tie-downs to make sure none of your wires find their way into the drivetrain, but all this does require a little bit of time to do correctly. Take your time and you won’t have to do major surgery to repair any of it.
Build Notes: The EXO can handle quite a bit of power. It can also accept a 540 or 550 size brushless motor! Special pinions will be needed if using a 550 size motor.
A special mount is included for use with the Novak Havoc ESC. This mount is not required with other ESCs.
While the receiver mounts in a water-resistant case, I chose to install Axial’s NVS lighting system in the same box. Doing this required the removal of the receiver box top, making my EXO non-water-resistant. I can deal with that for the absolute killer look the EXO now has.
Axial EXO Terra Build - Step 73 The first step is to attach your motor to the aluminum motor mount. Simple and straightforward, but note that the wire tabs on the motor should be facing up.Axial EXO Terra Build - Step 74 Next, attach your pinion gear. A dab of loctite is suggested on the set screw. The slot at the bottom of the motor mount will allow you to feed the pinion deep into the mount and still tighten the set screw.Axial EXO Terra Build - Step 75 Slide the motor and mount into the chassis mounted motor mount. Screw the adjustment screw and set screw into the mount as shown. Do not tighten yet.Axial EXO Terra Build - Step 76 This close-up shows the lower adjustment screw and the upper set screw. By tightening the lower adjustment screw, you will widen the gear mesh between the pinion and spur. Loosening this screw will tighten the gear mesh. Set this screw so there is a very slight backlash between these two gears. Once you are happy with the mesh, tighten down the upper set screw. It does not say this in the manual, but I would suggest a DAB of loctite on these two screws to keep them from backing out.Axial EXO Terra Build - Step 77 For steering purposes, I’m going with Hitec HS-7955TG Titanium Geared servo. This servo has a monster 333oz of torque; perfect for the heavy duty driving this bad boy is about to endure!Axial EXO Terra Build - Step 78 Attach the servo to the servo mount as shown.Axial EXO Terra Build - Step 79 Before installing the servo to the chassis, feed the servo lead through the wire-capture-tab next to the front chassis brace as shown. This can be a bit tricky once the servo is installed.Axial EXO Terra Build - Step 80 Attach the servo and mount to the chassis.Axial EXO Terra Build - Step 81 Press the servo lead into the wire-slots located next to the receiver box. This is important!!!! It helps keep the wire away from the central gears.Axial EXO Terra Build - Step 82 Build the steering link. Axial’s recommendation of 25mm is spot on.Axial EXO Terra Build - Step 83 Choose the correct servo arm for your servo and attach one end of the link to it.Axial EXO Terra Build - Step 84 Attach the servo arm to the servo and connect the other end of the steering link to the steering bellcrank.Axial EXO Terra Build - Step 85 Your assembly should look like this.Axial EXO Terra Build - Step 86 Feed the pin through the rubber battery strap. The straps are a VERY rubbery, well, rubber, and will take a little coaxing to get them through.Axial EXO Terra Build - Step 87 Build a pair of battery holddowns. The battery straps have 3 holes in them for different size batteries. I started with the middle hole. Note the direction of the pieces.Axial EXO Terra Build - Step 88 Attach the battery straps to the chassis. At this time it is also a good idea to test fit the battery you will be using. Mine was a bit to big, so I had to rebuild my battery holddowns and use the lower hole. You don’t want to do this step after you’ve completed the EXO. Trust me.Axial EXO Terra Build - Step 89 Oddly enough, I will be using Novak’s Havoc ESC. I didn’t know that this ESC had it’s own special mount! This makes it easy as pie to install!Axial EXO Terra Build - Step 90 Attach the fan to the top of the ESC, the ESC to the mount and the switch to it’s separate mount. No tape required!Axial EXO Terra Build - Step 91 The ESC mount lines up with a pair of holes. Boom, done. Feed the wires from the ESC through the chassis mounted wire-ties.Axial EXO Terra Build - Step 92 Axial has also added another slick wire-tie on the rear chassis mount. Route your power wires from the ESC through here.Axial EXO Terra Build - Step 93 Connect the sensor wire to the ESC.Axial EXO Terra Build - Step 94 Solder the wires onto your motor. Remember, A goes to A, B to B and C to C. Mixing these up will result in your car going backwards. Really fast.Axial EXO Terra Build - Step 95 Even though my setup is a little different, I am showing you this step. Fit the rubber grommet over the receiver box. It might be a bit of a pain so a little bit of grease on the corners will help keep it in place.Axial EXO Terra Build - Step 96 Tape the receiver to the lid of the receiver box. Feed the wires through the lid and plug into the receiver. Attach the water-resistant foam and cap and install to the receiver box.Axial EXO Terra Build - Step 97 I added the NVS to the receiver box as shown. Yes, the wires are a bit of a mess right now but that will soon be fixed. This is mainly to show how the NVS was installed.Axial EXO Terra Build - Step 98 Feed the receiver antenna through the hole and slide up the antenna tube. Press the antenna tube into the hole and secure with the set screw.
Tony Phalen - As an avid RC enthusiast, Tony has been building, bashing and racing RC Cars for over 30 years. He has participated in every kind of surface racing events - 1/18 scale trucks, 1/10 scale TC, Rock Racers, Rally - if it had wheels, he's raced it! He's also worked on both sides of the industry fence; collaborating with many major manufacturers (as well as being a sponsored driver) to working for a high-profile industry magazine. During this time he has learned many tricks, tips and techniques and is sharing that knowledge on CompetitionX - the most informative RC website on the internet!