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Traxxas 4801 Assembly Manual, Tuning Manual
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Traxxas 4801 Assembly Manual, Tuning Manual

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ASSEMBLY MANUAL,
TUNING GUIDE
MODEL 4801

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Summary of Contents for Traxxas 4801

  • Page 1 ASSEMBLY MANUAL, TUNING GUIDE MODEL 4801...

  • Page 2: Assembly Hints

    Nitro 4-Tec Pro kit for return or exchange after any of 4-way wrench U-joint assembly tool the kit bags have been opened. If you have any ques- tions about your new Nitro 4-Tec Pro, call Traxxas’ tech- 2.5mm Hex wrench Turnbuckle wrench nical support department at (888)TRAXXAS (U.S.A. res- idents only).
  • Page 3 WARRANTY STATEMENT Countersunk Cap Screw Every effort has been made in component design and material selection to make your model as durable as Buttonhead Cap Screw possible and still maintain a competitive race weight. Because this model is intended for use in high speed Shoulder Screw competition under the most severe conditions, no war- ranties are expressed or implied relating to the longevity...

  • Page 4: Personal Safety Precautions

    Recommended Application: Sport/recreation running in very large areas help ensure safe operation. Traxxas Corporation shall not be liable for any loss or damages, whether direct, indirect, OPTIONAL CLUTCH GEARS 1st..16 ..45 ..2.81 ..6.38 ..34.0 w/STOCK SPUR GEARS 2nd ..20 ..41 ..2.05 ..4.65 ..46.6...
  • Page 5 or too far out (locked in second gear). If the car has SHIFT POINT ADJUSTMENT quick acceleration and does not appear to shift, the transmission is never reaching the shift point. The The Nitro 4-Tec Pro comes equipped with a two-speed transmission.

  • Page 6: Spring Specifications

    7) Check the exhaust system for leaks, cracks, or tears. Do not run the car if there are any exhaust leaks. 8) Use Traxxas Nitro Wash spray cleaner to keep the Nitro 4-Tec Pro clean of accumulated dirt and oil.
  • Page 7 N4T Pro Assembly Procedure: 1) Assemble dampers and springs per the instructions. Dampers should be 65.5mm overall when assembled. Set aside. Bag A Remove the shock parts from Bag A. Pour the contents of each individ- ual bag into the corresponding compartment of the plastic parts box. Insert a 6x.7mm clear spacer into the bottom of the aluminum shock body.
  • Page 8 STEP A-6 Secure the bottom shock assembly with a C-clip. Use C-clip pliers to compress the C-clip and and insert it into the groove in the bottom of the shock body. If you do not have any C-clip pliers or strong, sharp tweez- ers, try inserting one side of the C-clip into the groove and then carefully push the other side into the groove with a small screwdriver.
  • Page 9 STEP A-11 Place a drop of 60WT shock oil on the threaded end of the shock shaft and insert it into the shock body. Carefully push the threaded part of the shaft past the seals in the bottom shock assembly. STEP A-12 Slide a blue O-ring over the end of the shock shaft.
  • Page 10 STEP A-16 Pull on the shock rod so that the piston head travels to the bottom of the shock body. Fill the shock with 60WT oil until it is about 3/4 full. Slowly move the piston up and down to remove any air bubbles. If necessary, allow the shock to stand until all the bubbles rise to the top.
  • Page 11 BAG B Ball Differential This drawing is provided to help you identify the parts of the ball differential by name. Thrust washer Belleville Ball Ball retainer spring Bearing Bearing washers Thrust Right Diff shaft Diff balls Left bearing output shaft Diff ring output Thrust washer...
  • Page 12 STEP B-6 Locate a 26mm diff ring. Note that one face of the ring has a rounded edge. The opposite face is Rounded edge on sharp. Place the ring onto the face of the aluminum face thrust washer retainer so that the so that the side with the rounded edge faces you.
  • Page 13 STEP B-11 right output shaft assembly Screw the right output shaft assembly from STEP B-8 onto the diff shaft from the opposite side of the main pulley. Make sure that the belleville washers are compressing, without binding. Tighten until the threads stop.
  • Page 14 STEP C-3 Snap in the metal hollow ball connectors with needle nose pliers. STEP C-4 Rear Camber links (Quantity: 2) Use the long rod ends on 24mm turn- buckles for the rear rear camber links. Assemble as shown. Snap in the metal hollow ball connectors.
  • Page 15 STEP C-8 Assemble the upper control arms as shown. The center-to-center dis- tance should be 42mm. Set all of these assembled linkage components aside. 42mm BAG D DRIVE SHAFT STEP D-1 Drive shafts: In bag D, find the sub-bag containing the drive shaft com- ponents.
  • Page 16 STEP D-5 Insert another pin into one ear of the stub axle joint. STEP D-6 Use the u-joint assembly tool to push the remaining pin into the stub axle yoke. Again, apply pressure down while pushing so that both ears will spread.
  • Page 17 STEP D-10 Insert (2) 3x3mm grub screws into each of the (4) differential output yokes. Do not screw them in all the way. Set the drive shaft assemblies aside. BAG E: Sway Bars Sway Bars: Locate the bag labeled “Sway Bars.” Find the (4) nylon sway bar links.
  • Page 18 Insert a 3x25mm Buttonhead machine screw through the ears on the front differential housing cover. Secure each screw with a 3mm flange nut. Locate one of the ball differentials and (2) 10x15x4mm ball bearings. The bearings are in Hardware Bag. Press a 10x15x4mm ball bearing onto each side of the ball differential.
  • Page 19 Secure the cover to the housing in the front with (2) 3x8mm buttonhead machine screws. Secure the cover to the housing in the rear with (2) 3x6mm countersunk self-tapping screws. Set this assembly aside. Rear Shock Tower: Locate the rear shock tower, (2) 3x20mm buttonhead machine screws, and (2) 3mm flange nuts.
  • Page 20 F-12 Locate the graphite rear brace and the plastic bushing. F-13 Use CA (cyanoacrylate) glue to glue the bushing into the graphite rear brace. Note the orientation of the brace. The plastic bushing pushes into the hole from the top. Set this assembly aside. F-14 Rear Side Plates: Locate the right rear side plate, (1) belt tension cam, (1) 5x11x4mm ball...
  • Page 21 F-17 Insert the belt tension cam, with bearing, into the right side plate. Position the notch in the belt tension cam in the forward-most slot (arrow). This is the loosest setting. Set this assembly aside. F-18 Right Stiffener and Brake Assembly: Locate the right stiffener, the pulley shaft (two-speed shaft), (1) 5x8x.5 plastic washer, (1) 5x11x4mm ball bearing, the brake hub, (1) metal pin, (2) metal brake pads, the graphite brake disk, (2) 3x15mm caphead...
  • Page 22 F-22 Slide the graphite brake disk onto the brake hub. F-23 Snap a large E-clip into the groove in the top of the blue-anodized brake cam. F-24 Insert the end of the brake cam (opposite the E-clip) into the hole in the bottom corner of the right stiffener.
  • Page 23 F-27 Insert the remaining 3x15mm caphead shoulder screw through the bot- tom hole on each of the brake pads and then into the stiffener. Tighten the screw until it stops. F-28 7.5mm Adjusting the Brake Pads: Screw the upper and lower brake pad screws into the stiffener until there is only 7.5mm of exposed screw shoulder between the pads.
  • Page 24 F-32 Slide on the 15-groove pulley so that the slot in the pulley engages the axle pin in the shaft. Slide on the pulley flange with the beveled side of the flange facing the pulley (flat side faces out). F-33 Secure the 15-groove pulley with a large (5mm) E-clip.
  • Page 25 F-37 Locate the left side plate assembly, the 50-groove belt, the remaining ball differential, and the graphite rear shock tower assembly. F-38 Position the ball differential so that the differential pulley is offset toward the right side plate. Place the belt around the differential pulley. F-39 Fit the belt around the 15-groove pulley and then insert the differential output shaft into the 10x15x4mm ball bearing in the right side plate.
  • Page 26 F-42 Locate the graphite rear brace. Install the rear brace, as shown, with (6) 3x8mm buttonhead machine screws. F-43 Adjust the brake if necessary. Insert the 2.0 hex wrench under the rear brace as shown. The rear mechanism should spin freely without drag- ging.
  • Page 27 F-47 Attach the lower rear suspension arms to the side frames by inserting the 38mm hinge pins through the pivot point. Carefully notice how the arms are positioned in the photo. Secure the opposite end of each hinge pin with a small E-clip. F-48 Attach the left stub axle housing to the end of the the left suspension arm and the right stub axle housing to the right suspension arm by...
  • Page 28 F-52 38mm Find the (2) rear camber links (38mm center-to-center), (2) 3x15mm countersunk machine screws, and (2) 3x12mm countersunk machine screws. F-53 Attach the camber links to the upper inside holes in the ears of the side plates with the 3x12mm countersunk machine screws. F-54 Attach the outer ends of the camber links to the stub axle housings with 3x15mm countersunk machine screws.
  • Page 29 BAG G Two Speed Assembly: Locate the 45-tooth spur gear and the outer aluminum gear hub (with the one-way bearing installed). slide the 45-tooth spur gear onto the outer aluminum gear hub so that the notches in the hub engage the tabs molded into the gear. Secure the gear to the hub with the snap ring.
  • Page 30 Locate the 41-tooth spur gear and another snap ring. Slide the spur gear onto the hub so that the pins in the hub engage the holes in the spur gear. Install the snap ring. Two speed adjustment screw. Locate the drive hub. Set the adjustment set screw to be flush with the counter bore as shown.
  • Page 31 G-11 Insert an axle pin into the hole in the two speed shaft. G-12 Slide on the 20-groove pulley so that the slot in the pulley engages the axle pin in the shaft. Slide on the pulley flange with the beveled side of the flange facing the pulley.
  • Page 32 Turn the bearing block over with the smooth edge facing you (arrow1) The bearing block spacers have a slight taper (cone shape) on one end. Insert the two 3x6x8.9mm blue spacers, tapered end first, into the bear- ing block as shown. Position the battery plate as shown so that the countersunk holes align with the spacers on the bearing block.
  • Page 33 Place the bearing block assembly onto the top plate as shown. Sandwich the assembly with your fingers and turn it over. Insert two 3x20mm buttonhead machine screws through the remaining bearing block holes. H-10 Secure the 3x20mm screws with 3mm locknuts. H-11 Steering Stops: Locate (2) 3x6x1.5mm aluminum spacers, (2) 3x6x2.5mm aluminum...
  • Page 34 H-13 Slide a 3x6x1.5mm aluminum spacer over the end of each screw and secure them with 3mm locknuts. H-14 Locate the fuel tank and the rubber fuel tank isolators. H-15 Install the main isolator (the wider one) around the main seam of the tank.
  • Page 35 H-18 Attach the antenna mount to the receiver plate with the 3x8mm button- head machine screw. H-19 Locate the left stiffener (leftover from Bag F), (3) 3x6x8mm aluminum spacers (blue anodized), (3) 3x20mm buttonhead machine screws, and the fuel tank assembly. H-20 Insert the 3x20mm buttonhead machine screws through the holes in the receiver plate.
  • Page 36 H-23 Locate the rear suspension/ right stiffener assembly from step G-12. Fasten the top plate assembly to the right stiffener (3) 3x8mm and (1) 3x10mm buttonhead machine screws. 3x10mm H-24 Locate the front pulley shaft, a 15-groove pulley and flange, a 20-groove pulley and flange, (2) axle pins, (2) large E-clips (5mm), and the 121- groove (middle) belt.
  • Page 37 H-28 Slide the pulley flange onto the shaft with the beveled edge facing the pulley. Secure the pulley with a large E-clip. BAG-I Bellcrank Assembly Bellcrank Assembly: Locate the left and right bellcranks and (4) 5x8mm ball bearings. Insert two 5x8mm ball bearings into each bellcrank Locate the (2) bellcrank posts, (2) bellcrank spacers, (1) 3x8mm and (1) 3x10mm buttonhead machine screw.
  • Page 38 Slide a bellcrank spacer over each bellcrank post. Attach the left bellcrank to the graphite top plate assembly with a 3x8mm 3x8mm buttonhead machine screw. Attach the right bellcrank post to the Boss top plate assembly with a 3x10mm buttonhead machine screw. The bell- crank spacer should be sandwiched between the top plate and the bell- 3x10mm crank.
  • Page 39 I-10 Slide the graphite tie bar over the hinge pins as shown. It may be nec- essary to use a 1/8” (.125) drill bit to open up the holes in the tie bar. Secure the opposite end of each hinge pin with a small E-clip. I-11 Locate the front sway bar.
  • Page 40 I-15 Position the front bumper with the lower suspension arm mount as shown. The tab on the bumper locks into the lower mount. I-16 Position the front differential housing onto the lower suspension arm mount. The tabs on the side of the differential housing should engage the slots in the lower mount.
  • Page 41 I-20 Turn the assembly over and fasten the lower chassis to the upper chas- sis with (16) 3x10 countersunk machine screws in the locations indicat- ed in the photo. I-21 Locate the drag link from step C-5 (50mm center-to-center), (2) 3x10mm caphead machine screws, and (2) 3x6x.5mm flat metal washers.
  • Page 42 I-25 Snap a small E-clip into one groove of each of the hinge pins. I-26 Attach the upper front control arms to the upper control arm mount by inserting 33.5mm hinge pins through the pivot points. Secure the oppo- site end of each hinge pin with a small E-clip. I-27 3x12mm Position the upper control arm assembly on the upper chassis as...
  • Page 43 I-30 Insert the threaded metal inserts into the front axle housings. If necessary, use a drop of CA glue (Super Glue™) on each to pre- vent them from falling out during assembly. I-31 Insert the bearings into the front axle housing. I-32 Locate the male front drive shaft assemblies (with the differential output yokes).
  • Page 44 I-35 Bosses Insert the metal stub axle through the ball bearings in the front axle housing. Note that the stub axle housings are labeled “L” and “R” for left and right. Apply a drop of threadlocking compound to the threads of a 3x8mm caphead machine screw.
  • Page 45 I-40 Shock Installation: Locate the front and rear shocks, (4) nylon shock mounting bushings with washers, (4) 3mm nylon locknuts, and (4) 3x15mm countersunk machine screws. I-41 The shock mounting procedure is the same for all four shocks. Begin by sliding a nylon shock mounting bushing over the long screws in the front and rear shock towers.
  • Page 46 I-45 By now, your Nitro 4-Tec Pro should look fairly complete. Now it’s time to install the engine and radio gear. BAG-J Engine Mount Radio system installation Locate the engine mount, (1) 3x20mm countersunk machine screw, (1) 3x25mm countersunk machine screw, and (4) 3x10mm shoulder screws. Insert the engine mount between the left stiffener and the left side frame as shown.
  • Page 47 Place a drop of thread locking compound on the threads of the clutch bell. Screw the 19-tooth gear onto the clutch bell followed by the 15- tooth clutch bell. Place a heavy rag around the 15-tooth gear and use pliers to torque the gear to approximately 5 in-lbs. Press the two 5x10mm ball bearings into the center of the clutch bell.
  • Page 48 J-12 Secure the flywheel to the crankshaft with the clutch adapter nut. Hold the flywheel with a pair of “Channel Lock™” pliers while torquing the adapter nut. J-13 Install the clutch shoes as shown. Refer to the diagram to ensure that the leading and trailing edges of the clutch shoes are positioned correctly.
  • Page 49 J-16 Install the engine into the chassis. The engine assem- bly is a tight fit. In order to install it, you will need the move the brake disk towards the center of the car and fit the engine flywheel on the opposite side of the disk (between the right stiffener and the brake disk).
  • Page 50 J-21 Insert the gasket between the header and the engine. Fasten the header to the engine with the (2) 3x23mm caphead machine screws and 3x5mm split lockwashers. J-22 Install the throttle return spring between the spacer and the 3x20mm buttonhead machine screw (removed in step J-19). J-23 Reinstall the 3x20mm buttonhead machine screw with the throttle return screw.
  • Page 51 Attach one end of the steering link to the servo saver with the 3x15mm countersunk machine screw and the 3mm nylon locknut. Attach the remaining end of the link to the inside hole in the left bell- crank with a 3x12mm countersunk machine screw. Note: If your radio system does not have steering end point adjustment, we recommend that you attach the link to the outside hole on the bellcrank.
  • Page 52 Locate your steering servo, the steering servo mounts, (2) 3x10 mm countersunk machine screws, and (4) 3x8mm buttonhead machine screws. Attach the steering servo to the steering servo mounts with the (4) 3x8mm buttonhead machine screws. Note that the servo output shaft is on the right in the photo.
  • Page 53 K-15 Locate the servo saver adapters. The servo saver will fit standard Traxxas and Futaba standard servos without an adapter. Sanwa and Airtronics servos may require an adapter. K-16 Install the servo saver with adapter (if necessary) onto the steering servo in the 12:00 position (straight up).
  • Page 54 K-18 Locate the throttle/brake servo horn, (2) rod guides, and (2) 3mm lock- nuts. Note: the servo is compatible with Traxxas and Futaba standard servos. If you are using another brand of servo, use one of the universal servo horns included with your radio system.
  • Page 55 K-23 Insert the end of the throttle rod through the top hole on the carburetor throttle arm. Attach the servo horn to the servo, as shown, with the screw included in your radio system. K-24 Locate the brake cam lever and a 3mm grub screw. K-24 Insert the brake cam through the brake cam.
  • Page 56 K-27 Fasten a screw collar to one end of the brake rod with a 3mm grub screw. K-28 Locate your tuned pipe (not included in kit), the pipe coupler, the exhaust hanger wire, 3x10mm countersunk machine screw, and 3mm locknut. K-29 Attach the pipe support to chassis.
  • Page 57 Bag L Wheels and Tires Locate (4) molded foam inserts, (4) tires, and (4) wheel rims. Wash the tires in warm soapy water. Let them dry completely before continuing. Install the inserts into the tires. foam insert Stretch the tires over the rims. Note: the tires are directional. Place the wheels around the car to make sure that the arrows in the tread design on each tire point to the front of the car.
  • Page 58 Insert an axle pin into the hole in the stub axle. Slide the wheel hex onto the stub axle so that the slot in the hex hub engages the pin in the stub axle. hex nut Install the wheel over the hex hub (noting the tread direction) and secure it with a 4mm flange nut.
  • Page 59 Attach the rear body posts to the rear shock tower as shown. Do not over-tighten the clamp screws into the shock tower. Locate the foam bumper, two body washers, and two body clips. Slide the foam bumper over the front body posts and secure it with the body washers and clips.

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Nitro 4-tec pro 4801