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Traxxas 4902 Owner's Manual
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Traxxas 4902 Owner's Manual

Traxxas 4902 Owner's Manual

T-maxx 2.5r
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MODEL 4902
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Summary of Contents for Traxxas 4902

  • Page 1 MODEL 4902 owners manual...
  • Page 2 T-Maxx 2.5R unlock the incredible performance and adjustment potential that Thank you again for going with Traxxas. We work hard every day to Troubleshooting Traxxas engineers designed into T-Maxx 2.5R. Even if you are an assure you the highest level of customer satisfaction possible.
  • Page 3 Warnings, helpful hints, & cross-references Internet Throughout this manual, you’ll notice warnings and helpful hints Traxxas offers a full-service, on-site repair facility to handle any of www.Traxxas.com identified by the icons below. Be sure to read them! your Traxxas service needs. Maintenance, replacement parts, and E-mail: support@Traxxas.com...
  • Page 4 Safety Precautions All of us at Traxxas want you to safely enjoy your new T-Maxx 2.5R. Do not operate your T-Maxx 2.5R at night, or anytime your line of sight Operate your T-Maxx 2.5R sensibly and with care, and it will be exciting, All instructions and to the model may be obstructed or impaired in any way.
  • Page 5 NiCad or NiMH NiCad or NiMH battery charger 12 AA alkaline batteries nose pliers see page 22 7.2V battery pack Traxxas part #3030X shown* Fuel dispensing bottle After-run oil to protect Small flat-blade screwdriver Hobby knife Philips screwdriver the engine from corrosion...
  • Page 6 Anatomy of Your T-Maxx 2.5R Fuel Cap Hex Hub Slipper Clutch Fuel Tank Two-Speed Access Plug Axle Carrier Suspension Arm Transmission Pivot Ball Fuel Line Battery Box Engine Shut-off Toe Link Clamp On/Off Switch (Turnbuckle) Spur Gear Shift Rod EZ-Start Motor Steering Servo Rear Bumper Shifting Servo...
  • Page 7 Quick Start: Getting up to Speed The following guide is an overview of the procedures for getting your T-Maxx 2.5R running, from opening the box to breaking in and tuning your engine. Refer to the pages indicated for details on each step. Look for the Quick Start logo on the bottom corners of Quick Start pages. The Quick Start Guide is not intended to replace 1.
  • Page 8 Gluing the Tires and Decorating your T-Maxx 2.5R Tire Gluing Applying The Decals The factory tires on your T-Maxx 2.5R are already glued to the rims. The The main decals have already been Always wear safety glasses to prevent glue from tires must be glued to the rims to prevent the rims from spinning inside applied to your T-Maxx 2.5R.
  • Page 9 The Traxxas TQ-3 Radio System Your T-Maxx 2.5R is equipped with the TQ-3 radio system. The TQ-3 is a 3-channel system that provides up to a quarter mile range and control for up to ™ three servo outputs. The TQ-3 works in conjunction with the OptiDrive Electronic Shift Module to monitor and control the input and output signals for the throttle and shifting servos (channels).
  • Page 10 Frequency band - The radio frequency used by the transmitter to send Trim - The fine-tuning adjustment of the neutral position of the servos, signals to your T-Maxx 2.5R. All Traxxas RTR models operate on a 27 made by turning the throttle and steering trim knobs on the face of MHz frequency band.

  • Page 11: Installing Transmitter Batteries

    The Traxxas TQ-3 Radio System Installing Transmitter Batteries Your TQ-3 transmitter uses 8 AA batteries. The battery compartment is Use the Right Batteries located in the base of the transmitter. Your transmitter uses AA batteries. Use new alkaline batteries, or rechargeable...
  • Page 12 To prevent losing control of your model, it is important to stop at the Traxxas' integrated TRX Power System is the easiest way to add the first sign of weak receiver batteries. Visible warning signals include power and economy of rechargeable batteries to your T-Maxx 2.5R.
  • Page 13 The Traxxas TQ-3 Radio System Setting up the Antenna Antenna Tip 1. Locate the black antenna wire that exits the top Spray a little window of the receiver box. Antenna Sleeve cleaner on the antenna wire to make it easier 2.
  • Page 14 The Traxxas TQ-3 Radio System TQ-3 Radio System Controls TQ-3 Radio System Adjustments In addition to the electronic throttle and steering trim controls, your radio system features throttle neutral adjustment and servo reversing switches. Throttle Neutral Adjustment Steering The throttle neutral adjustment is located on the transmitter face and controls the forward/reverse travel of the throttle trigger.
  • Page 15 The Traxxas TQ-3 Radio System Servo Reversing Switches 2. Set the TQ-3 Transmitter to its factory default shift settings: The servo reversing switches are located on the front of the transmitter, Set the THROTTLE NEUTRAL switch to the 50/50 setting.
  • Page 16 The Traxxas TQ-3 Radio System TQ-3 Radio System Rules Always have the transmitter and receiver turned on before you start Remember, always turn the the engine. Never turn the radio system off while the engine is Each time you prepare to run your T-Maxx TQ-3 transmitter on first and running.
  • Page 17 The Traxxas TQ-3 Radio System Using the TQ-3 Radio System 7. Operate the shift button on the transmitter and check for rapid The TQ-3 Radio System was pre-adjusted at the factory. The adjustment When the engine is running, operation of the shifting servo. Push the shift button down for should be checked before running the model, in case of movement don’t use the throttle trim...
  • Page 18 The TRX 2.5R Racing Engine Introduction Traxxas strongly There’s nothing like the TRX 2.5R Racing Engine in your new T-Maxx 2.5R. discourages changing or The TRX 2.5R Racing Engine is a specialty high-performance racing modifying any part of the engine. Its impressive performance is the result of years of focused TRX 2.5R Racing Engine.
  • Page 19 The TRX 2.5R Racing Engine Glow Plug TRX 2.5R Racing Engine Illustrated Air Filter Housing Head Protector Idle Speed Screw PowerTune ™ Head (Cylinder Head) EZ-Start ™ Drive Unit ™ EZ-Start Motor High-Speed Needle Low-Speed Needle Fuel Intake Air Intake Engine Mount Carburetor Crankcase...
  • Page 20 EZ-Start - Traxxas on-board electric starting system. The system consists of without the air filter in place. a hand held starter control unit and an on-board gearbox with an electric BDC - Bottom dead center.
  • Page 21 High-speed needle (HSN) - Adjusts the carburetors fuel/air mixture at the tank. On a Traxxas model this is done by holding your finger over high throttle openings.
  • Page 22 When using Traxxas Top Fuel, using higher nitro percentages does not Traxxas Top Fuel is made with just the right balance of the highest Follow fuel label warnings. cause the engine to wear out faster. 33% Top Fuel contains the same grade natural and synthetic lubricants to allow excellent throttle quality lubrication package as 10 and 20% Top Fuel.
  • Page 23 5. Oil the foam element with foam filter oil. Use the supplied Traxxas filter The Air Filter oil (part# 5263) or a high-quality, special-purpose foam filter oil like The TRX 2.5R Racing Engine air filter is specifically designed to deliver...
  • Page 24 The TRX 2.5R Racing Engine molecules) to maintain the correct air/fuel ratio. Warmer air is less dense The Carburetor (fewer air molecules) and therefore needs less fuel to maintain the Understanding the Carburetor adjustments See page 32 for more correct air/fuel ratio. The tuning needles are there to adjust how much information on how The carburetor performs several functions.
  • Page 25 The TRX 2.5R Racing Engine Slightly lean fuel mixtures deliver stronger, more efficient Richen See Tuning Your TRX 2.5R Water Valve combustion and more power, but with less lubrication. Racing Engine on page 31 (Controls Overall Flow) for complete information on High Speed Needle adjusting the air/fuel Slightly rich fuel mixtures deliver cooler running and more...
  • Page 26 The Traxxas EZ-Start ™ Electric Starting System Use the Right Charger The Traxxas EZ-Start brings the convenience of push-button electric Installing the EZ-Start Battery The most convenient type engine starting to your T-Maxx 2.5R. The EZ-Start consists of a hand-held The EZ-Start system requires a fully charged 7.2-volt rechargeable NiCad...
  • Page 27 The TRX 2.5R Racing Engine Using the EZ-Start off the power to the motor. Allow at least 3 minutes for the starter motor Your EZ-Start controller plugs into a 4-prong receptacle in the center of When the EZ-Start to cool and the circuit to automatically reset before continuing. Use the the bed on your T-Maxx 2.5R.
  • Page 28 The TRX 2.5R Racing Engine Breaking in Your TRX 2.5R Racing Engine Keep extra Traxxas glow plugs handy. The break-in process can cause See Important Points to The TRX 2.5R Racing Engine uses a ringless, aluminum-brass-chrome (ABC) deposits to form on the plug leading to plug failure.
  • Page 29 3. When the fuel tank is nearly empty, shut off the engine and let it cool 2. The model should now be shifting into second gear. If it is not, try Traxxas break-in procedure. for 15 minutes. Other break-in procedures...
  • Page 30 The TRX 2.5R Racing Engine Winter Break-in Tips For owners that do not have access to a temperature probe, a drop of During the break-in process, the piston and sleeve wear into each other water on the cooling head (around the glow plug area) should slowly to form a precise fit.
  • Page 31 The TRX 2.5R Racing Engine 3. There is a sudden loss of power during acceleration (Danger!). Tuning Your TRX 2.5R Racing Engine 4. The engine begins to overheat. Symptoms of overheating include: The engine’s performance depends on the fuel mixture. Turn the mixture When tuning for Steam or smoke coming from the engine (not exhaust).
  • Page 32 The TRX 2.5R Racing Engine Low-Speed Fuel Mixture Adjustment Idle Speed Adjustment The low-speed mixture is always set after the high-speed needle is Once the high and low-speed mixtures have been set, reduce the idle When adjusting the low correctly adjusted. The low-speed mixture is set using the pinch test. speed to the minimum reliable idle speed.
  • Page 33 (Traxxas tune based on how it sounds and performs (always with a visible stream on-board digital temperature gauge, part of blue smoke coming from the exhaust).
  • Page 34 If it will not shift, then refer to the troubleshooting very fast and responsive and is intended for experienced drivers. Do section on www.Traxxas.com or call Traxxas support. not drive over the limits of your reflexes and ability. Drive with...
  • Page 35 Tuning Adjustments We recommend using two-hole pistons with a Suspension Tuning range of oil viscosities from 10W to 40W Adjusting the Pivot Ball Caps (available from your hobby shop). The thinner For easier access to the The pivot ball caps should be adjusted rear-most shock mounting viscosity oils (30W or less) flow with less screw, remove the one end...
  • Page 36 Traxxas Maxx Truck. Use the chart below to see the effect of the various shock mounting Spring rate (at the wheel) increases as the lower shock mounting position positions.
  • Page 37 Tuning Adjustments Alignment Settings Transmission Tuning Adjusting the Slipper Clutch Adjusting the Toe-in All of the toe links are Your T-Maxx 2.5R is equipped with an Your T-Maxx 2.5R comes from the factory installed on the truck so that adjustable Torque Control slipper the left hand thread with zero degrees of toe-in in the front, clutch.
  • Page 38 Tuning Adjustments Adjusting the Two-Speed Transmission Adjusting the Spur Gear/Clutch Bell Gear Mesh T-Maxx 2.5R comes equipped with an adjustable two-speed transmission. The ideal spur gear/clutch bell gear mesh Two Speed Adjustment When the shift point on the transmission is adjusted correctly, it will for T-Maxx 2.5R is 0.1mm.
  • Page 39 This requires transmission removal transmission’s front output shaft. The brake is preset at the factory and and disassembly (see www.Traxxas.com for detailed instructions). The should not require attention. As the brake material wears, future close ratio gearsets will reduce top speed slightly but will provide more adjustments may be necessary.
  • Page 40 The cleanliness and condition of your Slipper clutch pads (friction Traxxas Lifetime Engine air filter directly influences the running life span of your engine. Do not material): Under normal use, the Replacement Plan (ERP).
  • Page 41 Maintaining and Storing Your T-Maxx 2.5R After-run Procedure 7. Connect the EZ-Start controller to the model and spin the engine for You must perform after-run maintenance on your TRX 2.5R Racing Engine Denatured alcohol 10 seconds. whenever the model will be stored for longer than a few hours. Taking (available from home the time to prepare your engine for storage will reward you with longer centers and paint supply...
  • Page 42 “batt” terminal The contents of different brands of fuel (other than Traxxas Top Fuel) in on the receiver (you will have to remove the receiver cover). Make sure...
  • Page 43 Try a new Traxxas glow plug. Sometimes a glow plug will work well viewed from the front. The flywheel should enough to start the engine but not be able to deliver the engine’s full turn, unsticking the piston from the sleeve.
  • Page 44 Index ABC 20 Bulkhead 6 head protector 19 Address 3 Bumper 6 header 21 mount 19 After-run procedure 41 Bumper Mount 6 piston 21, 40 Air density 33 Camber 37 port 21 Air filter 5, 6, 20, 23 Carburetor 19, 20, 24 cleaning 23 air intake 19 shut-off clamp 6, 19, 27...
  • Page 45 Index Gear Ratio 38 range 9 controls 14 Glow plug 19, 20 range testing 17 installing batteries 11 driver 20 rules 16 power indicator 9 terminology 10 power switch 9 fouled 28 using 17 servo reversing switch 9 igniter 26 Receiver 9, 10 steering wheel 9 Hex Hub 6...
  • Page 48 MODEL 4902 1 100 Klein Road, Plano Texas 75074 1-888-TRAXXAS 060215 Part#5197...

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T-maxx 2.5r 4902