INSTRUCTION FOR XT4'23 MANUAL EDITION
BEFORE YOU START This is a high-competition, high-quality RC car intended for persons aged 16 years and older with previous experience building and operating RC model racing cars. This is not a toy; it is a precision racing model. This model racing car is not intended for use by beginners, inexperienced customers, or by children without direct supervision of a responsible, knowledgeable adult.
IMPORTANT NOTES – ELECTRICAL • Insulate any exposed electrical wiring (using heat shrink tubing or electrical tape) to prevent dangerous short circuits. Take maximum care in wiring, connecting and insulating cables. Make sure cables are always connected securely. Check connectors for if they become loose. And if so, reconnect them securely. Never use RC models with damaged wires. A damaged wire is extremely dangerous, and can cause short-circuits resulting in fire.
TOOLS REQUIRED Allen 1.5mm (#111545 - HUDY EXCLUSIVE Limited Edition) Combination Pliers (HUDY #189020) Allen 2.0mm (#112045 - HUDY EXCLUSIVE Limited Edition) Arm Reamer 3.0mm (#107643 - HUDY EXCLUSIVE Limited Edition) Side Cutters (HUDY #189010) Socket 5.5mm (#175535 - HUDY EXCLUSIVE Limited Edition) Socket 7.
NOT INCLUDED Follow Set-Up Book: To ensure that you always have access to the most up-to-date version of the Set-up Book you can download the HUDY Set-up Book from their web site at [www.hudy. net] By offering this online version instead of including a hardcopy printed version in kits, you will always be assured of having the most current updated version.
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1. FRONT & REAR DIFFERENTIAL 2x Front diff OIL Silicone oil 30.000cSt Fill just above the cross-pins. 964031 S 3.5x10x0.2 PROPER AMOUNT OF OIL IN THE DIFFS Use a digital scale to measure the exact amount of oil in the diff. Remember that during operation the diff gets hotter and the heat may allow the oil to expand. If there is too much oil inside it may interfere with the diff operation and damage the internal gears. Rear diff Silicone oil 10.000cSt Fill just above the cross-pins.
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1. GEAR CENTER DIFFERENTIAL Center diff OIL Silicone oil 100.000cSt Fill just above the cross-pins. 964031 S 3.5x10x0.2 PROPER AMOUNT OF OIL IN THE DIFFS Use a digital scale to measure the exact amount of oil in the diff. Remember that during operation the diff gets hotter and the heat may allow the oil to expand. If there is too much oil inside it may interfere with the diff operation and damage the internal gears. Fill differential up to the top of the diff cross-pins.
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2. FRONT CENTRAL TRANSMISSION NOTE ORIENTATION ➌ 902305 ANGLED HUB 3 DOTS SH M3x5 ➋ ➊ OIL NOTE ORIENTATION 8x14x4mm Bearing Oil (HUDY #106230) GRAPHITE GREASE (HUDY #106210) ➍ 5x10x4mm Bearing with BLUE rubber covers 940510 OIL DETAIL ➎ NOTE ORIENTATION THREAD LOCK BB 5x10x4 ➏ DETAIL 940815 DIRT 981208 REAR BEVEL DRIVE GEAR & DIFFERENTIAL HEIGHT ADJUSTMENT BB 8x14x4 P 2x8 3 DOTS ANGLED HUB EXTREME WARNING 3 DOTS LOWEST 3 DOTS=3 DOTS INITIAL SETTING BEVEL GEAR ADJ.
3. REAR SUSPENSION 903312 363325 362315 367210 363316 362315 902308 306219 362478 903312 901304 323112-M 362006 901303 303431-K 303454 901308 303454 ANTI-ROLL BARS #362470 1.0mm OPTION #362471 1.1mm OPTION #362472 1.2mm OPTION #362473 1.3mm OPTION REAR SUSPENSION ARMS #323112-M MEDIUM INCLUDED #323112-H HARD OPTION #362474 1.4mm OPTION #362476 1.6mm OPTION #362478 1.8mm INCLUDED #323112-G GRAPHITE OPTION BAG 14 303431-K 303454 306219 323112-M 362006 362315 362478 363316 363325 ALU 4.
3. REAR SUSPENSION REAR SUSPENSION ARMS 306219 SHIM 3x6x2 #323112-M MEDIUM INCLUDED #323112-H HARD OPTION #323112-G GRAPHITE OPTION ➍ 903312 ➌ RR SFH M3x12 ➊ ➋ INITIAL SETTING 0.5° 1° NOTE ORIENTATION 3x6x2mm ➌RF ➊ ➍ INITIAL SETTING 0.5° 1° NOTE ORIENTATION DETAIL If the suspension arm does not move freely use a HUDY Arm Reamer to size the holes of the arms . Check for free movement. Arm Reamer 3.
3. REAR SUSPENSION 2x L=R 901308 SB M3x8 DETAIL 1.5mm 4mm ANTI-ROLL BARS 901303 SB M3x3 901304 SB M3x4 902308 SH M3x8 #362470 1.0mm OPTION #362471 1.1mm OPTION #362472 1.2mm OPTION #362473 1.3mm OPTION #362474 1.4mm OPTION #362476 1.6mm OPTION #362478 1.8mm INCLUDED #362480 2.0mm OPTION STEP ➌ DETAIL DETAIL L=R 0mm 3x3mm ➌ ➋ 1.8mm ➊ 3x4mm 3x8mm DETAIL Step ➊ check for free movement.
3. FRONT SUSPENSION 903312 362323 367210 362315 362313 303121-K 306219 362315 903312 902308 361201 322112-M 901303 362478 303431-K 901308 303454 303454 901304 362006 902308 ANTI-ROLL BARS #362470 1.0mm OPTION #362471 1.1mm OPTION #362472 1.2mm OPTION #362473 1.3mm OPTION #362474 1.4mm OPTION #362476 1.6mm OPTION SUSPENSION ARMS #362478 1.8mm INCLUDED #322112-M MEDIUM #362480 2.
3. FRONT SUSPENSION SUSPENSION ARMS #322112-M MEDIUM 303121-K DETAIL INCLUDED #322112-G GRAPHITE OPTION SHIM 3x6x0.5 Check for free movement. 306219 SHIM 3x6x1 ➍ 306219 SHIM 3x6x2 ➌ FR NOTE ORIENTATION ➊ ➋ INITIAL SETTING 903312 1º SFH M3x12 0.5º 0º 0.5º 3x6x0.5mm 3x6x1mm 1º 3x6x2mm (2x) Composite eccentric bushings ➌ FF ➍ ➊ NOTE ORIENTATION INITIAL SETTING 1º 0.5º 0º 0.
3. FRONT SUSPENSION 2x L=R 901308 DETAIL SB M3x8 1.5mm 4mm 902308 SH M3x8 STEP ➌ DETAIL 901303 L=R SB M3x3 0mm ANTI-ROLL BARS DETAIL 901304 SB M3x4 3x3mm ➌ 902308 SH M3x8 NOTE ORIENTATION #362470 1.0mm OPTION #362471 1.1mm OPTION #362472 1.2mm OPTION #362473 1.3mm OPTION #362474 1.4mm OPTION #362476 1.6mm OPTION #362478 1.8mm INCLUDED #362480 2.0mm OPTION NOTE ORIENTATION ➋ ➊ 3x4mm 3x8mm DETAIL DETAIL Step ➊ check for free movement.
4. REAR TRANSMISSION 302665 362651 363520 322612 902310 960030 302665 362651 980210 362280 980210 325315 323382 962030 962031 323354-H 325340 362316 902205 365230 941014 902312 940513 365360 902254 306219 327321 #325341 REAR ADJUSTABLE DRIVE AXLE LB - HUDY SPRING STEEL™ + 325390 ALU SHIM 10x12x2MM (2) #323381 ALU REAR HUB PLATE FOR MULTI ADJ.
4. REAR TRANSMISSION 2x L=R 980210 P 2x10 DRIVE SHAFT (94mm) NOTE ORIENTATION ➌ #325341 REAR ADJUSTABLE DRIVE AXLE LB - HUDY SPRING STEEL™ + 325390 ALU SHIM 10x12x2MM (2) ➊ ➋ #106210 HUDY GRAPHITE GREASE #106213 HUDY JOINT GREASE - OPTION LONG AXLE 2x L=R WHEEL HUBS 12MM ➌ Use HUDY Ball-Bearing Grease #106220 - STANDARD #106221 - BLUE #106222 - RED 940513 BB 5x12x4 ➍ ➊ ➏ 10x15x4mm ➋ 941014 BB 10x15x4 980210 P 2x10 #365360 +4.5mm 6 slots INCLUDED #365359 +3.
4. REAR TRANSMISSION 306219 Use 0.1mm or 0.3mm shim to adjust the play. SHIM 3x6x2 LONGER WHEELBASE (INITIAL SETTING) Adjustment Shim IN FRONT OF HUB moves hub rearward. ARM 3x6x0.1mm 902254 SH M2.5x4 3x6x0.3mm 962030 S 3x6x0.3 3x6x2mm 962031 DETAIL S 3x6x0.1 TIGHTEN GENTLY Check for free movement SHORTER WHEELBASE Adjustment Shim BEHIND HUB moves hub forward. ARM TIGHTEN GENTLY WHEELBASE 2x L=R NOTE ORIENTATION 8mm THREAD 59.
4. FRONT TRANSMISSION 302665 ALU NUTS M3 #296530-B BLUE #296530-K BLACK OPTION #296530-O ORANGE OPTION #960031 SILVER OPTION 362651 OPTION 322611 960030 902314 WHEEL HUBS 12MM 302665 #365360 +4.5mm 6 SLOTS OPTION #365359 +3.75mm 5 SLOTS OPTION 980210 980210 362652 #365358 +3.0mm 4 SLOTS OPTION 362280 #365357 +2.25mm 3 SLOTS OPTION #365356 +1.5mm 2 SLOTS INCLUDED 362210-H 325317 365240 359050 365230 #365355 +0.75mm 1 SLOT OPTION #365353 0mm 0 SLOTS INCLUDED #365354 -0.
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4. FRONT TRANSMISSION 2x 902254 SH M2.5x4 Check for free movement. L=R TIGHTEN GENTLY TIGHTEN GENTLY L=R (HUDY #107633) ARM REAMER If the C-hub does not move freely, use a HUDY Arm Reamer to resize the hole. 2x 52mm L=R 8mm THREAD THREAD THREAD 2x L=R Install the pivot balls with Professional Multi Tool (HUDY #183011). 10mm THREAD CAMBER 2x L=R NOTE ORIENTATION 362280 CON.
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4. FRONT & REAR ASSEMBLY #361271 CARBON FIBER CHASSIS SIDE GUARD L+R 903308 SFH M3x8 903310 SFH M3x10 960030 3x10mm N M3 ALU NUTS M3 3x8mm NOTE ORIENTATION OPTION #296530-K BLACK OPTION #296530-O ORANGE OPTION #960031 3x10mm CHASSIS FLEX #296530-B BLUE SILVER OPTION #361191 BRASS CHASSIS BRACE REAR (40g) 3x10mm 902310 SH M3x10 #361295 COMPOSITE CHASSIS BRACE REAR - MEDIUM 903306 SFH M3x6 903310 SFH M3x10 3x10mm Do not fully tighten the screws during assembly.
4. FRONT & REAR ASSEMBLY 902314 SH M3x14 After you mount the rear suspension assembly to the chassis, fully tighten all 4 screws that were previously left untightened (page 27 , step 2). 903310 SFH M3x10 DETAIL 902312 SH M3x12 903310 SFH M3x10 After you mount the front suspension assembly to the chassis, fully tighten all 3 screws that were previously left untightened (page 27, step 2).
4. FRONT & REAR ASSEMBLY #366161 Choose the diameter of O-ring to best eliminate play between the battery and post without being too tight. 6x5mm 902318 SH M3x18 6x4mm 6x3mm ORIENTATION FOR LOW BATTERY PACK 6x2mm Battery (NOT INCLUDED) 903310 SFH M3x10 ORIENTATION FOR STANDARD BATTERY PACK Hold the battery holder with Professional Multi Tool (HUDY #183011). (INITIAL SETTING) Select the battery mount position to match the battery pack length.
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5. STEERING THREAD LOCK 970100 O 10x1.5 INITIAL PRELOAD SETTING DETAIL OIL 1~2mm CLEANER SERVO SAVER NOTE ORIENTATION STEERING PLATE #362571 HARD INCLUDED #362571-G GRAPHITE OPTION #362575 ALU OPTION 902310 SH M3x10 Increases steering precision and predictability and is recommended for use in high-traction conditions. Includes extra Ackermann positions for very precise steering adjustment.
5. STEERING 903308 SFH M3x8 2x 50mm L=R THREAD Install the pivot balls with Professional Multi Tool (HUDY #183011). THREAD 2x L=R 303123 SHIM 3x6x2 NOTE ORIENTATION Adjustment block towards outside. 3x16mm 903316 2mm SFH M3x16 2mm view INITIAL POSITION DETAIL NOTE ORIENTATION Adjustment block towards outside. 3x18mm 903318 SFH M3x18 ACKERMANN BUMP STEER TOE-IN 32 Check for free movement. Check for free movement.
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7. SHOCK ABSORBERS PISTONS DETAIL 2 holes 2 holes (1.6mm) (1.7mm) Thick Shim 368010 2 holes 2 holes (1.6mm) (1.7mm) 0 holes (Create custom holes) (0mm - use required drill pin) 368260 363240 902205 Thick Shim Thin Shim 965023 368031 0 holes (Create custom holes) (0mm - use required drill pin) These pistons can NOT be used in shocks without making the custom holes by yourselves.
7. SHOCK ABSORBERS 4x ➋ ➌ 965023 There are two different thickness shims, use them as shown. Use the same procedure when building both front and rear shocks. ➊ C 2.3 FRO NT 2 holes (1.6mm) 970080 O 8x1 2x - SH ORT THICK Shim SHO CK R O-ring OD O-ring 972031 O 3x2.1 INITIAL PISTON SETTING THIN Shim 2 holes (1.7mm) 2x ➌ ➊ ➋ REA R- SHOCK DAMPING SHOCK PISTONS 306219 SHIM 3x6x2 LON G SHO CK R OD #306219 DOWNSTOP SHIMS IMPORTANT THICKER shim used, GREATER downstop is achieved.
7. SHOCK ABSORBERS IMPORTANT UP-STOP TRAVEL SETTINGS It is very important to have properly set the up-stop travel to avoid damage to the drive shaft and diff outdrives. UP-STOP SHIM To avoid collision of the drive shaft with diff outdrives use the up-stop travel shims to set-up the up-stop travel.
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8. FINAL ASSEMBLY SERVO LINK Adjust servo link to fit your servo. 28mm THREAD THREAD 6mm THREAD INITIAL SETTING Install the pivot balls with Professional Multi Tool (HUDY #183011). 6mm THREAD 3x6mm 902306 HUDY ALU SERVO HORNS #293497 23T #293498 24T #293499 25T NOTE ORIENTATION SH M3x6 Servo (NOT INCLUDED) 902308 SH M3x8 NOTE ORIENTATION 961032 3x8mm SHIM S 3.
8. FINAL ASSEMBLY Motor (NOT INCLUDED) NOTE ORIENTATION 902310 SH M3x10 ➌ NOTE ORIENTATION ➊ ➋ Pinion (NOT INCLUDED) PINIONS ➊ ➋ ➊ Loosen the screw. ➋ Insert motor into the bulkhead. ➊ Adjust gear mesh. ➋ Tighten the screw.
8. FINAL ASSEMBLY 903310 SFH M3x10 #107876 HUDY ULTRA THIN DOUBLESIDED TAPE - SINGLE STRIP (5) Speed Controller (NOT INCLUDED) #107875 DOUBLE-SIDED TAPE ANTENNA ALTERNATIVE (OPTION) Receiver (NOT INCLUDED) Antenna #306310 (NOT INCLUDED) Mount #306301 (NOT INCLUDED) #107876 HUDY ULTRA THIN DOUBLESIDED TAPE - SINGLE STRIP (5) #107875 DOUBLE-SIDED TAPE Remove nut. Install antenna mount.
8. FINAL ASSEMBLY Install STANDARD or LOW battery pack Battery (NOT INCLUDED) CUT Self-adhesive Foam Strip (#107871 HUDY) WING CUTTING LINE OPTIONS 903308 SFH M3x8 For LOWER traction tracks HIGHER Side line LOWER Side line (INITIAL POSITION) For HIGHER traction tracks SCISSORS (HUDY #188990) BODY REAMER (HUDY #107602) REAR WING SHIM #293561 SILVER OPTION #293561-O ORANGE OPTION #293561-K BLACK OPTION XRAY LEXAN REAR WINGS #323510 1.0mm OPTION #323511 1.5mm OPTION #323513 1.
8. FINAL ASSEMBLY ➊ Before cutting and making holes on the BODY, put the unpainted body on the chassis to confirm the mounting position and location for holes and cutouts. Before cutting and making holes on the WING, put the unpainted wing on the wing holders to confirm the mounting position and location for holes and cutouts. ➋ Before painting, wash the inside of the body with mild detergent, and then rinse and dry thoroughly. ➎ Paint the body using paints formulated for polycarbonate bodies.
8. FINAL ASSEMBLY 960240 N M4 Tires & Inserts (NOT INCLUDED) MAINTENANCE SHOCK MAINTENANCE The most important maintenance task for keeping consistent shock performance is refilling and bleeding them correctly. If built correctly, it will not be necessary to re-build them often. Replacing warped/hard o-rings, scarred piston rods, or shaved/split/loose composite upper and lower ball joints are also important.
199183 104004 108201 108205 108203 108204 106000 + 106036 109801 107701 108840 181090 107740 107742 181030 293110 46 104004 105500 105520 106000 106036 107090 107601 107701 107740 107742 107855 107880 HUDY AIR VAC - VACUUM PUMP - 1/10 OFF-ROAD HUDY UNIVERSAL TIRE BALANCING STATION WHEEL ADAPTER FOR 1/10 TOURING CARS - 12MM HUDY DRIVE PIN REPLACEMENT TOOL (FOR 3MM PINS) EJECTOR PIVOT PIN & ALTERNATING PIVOT 2.
199270 107855 109880 199060 298100 109840 108160 183011 105520 107090 107601 177035 105550 108960 175535 112045 108905 132045 109860 111545 107880 153055 108190 188990 109880 111545 112045 132045 153055 175535 177035 181030 181090 183011 188990 199060 HUDY ALU TRAY FOR ACCESSORIES & PIT LED LIMITED EDITION - ALLEN WRENCH # 1.5MM LIMITED EDITION - ALLEN WRENCH # 2.0MM LIMITED EDITION - ALLEN WRENCH + BALL REPL. TIP # 2.0MM LIMITED EDITION - SLOTTED SCREWDRIVER # 3.
RC AMERICA, 2030 Century Center Blvd #15, Irving, TX 75062, USA PHONE: 214-744-2400, FAX: 214-744-2401, xray@rcamerica.
