Xray XT4 Instruction Manual

INSTRUCTION MANUAL

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. If
you do not fulfill these requirements, please return the kit in unused and
unassembled form back to the shop where you have purchased it.

Before building and operating your XRAY, YOU MUST read through all of the
operating instructions and instruction manual and fully understand them to
get the maximum enjoyment and prevent unnecessary damage.

CUSTOMER SUPPORT

We have made every effort to make these instructions as easy to understand as
possible. However, if you have any difficulties, problems, or questions, please do not
hesitate to contact the XRAY support team at [e-mail]. Also, please visit
our Web site at www.teamxray.com to find the latest updates, set-up information,
option parts, and many other goodies. We pride ourselves on taking excellent care
of our customers.

You can join thousands of XRAY fans and enthusiasts in our online community at:

www.teamxray.com

FAILURE TO FOLLOW THESE INSTRUCTIONS WILL BE CONSIDERED AS ABUSE AND/OR NEGLECT.

SAFETY PRECAUTIONS

Contains:
LEAD (CAS 7439-92-1) ANTIMONY (CAS 7440-36-0)
WARNING: This product contains a chemical known to the state of California
to cause cancer and birth defects or other reproductive harm.
CAUTION: CANCER HAZARD
Contains lead, a listed carcinogen. Lead is harmful if ingested. Wash
thoroughly after using. DO NOT use product while eating, drinking or using
tobacco products. May cause chronic effects to gastrointestinal tract, CNS,
kidneys, and blood. MAY CAUSE BIRTH DEFECTS.

When building, using and/or operating this model always wear protective
glasses and gloves.

Take appropriate safety precautions prior to operating this model. You are
responsible for this model‘s assembly and safe operation! Please read the
instruction manual before building and operating this model and follow all
safety precautions. Always keep the instruction manual at hand for quick

Read carefully and fully understand the instructions before beginning
assembly.

Make sure you review this entire manual, download and use set-up book from
the web, and examine all details carefully. If for some reason you decide this
is not what you wanted or expected, do not continue any further. Your hobby
dealer can not accept your kit for return or exchange after it has been partially
or fully assembled.

Contents of the box may differ from pictures. In line with our policy of
continuous product development, the exact specifications of the kit may vary
without prior notice.

XRAY Europe

K Vystavisku 6992
91101 Trenčín
Slovakia, EUROPE
Phone: [phone]
Fax: [phone]
E-mail: [e-mail]

reference, even after completing the assembly. Use only genuine and original
authentic XRAY parts for maximum performance. Using any third party parts
on this model will void guaranty immediately.

Improper operation may cause personal and/or property damage. XRAY
and its distributors have no control over damage resulting from shipping,
improper construction, or improper usage. XRAY assumes and accepts no
responsibility for personal and/or property damages resulting from the use
of improper building materials, equipment and operations. By purchasing
any item produced by XRAY, the buyer expressly warrants that he/she is in
compliance with all applicable federal, state and local laws and regulation
regarding the purchase, ownership and use of the item. The buyer expressly
agrees to indemnify and hold harmless XRAY for all claims resulting directly
or indirectly from the purchase, ownership or use of the product. By the act
of assembling or operating this product, the user accepts all resulting liability.
If the buyer is not prepared to accept this liability, then he/she should return
this kit in new, unassembled, and unused condition to the place of purchase.

XRAY USA

RC America, 2030 Century Center Blvd #15
Irving, TX 75062
USA
Phone: [phone]
Fax: [phone]
E-mail: [e-mail]

IMPORTANT NOTES – GENERAL

• This product is not suitable for children under 16 years of age without the
direct supervision of a responsible and knowledgeable adult.

• Carefully read all manufacturers warnings and cautions for any parts used
in the construction and use of your model.

• Assemble this kit only in places away from the reach of very small children.

• First-time builders and users should seek advice from people who have
building experience in order to assemble the model correctly and to allow
the model to reach its performance potential.

• Exercise care when using tools and sharp instruments.

• Take care when building, as some parts may have sharp edges.

• Keep small parts out of reach of small children. Children must not be
allowed to put any parts in their mouth, or pull vinyl bag over their head.

• Read and follow instructions supplied with paints and/or cement, if used
(not included in kit).

• Immediately after using your model, do NOT touch equipment on the
model such as the motor and speed controller, because they generate high
temperatures. You may seriously burn yourself seriously touching them.

• Follow the operating instructions for the radio equipment at all times.

• Do not put fingers or any objects inside rotating and moving parts, as this
may cause damage or serious injury as your finger, hair, clothes, etc. may
get caught.

• Be sure that your operating frequency is clear before turning on or running
your model, and never share the same frequency with somebody else at the
same time. Ensure that others are aware of the operating frequency you
are using and when you are using it.

• Use a transmitter designed for ground use with RC cars. Make sure that no
one else is using the same frequency as yours in your operating area. Using
the same frequency at the same time, whether it is driving, flying or sailing,
can cause loss of control of the RC model, resulting in a serious accident.

• Always turn on your transmitter before you turn on the receiver in the car.
Always turn off the receiver before turning your transmitter off.

• Keep the wheels of the model off the ground when checking the operation
of the radio equipment.

• Disconnect the battery pack before storing your model.

• When learning to operate your model, go to an area that has no obstacles
that can damage your model if your model suffers a collision.

• Remove any sand, mud, dirt, grass or water before putting your model
away.

• If the model behaves strangely, immediately stop the model, check and
clear the problem.

• To prevent any serious personal injury and/or damage to property, be
responsible when operating all remote controlled models.

• The model car is not intended for use on public places and roads or areas
where its operation can conflict with or disrupt pedestrian or vehicular traffic.

• Because the model car is controlled by radio, it is subject to radio
interference from many sources that are beyond your control. Since radio
interference can cause momentary loss of control, always allow a safety
margin in all directions around the model in order to prevent collisions.

• Do not use your model:

- Near real cars, animals, or people that are unaware that an RC car is being
driven.

- In places where children and people gather

- In residential districts and parks

- In limited indoor spaces

- In wet conditions

- In the street

- In areas where loud noises can disturb others, such as hospitals and
residential areas.

- At night or anytime your line of sight to the model may be obstructed or
impaired in any way.

To prevent any serious personal injury and/or damage to property, please be
responsible when operating all remote controlled models.

2

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. Please
have wires repaired at your local hobby shop.

• Low battery power will result in loss of control. Loss of control can occur due
to a weak battery in either the transmitter or the receiver. Weak running
battery may also result in an out of control car if your car‘s receiver power is
supplied by the running battery. Stop operation immediately if the car starts
to slow down.

• When not using RC model, always disconnect and remove battery.

• Do not disassemble battery or cut battery cables. If the running battery
short-circuits, approximately 300W of electricity can be discharged, leading
to fire or burns. Never disassemble battery or cut battery cables.

• Use a recommended charger for the receiver and transmitter batteries
and follow the instructions correctly. Over-charging, incorrect charging,

R/C & BUILDING TIPS

or using inferior chargers can cause the batteries to become dangerously
hot. Recharge battery when necessary. Continual recharging may damage
battery and, in the worst case, could build up heat leading to fire. If battery
becomes extremely hot during recharging, please ask your local hobby
shop for check and/or repair and/or replacement.

• Regularly check the charger for potential hazards such as damage to the
cable, plug, casing or other defects. Ensure that any damage is rectified
before using the charger again. Modifying the charger may cause short­circuit or overcharging leading to a serious accident. Therefore do not
modify the charger.

• Always unplug charger when recharging is finished.

• Do not recharge battery while battery is still warm. After use, battery retains
heat. Wait until it cools down before charging.

• Do not allow any metal part to short circuit the receiver batteries or other
electrical/electronic device on the model.

• Immediately stop running if your RC model gets wet as may cause short
circuit.

• Please dispose of batteries responsibly. Never put batteries into fire.

• Make sure all fasteners are properly tightened. Check them periodically.

• Make sure that chassis screws do not protrude from the chassis.

• For the best performance, it is very important that great care is taken to
ensure the free movement of all parts.

• Clean all ball-bearings so they move very easily and freely.

• Tap or pre-thread the plastic parts when threading screws.

• Self-tapping screws cut threads into the parts when being tightened. Do
not use excessive force when tightening the self-tapping screws because
you may strip out the thread in the plastic. We recommended you stop
tightening a screw when you feel some resistance.

• Ask your local hobby shop for any advice.

WARRANTY

XRAY guarantees this model kit to be free from defects in both material and
workmanship within 30 days of purchase. The total monetary value under
warranty will in no case exceed the cost of the original kit purchased. This
warranty does not cover any components damaged by use or modification
or as a result of wear. Part or parts missing from this kit must be reported
within 30 days of purchase. No part or parts will be sent under warranty
without proof of purchase. Should you find a defective or missing part, contact
the local distributor. Service and customer support will be provided through
local hobby store where you have purchased the kit, therefore make sure to
purchase any XRAY products at your local hobby store. This model racing car
is considered to be a high-performance racing vehicle. As such this vehicle
will be used in an extreme range of conditions and situations, all which may
cause premature wear or failure of any component. XRAY has no control over
usage of vehicles once they leave the dealer, therefore XRAY can only offer
warranty against all manufacturer‘s defects in materials, workmanship, and
assembly at point of sale and before use. No warranties are expressed or
implied that cover damage caused by what is considered normal use, or cover
or imply how long any model cars‘ components or electronic components will
last before requiring replacement.

Due to the high performance level of this model car you will need to
periodically maintain and replace consumable components. Any and all
warranty coverage will not cover replacement of any part or component
damaged by neglect, abuse, or improper or unreasonable use. This includes

Please support your local hobby shop. We at XRAY Model Racing Cars support
all local hobby dealers. Therefore we ask you, if at all possible, to purchase
XRAY products at your hobby dealer and give them your support like we do.
If you have difficulty finding XRAY products, please check out www.teamxray.
com to get advice, or contact us via email at [e-mail], or contact
the XRAY distributor in your country.

but is not limited to damage from crashing, chemical and/or water damage,
excessive moisture, improper or no maintenance, or user modifications which
compromise the integrity of components. Warranty will not cover components
that are considered consumable on RC vehicles. XRAY does not pay nor refund
shipping on any component sent to XRAY or its distributors for warranty. XRAY
reserves the right to make the final determination of the warranty status of
any component or part.

Limitations of Liability

XRAY makes no other warranties expressed or implied. XRAY shall not be liable
for any loss, injury or damages, whether direct, indirect, special, incidental,
or consequential, arising from the use, misuse, or abuse of this product and/
or any product or accessory required to operate this product. In no case shall
XRAY‘s liability excess the monetary value of this product.

Take adequate safety precautions prior to operating this model. You
are responsible for this model’s assembly and safe operation.

Disregard of the any of the above cautions may lead to accidents,
personal injury, or property damage. XRAY MODEL RACING CARS
assumes no responsibility for any injury, damage, or misuse of this
product during assembly or operation, nor any addictions that may
arise from the use of this product.
All rights reserved.

QUALITY CERTIFICATE

XRAY MODEL RACING CARS uses only the highest quality materials, the
best compounds for molded parts and the most sophisticated manufacturing
processes of TQM (Total Quality Management). We guarantee that all parts
of a newly-purchased kit are manufactured with the highest regard to quality.
However, due to the many factors inherent in model racecar competition, we

cannot guarantee any parts once you start racing the car. Products which have
been worn out, abused, neglected or improperly operated will not be covered
under warranty.
We wish you enjoyment of this high-quality and high-performance RC car and
wish you best success on the track!

In line with our policy of continuous product development, the exact specifications of the kit may
vary. In the unlikely event of any problems with your new kit, you should contact the model shop
where you purchased it, quoting the part number.
We do reserve all rights to change any specification without prior notice. All rights reserved.

3

SYMBOLS USED

Part bags used Assemble left and

Assemble in the

specified order

right sides the

same way

05

Apply greaseScale Ensure smooth

Optional

1:1

TOOLS REQUIRED

Scissors

(HUDY #188990)

Special Tool for
turnbuckles & nuts
(HUDY #181090)

L=R

parts

Turnbuckle Wrench

3mm (HUDY #181030)

3.0 mm

Pay attention

here

non-binding

movement

Pocket Hobby Knife

Assemble as many

(HUDY #188981)

times as specified

(here twice)

2x

Tighten screw

gently

threadlock

Completed

assembly

Side Cutters

(HUDY #189010)

Apply

TL

Apply CA glue

Detail

DETAIL

Combination Pliers

(HUDY #189020)

Apply oil

CA

Professional Multi Tool

OIL

Apply cleaner

(HUDY #183011)

Tweezer

HUDY TOOLS:

Allen 1.5mm

Allen 2.0mm

Socket 5.5mm

Socket 7.0mm

Arm Reamer 3.0mm

Reamer (HUDY #107600) or (HUDY #107601)

ITEMS INCLUDED

HUDY Premium Silicone Oils HUDY Premium Silicone Oils HUDY Premium Silicone OilsHUDY Premium Silicone OilsHUDY Premium Silicone Oils Graphite Grease

Oil 450cSt (#106345) Oil 650cSt (#106365) Oil 100.000cSt (#106610)Oil 30.000cSt (#106530)Oil 10.000cSt (#106510)

(HUDY #106210)

EQUIPMENT REQUIRED

Transmitter Steering ServoReceiver

Electric Motor &

Pinion Gear with Set-screw

Bearing Oil

(HUDY #106230)

CA glue

Speed Controller LiPo Battery

4

Lexan™ Paint Battery Charger Tires & Inserts

Double-sided Tape
(HUDY #107875)

NOT INCLUDED

Set-up Book

To ensure that you always have access to the most up-to-date version of the HUDY Set-up
Book, you can download it from the HUDY website 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.

XRAY offers wide range of optional tuning parts which are listed in tables
like these. Please refer to the exploded view of each main section to verify
which part is included in the kit while all other parts are available only as an
optional part and must be purchased separately.

COLOR INDICATIONS

At the beginning of each section is an exploded view of the parts to be assembled.
There is also a list of all the parts and part numbers that are related to the assembly
of that section.

The part descriptions are color-coded to make it easier for you to identify the source
of a part. Here are what the different colors mean:

XB4 TECH TIPS

SAMPLE OF OPTIONAL PARTS

#32XXXX TYPE OPTION 1
#32XXXX TYPE OPTION 2
#32XXXX TYPE INCLUDED
#32XXXX TYPE OPTION 3

364910

361105

364902

STYLE A - indicates parts that are included in the bag marked for the section.

STYLE B - indicates parts that are included in the box.

STYLE C - indicates parts that are already assembled from previous steps.

TIP

DRIVE SHAFT PIN SERVICING

To enjoy the longest possible lifespan of the drive shafts and diff outdrives, it is extremely important to properly service the drive shaft pins.
Inspect the pins after every 3 hours of runtime. If the pins show any wear, replace them with new pins.

Do not use drive shafts
when the pins are worn.

TIP

GRAPHITE PARTS PREPARATION

Follow this Tech Tip to prepare the graphite parts. Sand the edges with sandpaper, and then seal the edges with CA glue to reinforce them and help prevent delamination.

Prepare all XT4 Graphite Parts:

• Front shock tower

• Rear shock tower

Press out the worn pins.

Press in new pins and
regularly inspect for wear.

Fine sandpaper

Use fine sandpaper to
sand smooth the edges of
all graphite parts.

For quick & easy drive pin replacements use
#106000 HUDY Drive Pin Replacement Tool
together with #106036 Ejector Pivot Pin &
Alternating Pivot 2.5mm.

Apply CA glue to all edges
of the graphite parts.

To replace the worn pins use only
premium HUDY drive pins
(#106051 3.0mm dia x 10mm lenght)
(#106053 2.5mm dia x 10mm lenght)

5

1. FRONT & REAR DIFFERENTIAL

BEVEL GEARS

#364935 GRAPHITE OPTION
#364945 ALU OPTION
#364955 STEEL INCLUDED

941014

BAG

304932 GRAPHITE GEAR DIFF BEVEL & SATELLITE GEARS (2+4)
304980 COMPOSITE GEAR DIFF CROSS PIN
304990 DIFF GASKET (4)
364902 GEAR DIFFERENTIAL FOR 2.5MM PIN - SET
364910 COMPOSITE GEAR DIFFERENTIAL CASE
364955 STEEL DIFFERENTIAL BEVEL GEAR 35T
364961 GEAR DIFF OUTDRIVE ADAPTER FOR 2.5MM PIN - HUDY SPRING STEEL™ (2)

981210

364961

364990

903258

304990

964050

364955

964031

304932

304980

972050

981210

972050

941014

364961

364910

964050

304932

964031

BEVEL & SATELITTE GEARS + PINS

#304932 + #304980 GRAPHITE INCLUDED
#335030 + #335080 STEEL OPTION

364990 COMPOSITE BEVEL GEAR BUSHING (2)
903258 HEX SCREW SFH M2.5x8 (10)
941014 BALL-BEARING 10x15x4 RUBBER SEALED - GREASE (2)
964031 WASHER S 3.5x10x0.2 (10)
964050 WASHER S 5x15x0.3 (10)
972050 SILICONE O-RING 5x2 (10)
981210 PIN 2x10 (10)

964050

S 5x15x0.3

972050

O 5x2

981210

P 2x10

964050

S 5x15x0.3

2x

2x

NOTE ORIENTATION

➊

#106210 HUDY GRAPHITE GREASE

➍

OIL

➌

➋

DO NOT USE for optional ALU or GRAPHITE gears

#106210 HUDY GRAPHITE GREASE

➍

STEP DETAIL
Use tweezers to

insert pin

➍

➋

➌

➍➎

➎

STEP DETAIL

➎

➊

➍

DETAIL

CUTAWAY VIEW

972050

O 5x2

981210

P 2x10

➎

OIL

DETAIL

6

1. FRONT & REAR DIFFERENTIAL

964031

S 3.5x10x0.2

2x

TO ENSURE YOU HAVE THE SAME AMOUNT OF OIL FROM REBUILD TO REBUILD, DO THE FOLLOWING:

➊ Put the diff (without oil) on the scale and

check the weight (approximately 9.80g)

Front diff

Silicone oil 30.000cSt

Fill just above the

cross-pins.

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.

#107865

HUDY Ultimate Digital Pocket

Scale 300g±0.01g

1 140

g

30.000cSt

11.40g + 1.20g = 12.60gDiff.

Diff.

11.40g + 1.20g = 12.60g

Rear diff

OIL

Silicone oil 10.000cSt
Fill just above the
cross-pins.

Fill differential up to the top of the

diff cross-pins. DO NOT fill the diff

to the top of the housing.

➋ Slowly pour oil into the diff and watch the weight.

Diff.

Diff.

1260
1260

g

g

DIFFERENTIAL OIL

903258

SFH M2.5x8

941014

BB 10x15x4

10.000cSt

TIPS FOR DIFFERENTIALS

REAR DIFERENTIALFRONT DIFERENTIAL

LOW TRACTION 20 000cSt (HUDY #106520)
MEDIUM-HIGH TRACTION 30 000cSt (HUDY #106530)
SUPER-HIGH TRACTION 40 000cSt (HUDY #106540)

NOTE:

Softer oil increases steering, harder oil increases stability.

2x 2x 2x

Tighten the screws equally but do NOT

tighten them completely.

LOW TRACTION 5 000cSt (HUDY #106450)
MEDIUM-HIGH TRACTION 10 000cSt (HUDY #106510)
SUPER-HIGH TRACTION 15 000cSt (HUDY #106515)

NOTE:

Softer oil increases rear traction, harder oil increases on-power steering.

Use HUDY Ball-Bearing Grease

#106220 - STANDARD
#106221 - BLUE
#106222 - RED

➊

➍

Finish tightening in
this order.

➌

➋

7

1. GEAR CENTER DIFFERENTIAL

902306

BAG

304930

364911

981210

364981

364970

903258

304930 COMPOSITE GEAR DIFF BEVEL & SATELLITE GEARS (2+4)
304980 COMPOSITE GEAR DIFF CROSS PIN
304990 DIFF GASKET (4)
364901 GEAR CENTER DIFFERENTIAL - SET
364910 COMPOSITE GEAR DIFFERENTIAL CASE
364911 COMPOSITE CENTER GEAR DIFFERENTIAL ADAPTER
364970 CENTER DIFF OUTDRIVE ADAPTER - HUDY SPRING STEEL™ (2)
364981 COMPOSITE CENTER DIFF SPUR GEAR 81T / 48

304930

304980

972050

364910

364970

972050

304990

964050

964031

902306 HEX SCREW SH M3x6 (10)
903258 HEX SCREW SFH M2.5x8 (10)
964031 WASHER S 3.5x10x0.2 (10)
964050 WASHER S 5x15x0.3 (10)
972050 SILICONE O-RING 5x2 (10)
981210 PIN 2x10 (10)

981210

CENTER DIFF SPUR GEARS

#364978 78T/48 OPTION

#364981 81T/48 INCLUDED

BEVEL & SATELITTE GEARS + PINS

#304930 + #304980 COMPOSITE INCLUDED

#335030 + #335080 STEEL OPTION

#304931 + #304980

GRAPHITE

OPTION

964050

S 5x15x0.3

972050

O 5x2

981210

P 2x10

964050

S 5x15x0.3

OIL

➊

NOTE ORIENTATION

➍

STEP DETAIL
Use tweezers to

insert pin

OIL

STEP DETAIL

➍

➋

➍

➋

➌

➍➎

➍

➌

DETAIL

➎

➊

CUTAWAY VIEW

OIL

972050

O 5x2

981210

P 2x10

➎

OIL

8

1. GEAR CENTER DIFFERENTIAL

964031

S 3.5x10x0.2

2x

Center diff

OIL

Silicone oil 100.000cSt
Fill just above the cross-pins.

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. DO NOT fill the diff

to the top of the housing.

TO ENSURE YOU HAVE THE SAME AMOUNT OF OIL FROM REBUILD TO REBUILD, DO THE FOLLOWING:

#107865

HUDY Ultimate Digital Pocket

Scale 300g±0.01g

1 1.00

g

100.000cSt

1250

g

DIFFERENTIAL OIL

902306

SH M3x6

903258

SFH M2.5x8

➊ Put the diff (without oil) on the scale and

check the weight (approximately 9.80g)

2.5x8mm

Tighten the screws equally but do NOT
tighten them completely.

11.00g + 1.50g = 12.50gDiff.

FOR CENTER DIFFERENTIAL

LOW TRACTION 50.000cSt (HUDY #106550)
MEDIUM TRACTION 100.000cSt (HUDY #106610)
HIGH TRACTION 500.000cSt (HUDY #106650)

NOTE:

Softer oil increases steering, harder oil increases stability.

Finish tightening in this order.

➋ Slowly pour oil into the diff and watch the weight.

3x6mm

➊

➌

➍

➋

9

2. REAR CENTRAL TRANSMISSION

902310

XRAY BALL-BEARINGS

#359050 5x10x4 GREASE OPTION
#940510 5x10x4 OIL INCLUDED
#940814 8x14x4 GREASE OPTION
#940815 8x14x4 OIL INCLUDED

DRIVE SHAFT COLLARS

#365470 COMPOSITE INCLUDED
#365471-K ALU - BLACK OPTION
#365471-O ALU - ORANGE OPTION

BEVEL DRIVE GEARS

#365114 GRAPHITE OPTION
#365134 STEEL OPTION

+

CENTRAL SHAFT UNIVERSAL JOINTS

#365440 OPTION

363083

365230

365427

981208

940510

980210

365442

365470

940815

362003

902306

MARKED “R“

365124

362003

364902+364955

902310

DETAIL

IMPORTANT

REAR BLOCK

BAG

980210

P 2x10

362003 DIFF BULKHEAD BLOCK SET REAR
363083 XT4 GRAPHITE SHOCK TOWER REAR 3.5MM
365124 STEEL BEVEL DRIVE GEAR 14T
365230 DRIVE SHAFT COUPLING - HUDY SPRING STEEL™
365427 CENTRAL DRIVE SHAFT 105MM - HUDY SPRING STEEL™
365442 CENTRAL SHAFT UNIVERSAL JOINT
365470 COMPOSITE DRIVE SHAFT SAFETY COLLAR - V2 (3)

902306 HEX SCREW SH M3x6 (10)

CENTRAL DRIVE SHAFT (105mm)

DRIVE SHAFT COLLARS

#365470 COMPOSITE INCLUDED
#365471-K ALU - BLACK OPTION
#365471-O ALU - ORANGE OPTION

902310 HEX SCREW SH M3x10 (10)
940510 BALL-BEARING 5x10x4 RUBBER SEALED - OIL (2)
940815 BALL-BEARING 8x14x4 RUBBER SEALED - OIL (2)
980210 PIN 2x10 (10)
981208 PIN 2x8 (10)

364902 GEAR DIFFERENTIAL FOR 2.5MM PIN - SET
364955 STEEL DIFFERENTIAL BEVEL GEAR 35T

DRIVE SHAFT COVER CAPS

Lubricate the drive shaft connecting joint properly so the drive shaft turns
freely. In the event that not enough grease is used, the connecting pin may lock
and may even, in extreme situations, push through the drive shaft cover cap.

➋

➌

➊

➍

#106210 HUDY GRAPHITE GREASE
#106213 HUDY JOINT GREASE - OPTION

10

2. REAR CENTRAL TRANSMISSION

902306

SH M3x6

940510

BB 5x10x4

940815

BB 8x14x4

981208

P 2x8

902310

SH M3x10

Marked “R”

REAR BLOCK

XRAY BALL-BEARINGS

#359050 5x10x4 GREASE OPTION
#940510 5x10x4 OIL INCLUDED
#940814 8x14x4 GREASE OPTION
#940815 8x14x4 OIL INCLUDED

DETAIL

Bearing with BLUE

DETAIL

rubber covers

➌

OIL

5x10x4mm

Bearing Oil
(HUDY #106230)

NOTE ORIENTATION

Bearing Oil

➍

➊

(HUDY #106230)

OIL

8x14x4mm

GRAPHITE GREASE
(HUDY #106210)

➋

➎

➏

THREAD LOCK

NOTE ORIENTATION

902310

SH M3x10

REAR DIFF 10.000cSt

ALTERNATIVE 2

SHOCKS MOUNTED BEHIND REAR SHOCK TOWER
DO NOT USE FOR BASIC SET-UP

Follow the TECH TIP on page 5

to prepare graphite parts

ALTERNATIVE 1

SHOCKS MOUNTED IN FRONT OF REAR SHOCK TOWER

(INITIAL SETTING)

NOTE
Alternatives shock mounted folow page 39 / step 2 and 3.

11

2. FRONT CENTRAL TRANSMISSION

365426

365230

981208

365470

XRAY BALL-BEARINGS

#359050 5x10x4 GREASE OPTION
#940510 5x10x4 OIL INCLUDED
#940814 8x14x4 GREASE OPTION
#940815 8x14x4 OIL INCLUDED

DRIVE SHAFT COLLARS

#365470 COMPOSITE INCLUDED
#365471-K ALU - BLACK OPTION
#365471-O ALU - ORANGE OPTION

BEVEL DRIVE GEARS

#365114 GRAPHITE OPTION
#365134 STEEL OPTION

+

CENTRAL SHAFT UNIVERSAL JOINTS

#365440 OPTION

980210

365442

940510

940815

362002

902306

365124

MARKED “F“

364902+ 364955

362002

362084

902310

902310

DETAIL

IMPORTANT

FRONT BLOCK

BAG

980210

P 2x10

362002 DIFF BULKHEAD BLOCK SET FRONT
362084 XT4 GRAPHITE SHOCK TOWER FRONT 3.5MM
365124 STEEL BEVEL DRIVE GEAR 14T
365230 DRIVE SHAFT COUPLING - HUDY SPRING STEEL™
365426 CENTRAL DRIVE SHAFT 72MM - HUDY SPRING STEEL™
365442 CENTRAL SHAFT UNIVERSAL JOINT
365470 COMPOSITE DRIVE SHAFT SAFETY COLLAR - V2 (3)

902306 HEX SCREW SH M3x6 (10)

DRIVE SHAFT COVER CAPS

Lubricate the drive shaft connecting joint properly so the drive shaft turns
freely. In the event that not enough grease is used, the connecting pin may lock
and may even, in extreme situations, push through the drive shaft cover cap.

CENTRAL DRIVE SHAFT (72mm)

902310 HEX SCREW SH M3x10 (10)
940510 BALL-BEARING 5x10x4 RUBBER SEALED - OIL (2)
940815 BALL-BEARING 8x14x4 RUBBER SEALED - OIL (2)
980210 PIN 2x10 (10)
981208 PIN 2x8 (10)

364902 GEAR DIFFERENTIAL FOR 2.5MM PIN - SET
364955 STEEL DIFFERENTIAL BEVEL GEAR 35T

➋

➌

12

➊

➍

#106210 HUDY GRAPHITE GREASE
#106213 HUDY JOINT GREASE - OPTION

DRIVE SHAFT COLLARS

#365470 COMPOSITE INCLUDED
#365471-K ALU - BLACK OPTION
#365471-O ALU - ORANGE OPTION

902306

SH M3x6

940510

BB 5x10x4

2. FRONT CENTRAL TRANSMISSION

Bearing with BLUE
rubber covers

➍

OIL

5x10x4mm

➊

Bearing Oil
(HUDY #106230)

NOTE ORIENTATION

Bearing Oil

(HUDY #106230)

OIL

8x14x4mm

DETAIL

940815

BB 8x14x4

981208

P 2x8

902310

SH M3x10

Marked “F”

DETAIL

XRAY BALL-BEARINGS

#359050 5x10x4 GREASE OPTION
#940510 5x10x4 OIL INCLUDED
#940814 8x14x4 GREASE OPTION
#940815 8x14x4 OIL INCLUDED

➋

GRAPHITE GREASE

(HUDY #106210)

NOTE ORIENTATION

THREAD LOCK

➌

➎

902310

SH M3x10

FRONT DIFF 30.000cSt

NOTE ORIENTATION

Follow the TECH TIP on page 5

to prepare graphite parts

13

3. REAR SUSPENSION

903312

363321

362315

902308

362478

367210

363311

362315

306219

901304

362003

901303

303431-K

303454

901308

303454

323112-M

REAR SUSPENSION ARMS

#323112-M MEDIUM INCLUDED
#323112-H HARD OPTION
#323112-G GRAPHITE OPTION

#363313
BRASS REAR LOWER SUSPENSION
HOLDER SET +2 - RR+RF

903312

ANTI-ROLL BARS

#362470 1.0mm
#362471 1.1mm
#362472 1.2mm
#362473 1.3mm
#362474 1.4mm
#362476 1.6mm
#362478 1.8mm
#362480 2.0mm

OPTION
OPTION
OPTION
OPTION
OPTION
OPTION
INCLUDED
OPTION

14

BAG

303431-K ALU 4.9MM BALL END - BLACK (2)
303454 BALL JOINT 4.9MM - OPEN (4)
306219 COMPOSITE SET OF SERVO SHIMS (4)
362003 DIFF BULKHEAD BLOCK SET REAR
362315 ECCENTRIC BUSHING SET (2)
362478 ANTI-ROLL BAR 1.8 MM
323112-M XT4 COMPOSITE SUSPENSION ARM REAR LOWER - MEDIUM
363311 ALU REAR LOWER SUSP. HOLDER +2 - FRONT - 7075 T6 (5MM)
363321 ALU REAR LOWER SUSP. HOLDER +2 - REAR - 7075 T6 (5MM)

367210 SUSPENSION PIVOT PIN (2)
901303 HEX SCREW SB M3x3 (10)
901304 HEX SCREW SB M3x4 (10)
901308 HEX SCREW SB M3x8 (10)
902308 HEX SCREW SH M3x8 (10)
903312 HEX SCREW SFH M3x12 (10))

3. REAR SUSPENSION

306219

SHIM 3x6x2

903312

SFH M3x12

Marked “R”

➍

➊

INITIAL POSITION

1º 1º0.5º 0.5º0º

Composite eccentric bushings

DETAIL

REAR SUSPENSION ARMS

DETAIL

#323112-M MEDIUM INCLUDED
#323112-H HARD OPTION
#323112-G GRAPHITE OPTION

Check for free movement

➌

RR

➋

3x6x2mm

➌

RF

➊

INITIAL POSITION

➍

1º 1º0.5º 0.5º0º

Composite eccentric bushings

All possible mounting

If the suspension arm does not move freely use a

alternatives of eccentric bushings

HUDY Arm Reamer to size the holes of the arms

Arm Reamer 3.0mm

(HUDY #107633)

ECCENTRIC BUSHINGS HAVE TWO DIFFERENT OFFSETS FROM THE CENTER.

TOE-IN

ANTI-SQUAT

ROLL CENTER

Middle position = 0.5° or 0.375mm from center.

TRACK-WIDTH

Outer position = 1° or 0.75mm from center.

The XRAY rear alu lower suspension holders provide great range of adjustment for the rear suspension. Using different combinations of eccentric bushings, fine adjustment of rear anti-squat, rear toe-in, rear
roll center, and rear track-width can be obtained. For more information about the influence of rear anti-squat, rear toe-in, rear roll center and rear track width on car handling, please refer to HUDY Set-up Book
(#209100).

ANTI-SQUAT ROLL CENTER TRACK-WIDTH TOE-IN

RR RR RR RRRF RF

=2°

=3°

=1°

=3°

=2°

=4°

=1°

=2°

=0°

=+0.75mm

=

0mm

=-0.75mm

The tables describe the amounts of adjustment using the center and outside positions of the
eccentric bushings. The middle position eccentric bushings allow for finer adjustment increments.
Example:

0(RR) - 0 (RF) = 2°

0(RR) - 0.5 (RF) = 2.5°

0(RR) - 1 (RF) = 3°

RF

=+1.5mm

=

0mm

=-1.5mm

RF(°) (mm) (mm) (°)

=3°

=4°

=2°

=2°

=3°

=1°

= 2°

= 2.5°

= 3°

=4°

=5°

=3°

15