42
RECOMMENDED PRODUCTS
SUSPENSION & DRIVETRAIN MAINTENANCE
• Check suspension for free movement during building and operation, and especially after running
and if you have crashed the car. If the suspension does not move freely, use the appropriate HUDY
Arm Reamer to clean and resize the holes of the suspension arms.
• Regularly check the drive shaft pins (both side and center) and if they show any wear must
be immediately replaced by new pins. If the car is run with worn pins, excessive wear on the
diff outdrives will result. The #106000 HUDY Drive Pin Replacement Tool (for 3mm Pins) is a
compact, rugged multi-use tool set for replacing 3mm drive pins in drive shafts. Use the HUDY
replacement drive shaft pins 3x12 (#106051).
• Regularly inspect and replace the connecting pins which connect the center drive shafts with the
pinion gear, and also the pins that connect the wheel drive shafts with wheel axles. Use HUDY
Graphite Grease to lubricate the drive shaft connecting joints and the diff gears.
HUDY SPRING STEEL™
The HUDY Spring Steel™ used in the car is the strongest and most durable steel material on the
RC market. While items made from HUDY Spring Steel™ are still subject to wear, the lifespan is
considerably longer than any other material. As parts made from HUDY Spring Steel™ wear, the
MAINTENANCE
• For club racing, it is recommended to check the shocks for air inside before each race and only re-fill
and bleed them if necessary. Before each race day, make sure you take the spring off of each shock,
hold it up to your ear, and quickly compress the shock rod fully into the body while listening for any
air making a “whistling” or “squishy” sound as it passes through the piston holes. If you hear any
air, refill and bleed your shocks. For high-competition racing, it is recommended that the shocks be
re-filled and bled before a large event.
➊ Remove the seals on both sides of the bearing (if present). If the seals bend a little and you can see
a kink, carefully flatten the kink out by hand.
➋ Spray the seals with motor cleaner and blow dry with compressed air.
➌ Spray the bearing on both sides with motor cleaner.
➍ Spin the bearing while it is still wet to dislodge any particles with the cleaner.
➎ Spray the bearing on both sides again.
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.
BEARING MAINTENANCE
Ball-bearings in an off-road car must be properly maintained for smooth operation and long lifespan.
The XB4 ball-bearings are degreased and are lubricated with HUDY Bearing Oil or HUDY Grease. The following procedures are recommended to clean all of the bearings in your off-road car. For high-
competition racing, we recommended doing this every 3-4 weeks, or before a major race.
• If building or pairing new shocks, always make sure they are the same length using a shock
length measuring tool and adjust the lower ball joints as needed.
• During regular shock operation, oil naturally gets on the shock shaft and drop-by-drop slightly
gets out of the shock body. Shocks should be inspected regularly after each race, and oil replaced
as required.
➏ Blow both sides of the bearing dry with compressed air to make sure particles come out.
➐ Hold the inner part of the bearing with my left thumb/forefinger and spin it to make sure it
spins free without any abnormal vibrations or sounds.
➑ Place one drop of bearing oil into each side of the bearing.
➒ Replace both seals at the same time by lining them up on each side of the bearing and
lightly pressing them in all the way around the bearings circumference with your thumb and
forefinger. Do not press too hard or use any type of tool, such as a wrench tip, to push the
blue seals in as they will push in too far, bend and cause drag.
• Pivot balls and ball-joints will naturally wear for some time and will generate play. If there
is too much play the pivot balls and ball joints need to be replaced.
• If the car is run in wet conditions, apply WD-40® on all drivetrain parts before the run. After
the run, clean and dry the parts again.
brown color will fade (get lighter) but it will not affect the strength of the material. The brown
color is only a surface treatment and if the brown color will wear the durability of the part
will be still strong.
#106210 HUDY GRAPHITE GREASE #106213 HUDY JOINT GREASE
or
• Use correct oil or grease to lubricate the bearings:
#106230 HUDY Bearing Oil
#106220 HUDY Bearing Grease - Standard
#106221 HUDY Bearing Grease - Blue
#106222 HUDY Bearing Grease - Red
HUDY #106230 HUDY #106220 HUDY #106221 HUDY #106222
If you spin test the bearing after you have re-oiled and sealed it, it will not spin freely for an
extended period of time. The lightest of oils may allow it to spin for 1-2 seconds. This is normal
and once you have mounted the bearings in the car again, the drive train will spin freely.
Make sure you use a motor cleaner that does not leave a residue after it dries as this may
cause drag and wear in the bearings.
GEARING
cSt
cSt
TRACK SIZE
TIGHT
OPEN
TRACK TRACTION
HIGH
LOW
TRACK SURFACE
SMOOTH MEDIUM
MEDIUM
MEDIUM
BUMPY
TRACK TYPE
HARD PACKED
BLUE GROOVE
CARPET
GRASS
CLAY
TRACK CONDITION
DRY DUSTY
WET
MUD
SHOCKS
ø1.7mm
ø1.6mm
SPRINGS
CUSTOM PISTONS
OIL
REBOUND
%%
PISTONS
ø1.3mm
ø1.4mm
ø1.2mm
mm
mm
ø
ø
HOLES
HOLES
HOLES
HOLES
6
3
2
HOLES
HOLES
HOLES
6
3
2
XB4’20 SET-UP SHEET VER. 1 ©XRAY 2019
SOFT DIRT
ASTRO TURF
HOLES
CASTER
ELECTRONICS LAYOUT
REARFRONT
MOTOR POSITION
REARFRONT
BATTERY POSITION
LOW SHORTSTD. SHORT
BATTERY SIZE
TIRES
BRAND
COMPOUND
INSERTS
WHEELS
RACE
TRACK
NAME
DATE
LAPS
BEST LAP TIME
FINAL POSITION
sec
PINION
SPUR GEAR
T
T
ANTI ROLL BAR
THICKNESS
mm
mm
ELECTRONICS
COMMENTS
MOTOR
MOTOR
TIMING
SPEEDO
BATTERY
APPLIED
APPLIED
QUALIFYING POSITION
FRONT REAR
SHOCK TOWER
POSITION
FRONT REAR
SHOCK POSITION
SIDE GUARDS
MEDIUM
HARD
REAR BRACE
MEDIUM
HARD
GRAPHITE FOR
REAR BRACE
YES
NO
BALL DIFF
GEAR DIFF
GEAR DIFF
SLIPPER BALL DIFF
GEAR DIFF
DIFFERENTIAL TYPE
MIDDLE
SATELLITE GEARS
FRONT REAR
STEEL
COMPOSITE
COMPOSITE
STEEL STEEL
COMPOSITE
40T 41T 40T 41T
OIL
cSt
mm
OIL
cSt
OIL
cSt
CASTER BLOCK
MEDIUM
HARD
GRAPHITE
ALU
ARM SHIM
mm
ARM SHIM
mm
SLIPPER
SLIPPER ADJUSTMENT
CROWN GEARCROWN GEAR
OUT
FRONT TOE
IN
REAR TOE
CASTER
6°
9°
12°
°
CHASSIS FLEX
SCREW USED
SCREW NOT USED
BALANCE
g
BALANCE
g
BALANCE
g
°
FRONT CAMBER
REAR CAMBER
RIDE HEIGHT
#107720 GAUGE
RIDE HEIGHT
mm
RIDE HEIGHT
mm
LENGTH
mm
LENGTH
mm
DOWNSTOP SHIM
mm
UPSTOP SHIM
mm
UPSTOP SHIM
mm
° °
°
SERVO SAVER
MATERIAL
TIGHT
MEDIUM
SOFT
STANDARD
GRAPHITE
STANDARD
STEERING BRACE
UPPER PLATE
DOWNSTOP SHIM
mm
LOWER SHOCK POSITION
1
2
1
STEERING BLOCK
MEDIUM
HARD
GRAPHITE
LONGER BUSHINGS
UP
DOWN
2
1
2
2
3
1
#107701 SUPPORT BLOCKS
ALU
BRASS
ALU
BRASS
YES
NO
1-DOT
1
°
3°
RR
RR
RF
FF
FR
0.5°
1°
0.5°
1°
0.5°
1°
0.5°
1°
ROLL
CENTER
ECCENTRIC
BUSHINGS
2 1
ALU STEERING PLATE
2
1
4
3
#362573
WING
1.0mm
THICKNESS
1.5mm
2.0mm
BUMP STEER SHIM
mm
BODY
STANDARD
LIGHT
TYPE
35g
BALANCE
g
REAR UPRIGHT
ROLL ENTER
0.5°
1°
RAISING
GEARBOX
YES NO
OFFSET
WHEELBASE
DOWNSTOP
mm
DOWNSTOP
mm
#107711 GAUGE
SHIM
mm
1
2
SHIM
mm
OFFSET
UPRIGHT WHEELBASE
SHIM
IN FRONT OF ARM
/mm
/slots
/slots
/slots
1
2 3 4
WING CUTTING LINE SIDE LINE
1 2 3 4 5
HIGHER
LOWER
MEDIUM
LONG SHORT
HARD
REAR ARMS
GRAPHITE
MEDIUM
LONG SHORT
HARD
FRONT ARMS
GRAPHITE
REARFRONT
DRIVE SHAFT
/mm
Lenght
DRIVE SHAFT
/mm
Lenght
CVD ECS
SHIM
/mm
HARD
GRAPHITE
ALU
#107711 GAUGE
SHOCK TOWER
ALU
GRAPHITE
ALU
GRAPHITE
CHASSIS
STANDARD
2.5mm
BUMP STEER
mm
SHIM
HARD
GRAPHITE
STEER. PLATE
ALU
SHIM UNDER STEER. PLATE
1
2
3
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