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Bag 1, Bag 2, Parts used – OFNA Racing OB4 RTR User Manual

Page 4: Long short or or rear front, Shock assembly, Assembly of the 4mm ball end, Front differential assembly

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2mm E-Ring x8

3 x 30mm
Shock Shaft x4

Pressure Top x4

O-Ring (blue) x8

#37070 or 37967

#37751

37080

FILLING THE SHOCK OIL

*Use pliers to snap on
E-Ring.

* Be careful not to damage the shock shaft.

(1mm x1 Hole)

(1.2mm x2 Holes)

* Cut the piston
the plastic parts tree.

from

* Pull down piston and pour
oil into shock cylinder.
Remove air bubbles by
slowly moving piston up
and down.

1mm

37070
37967
3mm O-Ring
(2 pcs)

37751
2mm E-Ring

39020
Shock Shaft

37967
Washer
(Black)

37967
C-Ring

* The c-ring must fit into
the groove

.

37100
Piston
(1mm x 2 Holes)

37965
Shock Body, Fnt/Rr

Long Short
or or
Rear Front

Oil

Oil

* The O-Ring must be inserted
into groove.

37966
P12 O-Ring

*Use a little shock oil
to lubricate O-Rings
before screwing on
adjusting nut.

37962
Adjust Nut
(Blue)

37963
Adjust Nut
(Purple)

Oil

37650
4mm
Ball End

Make pair for rear.

1

1

2

3

SHOCK ASSEMBLY

(Long)

37650
4mm
Ball End

Make pair for front.

(Short)

Shock Oil, Silicone

37080
Pressure Top

37100
Ball End
( Large )

37960
Shock Cap
(Blue)

37961
Shock Cap
(Purple)

37100
Spring Holder

* Take the spring holder
the plastic parts tree.

from

Shock
Spring

Shock
Spring

37100
Spring Holder

Stock Spring; #39010 pair

Optional Spring - 2 pair set
39315, white set
39316, blue set
39317, yellow set

39314, Spring Racer Pack
2 pair white, 2 pair blue, 2 pair yellow

Threaded Shock set
37958, blue
37959, purple

#39020

* Put a little oil
onto the 3mm o-ring
before assembly.

ASSEMBLY OF THE 4MM BALL END

O-ring

TIP
* Use the 1.2mm x 2 hole
piston for this kit.
* 50wt silicone shock
is suggested by racing
team.

BAG
1

Step 1

PARTS USED

( Front )

( Rear )

• Use same
shock body
for front and
rear units.

39431

Differential
Cap Joint, long x2

37773

37751

Steel Ring x2

M2x10 Screw x4

2mm E-Ring x2

37775

3mmx20mm
Pin x1

BAG
2

Step 4-5

PARTS USED

FRONT DIFFERENTIAL ASSEMBLY

37775

3mmx20mm
Pin

37772

37772

Bevel Gear
10T

Bevel Gear
10T

37772

Bevel Gear
10T x2

37771

Bevel Gear
13T x2

Notice the direction
of the plastic washer.

Notice indent gear pocket,
not for o-ring

*Snap E-Ring onto
Diff. Cap Joint.

37771
Bevel Gear
13T

37773

Steel Ring

39431
Differential
Cap Join, longt

2mm E-Ring

39433
plastic
Washer

39433
plastic
Washer

1.

4.

*Apply diff g

grease to the

differential, during assembly.

ear

M2x10 Screw

To test the effectiveness of the gear differential
hold the gear tightly with one hand and turn
one cap joint.
Does the other cap joint move in the opposite
direction and smoothly?
If gear differential does not

smoothly,

assemble the gear diff. once again

move

* CHECKING YOUR DIFFERENTIAL ASSEMBLY

*Put the gasket
into groove.

3.

SILIC

ONE

OIL

Bevel Gear
Assembly

39434
Gasket

39401
Front Diff.
Case

37776
35T Gear
Diff Pulley

2mm E-Ring

37771
Bevel Gear
13T

37773
Steel Ring

39431
Differential
Cap Joint,
Long

2.

Notice the direction
of the plastic washer.

39432
5x7x1mm
O-Ring

39432
5x7x1mm
O-Ring

39432
5x7x1mm
O-Ring

39432
5x7x1mm
O-Ring

50%

* PUT THE OIL INTO DIFF. CASE ABOUT 50%

USE THE SILICONE DIFF LOCK IN KIT, 30,000wtg.

4

5

~

G

R

E

A

S

E

TIP
Grease all seals
before installing
for a better fit.

FRONT GEAR DIFF IS
LONGER/WIDER THAN REAR

OPTION PARTS:

Hard
(White)

Middle
(Yellow)

Soft
(Blue)