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Bag 6, Apply thread lock, Assembly of the middle shaft – OFNA Racing OB4 RTR User Manual

Page 18: Assembly of the two speed gears

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5 x 11mm
Ball Bearing x2

37430

37751

2 x 8.8 Pin x2

37400

4 mm E-Ring x2

37660

15T Pulley

4mm E-Ring

5 x 11mm
Ball Bearing

37430

5 x 11mm
Ball Bearing

37430

39413
Mid Shaft
Block

39413
Mid Shaft
Block

2 x 8.8mm
Pin

4mm E-Ring

Pulley Mount

38050

4mm E-Ring

39409
Mid Shaft

Pulley Washer

3 x 10mm Flat Head
Tapping Screw x4

3 x 10mm
Flat Head
Tapping Screw

3 x 10mm
Flat Head
Tapping Screw

ASSEMBLY OF THE MIDDLE SHAFT

29

1

2

3

4

5

6

* Insert the Belt before assembly.

38140
Front Belt

*Take the pulley washer
from K-15 plastic tree.

OPTION PARTS: 39469
Alum. Mid Shaft Block

28

27

35933
2.6 X 4mm
Flat Head
Screw

2.6 X 4mm
Flat Head
Screw

ASSEMBLY OF THE TWO SPEED GEARS

(45T OLIVE GREEN/41T PINK RATIO IS FOR SHORT TRACK RACING)

(41T PINK/37T GREEN RATIO IS FOR TOP SPEED, CLOCKED AT 57 MPH)

35952
45T
Spur Gear
( Green)

35953
41T
Spur Gear
( Pink )

35936
1st Gear Carrier
(One-Way)

35937
2nd Gear Carrier
( Ball Bearing )

*Notice the direction of the
clutch cam.

3 x 3mm
Set Screw

37400
2 x 8.8
Pin

4mm
E-Ring

4 mm E-Ring x2

37390

37751

2 x 10.8mm
Pin x1

º

u

°

w

E ¦©

Àô

* Insert the 2x8.8mm pin
befor assembly.

37661
17T Pulley
Washer

38050
Pulley Mount

37661
17T Pulley

ASSEMBLY OF THE 2-SPEED TRANSMISSION
UNIT - P/N 39450

35938
Clutch Cam

BAG
6

Step 27~32

27

32

Figure not shown in
Dual Brake OFNA
configuration!

Apply
Thread Lock

Apply
Thread Lock

Apply
Thread Lock