Radical Sportscars SR3 XX, Owner'S Manual, Page: 30 / 56

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7.6 SERVICING THE GEAR DRIVE UNIT
The Gear Drive Unit contains the final drive for a SR3, there are 4 ratio options to choose from dependent on
the nature of the circuit. These can be found in the appendix of this manual. Below is a step by step guide to
help with changing the ratios in the GDU:
1.
The first step with changing the ratios on the GDU is to place the drain
tray under the car for the GDU oil to drain into. Whilst changing ratios it is
important to check the conditions of the ones removed.
2.
Once the drain tray is in a suitable position, begin removing the M6
cap head bolts on the GDU side casing. As the side casing is being
removed, be careful as to not damage the rubber O ring. Whilst the case
is being loosened, the oil will begin to drain out of the GDU
3.
Once the casing has been removed, insert the locking device between
the two gears in order to stop rotation
4.
It is important to remember that each shaft has opposing threads; main
shaft has a left-hand thread and the input shaft has a right-hand thread.
Using the 42mm socket on the impact gun, remove the nut on the main
shaft.
5.
Using the 33mm socket, remove the nut on the input shaft
6.
As both of the nuts are removed, it is advised to remove each part
individually in order to make the rebuild process simpler
7.
It is strongly advised to check the gear teeth as the gears are being
removed; it is important to check for pitting on the gear teeth as this can sometimes occur over time
8.
Before fitting the new ratios clean the threads and inside the GDU- be sure to look out for any metal
fragments
9.
Once the GDU has been inspected and cleaned, it is time to fit the new ratios. Simply slide the gears,
bearings and spacers on the shafts
10.
Re fit the two locking nuts with Loctite on the threads before peening over the edges as a locking
method. These locking nuts should be torqued to 80 ft/lb
11.
When all of the components are refitted, it is recommended to apply sealant to the O ring for re-
fitment along with the edge of the side casing
12.
Re-fit the side casing before re inserting the M6 cap head bolts and torqueing to 12 ft/lb
13.
Once all the side casing bolts have been fitted, the GDU oil will need to be replenished as normal
(1.5 liters)
Tools R eq u ir ed :
o Drain Tray
o
Gun/Breaker Bar
o 33mm Socket
o 42mm Socket
o 5mm Hex Head
Socket
o
o
o Gear Locking Device
Ad d it ion al P ar t s R equ ir ed:
o Different Ratios
o GDU Oil
o
Hylomar Universal
Blue Gasket Sealant