Arb RD81 Manuel d'utilisateur télécharger pdf (Page 14)

3 Approximate Backlash Shimming

3.2

Calculation and Selection of Pre-Load Shims

Ideally, the measurement you recorded as ‘C’ from the Air Locker

differential will closely match ‘A’ on the existing differential (within

0.1mm [0.004”] ) and then the factory shim can be reused, however,

quite often these measurements will vary slightly between one factory

differential and the next.

If this is the case you must create a new shim pack thickness by using

the measurements you recorded earlier to find a desired measurement

for ‘D’ in Figure 6.

Use the following calculation:

A + B – C = D (

Replacement Shim Pack

)

HINT : If your calculations are correct then the following

equation will also be true:

A + B – C – D =

ZERO

To achieve the desired shim thickness you can:

• Machine down the factory shim thickness.

• Add shims between the factory shim and the bearing cup.

• Purchase new factory shims at the desired thickness.

• Use a universal shim kit available from most drive train specialists.

• Add small amounts of shim between the bearing cone and the

bearing seat.

NOTE : NEVER machine the Air Locker.

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Arb RD81 Manuel d'utilisateur Page 14