Scania Central gear RP832-RBP832. Manual - part 12

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45

Setting tooth clearance and differential 
housing bearing preload

1

Set up dial gauge 98 075 perpendicular to 
one of the teeth on the crownwheel. Zero the 
dial.

2

Adjust the tooth clearance by moving the 
whole differential housing sideways using 
the adjusting rings. Turn both the rings 
equal amounts and make sure the ring 
notches correspond with the holes for the 
split pins.

3

The tooth clearance must be 0.30-0.41 mm 
on all gear ratios except 5.88, where the 
clearance must be 0.25-0.36 mm. It is better 
to be closer to the minimum limit as the 
clearance can increase slightly when the 
bearing caps are tightened. Take 
measurements at 4 points and calculate the 
average.

4

Tighten the bearing cap bolts to 330 Nm. 
Rotate the crownwheel ten or so times and 
check the tooth clearance.

Note: Make sure all the bearing rollers are 
rotating and not sliding. Alternatively, use a 
screwdriver to feel whether any of them are 
loose. When the central gear is positioned with 
the crownwheel upwards, check the bearing 
preload at the top bearing.

5

Fit the split pins.

Differential housing and crownwheel

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Checking mesh image

1

Apply a thin layer of colour marker on two 
adjacent teeth. Turn the crownwheel one 
half turn and repeat the procedure.

2

Make sure the colour marker makes contact 
with the pinion. Rotate the end yoke a few 
turns in either direction. Meanwhile, brake 
the crownwheel with your hand.

3

Make sure the mesh image corresponds with 
figure 1 on both the leading and trailing 
flanks of the teeth.

4

If the image is similar to figure 2 then the 
pinion is too far from the centre of the 
crownwheel.

If the image is similar to figure 3 then the 
pinion is too close to the centre of the 
crownwheel.

Adjust the pinion and crownwheel in the 
direction of the arrows and maintain the 
prescribed tooth clearance.

Leading flank

Trailing flank

Fig. 1 Correct mesh image

Differential housing and crownwheel

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Leading flank

Trailing flank

Fig. 2 Incorrect mesh image. The pinion must be adjusted closer to the centre of the crownwheel

Leading flank

Trailing flank

Fig. 3 Incorrect mesh image. The pinion must be adjusted further away from the centre of the 

crownwheel

Differential housing and crownwheel

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Fitting the differential lock

1

Apply locking compound 561 200 to the 
bearing bracket bolts 36 and fit the bearing 
bracket 35 with lever 34 into the gear 
housing 36.

2

Fit together coupling half 43 and thrust ring 
44 with a bearing washer 45 on either side 
of the thrust ring. Fit the retaining ring 46.

43 Coupling half

44 Thrust ring

45 Bearing washer

46 Retaining ring

3

Refer to "Differential lock operation for 
axle differential" under "Spot repairs" for 
setting.

Differential housing and crownwheel