|
Replace differential gear ring gear (F23)
 Remove
|
| 2. |
Dismantle transmission
Note: When replacing
the ring gear, the adjustment of the thrust collar must be
determined and adjusted if necessary. The tapered roller bearings
of the differential must be removed for this purpose 
|
|
| 3. |
Measurement (I) Distance between the height of the ring gear
and the seat of the tapered roller bearing, measure shim on
transmission housing side
Note: With a standard
commercial digital depth gauge with a measuring range of at least
250 mm and graduations of 0.01 mm, determine the measurement (I),
distance between the height of the ring gear and the seat of the
tapered roller bearing for the differential on the housing
side.
| • |
Undertake measurement at three measuring points (arrows) evenly
distributed around the ring gear and differential
|
| • |
Add up measured values and divide by the number of
measurements
Note: This method of
calculation is illustrated in the table below.
|
|
|
|
| 4. |
Measured values
Note: The purpose of
the following tables is to explain the pressure comb adjustment
using an example calculation.
The measured values in the left hand table serve as an example of
the calculation used for evaluating the measurement.
You can enter your measured results in the right hand table (as a
print-out) to make the evaluation easier.
|
Example:
|
|
|
|
Measurement:
|
|
Your values
|
|
1st measurement
|
|
15.02 mm
|
|
1st measurement
|
|
|
|
2nd measurement
|
+
|
15.06 mm
|
|
2nd measurement
|
+
|
|
|
3rd measurement
|
+
|
15.05 mm
|
|
3rd measurement
|
+
|
|
|
Total value
|
=
|
45.13 mm
|
|
Total value
|
=
|
|
|
Mean value
|
:3 =
|
15.04 mm
|
|
Mean value
|
:3 =
|
|
Note: After installation
of the new ring gear, the replacement of which is described in this
operation, the measurement must be performed in the same way for
the new ring gear.
If a value deviates by more than 0.08 mm from the other values, the
measurement must be repeated as a measurement error has
occurred.
|
| 5. |
Determine mean value of the old ring gear
|
Table for example of calculation of difference
measurement:
|
|
Mean value for new ring gear
|
|
15.16 mm
|
|
Mean value for old ring gear
|
-
|
15.04 mm
|
|
± Difference
|
=
|
+ 0.12 mm
|
|
Table for your difference measurement
calculation:
|
|
Mean value for new ring gear
|
|
|
|
Mean value for old ring gear
|
-
|
|
|
± Difference
|
=
|
|
| • |
Deduct mean value for old ring gear from mean value for new
ring gear
Note: If the difference
between the old and the new ring gear amounts to more than
(+0.02/-0.06) mm, then the thrust collar must be adjusted.
|
|
|
| 6. |
Determine difference measurement
Note: The total
thickness of the two shims remains constant.
Appropriate shims can be ordered via the "Service" Department.
The actual measurement for the shims (2) is determined using a
micrometer (3) since the shims are not labelled.
|
Difference measurement
|
Shim (transmission housing side)
|
Shim (clutch housing side)
|
|
- 0.25 mm
|
Old
|
0.90 mm
|
New
|
0.65 mm
|
Old
|
0.75 mm
|
New
|
1.00 mm
|
|
+ 0.20 mm
|
Old
|
0.90 mm
|
New
|
1.10 mm
|
Old
|
0.75 mm
|
New
|
0.55 mm
|
|
+ 0.13 mm
|
Old
|
0.90 mm
|
New
|
1.05 mm
|
Old
|
0.75 mm
|
New
|
0.60 mm
|
|
+ 0.12 mm
|
Old
|
0.90 mm
|
New
|
1.00 mm
|
Old
|
0.75 mm
|
New
|
0.65 mm
|
Note: During adjustment,
the shims must be selected so that the smallest possible tolerance
is achieved.
Used shims can be re-used for subsequent adjustment operations,
provided that they have not been damaged.
| • |
If the difference measurement is positive (+), the shim (on the
transmission housing side) (4) must be selected so that it is the
same measurement thicker
|
| • |
If the difference measurement is negative (-) the shim (on the
transmission housing side) (4) must be selected so that it is the
same measurement thinner
|
| • |
if the shim (on the transmission housing side) (4) is thicker,
the shim (on the clutch housing side) (1) must be selected so that
it is the same measurement thinner
|
| • |
if the shim (on the transmission housing side) (4) is thinner,
the shim (on the clutch housing side) (1) must be selected so that
it is the same measurement thicker
|
|
|
| 7. |
Install differential gear tapered roller bearing
|
| 8. |
Check differential for damage
Note: Replace damaged
differential.
|
|
Important: Use protective
jaws.
|
| 9. |
Clamp differential (1) in vice
|
| 10. |
Remove ring gear
| • |
Unscrew 10x bolt (arrow)
|
| • |
Drive ring gear (2) off differential gear with plastic
hammer
|
|
|
|
| 11. |
Clean all threads (arrow) and contact surfaces of the ring gear
(1)
|
|
Install
|
| 12. |
Attach ring gear (1) to differential (2)
| • |
Place ring gear in position
|
| • |
Fit ring gear carefully with plastic hammer
|
| • |
Tighten 2x bolt
Note: Both bolts will
be replaced later.
|
|
|
|
Important: Use protective
jaws.
|
| 14. |
Clamp differential gear (1) in a vice
|
| 15. |
Tighten 10x new bolt (arrow) 90
Nm
Note: Wet bolts with
bolt locking compound.
|
|
| 16. |
Assemble transmission
|
|
