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Check and correct transmission fluid level
(AF40)
Important: The
following procedure contains 2 work processes:
1. Filling: Prefill transmission fluid with engine off, after
repair work on transmission, removal and installation / exchange of
gearbox or axle shafts. After prefilling with the engine off, the
transmission fluid level must be checked with the engine
running.
2. Checking: Check transmission fluid level and correct with engine
running.
Note: The oil level
must only be checked and corrected if necessary, together with the
fluid temperature, see TECH 2, after repairs on the transmission,
oil loss, gear change problems or power transmission problems after
changing gear. Ensure that only the appropriate transmission fluid
for AG40 is used when topping up. 
Inspect
| 1. |
Test conditions:
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The vehicle must be parked on a level surface.
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| • |
Selector lever in position "P
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| 2. |
Unscrew fluid filling bolt (1)
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Important: If the transmission
fluid level is merely checked, proceed with Step 8.
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| 3. |
Prefill transmission fluid when exchanging gearbox and after
repair work - engine off
| • |
Place collecting pan underneath.
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Important: The rising tube (3)
must not be unscrewed to check the fluid level. With the fluid
checking bolt unscrewed, oil runs out of the rising tube to the oil
level (6) at the upper edge of the rising tube
The rising tube may be turned out only for emptying the
transmission (1). In this case, the seal (2) on the rising tube
must be replaced.
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| 4. |
Unscrew fluid checking bolt (5) from rising tube
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| 5. |
Top up with transmission fluid until it runs out of the rising
tube
Note: Allow
transmission fluid to run out until it just drips out
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| 6. |
Tighten fluid checking bolt 8 Nm
Note: Replace O-ring
(4)
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| 7. |
Top up transmission fluid via fluid filler port
| • |
Top up with 0.5 litres transmission fluid and continue from
step 8
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| 8. |
Check transmission fluid level and correct with engine
running.
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Important: The transmission fluid
level must be checked correctly with the engine running at 70°
to 80°C transmission fluid temperature.
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| 9. |
Start the engine and allow it to run until the end of the
test
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| 10. |
Shift through the gear selector positions while depressing the
foot brake
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Shift selector lever from position "P" to "D" and back to "P",
maintaining each position at least 2 seconds
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Repeat this procedure 2 times
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| • |
Check transmission fluid temperature with TECH 2 (see data list
parameters)
| – |
Unscrew fluid checking bolt
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| – |
Allow the transmission fluid to run out until it drips out of
the rising tube. If it does not, top up with transmission fluid and
then allow it to run out until it is just dripping out of the
rising tube.
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| – |
Tighten fluid checking bolt with new O-ring 8 Nm
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| – |
Top up with 0.5 litres of transmission fluid
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| 11. |
Tighten fluid filling bolt with new seal ring 40 Nm
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