Servicing and repair 51/70
RE 79022-01-B/04.2020, General Operating Instructions HYDROTRAC GFT 8000 series 40, Bosch Rexroth AG
10.4.2 Changing the lubricating oil via the cover side
Risk of damaging the planetary gearbox!
If you mix different oil types or the same oil types from different oil
manufacturers, this may change the oil properties!
For re-filling, always use the same oil type from one oil manufacturer.
Never mix synthetic lubricating oils with mineral oils or with other synthetic
lubricating oils.
Fill the planetary gearbox with the oil quantity indicated in the technical data.
Make sure to determine the exact oil quantity on the planetary gearbox.
Carry out an oil change before the planetary gearbox has completely cooled
down. This ensures that solid particles have not yet settled.
Strictly observe the lubricating oil manufacturer's product data sheets and
safety data sheets when handling lubricating oil. These data sheets are not
included within Rexroth's scope of supply.
Change the lubricating oil at the intervals specified in the maintenance schedule. If
existing, observe the maintenance schedule in the material number-specific
operating instructions.
Changing the lubricating oil via the cover side:
Observe the information on the planetary gearbox dimensioned drawing in
appendix D “Technical data / Drawings” of the material number-specific operating
instructions.
• Bore 9: for filling the lubricating oil
• Bore 8: for checking or draining the lubricating oil
1 Put the planetary gearbox out of service. Proceed as described in the
instructions of the machine or the overall vehicle.
2 Check the oil level as described in chapter 10.2.2 “Checking the oil level of the
planetary gearbox via the cover side”.
3 Turn the planetary gearbox as shown in the figure on the left: bore 9 in 9
o’clock position and bore 8 in 6 o’clock position.
4 Place a catch basin with sufficient capacity under the planetary gearbox.
5 Loosen the screw plug of the bore 9 slowly, so that any existing pressure can
be released.
6 Remove afterwards the screw plugs from the bores 8 and 9.
7 Drain the lubricating oil completely in the catch tank.
8 Check visually whether e.g. water, metal particles or mud are in the drained
lubricating oil.
Procedure
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