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Maintenance
A708-01-880 Issue E
5.8.5 Drain the gearbox oil and clean the gearbox sight-glasses
Note: There are two oil level sight-glasses on the gearbox (Figure 1, 2 and 3, items 18). Clean both sight-glasses
when changing the gearbox oil.
1. Refer to Figure 1, 2 and 3. Remove the gearbox oil filler plug and bonded seal (4): see Warning above.
2. Refer to Figure 10. Place a suitable container under the gearbox oil drain plug (3); the container must have a
capacity of at least 7.5 litres.
3. Unscrew and remove the oil drain plug and bonded seal (3) and allow the oil to drain from the gearbox. Dispose
of the bonded seal.
4. Refer to detail C. Undo and remove the four M5 screws (15) from the bezel (14) on one of the gearbox oil level
sight-glasses.
5. Remove the bezel (14), O-ring (13), sight-glass (12), O-ring (11) and compression ring (10). Dispose of the O-rings
(11, 13).
6. Clean all of the sight-glass components and the sight-glass recess in the gearbox (9) with a soft lint-free cloth. If
necessary, use a suitable cleaning solution; if using a cleaning solution, ensure that all of the solution is removed
before reassembling the sight-glass.
7. Refit the compression ring (10) in the sight-glass recess in the gearbox (9).
8. Fit two new O-rings (11, 13) and the sight-glass (12), then fit the bezel (14) and secure with the four M5 screws
(15).
9. Repeat Steps 4 to 8 to clean the other gearbox oil level sight-glass.
5.8.6 Change the gearbox oil filter
1. Refer to Figure 10, detail B. Place a suitable container under the gearbox oil filter (8), to catch any spilled oil.
2. Unscrew and remove the gearbox oil filter (8) and gasket (7) from the filter port adaptor (5) on the gearbox.
3. Dispose of the oil filter and gasket (8, 7) and the oil in the container: refer to Section 6.2.
4. Use a soft lint-free cloth (and a suitable cleaning solution if necessary) to wipe clean the filter port adaptor (5)
and the gearbox around the adaptor.
5. Fit the new oil filter (8) and gasket (7) to the filter port adaptor (5) on the gearbox. Tighten by hand.
The gearbox may be pressurised. To remove the oil filler plug, undo it slowly until the vent hole
is visible, allow the gearbox to vent to atmosphere to reduce the pressure in the gearbox, then
fully undo and remove the oil filler plug. If not, hot (up to 115 °C, 239 °F) oil may be ejected under
pressure from the gearbox and cause injury.
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