Service Training
Page 4.2
Section 38
09.04
4.2.4.2 SERVICING THE REDUCTION GEARBOX (GR 80 -02/-03/-04)
CONDITIONS
- Jack up the truck and block it up securely.
- Remove the traction wheel.
- Place an oil pan under the gearbox.
REPLACING THE SEALING RING (3)
- Tighten the cover (2) using a bar (support on 2 wheel mounting bolts).
- Remove retaining ring (1).
- Remove the bar, take the cover (2) off the ring gear (4) and remove the O-ring (3).
- Installation is the reverse of removal.
- Fill gear oil to the correct level.
REPLACING THE SEALING RING (23)
- Remove the cheese head screws (8).
- Dismantle the ring gear (4) along with parts (1), (2), and (3) from the wheel hub (28) and remove the O-
ring (23).
- Installation is the reverse of removal.
- Fill gear oil to the correct level.
REPLACING THE SHAFT SEALING RING (30)
- Remove the cheese head screws (8).
- Dismantle the ring gear (4) along with parts (1), (2), (3) and (23) from the wheel hub (28).
- Extract the sun gear shaft (9) along with the planet carrier items 10 to 17.
- Remove the retaining rings (24) from the planet carrier (21) journal.
- Press the planetary gears (25) off the journal with a mounting iron or a puller.
- Heat the grooved nut (19) and remove with a suitable spanner and torque converter.
NOTE: The nut (19) is torqued to 2100 Nm and secured with Loctite.
- Pull the planet carrier along with the centring ring (20) and wheel hub (28) from axle flange (32).
- Extract the sealing ring (30) from the hub (28).
- Clean all parts and check for damage.
- Press the sealing ring (30) into the wheel hub with a suitable plate.
- Coat the toothing of the axle flange (32) with grease.
- Slide the wheel hub (28) and planet carrier (21) onto the axle flange (32) so that the axles of the planetary
gears are horizontal.
- Coat the thread of nut (19) with Loctite 270 and torque the nut to 2100 Nm.
- Turn the wheel hub about 10 times and hit the outer circumference of the hub several times with a plastic
hammer for better seating.
- Retighten the nut with a torque of 2100 Nm.
- Assembly of the planetary hub reduction gear is the reverse of removal. Renew seals (23) and (3).
- Fill gear oil to the correct level.
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