Gravely 950001, Maintenance Manual

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Pivot Pin Maintenance
The pivot pins are fitted with a grease nipple leading to
a radial drilling that lubricates the bearing surfaces of
the pin and its mating hardened bushing. All pivot pins
should be greased weekly.
Pivot Pin Wear Tolerance
The pivot pins are not as hard as the bushings they
rotate within and therefore more likely to show signs of
wear after a long period of working operations. The
main diameter of the pin will measure 25 mm (0.984”)
when new. Permissible wear before replacement will
measure 24 mm (0.945”) diameter, beyond this the pin
must be replaced.
4.4 LUBRICATE TRACTION DRIVE CHAIN
1. Lower the lift arms and stop the engine.
2. Apply a general purpose oil (10w30) onto the
upper and lower chain that is exposed.
3. Start the unit and move it forward to expose the
sections of the chain that are not lubricated.
4. Stop the engine.
5. Apply oil to the newly exposed chain.
4.5 LUBRICATE REAR HUBS
Disassemble Hubs
1. Place the unit on jackstands. Remove the wheels
from the unit.
2. Remove the hub grease cap, take out the split pin
and remove the slotted nut from the end of the
axle.
3. Withdraw the hub from the stub axle and remove
the outer bearing cone assembly from the hub.
4. Carefully tap the inner bearing cone out of the hub,
together with the grease seal.
5. Using a suitable drift punch, drive the two bearing
cups out of the hub. The inner bearing cup is
removed from the outer end of the hub and the
outer bearing cup from the inner end of the hub.
Attachment Plate
Bushings
Pin Wear tolerance 25 - 24 mm