LeeBoy 8510E - Page 122

5-32 LeeBoy Model 8510E Conveyor Paver
Maintenance
Gear Pumps
Hydraulic uid is transmitted throughout the machine to
motors and cylinders, becoming pressurized accord-
ing to the resistance present. The uid is controlled by
valves and distributed through hoses and tubes. Three
gear pumps play a signicant role in producing hydraulic
power as it supplies hydraulic uid to system compo-
nents: The tandem gear (augers), tandem drive, and
tandem auxiliary gear (charge and conveyors) pumps.
If equipped with the electric screed heat option, an
additional tandem gear pump supplies the generator.
(Figure 5-43)
Tandem
Gear Pump
(Augers)
Tandem Drive Pump
Tandem Auxilliary
Gear Pump
(Charge and Conveyors)
Electric Screed
Tandem Gear Pump
(Generator)
Figure 5-43. Gear Pumps
The tandem gear and tandem drive pumps are
accessed via the left access panel. The tandem gear
pump(s) attaches to the tandem drive pump. (Figure
5-44) The auxiliary tandem gear pump is easier to
access from the front access panel inside the hopper.
Tandem
Gear Pump
Figure 5-44. Tandem Gear Pump
Use the following procedure for replacing either of the
gear pumps:
1. Access the gear pump slated for replacement.
2. Label and disconnect the hoses to the gear pump,
capping the tting on the pump.
3. Label, plug and cap the hoses.
4. Remove the two screws on the pump mount (one on
each side of mount).
5. Lift the pump assembly out of the machine and
place on a at surface.
6. Remove and inspect the O-ring(s) on end of the
pump for wear or damage. Replace if needed.
7. Put a small amount of hydraulic oil onto the O-Ring
and reinstall.
8. Align the 2 mounting holes with the mounting on the
pump.
9. Reattach with the two mounting screws and torque
to 89 ft. lbs. (12 N•).
10. Remove plug caps and reconnect hydraulic hoses
to pump as previously labeled.
11. Check hydraulic oil level. Add more if needed.
12. Start the paver and check to be sure there are no
hydraulic oil leaks.
13. Let machine idle approximately 10 minutes to allow
the pump and motor cases to ll with hydraulic oil.
14. Slide drive motor out of slide mount.