LeeBoy 8515E - Component Replacement Procedures

5-32 LeeBoy 8515E Conveyor Paver
Maintenance
REPLACEMENT PROCEDURES
Gear PumpsGear Pumps
Hydraulic uid is transmitted throughout the machine to
motors and cylinders, becoming pressurized according
to the resistance present. The uid is controlled by
valves and distributed through hoses and tubes. The
tandem propel (drive) pump, tandem pump, and tandem
axillary pump play a signicant role in producing
hydraulic power by supplying hydraulic uid to system
components. (Figure 5-35)
The tandem ear and tandem drive pumps are accessible
from the right side of the paver. The tandem gear pump
is attached tot eh tandem drive pump (just behind it).
Both are easily reached via the left access panel. The
auxilliary gear pump is easier to access from the front
access panel inside the hopper.
Tandem
Gear Pump
(Augers)
Tandem
Drive Pump
Tandem Auxilliary
Gear Pump
(Charge and Conveyors)
Electric Screed
Tandem Gear Pump
Figure 5-35. Tandem Gear Pumps
Use the following procedure for replacing either of the
pumps:
1. Access the pump slated for replacement.
2. Label and disconnect the hoses to the pump,
capping the hoses and ttings on the pump.
The gear pump assemblies are very
heavy and must be properly supported with a sling
before continuing the following steps. DO NOT
loosen mounting bolts unless the pump is sufciently
supported.
3. Remove the two bolts on the pump mount (one on
each side of mount). (Figure 5-36)
Propel Pump
Bolts (2)
Tandem
Pump Bolts (2)
Figure 5-36. Hydraulic Pump Assemblies
4. Using the sling, carefully lift the pump assembly out
of the machine and place on a at surface.
5. Remove and inspect the O-ring(s) on end of the
pump for wear or damage. Replace if needed.
6. Put a small amount of hydraulic oil onto the O-Ring
and reinstall.
7. Align the new pump with the two mounting holes and
reattach pump.
8. Refer to Torque Tables in Section 2 and torque
bolts.
9. Prell the pump with hydraulic oil.
Failure to prell the pump before
starting the engine can damage the pump.
10. Remove plug caps and reconnect hydraulic hoses
to pump as previously labeled.
11. Check hydraulic oil level. Add more if needed.
12. Turn the ignition key to Start without starting the
engine a few times to “bump” the engine enough
for hydraulic oil to ow to the pump, then start the
engine.
13. With the engine running, check for leaks.
14. If no leaks are noted, let machine idle approximately
10 minutes to allow the pump and motor cases to ll
with hydraulic oil before operating.