5-34 LeeBoy 8520C Conveyor Paver
Maintenance
Two-Speed Hydraulic MotorsTwo-Speed Hydraulic Motors
1. Move paver onto a ramp where you can access the
undercarriage.
2. Disconnect, label and plug ttings on hydraulic
hoses to the hydraulic motors. (Figure 5-41)
Hydraulic
Motors
Torque Hubs
(Both Sides)
Figure 5-41. Hydraulic Motors and Torque Hubs
3. Place blocks sufcient to support the hydraulic
motors underneath them.
4. Remove the two screws and lock washers attaching
the hydraulic motor to the torque hub and carefully
separate motor from the torque hub. (Figure 5-42)
Figure 5-42. Remove Hydraulic Motor
5. Remove the O-Ring and drain hydraulic oil from the
motor. Discard or repair the motor as appropriate.
6. Lubricate a new O-ring with hydraulic oil and install
onto the torque hub.
7. Reattach new or rebuilt hydraulic motor to torque
hub and torque screws (Refer to Torque Tables in
Section 2.)
8. Reconnect hydraulic hoses.
9. Start the engine and let machine idle for 10 minutes
to work air out of the hydraulic system.
10. Check for any leaks.
Hydraulic Pump/Motor Start-UpHydraulic Pump/Motor Start-Up
Pre-StartPre-Start
If the hydraulic system is down as a result of a major
component failure:
1. Drain and clean the tank and system components
(hoses, valves, ttings and cooler) to ensure it is
free from metallic debris and other contamination.
Failure to do so may result in damage to the pump(s)
and/or other components on start-up.
2. Change all the lters.
3. Change the uid. On large systems where the cost
of changing the uid may be prohibitive, the uid
should be ushed until a cleanliness level of ISO
4406 18/13 or better is achieved.
Installation and Start-UpInstallation and Start-Up
When installing hydraulic motors, it is important that the
mounting ange of the motor makes full contact with the
mounting surface of the application. Mounting hardware
of the appropriate grade and size must be used:
1. Use Grade 8 socket-head capscrews to attach the
motor.
2. Install lock washer over capscrew. (Figure 5-43)
3. Apply Loctite 243 (blue) to the capscrew threads.
4. Install extra thick, hardened H-D thick washers over
the capscrew.
5. Install the capscrew-hardened washer and lock
washer in the SAE two-bolt ange.
6. Torque the capscrew to the wet torque value
dened for the capscrew grade and size.
It is CRITICAL to use the correct
mounting hardware.
Hubs, pulleys, sprockets and couplings must be prop-
erly aligned to avoid inducing excessive thrust or radial
loads. Although the output device must t the shaft
tightly, a hammer should never be used to install any
type of output device onto the shaft. The port plugs
should only be removed from the motor when the
system connections are ready to be made.
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