64
Lube System (3rd Gen)
Hydraulic System
The hydraulic system of the lubrication panel
is detailed on the hydrualic schematic. The
information below is meant to help the customer
interpret this schematic in the event they need
to troubleshoot issues or re-assemble the
plumbing.
Note that the diagram below is a simplied
representation of the system and not all of the
components are shown.
Components
Heat Exchanger - This component has two
parts: the core cools the lubricant to extract
heat from the system. The fan blows air over
the core and is driven by hydraulic uid. Fan
speed is designed to be 2500 RPM.
Pump - The pump is a two-section gear pump
and creates ow for both the fan motor circuit
and the bearing ow circuit.
Thermal Bypass - In the bearing ow circuit,
the thermal bypass sends hot oil to the cooler
and allows cool oil to bypass the cooler. The
thermal bypass will start sending oil to the
cooler at 100˚ F and will send all of the oil to
the cooler at 125˚ F.
Control Valve - The directional control valve
controls the motion of the Hydra Arm Lid Lift.
Pushing and pulling the lever will raise or lower
the VSI lid. It also sets relief pressure of the
circuit at 2500 psi (172 bar).
Fan Speed Valve - The fan speed valve is a
direct operated relief valve. This is nominally
set to 300 psi (21 bar) in order to achieve a fan
speed of 2500.
Cooling Fan Circuit - The only purpose of the
cooling fan circuit is to spin the fan motor. The
speed of the fan motor is regulated by the fan
speed relief valve. Most uid will ow from the
pump to the motor and back to tank through a
lter. Some amount of oil may ow over relief
and back to tank without spinning the motor.
Bearing Flow Circuit - The bearing ow circuit
exists to both cool the oil and send oil to the
bearing. The pump sends oil rst to the control
valve, then to the thermal bypass valve. The
thermal bypass valve sends hot oil to the
cooler and cold oil around the cooler. All of
the oil goes to the beraing where it cools and
lubricates the bearing. In the event that the
lever of the control valve is pulled, the uid is
diverted to the lid lift cylinder and then goes
to the bearing. Once the lever springs back
to neutral, all of the uid will go directly to
the bearing again. All of the ow through the
bearing is ltered before entering the tank.
Changing Fan Speed
The factory setting for the fan speed valve is
300 psi (21 bar). In order to adjust the valve,
use a hex key to turn the stem of the relief
cartrdige. Watch the pump pressure gauge to
nd the desired pressure. Higher pressure will
yield faster fan speed. Do not exceed 500 psi
(34 bar).
Maintenance
• Change hydraulic oil rst at 250 hours,
then every 1000 hours.
• Inspect lters weekly while the pump is
running and change as needed. The dirt
alarm will reach the yellow zone when they
need to be changed.
• Inspect cooler ns weekly and clean as
needed.
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