TESTING
9-4
TX 413 Service Manual
Rev. 000
TX 413 Hydraulic Testing
The TX 413 hydraulic system utilizes a single gear
pump to fl ow oil for all hydraulic components of the
unit. The TX 413 hydraulic system can be separated
into three circuits; loader, auxiliary and drive systems.
Each is an open circuit system which allows oil to be
fl owing when the valves and the hydrostatic pumps
are in the neutral position.
The gear pump draws the oil from the hydraulic
tank fl ows the oil through the hydraulic lines, hoses
and valves. The pump creates the system working
pressure and gallons per minute (gpm). Auxiliary and
loader circuits are connected in series, so both circuits
operate at the same pressure and fl ow.
The oil is drawn from the hydraulic tank by the gear
pump and fl ows into the loader valve, then into the
auxiliary valve. The loader valve relief valve regulates
the system pressure (psi). When the loader valve
handle is moved forward or back from neutral position
it directs the hydraulic oil to the lift cylinder. When the
loader valve handle is moved left and right it directs
hydraulic oil to the tilt cylinder.
The auxiliary valve directs hydraulic oil to the
attachment couplers. When the auxiliary lever is
moved toward the drive handle the female coupler is
pressurized and turns the attachment in the forward
drive. When the auxiliary lever is moved away from
drive handle the male coupler is pressurized and
turns the attachment in the reverse drive.
The drive system includes the two hydrostatic
pumps and wheel motors. The hydrostatic pumps
are supplied with low pressure oil returned from the
loader valve. This oil is fi ltered, then drawn into the
hydrostatic pumps. When the drive handle is moved
from neutral position, hydraulic oil is pumped to the
wheel motors that drive the tracks.
The recommended fl ow (gpm) and pressure (psi)
valves are located in the specifi cation section of this
manual for use in troubleshooting each circuit. The
following tests need to be done at various locations to
determine which component(s) may not be functioning
correctly.
Hydraulic testing needs to be done in a systematic
manner with a basic understanding of the hydraulic
system and functions. It is recommended to have the
hydraulic schematic for the model and serial number
being tested. Schematics are contained in this manual
or in the Toro Operator or Parts catalogs provided with
the unit.
Make sure engine RPM is checked and set properly
prior to any hydraulic testing.
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