Hydraulic Test Selection
Before beginning any hydraulic test, identify if the problem is related to the
traction circuit, steering circuit, hitch cylinder circuit, or the attachment circuit.
Once the faulty system has been identified, perform tests that relate to that circuit.
If a traction circuit problem exists, consider performing one or more of the
following tests: Charge Pressure Test, and/or Traction Pump (P1) and (P2) Flow
and Relief Valve Test.
If a steering or hitch cylinder circuit problem exists, consider performing one or
more of the following tests: Steering Relief Valve (RV1) Pressure Test, Hitch
Cylinder Test, Hitch Cylinder Relief Valve (RV2) Pressure Test, and/or Gear
Pump (P4) Flow Test.
If an attachment/loader/dump circuit problem exists, consider performing one
or more of the following tests: Circuit Relief Valve Pressure Test, and/or Gear
Pump (P3) Flow Test.
Note:
If an attachment motor performance is suspect, perform an Attachment
Motor Efficiency Test; refer to the attachment
Installation Instructions
or
Service
Manual
.
Traction Circuit Testing – Charge Pressure Test
Charge pressure testing involves recording the charge pressure with the
traction pump under no load (swash plates closed) and comparing that reading
to the charge pressure while the traction pump is under a moderate load
(swash plates open). Charge pressure under no load at each traction (piston)
pump can be viewed while the vehicle is stationary using the InfoCenter
SERVICE–TRACTION–TRACTION INPUTS–FRONT TRACTION and REAR
TRACTION readings. A procedure for checking the charge pressure while the
traction pump is under load for this machine is being developed. Contact your
local Toro Distributor for assistance
Traction Circuit Testing – Traction Pump (P1) and (P2) Flow and
Relief Valve Tests
The Outcross 9060 incorporates a tandem “dual” piston (traction) pump; one
pump to drive the front axle and the other to drive the rear axle. Traction pump
flow testing involves measuring the pump output flow in high range under load. A
procedure for testing the traction pump(s) flow and the relief valves operation
for this machine is being developed. Contact your local Toro Distributor for
assistance.
Each pump includes two pressure relief valves (forward and reverse flow) set
to open at 33,095 kPa (4800 psi). Relief valve testing involves increasing the
traction circuit load, verifying the relief valve opens at or near the specified
pressure. A procedure for testing the relief valve(s) operation for this machine is
being developed. Contact your local Toro Distributor for assistance.
Outcross 9060
Page 5–37
Hydraulic System: Testing the Hydraulic System
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