Toro Groundsmaster 4300-D Service Manual page 113

Testing the Front Wheel Motors
Groundsmaster ® 4300-D
16226SL Rev C
3. Ensure that the traction pedal is correctly adjusted for the N
refer to the Operator's Manual.
4. Attach a heavy chain to the rear of the machine frame and an immovable
object to prevent the machine from moving during testing.
Hydraulic fluid flows through both front wheel motors (in parallel) before passing
through the rear wheel motors (in series). To accurately test the front wheel
motors, the rear wheel motors must be removed from the traction circuit.
1. Warm oil after test equipment is connected to prevent technician from
working on a hot machine—applicable to tests when possible (any test that
requires an open un-pluged/capped line (case drain tests) would not apply
and oil should be warmed before disconnecting the lines).
Before opening the hydraulic system, operate all the hydraulic
controls to release system pressure and avoid injury from the
pressurized hydraulic fluid; refer to
Hydraulic System (page
2. Clean the junction of the hydraulic hose and right side elbow fitting on the
bottom of the traction pump. Disconnect the hydraulic hose from the right
side of the pump fitting
Ensure that the fluid flow indicator arrow on the flow meter is
showing that the fluid will flow from the pump, through the tester,
and into the disconnected hydraulic hose.
3. Install a tester with the pressure gauge and flow meter in series between the
traction pump and disconnected hydraulic hose. Ensure that the flow control
valve on the tester is fully open.
4. Disconnect both the hydraulic lines from each rear wheel motor, then
connect the lines to each other. Plug the ports in wheel motors to prevent
contamination.
5. Block the front wheels with chocks to prevent wheel rotation.
6. With the engine running, press the engine speed switch to full speed (3,005
to 3,055 rpm) position. Use the InfoCenter to check that the engine speed is
correct.
The front wheel motors will try to move the machine forward.
Use extreme caution when performing the test.
7. Slowly press the traction pedal in the forward direction until 6,900 kPa (1,000
psi) is displayed on the tester pressure gauge. Ensure that the front wheels
are not rotating and record the flow meter reading.
8. Release the traction pedal, shut off the engine, rotate both the front wheels
90° and then test again. Release the traction pedal, shut off the engine,
CAUTION
Releasing Pressure from the
4–6).
(Figure 56).
IMPORTANT
CAUTION
Page 4–51 Hydraulic System: Testing the Hydraulic System
position;
EUTRAL