Toro Groundsmaster 7210 Service Manual page 98

Test Procedure
Hydraulic System: Testing the Hydraulic System
Perform the transmission piston pump flow test if you identify a traction circuit
problem. This test determines if hydraulic flow from a transmission piston pump
is correct.
1. Ensure that the hydraulic fluid is at normal operating temperature.
2. Ensure that the traction drive is correctly adjusted for the N
Before disconnecting or doing any work on the hydraulic system,
release all the pressure in the system; refer to
from the Hydraulic System (page
3. Park the machine on a level surface, lower the cutting deck (or implement),
and shut off the engine.
4. Read all Warning, Cautions, and precautions listed at the beginning of this
section.
Before lifting the machine with a jack, review and follow
Instructions (page 1–6).
5. Lift and support the machine with jack stands so that the 2 rear wheels are off
the ground. In this test, the rear wheels need to spin freely to allow hydraulic
flow through the traction circuit.
Note: Ensure that the parking brake is not applied.
6. Clean the transmission area around the traction circuit hoses on the top of
the transmission (Figure
7. Disconnect the hydraulic hose from the transmission pump outlet fitting to
test the piston pump
Piston Pump to be Tested
Right side pump
Left side pump
8. Install a hydraulic tester (pressure and flow) in series between the pump
outlet fitting and disconnected hose. Ensure that the tester flow arrow points
from the pump outlet and toward the hose. Ensure that the flow-control valve
on the tester is fully open.
9. Sit in the operator seat, start the engine and run it at low-idle speed (1,400
rpm). Check for any hydraulic-fluid leaks from the test connections and
correct before continuing the test.
Do not run the engine at full speed when performing this flow test
using Toro hydraulic tester (pressure and flow) (TOR214678). The
traction pump output at full engine speed can damage the hydraulic
tester.
WARNING
4–11).
IMPORTANT
41). Determine which piston pump is to be tested.
(Figure 41):
IMPORTANT
Page 4–38
position.
EUTRAL
Releasing Pressure
Jacking
Pump Outlet
Port A
Port C
Groundsmaster 7210
16222SL Rev C