Toro Groundsmaster 7210, Service Manual

Page: 107 / 342

Perform the PTO pressure valve test if you identify a PTO engagement problem.
This test determines if the PTO pressure valve in the transmission is operating
correctly.
Test Procedure
1. Ensure that the hydraulic fluid is at normal operating temperature.
WARNING
Before disconnecting or doing any work on the hydraulic system,
release all the pressure in the system; refer to
Releasing Pressure
from the Hydraulic System (page 4–11) .
2. Park the machine on a level surface, lower the cutting deck (or implement),
shut off the engine, and set the parking brake.
3. Read all Warning, Cautions, and precautions listed at the beginning of this
section.
4. Clean the transmission area around the pressure valve test port.
5. Remove the plug from the pressure valve test port. Connect a 6,900 kPa
(1,000 psi) hydraulic pressure gauge with a hydraulic hose that is attached
to the test port.
6. Start the engine and run it at low-idle speed (1,400 rpm) . Check for
hydraulic-fluid leaks from the test connections and correct before continuing
the test.
7. With the engine running, move the throttle to full speed (3,000 rpm) .
WARNING
Keep away from the deck (or implement) during the test to prevent
personal injury.
8. Have an operator engage the PTO and monitor the pressure gauge.
9. With the engine running at full speed and PTO engaged, the pressure should
be 1,930 to 2,340 kPa (280 to 340 psi) .
10. Disengage the PTO and then shut off the engine. Record the test results.
11. If specification is not met, repair or replace the pressure valve in the
transmission; refer to Servicing the Transmission (page 4–75) . Also consider
a worn or damaged charge pump in the transmission (the traction charge
circuit will be affected as well).
12. Release pressure from the hydraulic system; refer to Releasing Pressure
from the Hydraulic System (page 4–11) .
13. Disconnect the test gauge from the pressure valve test port. Install the plug
into the port and torque the plug to 19 to 20 N∙m (14 to 15 ft-lb) .
Groundsmaster 7210 Page 4–47 Hydraulic System: Testing the Hydraulic System
16222SL Rev C