Testing The Traction System Operation - Toro Groundsmaster 360 Service Manual

Testing the Traction System Operation

Hydraulic System: Testing the Hydraulic System
Use 2 people to perform all the tests, with 1 person in the seat and
the other to read and record the test results.
1. Clean the machine fully before you disconnect or disassemble the hydraulic
components.
Note: Cleanliness is required whenever you work on the hydraulic
equipment. Contamination causes too much wear on hydraulic components.
2. When you perform tests on the hydraulic system, wear eye protection.
3. Before you perform a test, check the traction control lever linkages for
improper adjustment, binding, or broken parts.
4. Perform all the hydraulic tests with the hydraulic fluid at normal operating
temperature.
5. Install clean metal caps or plugs on the hydraulic lines that are left open or
exposed during the testing or component removal.
6. When you use a hydraulic tester (pressure and flow), ensure that the inlet and
outlet hoses are properly connected and not reversed to prevent damaging
the hydraulic tester or components.
7. Install the hydraulic fittings by hand and ensure that they are not
cross-threaded before you tighten them with a wrench.
8. Position the tester hoses to prevent the rotating machine parts from
contacting and damaging the hoses or tester.
9. After you connect the test equipment, check the hydraulic-fluid level in the
hydraulic tank and ensure that the tank has the correct fluid level.
10. When you use a hydraulic tester (pressure and flow), open the tester load
valve fully before you start the engine to reduce the possibility of damaging
the components.
11. Ensure that the engine is in good operating condition before performing any
hydraulic test.
Note: Use a phototac when you perform a hydraulic test. The engine speed
can affect the accuracy of the tester readings.
12. If there is a traction circuit problem, perform 1 or more of the following tests:
charge relief valve pressure, transmission piston pump flow, traction relief
valve pressure, and/or wheel motor efficiency.
13. If there is a lift circuit problem, perform 1 or more of the following tests:
implement relief pressure, gear pump flow, and/or lift cylinder internal
leakage.
14. If there is a PTO circuit problem, perform the PTO pressure valve test.
15. If there is a steering circuit problem, perform 1 or more of the following tests:
implement relief pressure and/or gear pump flow.
Because the traction system of the Groundsmaster 360 machine uses 2 different
but interconnected circuits, it is difficult to identify which circuit is causing a
problem and what hydraulic tests should be performed. Use the following
operation tests and suggestions before you perform the hydraulic tests described
in this section.
1. The wheel speed should be the same on the 2 rear wheels. Ensure that the
hydraulic fluid is at normal operating temperature. With the machine drive
IMPORTANT
Page 4–40 Groundsmaster 360
16225SL Rev C