Toro Groundsmaster 7210 Service Manual page 92

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 the 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.
IMPORTANT
Page 4–32 Groundsmaster 7210
16222SL Rev C