Toro Dingo TX 525, Service Manual

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HYDRAULIC TESTING
9-4 Rev. 000 TX525 Service Manual
1. Cycle the hydraulic oil until warm.
2. Park the unit on level ground.
3. Set the park brake.
4. Shut the engine off.
5. Cycle the auxiliary valve to relieve any pressure from
the circuit.
6. Wipe the couplers clean.
7. Push the pressure gauge male coupler into the
female coupler on the traction unit (Fig. 1844).
Fig 1844 PICT-3401
8. Start the engine and run at full throttle.
9. Activate the auxiliary valve handle and hold. View
the pressure gauge and take a reading.
10. Specification is 3000 psi (206.8 bar).
Note: Make sure the engine RPM is checked and set
properly prior to any hydraulic testing.
This test checks the auxiliary circuit system pressure.
The components involved in this test are: gear pump,
auxiliary valve, auxiliary couplers and hoses.
A pressure test can be done by using a flow type or a
non-flow type tester. Each tester has its own advantages
and disadvantages.
Flow Type
Advantages of a flow type tester are that pressure
and flow can be obtained with this one tester and
the hydraulic load can applied slowly to compare the
relativity between pressure and flow. Restrictor on flow
meter can be adjusted prior to activating the hydraulic
valve for pressure testing.
Disadvantages of flow type tester are the expense and
the hydraulic load is slowly applied so engine rpm can
be overcome prior to reaching recommended system
pressure.
Non-Flow Type
Advantages of a non-flow type tester are they are
simpler, less expensive and fewer steps to obtain test
results. The hydraulic load is applied quickly and system
pressure can be obtained prior to engine rpm being
overcome.
Disadvantage of non-flow type tester is it can only be
used for pressure testing.
This manual will be using a flow type tester for the
hydraulic testing. A non-flow tester can also be used to
obtain hydraulic pressure readings.
Auxiliary Circuit Pressure Test