Toro Groundsmaster 7210, Руководство по обслуживанию

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Test Procedure (continued)
4. Read all Warning, Cautions, and precautions listed at the beginning of this
section.
5. Clean the junction of the hydraulic hose and upper fitting on the front side of
the lift control manifold ( Figure 46 ).
6. Disconnect the hydraulic hose from the upper fitting on the front side of the
lift control manifold ( Figure 46 ). This hose is from the gear pump outlet and
provides fluid flow to the lift control manifold ( Figure 47 ).
7. Install a T-connector with a 34,500 kPa (5,000 psi) hydraulic pressure gauge
in series with the lift control manifold fitting and disconnected hose.
8. 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.
9. With the engine running, move the throttle to full speed (3,000 rpm) .
IMPORTANT
Press the lift switch to the R
AISE
position only until you get a system
pressure reading. Holding the lift switch in the R
AISE
position for an
extended period may damage the lift control manifold.
10. Monitor the pressure gauge carefully while you press the lift switch to the
R
AISE
position. The system pressure should be approximately 20,700 kPa
(3,000 psi) as the implement relief valve lifts.
11. Return the lift switch to the N
EUTRAL
position, shut off the engine, and record
the test results.
12. If specification is not met, repair or replace the implement relief valve in the
gear pump; refer to Servicing the Gear Pump (page 4–109) . Also, consider a
leaking lift cylinder, damaged lift control manifold, or worn gear pump.
Note: The implement relief valve pressure can also be tested with a
hydraulic tester (pressure and flow) in series with the gear pump fitting and
disconnected hose. Use the pressure gauges on the hydraulic tester and
follow
Testing the Implement Relief Pressure (Using Pressure Gauge) (page
4–48) .
13. Release pressure from the hydraulic system; refer to Releasing Pressure
from the Hydraulic System (page 4–11) .
14. Disconnect the T-connector with test gauge from the lift control manifold
fitting and hydraulic hose, and connect the hydraulic hose to the lift control
manifold fitting again.
Hydraulic System: Testing the Hydraulic System Page 4–50 Groundsmaster 7210
16222SL Rev C