The Implement Relief Pressure Test should be per-
formed if a cutting deck (or implement) raise and lower
problem is identified. This test will determine if the imple-
ment relief valve is operating correctly.
11.System pressure should be approximately 3000 PSI
(207 bar) as the implement relief valve lifts. Return lift
lever to the neutral position.
12.Stop
engine. Record test results.
Procedure for Implement Relief Pressure Test:
13.If
specification is not met, repair or replace imple-
1.
perature.
Make sure hydraulic oil is at normal operating tem-
ment relief valve in gear pump (see Gear Pump Service
in the Service and Repairs section of this chapter). Also
consider a leaking lift cylinder, a damaged lift control
valve or a worn gear pump.
2.
the neutral position.
Make sure that traction drive is correctly adjusted for
14.Relieve
hydraulic system pressure (see Relieving
Hydraulic System Pressure in the General Information
section). Disconnect T–connector with test gauge from
lift control valve fitting and hydraulic hose. Reconnect
hydraulic hose to control valve fitting.
WARNING
Before disconnecting or performing any work on
the hydraulic system, all pressure in the system
must be relieved. See Relieving Hydraulic System
Pressure in the General Information section.
1
3.
Park machine on a level surface with the cutting deck
(or implement) lowered and off. Make sure engine is off
and the parking brake is engaged.
4.
Read Precautions for Hydraulic Testing listed at the
beginning of this section.
2
5.
er fitting on rear of lift control valve (Fig. 22).
Thoroughly clean junction of hydraulic hose and low-
6.
Disconnect hydraulic hose from lower fitting on rear
of lift control valve (Fig. 22). This hose is from the gear
pump outlet and provides oil flow to the lift control valve
(Fig. 23).
Figure 22
1.
Lift control valve
2.
Hose from gear pump
NOTE: Implement relief pressure can also be tested
with hydraulic tester (pressure and flow). Connect tester
in series with the lift control valve fitting and the discon-
nected hose. Use pressure gauges on hydraulic tester
and follow procedure below.
RIGHT
FRONT
7.
(5000
Install T–connector with hydraulic pressure gauge
PSI / 345 bar) in series with the lift control valve
fitting and the disconnected hose.
2
8.
Start engine and run at low idle speed (1500 to 1650
RPM). Check for any hydraulic leakage from test con-
nections and correct before proceeding with test.
9.
(3200
With engine running, move throttle to full speed
RPM).
1
IMPORTANT: Hold lift lever in the raise position
only long enough to get a system pressure reading.
Holding the lift lever in the raise position for an ex-
tended period may damage the lift control valve.
Figure 23
1.
Gear pump
2.
Hose to lift control valve
10.Watch
pressure gauge carefully while moving lift le-
ver to the raise position and holding.
Groundsmaster 7200/7210
Page 4 – 37
Hydraulic System
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My mower is a TORO 7210.
Start fuse defection. Why ?