The Transmission Piston Pump Flow Test should be
performed if a traction circuit problem is identified. This
test will determine if hydraulic flow from a transmission
piston pump is correct.
8. Sit in the operator seat, start engine and run at low
idle speed (1500 to 1650 RPM). Check for any hydraulic
leakage from test connections and correct before pro-
ceeding with test.
Procedure for Transmission Piston Pump Flow
Test:
IMPORTANT: Do not run engine at full speed when
performing this flow test using Toro Hydraulic Tes-
ter (Pressure and Flow) (TOR214678). Traction
pump output at full engine speed can damage hy-
draulic tester.
1.
Make sure hydraulic oil is at normal operating tem-
perature. Also, make sure that traction drive is correctly
adjusted for the neutral position.
9.
throttle so engine speed is 2800 RPM (not full speed).
Using a phototac to measure engine speed, move
WARNING
10.Have
operator slowly push traction lever for pump
being tested to fully forward position. Leave other trac-
tion lever in neutral position.
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.
11.
Slowly close tester flow control valve until pressure
gauge reads 1000 PSI (69 bar). Verify with a phototac
that the engine speed is still 2800 RPM.
2.
(or implement) lowered and off. Make sure engine is off.
Park machine on a level surface with the cutting deck
12.Observe
approximately13.3 GPM (50.3 LPM) for a traction pump
flow gauge. TESTER READING should be
in good condition.
3.
Read Precautions for Hydraulic Testing listed at the
beginning of this section.
13.Open
tester flow control valve, release traction lever
to the neutral position and stop engine. Record test re-
sults.
WARNING
14.Normal
traction pump flow is 13.3 GPM (50.3 LPM).
Before jacking up the machine, review and follow
Jacking Instructions in Chapter 1 – Safety.
Lower pump flow would result in reduced traction circuit
performance. If flow is less than 11 GPM (41.6 LPM) or
a pressure of 1000 PSI (69 bar) cannot be obtained:
4.
Raise and support machine with jack stands so that
both rear wheels are off the ground. In this test, the rear
wheels need to spin freely to allow hydraulic flow
through the traction circuit. Make sure that the parking
brake is not applied.
A. The traction control lever may need adjustment.
B. If the engine speed drops excessively as the test-
er flow control valve is closed, engine performance
should be evaluated (see Chapter 3 – Kubota Diesel
Engine).
5.
Thoroughly clean transmission area surrounding
traction circuit hoses on top of transmission (Fig. 16).
Determine which piston pump is to be tested.
C. If engine speed does not drop and pressure and
flow specifications are not met, the tested transmis-
sion piston pump needs to be inspected, repaired or
replaced as necessary.
6.
Disconnect hydraulic hose from transmission pump
outlet fitting for piston pump to be tested (Fig. 16):
15.If
transmission piston pump flow specification is met,
Piston Pump to be Tested
Right Side Pump
Pump Outlet
Port A
and a traction circuit problem has been identified, con-
sider that a wheel motor is worn or damaged (see Wheel
Motor Efficiency Test in this section).
Left Side Pump
Port C
16.Relieve
hydraulic system pressure (see Relieving
7.
Install hydraulic tester (pressure and flow) in series
Hydraulic System Pressure in the General Information
section). Disconnect tester from transmission fitting and
hose. Reconnect hydraulic hose to transmission port fit-
ting.
between the pump outlet fitting and the disconnected
hose. Make sure that the tester flow arrow points from
the pump outlet and toward the hose. Make sure the
flow control valve on the tester is fully open.
17.If
necessary, repeat flow test for other transmission
piston pump.
Groundsmaster 7200/7210
Page 4 – 29
Hydraulic System
| Categories | Lawn Mower Manual, Sprinkler and Irrigation Manuals, Toro Sprinkler and Irrigation Manuals |
|---|---|
| Tags | Toro Groundsmaster 7200, Toro Groundsmaster 7210 |
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|
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| Language | English |
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My mower is a TORO 7210.
Start fuse defection. Why ?