The Wheel Motor Efficiency Test should be performed
if a traction circuit problem is identified. This test will de-
termine if a wheel motor has excessive internal leakage
and wear.
8. Install hydraulic tester (pressure and flow) in series
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.
NOTE: Over a period of time, a wheel motor can wear
internally. A worn motor may by–pass oil to its case drain
causing the motor to be less efficient. Eventually,
enough oil loss will cause the wheel motor to stall under
heavy load conditions. Continued operation with a worn,
inefficient motor can generate excessive heat, cause
damage to seals and other components in the hydraulic
system and affect overall machine performance.
9. 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.
IMPORTANT: Do not run engine at full speed when
performing this test using Toro Hydraulic Tester
(Pressure and Flow) (TOR214678). Traction pump
output at full engine speed can damage hydraulic
tester.
Procedure for Wheel Motor Efficiency Test:
1.
perature. Also, make sure that traction drive is correctly
adjusted for the neutral position.
Make sure hydraulic oil is at normal operating tem-
10.Using a phototac to measure engine speed, move
throttle so engine speed is 2800 RPM (not full speed).
Make sure parking brake is applied to keep wheel from
rotating during test.
WARNING
CAUTION
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.
Use extreme caution when performing test. The
rear wheel that is being tested will be trying to
move the machine forward.
2.
(or implement) lowered and off. Apply parking brake and
make sure engine is off.
Park machine on a level surface with the cutting deck
11.
While sitting in operator seat, slowly push traction
control lever for wheel motor being tested in the forward
direction until 1000 PSI (69 bar) is displayed on the test-
er pressure gauge.
3.
Read Precautions for Hydraulic Testing listed at the
beginning of this section.
12.Wheel
motor internal leakage will be shown on the
tester flow meter in GPM (LPM).
4.
Attach a heavy chain to the rear of the machine frame
and an immovable object to prevent the machine from
moving during testing. As an alternative, machine can
be raised and supported with jack stands so that both
rear wheels are off the ground.
13.Return
traction control lever to the neutral position.
Shut off engine and record test results. Rotate wheel
and retest. Testing of wheel motor leakage in three (3)
different wheel positions will provide the most accurate
test results.
5.
Disconnect wire harness connector from parking
brake switch (see Parking Brake Switch in the Compo-
nents section of Chapter 5 – Electrical System). Install
jumper wire across harness connector terminals to al-
low traction circuit operation with the parking brake ap-
plied.
14.Flow
tested wheel motor. If specification is not met, the
tested wheel motor needs to be repaired or replaced.
should be less than 1.5 GPM (5.7 LPM) for the
15.Relieve hydraulic system pressure (see Relieving
Hydraulic System Pressure in the General Information
section). Disconnect tester from pump outlet fitting and
hydraulic hose. Connect hose to pump fitting.
6.
Thoroughly clean transmission area surrounding
traction circuit hoses on top of transmission (Fig. 18).
Determine which wheel motor is to be tested.
16.If
other wheel motor requires testing, complete steps
7.
outlet fitting for wheel motor to be tested (Fig. 18):
Disconnect hydraulic hose from transmission pump
6
to 15 for the remaining motor.
17.After
testing is completed, remove jumper wire from
parking brake harness connector. Connect wire harness
to parking brake switch (see Parking Brake Switch in the
Components section of Chapter 5 – Electrical System).
Make sure that brake switch operation is correct.
Wheel Motor to be Tested
Right Side Motor
Pump Outlet
Port A
Left Side Motor
Port C
Groundsmaster 7200/7210
Page 4 – 33
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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|
| Document Type | Service Manual |
| Language | English |
| Product Brand | Toro. Customer Service Representatives are available by phone:
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| Publisher | toro.com |
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My mower is a TORO 7210.
Start fuse defection. Why ?