Procedure for Wheel Motor Efficiency:
Over a period of time, a wheel motor can wear
10. Slowly push traction pedal in the forward direction
until1000 PSI is displayed on the tester pressure gauge.
Note:
internally. A worn motor may by–pass oil causing the
motor to be less efficient. Eventually, enough oil loss will
cause the wheel motor to stall under heavy load condi-
tions. Continued operation with a worn, inefficient motor
can generate excessive heat, cause damage to seals
and other components in the hydraulic system, and af-
fect overall machine performance.
11. With all drive wheels locked (not rotating), total in-
ternal leakage for all wheel motors will be shown on the
flow meter. Flow should be less than 2 GPM (7.6 LPM).
Record test results.
12.
13.
Release traction pedal and shut engine off.
If specification is not met, individual wheel motors
need to be removed from the traction circuit to deter-
mine which motor(s) is leaking excessively.
1.
perature by operating the machine for approximately 10
minutes. Make sure the hydraulic tank is full.
Make sure hydraulic oil is at normal operating tem-
A. For SP2020/3020 machines, a wheel motor can
be removed from the traction circuit by disconnect-
ing and capping the two hydraulic lines at the motor.
2.
ments lowered. Make sure engine is off and the parking
brake is engaged.
Park machine on a level surface with the attach-
B. For SP5020 machines, the front motor can be re-
moved from the traction circuit by disconnecting the
two hydraulic lines at the motor and then connecting
the hoses together to allow flow to the rear wheels.
A rear motor on a SP5020 can be removed from the
traction circuit by disconnecting and capping the
two hydraulic lines at the motor.
3.
Read Precautions for Hydraulic Testing.
4.
tral position (see Adjust Traction Drive for Neutral in the
Adjustments Section).
Make sure that traction pedal is adjusted to the neu-
5.
Attach a heavy chain between the rear of the ma-
chine frame and an immovable object to prevent the ma-
chine from moving during testing.
14. After removing a motor from the circuit, retest using
steps 6 through 10 making sure that the remaining drive
wheels are locked (not rotating) during testing. When a
worn motor is removed from the traction circuit, the test
results should show a decrease in leakage flow from the
system. Any wheel motor that has leakage greater than
6.
Install hydraulic tester (flow meter) using the same
tester connections as TEST NO. 1: Traction Pump Flow.
Make sure the tester flow control valve is fully open.
.7
GPM needs to be repaired or replaced.
7.
Make sure parking brake is engaged. On machines
with 3 wheel drive, chock the front wheel to prevent front
wheel rotation.
Example: consider a SP5020 that has a total internal
leakage of 3.5 GPM. When the right, rear wheel motor
is disconnected, the system leakage decreases to 1
GPM. The leakage for the disconnected motor is 2.5
GPM which indicates the need to repair or replace the
right, rear wheel motor.
8.
After installing hydraulic tester, start engine and run
at low idle speed. Check for hydraulic leakage and cor-
rect before proceeding with test.
Multiple wheel motors may be worn, so efficiency testing
of all wheel motors may be required. After an individual
motor is tested, reconnect that motor before proceeding
to test another motor.
CAUTION
Use extreme caution when performing test. The
drive wheels will be trying to move the machine.
15.
After testing is completed, disconnect tester from
machine and reconnect all hose connections.
9.
Move throttle to full speed (3150 + 50 RPM).
Sand Pro 2020/3020/5020
Page 4 – 27
Hydraulic System (Rev. A)
| Categories | Lawn Mower Manual, Sprinkler and Irrigation Manuals, Toro Sprinkler and Irrigation Manuals |
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| Document Type | Service Manual |
| Language | English |
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