Toro Groundmaster Series Service Manual page 116

Test Procedure – Front Wheel Motor
Hydraulic System: Testing the Hydraulic System
Wheel motor efficiency is the second in a series of tests recommended to
determine traction circuit performance. Too much hydraulic fluid flow through a
single stationary wheel motor under load indicates an internal leak in the wheel
motor. A worn wheel motor is less efficient. Eventually, enough fluid by−pass will
cause the wheel motor to stall under heavy load conditions. Continued operation
can generate excessive heat, cause damage to seals and other components in
the hydraulic system, and affect overall machine performance.
There are moments during wheel motor operation (geroller position) when fluid
flow through the motor is less restricted. If a wheel motor is tested in this
position, the test results will be higher should not be used to determine wheel
motor efficiency. Test wheel motors in three (3) different wheel positions to obtain
accurate test results. Record test readings for all three (3) wheel positions and
use the average for the final test result.
Special Equipment Required:
•
Flow meter with pressure gauge that has at least a 57 L/minute (15
gallons/minute) capacity.
•
2 Hydraulic Hoses
Refer to Traction Circuit Component Failure (page 5–5)
information regarding the importance of removing contamination
from the traction circuit.
1. Park the machine on a level surface, lower the cutting unit (or attachment),
and set the key switch to the O
2. Read and adhere to the information provided in
(page 5–22).
3. Ensure that the traction pedal is correctly adjusted for the N
refer to Adjusting the Traction System for Neutral (page
that the hydraulic pump is at full stroke when traction pedal is pressed fully in
forward position.
4. Attach a heavy chain to the rear of the machine frame and an immovable
object to prevent the machine from moving during testing. Remove as much
slack in the chain as possible.
5. Block the wheel being tested with a chock to prevent the wheel from rotating
during testing.
To accurately test a front wheel motor on a 2WD machine, the front wheel motor
not being tested must be disconnected from the traction circuit.
To accurately test a front wheel motor on a 4WD machine, the front wheel motor
not being tested and the rear wheel motor on the opposite side of the front motor
being tested must be disconnected from the traction circuit.
1. Clean the fittings and the hydraulic tube shown; refer to
IMPORTANT
position.
FF
Page 5–30
for
Testing the Hydraulic System
position;
EUTRAL
5–50). Also, ensure
Figure 31.
Groundsmaster ® 3200, 3300 and 3310
19240SL Rev A