Toro Groundsmaster 4300-D Service Manual page 112

Hydraulic System: Testing the Hydraulic System
wheel motor is less efficient. Eventually, enough fluid bypass will cause the
wheel motor to stall under heavy load conditions. Continued operation can
generate excessive heat, cause damage to the 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 and should not be used to determine wheel motor
efficiency. Test the wheel motors in 3 different wheel positions to obtain accurate
test results. Record the test readings for all the 3 wheel positions. In the forward
direction, hydraulic fluid flows through both front wheel motors (in parallel) before
passing through the rear wheel motor on the opposite side of the machine. In
the reverse direction, hydraulic flow bypasses the rear wheel motors. Start by
testing the front wheel motors combined, then test the front wheel or rear wheel
motors individually as necessary.
Special Equipment Required:
•
Pressure gauge
•
Flow meter with pressure gauge that has at least a 68 L/minute (18
gallons/minute) capacity
Refer to Traction Circuit Component Failure (page 4–7)
information regarding the importance of removing contamination
from the traction circuit.
g189656
1. Traction pump
2. Left elbow fitting
3. Hydraulic hose (reverse)
1. Park the machine on a level surface with the PTO switch off, lower the cutting
decks, shut off the engine, and set the parking brake.
2. Read all Warning, Cautions, and precautions listed at the beginning of this
section.
IMPORTANT
Figure 56
4. Hydraulic hose (forward)
5. Right elbow fitting
Page 4–50
for
Groundsmaster ® 4300-D
16226SL Rev C