Traction Unit Testing − Wheel Motor Efficiency Tests - Toro Reelmaster 3100-D Service Manual

Traction Unit Testing − Wheel Motor Efficiency Tests
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Hydraulic System: Testing
Model 03171 (shown)
Wheel motor efficiency is the second in a series of tests recommended to
determine traction circuit performance. Hydraulic fluid flow of 5.7 LPM (1.5 GPM)
or more through a 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.
Hydraulic fluid flows through both front wheel motors (in parallel) before passing
through the rear wheel motor (in series). In this configuration, the rear wheel
motor can mask front wheel motor performance issues, and the front wheel
motors can mask rear wheel motor performance issues. Start by testing both
front wheel motors together, then individually if necessary. Finish by testing
the rear wheel motor.
Special Equipment Required:
•
Pressure Gauge
•
Flow Meter with Pressure Gauge that has at least an 68 LPM (18 GPM)
capacity
•
Phototach (non−contact tachometer)
Figure 39
Page 5–32 Reelmaster ® 3100-D/3105-D
20252SL Rev A