Toro 04861, Service Manual

Page: 118 / 234

Checking the Operation of Throttle and Clutch Bail Potentiometers
Check the operation of throttle and clutch bail potentiometers with the InfoCenter.
With the key switch in the O
N
position and the InfoCenter in the diagnostics
menu, choose the Throttle and ensure that the displayed voltage changes as the
speed wheel is rotated. Further potentiometer testing is necessary only if the
displayed voltage does not change when using the InfoCenter.
Testing the Throttle and Clutch Bail Potentiometers
1. Ensure that the cutting-unit-drive lever is in the D
ISENGAGE
position, park the
machine on a level surface, release the clutch bail, engage the service and
parking brake, rotate the key switch to O
FF
, and remove the key; refer to
the Operator's Manual .
2. Disconnect the battery pack; refer to Disconnecting and Connecting the
Lithium Battery Pack (page 5–3) .
3. Remove the handle cover from the handle to get access to the throttle and
clutch bail potentiometers.
4. Disconnect the machine wire harness connector from the potentiometer to be
tested, and remove the potentiometer from the machine ( Figure 60 ).
Note: Before taking the small resistance readings with a digital multimeter,
short the multimeter test leads together. The meter displays a small
resistance value (usually 0.5 ohms or less). This resistance is because of the
internal resistance of the multimeter and test leads. Subtract this value from
the measured value of the component that you are testing.
g202576
Figure 61
1. Terminal A 3. Terminal C
2. Terminal B
5. Use a multimeter, measure the resistances between the potentiometer
terminals as follows ( Figure 61 ).
A. Check that the resistance between the terminals B and C is approximately
5,000 ohms. Record the measured resistance.
B. Measure the resistance between the terminals A and C and then measure
the resistance between the terminals A and B. Record these resistances.
The total of the 2 measured resistances should be approximately 5,000
ohms.
C. Rotate the reel speed potentiometer to other settings and repeat the step
B. The total of the 2 resistances should consistently be approximately
5,000 ohms.
D. If measured resistances are incorrect, replace the speed control
potentiometer.
Electrical System: Testing the Electrical Components Page 5–34 Greensmaster ® eFlex 1021
20248SL Rev C