Toro Groundsmaster 4300-D Service Manual page 310

Testing the Pressure Transducer
Electrical System: Testing the Electrical Components
The hydraulic pressure transducer is installed on the forward traction hydraulic
tube located in between the front wheels
counterbalance pressure between the hydraulic motors and the hydraulic pump.
The TEC monitors the counterbalance pressure range using inputs from the
pressure transducer and controls the energizing of the hydraulic solenoid valves
used to drive the cutting deck motors.
1. Park the machine on a level surface, shut off the engine, and set the parking
brake.
2. Disconnect the machine wire harness from the pressure transducer.
3. Test the machine wire harness to the pressure transducer:
A. Turn the key switch to the O
B. To simulate a functioning pressure transducer, connect a 1.5 V dry cell
battery across the signal (+) pin C and ground (-) pin B of the machine wire
harness connector
approximately an 550 kPa (80 psi) reading on the InfoCenter display.
C. Use a multimeter set to DC voltage and check for 5 VDC across the
supply (+) pin A and ground (-) pin B of the machine wire harness
193B).
D. Turn the key switch to the O
4. Test the pressure transducer as follows:
A. Connect a 5 VDC power supply to the supply (+) pin A and ground (-) pin
B of the sensor connector
B. Connect a multimeter set to DC voltage to the signal (+) pin C and
ground (-) pin B of the sensor connector
of voltage should be present 0.5 VDC on the multimeter display.
5. Replace the pressure transducer if necessary. Apply thread sealant to the
threads of the transducer prior to installation.
6. After you complete the testing, connect the wire harness to the pressure
transducer.
(Figure
position.
N
(Figure 193A). A fully charged battery should produce
position.
FF
(Figure 193B).
Page 5–86
192). The transducer senses the
(Figure 193C). A small amount
Groundsmaster
16226SL Rev C
(Figure
® 4300-D