Spray System Valve Actuators - Toro Multi Pro 1750 Service Manual

Spray System Valve Actuators (KZ − Serial Number Above 315000000)
The Multi Pro 1750 spray system uses a variety of
valves to control the spray product flow (see Chapter 6
− Spray System in this manual). Each valve has a
12VDC actuator (motor) that can be tested individually.
The master boom, boom section valves, and agitation
valve actuators are controlled using a three (3) wire cir-
cuit. A constant supply of power is applied to terminals
A (+) and B (−), energizing the actuator to close the
valve. Applying power to terminal (C) reverses the direc-
tion of actuator operation, opening the valve.
The rate valve actuator is controlled using a four (4) wire
circuit. A constant supply of power is applied to terminals
A (+) and B (−). Applying power to the open terminal (C)
or the close terminal (D) controls the direction of actua-
tor operation.
Testing
1. Park machine on a level surface, stop spray pump,
stop engine and engage parking brake. Remove key
from ignition switch.
IMPORTANT: Make sure to neutralize and remove
chemicals from pump and hoses before loosening
and removing spray system components. Wear pro-
tective clothing, chemical resistant gloves, and eye
protection during repair.
2. Locate valve actuator to be tested (Fig. 76). Care-
fully unplug machine wire harness connector from valve
actuator, remove the retaining fork and remove the actu-
ator from the valve assembly.
Three (3) wire operated actuators:
A. Connect 12VDC to terminal A (+ red wire) and
connect terminal B to ground (− black wire) The actu-
ator should rotate in a clockwise direction, stop, and
a red LED should illuminate.
B. Connect 12VDC to terminal A (+ red wire) and ter-
minal C (open white wire), then connect terminal B to
ground (− black wire). The actuator should rotate in a
counterclockwise direction, stop, and a green LED
should illuminate.
Four (4) wire operated actuators:
A. Connect 12VDC to terminal A (+ red wire) and
connect terminal B to ground (− black wire). The ac-
tuator should not rotate in either direction.
Multi Pro 1750
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2
1
10
A B C
1. Rate valve
2. Agitation valve
3. Master boom valve
4. Boom spray valves (3)
5. Valve actuator
6. Wire harness connector
B. Connect 12VDC to terminal A (+ red wire) and ter-
minal C (open white wire), then connect terminal B to
ground (− black wire). The actuator should rotate in a
clockwise direction, stop, and a red LED should illu-
minate.
C. Connect 12VDC to terminal A (+ red wire) and ter-
minal D (close green wire), then connect terminal B
to ground (− black wire). The actuator should rotate
in a counterclockwise direction, stop, and a green
LED should illuminate.
3. If actuator dose not operate smoothly in both direc-
tions, replace the actuator.
4. If the actuator tests correctly, test the valve operation
by manually rotating the valve shaft with a screwdriver.
Repair or replace the valve if necessary (see Spray
Valve Service in Chapter 6 − Spray System in this manu-
al).
5. If the actuator and valve test correctly and a circuit
problem still exists, check wire harness (see Electrical
Schematic and Wire Harness Drawings in Chapter 10 −
Electrical Drawings in this manual).
6. Install the valve actuator and connect it to the ma-
chine wire harness after testing is completed.
Page 5 − 57
4
6
8
11
A B C D
Figure 76
7. Fork
8. Valve closed (red LED)
9. Valve open (green LED)
10. 3 Wire connector
11. 4 Wire connector
Electrical System
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7
9