Spray System Valve Actuators - Toro Multi Pro 1750 Service Manual

Spray System Valve Actuators (ARAG − Serial Number Below 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.
Each actuator receives its power through individual 5
amp fuses. The fuse is located in the wire harness near
each valve actuator (see Fuses in this chapter).
The agitation valve and rate valve actuators are con-
trolled using a two (2) wire circuit. The polarity of the
power supplied changes to control the direction of actu-
ator operation.
The master boom and boom section valve actuators are
controlled using a three (3) wire circuit. A constant sup-
ply of power is applied to terminals 1 (+) and 2 (−), ener-
gizing the actuator to close the valve. Applying power to
terminal (3) reverses the direction of actuator operation,
opening the valve.
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. 75). Carefully
unplug machine wire harness connector from valve ac-
tuator and disconnect the hose from below the valve.
Two (2) wire operated actuators:
A. Connect 12VDC to terminal 1 (+) and connect ter-
minal 2 to ground (−). The actuator should rotate in a
counterclockwise direction to extend/close the
valve.
B. Connect 12VDC to terminal 2 (+) and connect ter-
minal 1 to ground (−). The actuator should rotate in a
clockwise direction to open/retract the valve.
Three (3) wire operated actuators:
A. Connect 12VDC to terminal 1 (+) and connect ter-
minal 2 to ground (−). The actuator should rotate in a
counterclockwise direction to extend/close the
valve.
B. Connect 12VDC to terminal 1 (+) and terminal 3
(activator), then connect terminal 2 to ground (−).
The actuator should rotate in a clockwise direction to
open/retract the valve.
Electrical System
2
3
1
5
1. Agitation valve
2. Rate valve
3. Master boom valve
4. Boom spray valves (3)
5. Valve actuator
6. Wire harness connector
3. If the actuator does not operate smoothly in both di-
rections, remove the valve piston and retest the actuator
(see Spray Valve Service in Chapter 6 − Spray System
in this manual). Replace the actuator if necessary.
4. If the actuator tests correctly and a circuit problem
still exists, check wire harness (see Electrical Schemat-
ic and Wire Harness Drawings in Chapter 10 − Electrical
Drawings in this manual).
5. Connect the machine wire harness to the valve actu-
ator after testing is completed.
Page 5 − 56
4
6
8
9
10
11
Figure 75
7. Fork
8. Hose
9. Actuator terminal 1
10. Actuator terminal 2
11. Actuator terminal 3
Multi Pro 1750
7