Multi Pro 1750
Page 5 − 46
Electrical System
Supervisor Key Switch
The supervisor key switch on the Multi Pro 1750 sprayer
is located on the control console to the right of the oper-
ator seat (Fig. 56). When the supervisor switch is in the
OFF (locked) position, the spray system pressure
switch is disabled, preventing spray system pressure
(application rate) adjustment.
Testing
1. Park machine on a level surface, stop spray pump,
stop engine and engage parking brake. Remove key
from ignition switch.
2. Remove console panel. Locate supervisor key
switch and remove wire harness connector from switch.
3. With the use of a multimeter (ohms setting), the key
switch functions may be tested to determine whether
continuity exists between the various terminals for each
switch position. The switch terminals are marked as
shown (Fig. 57). The circuitry of the supervisor key
switch is shown in the chart (Fig. 58). Verify continuity
between switch terminals.
NOTE: Only key switch terminals A and D are used on
Multi Pro 1750 machines.
4. Replace supervisor key switch if testing determines
the switch is faulty.
5. If the supervisor key switch tests correctly and a cir-
cuit problem still exists, check wire harness (see Electri-
cal Schematic and Wire Harness Drawings in Chapter
10 − Electrical Drawings in this manual).
6. After testing is completed, connect the harness con-
nector to the supervisor switch and install console panel
to machine.
1. Control console 2. Supervisor key switch
Figure 56
1
2
Figure 57
BACK OF SWITCH
FRONT OF SWITCH
45
ON (UNLOCKED)
OFF (LOCKED)
o
SWITCH
POSITION
NORMAL
CIRCUITS
OTHER
CIRCUITS
OFF (LOCKED) NONE B + C
ON (UNLOCKED) A + D B + C
Figure 58
Electrical
System
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