Multi Pro 1750
Page 5 − 47
Electrical System
Boom Lift Switches
The right and left boom lift switches are identical
switches and are located on the control console
(Fig. 59). Pressing the front of a switch lowers the ap-
propriate spray boom section. Pressing the rear of a
switch raises the boom section.
The boom lift switch terminals 1, 2 and 3 are used to en-
ergize the boom up and down solenoids of the hydraulic
lift control manifold. Switch terminals 4, 5 and 6 are used
to energize the boom enable solenoid of the hydraulic lift
control manifold.
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 switch that is to be
tested and unplug wire harness connector from switch.
3. With the use of a multimeter (ohms setting), the
boom lift 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 in (Fig. 60) and the circuitry of the
boom lift switch is shown in the chart in (Fig. 61). Verify
continuity between switch terminals.
4. Replace boom lift switch if testing determines that it
is faulty.
5. If the switch tests 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. After testing has been completed, connect the wire
harness connector to the boom lift switch. Install con-
sole panel to machine.
1. Control console
2. LH boom switch
3. RH boom switch
Figure 59
1
2
3
Figure 60
BACK OF SWITCH
SWITCH
POSITION
NORMAL
CIRCUITS
OTHER
CIRCUITS
OFF 2 + 1 5 + 4
ON 2 + 3 5 + 6
Figure 61
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