Service Manual

Multi Pro 5800Page 6 − 60Electrical System
Boom Lift Switches
The two (2) boom lift switches are used to raise or lower
the spray booms. When the right side boom switch is
pressed, solenoid valve S3 in the lift manifold is ener-
gized to allow hydraulic flow to the right side boom lift
cylinder. When the left side boom switch is pressed, so-
lenoid valve S2 in the lift manifold is energized to allow
hydraulic flow to the left side boom lift cylinder. In each
case, the upper solenoid valve coil is energized to raise
the boom and the lower solenoid valve coil is energized
to lower the boom. These switches are located on the
console assembly (Fig. 81).
Testing
1. Park machine on a level surface, stop engine and en-
gage parking brake. Remove key from ignition switch.
2. Remove console cover(s) to gain access to switch to
be tested (see Console Assembly in Chapter 9 − Chas-
sis in this manual).
3. Locate the switch to be tested and disconnect the
wire harness electrical connector from the switch.
4. With the use of a multimeter (ohms setting), the
switch functions may be tested to determine whether
continuity exists between the various terminals for each
position. The switch terminals are marked as shown
(Fig. 82) and the circuitry of the boom lift switches is
shown in the chart (Fig. 80). Verify continuity between
switch terminals.
SWITCH
POSITION
CLOSED
TERMINALS
OPEN
TERMINALS
RAISE 2 + 1, 5 + 4 2 + 3, 5 + 6
OFF NONE ALL
LOWER 2 + 3, 5 + 6 2 + 1, 5 + 4
Figure 80
5. Replace switch if necessary.
6. If the switch tests correctly and a circuit problem still
exists, check the wire harnesses (see Electrical Sche-
matics and Wire Harness Drawings and Diagrams in
Appendix A in this manual).
7. Connect the wire harness connector to the switch af-
ter testing is complete.
8. Install control console covers (see Console Assemb-
ly in Chapter 9 − Chassis in this manual).
1. Console assembly
2. Right boom lift switch
3. Left boom lift switch
Figure 81
1
2
3
Figure 82
BACK OF SWITCH
NOTE: Boom lift switch terminals 4, 5 and 6 are not
used on Multi Pro 5800 machines.