Groundsmaster 4000--D
Page 5 -- 30
Electrical System
Diode Circuit Board
The circuit board contains four diodes (Fig. 48) and is lo-
cated under the console housing. The diodes are used
for circuit protection from inductive voltage spikes that
occur when a hydraulic valve solenoid is de--energized.
Diode D1 is in the left cutting deck circuit, D2 is in the
Transport/Mow circuit, D3 is in the front cutting deck cir-
cuit and D4 is in the right cutting deck circuit.
Testing
The diodes can be individually tested using a digital
multimeter (ohms setting) and the table to the right. If
any of the diodes are faulty, the diode circuit board must
be replaced.
Apply dielectric grease (Toro part number 107--0342) to
circuit board contacts whenever the circuit board is
installed into the wire harness.
Figure 48
H
A
B
C
D
E
F
G
D2
D4
D3
D1
DIODE DIAGRAM
CIRCUIT BOARD
Red Lead (+)
on
Terminal
Black Lead (--)
on
Terminal
Continuity
H
A
YES
A
H
NO
G
B
YES
B
G
NO
F
C
YES
C
F
NO
E
D
YES
D
E
NO
Содержание Groundsmaster 4000-D
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