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Groundsmaster 4000−DPage 5 − 26Electrical System
Diode Circuit Board
The circuit board contains four diodes (Fig. 39) 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 damaged, the diode circuit board
must be replaced.
Figure 39
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