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.
H
G
F
E
D
Testing
C
B
A
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.
CIRCUIT BOARD
DIODE DIAGRAM
Figure 39
Red Lead (+)
on
Terminal
Black Lead (−)
on
Terminal
Continuity
H
A
G
B
F
A
H
B
G
C
F
YES
NO
YES
NO
YES
NO
C
E
D
D
E
YES
NO
Electrical System
Page 5 − 26
Groundsmaster 4000−D
| Categories | Lawn Mower Manual, Toro Lawn Mower Manual |
|---|---|
| Tags | Toro Groundsmaster 4000 D |
| Download File |
|
| Document Type | Service Manual |
| Language | English |
| Document File Type | |
| Publisher | toro.com |
| Wikipedia's Page | Toro Company |
| Copyright | Attribution Non-commercial |
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