Grasshopper 718D, Руководство по обслуживанию

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MODELS 720, 721, AND 725.
1. Control relay - inspection.
A. Control relay A has 2 red wires, 1
black wire, and 1 yellow wire in the
relay socket.
B. Control relay B has 3 blue wires and
1 yellow wire in the relay socket.
2. Assuming the main fuse, PTO fuse,
ignition fuse are good, failure of control
relay A or associated wiring will be
evidenced by the following three symp-
toms:
A. PTO clutch will not engage.
B. Hourmeter will not run.
C. Ignition coil will not have any volt-
age on the positive terminal.
3. Assuming the start fuse is good, failure
of control relay B or associated wiring
will result in starter solenoid not engag-
ing; thus the starter motor will not
operate.
MODELS 718D AND 721D.
1. Control relay - inspection.
A. Control relay A has 2 red wires, 1
black wire, and 1 yellow wire in the
relay socket.
B. Control relay B has 3 blue wires and
1 yellow wire in the relay socket.
2. Assuming the main fuse, PTO fuse,
ignition fuse are good, failure of control
relay A or associated wiring will be
evidenced by the following three symp-
toms:
A. PTO clutch will not engage.
B. Hourmeter will not run.
C. Fuel solenoid will pull in but not
hold.
3. Assuming the start fuse is good, failure
of control relay B or associated wiring
will result in starter solenoid not engag-
ing; thus the starter motor will not
operate.
TROUBLESHOOTING CONTROL RELAYS
Figure 1
A
B
Blue
Red
Blue
Bla ck
Yellow
Red
Yellow
Blue
+ 12 volts w ith k ey
sw itch in 'START'
position
This w ire goes to
ground w ith steering
levers out a nd PTO off
+ 12 volts w hen rela y
'B' is energized
+ 12 volts
w ith k ey
sw itch in
'RUN'
position
+ 12 volts w hen rela y
'A' is energized
This w ire goes to ground w hen:
1. Driver on sea t a nd pa rking bra ke relea sed,
2. or PTO off, both steering levers out,
3. or both of the a bove.
To m a in
fuse
To pa d
M of PC
boa rd
To pa d
A of PC
boa rd
To PTO
fuse &
ignition
fuse
To sta rt
fuse
To sta rt
fuse
To pa d
R of PC
boa rd
Sta rter
solenoid