Fuel Solenoid Adjustment; Testing Fuel Solenoid; Engine Troubleshooting - Grasshopper 721D H2 Operator's Manual & Parts List

FUEL SOLENOID ADJUSTMENT

Adjust cable between fuel shut-off solenoid and
engine fuel stop valve to provide full engagement
of the solenoid. The solenoid should bottom out
(be fully engaged) before fuel stop valve fully
engages stop (approx. .0625" to .125" [1.6 to 3.2
mm] gap).
The solenoid is designed to hold the engine fuel
stop valve open during operation. When the key
is turned on, the solenoid energizes and opens
the fuel valve. When the key is turned off, the
solenoid releases and allows the fuel stop valve
to close.

TESTING FUEL SOLENOID

Adjust cable as described on previous page.
This model solenoid will not engage until en-
gine is cranked. Disconnect shut-off cable from
fuel shut-off lever and operate start switch.
After briefl y cranking the engine and with the
key switch in the run position, the fuel solenoid
should be engaged (pulled in). If it does not
engage, check for a blown in-line fuse at the
starter. If the fuse is not blown, test the solenoid
as follows.
Unplug the wires leading to the fuel solenoid.
Using an ohmmeter set on the X 1 OHM scale,
connect meter leads to solenoid wires. Correct
meter readings should be:
"Comm" wire to "Pull" wire - .25 ohms
"Comm" wire to "Hold" wire - 14 to 16
ohms
If you do not get these readings or one of the
circuits reads open, the solenoid is defective and
must be replaced.

ENGINE TROUBLESHOOTING

Should you experience trouble in starting the
engine, use the following guide to locate pos-
sible causes.
Engine will not crank:
• Battery is discharged.
• Blown starter fuse.
• PTO switch is "ON".
• Steering levers are not out in neutral.
• Steering lever switches are out of adjustment
(listen for the switch "click").
• A loose wire or connection.
Engine cranks, but will not start:
Determine if the fuel solenoid is stroking when
the key switch is turned to the start position. If it
is not, check for a blown fuse at the starter (item
17, page 43). If the fuse is not blown, check for
voltage in the black wire at the fuel solenoid plug
while the engine is cranking. If there is voltage
to the solenoid while the engine is cranking, go
to solenoid testing in the previous section.
If fuel shut-off solenoid is stroking but the en-
gine will not start, it is possible the fuel line has
become fi lled with air. The possible causes of a
fuel line fi lled with air are:
• Running fuel tank empty before refueling.
• Plugged fuel fi lter.
• Loose or broken fuel line connection.
To bleed the air from the fuel lines follow the
procedure outlined. Refer to "Engine Manual"
for illustrations of the parts described.
• Unplug the fuel shut-off solenoid (item 30
page 31).
• Loosen air vent plugs on the fuel fi lter sev-
eral turns. Crank the engine until bubbles
do not come out any more. Tighten air vent
plugs.
• Loosen air vent plug on top of the fuel injec-
tion pump. Crank the engine until bubbles
do not come out anymore. Tighten air vent
plug.
IMPORTANT
Cranking the engine for more than 15
seconds at a time can burn out the fuel
solenoid and can lead to premature
starter failure.
• Connect the fuel shut-off solenoid.
• If engine will not start after bleeding air from
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