Gravely Promaster 400 Service Manual page 51

3. If steps 2 and 3 check okay, the time delay is
functioning properly.
Fuse Holder
1. Set a VOM in the "Ohm" (Rx1) position.
2. Make a visual check of the fuse to determine that it
is not burned out. If the glass is clouded, check the
fuse with an ohm meter. A circuit (zero Ohms)
should be indicated.
3. Unplug the fuse holder and connect the Ohm
meter to the pins. A circuit (zero Ohms) should be
indicated.
4. If no circuit is indicated, replace the fuse holder.
Hour Meter
1. Turn the ignition key to the "On" position. The hour
meter should advance in time.
2. Replace the hour meter if it does not operate.
Solenoid
1. Connect a VOM set in the "12" volt D.C. position to
the post to which the starter cable is connected
and to the solenoid case. Turn the ignition switch to
the "Start" position. If a voltage is indicated, the
solenoid switch is functional.
2. If step "2" is not met, connect the voltmeter to the
small post that is connected to the ignition switch.
Turn the ignition switch to the "Start" position. A
voltage should be indicated. If the switch passes
this test (voltage to the coil) and fails the test in
step "2", replace the solenoid.
Interlock Switch (Safety)
1. Remove the questioned interlock switch from the
tractor.
2. Set a VOM in the "Ohm" (Rx1) position.
3. Connect the meter leads to the switch pins. No
circuit (infinity) should be indicated.
4. Push in on the interlock switch ball to activate the
switch. A circuit (zero Ohms) should be indicated.
5. Connect one of the VOM meter leads to the case
and sequentially touch the switch pins with the
other free lead. No Circuit (infinity) should be
indicated.
6. Replace the switch if it fails the above test.
Seat Switch
1. Set a VOM in the "Ohm" (Rx1) position.
2. Connect the meter leads to the seat switch pins.
No circuit (infinity) should be indicated.
3. Push in on the seat switch to activate the switch. A
circuit (zero Ohms) should be indicated.
4. Replace the switch if it fails the above test.
Fuel Shut Off Solenoid
1. If engine fails to start, verify, with the key switch in
the start position, that power (12 volts) is present at
the white lead to the fuel solenoid. If not, check
connector plug for securement, and proper contact
with terminals.
2. If engine starts but fails to continue running, verify
power (12 volts) is present at pin 30 of the relay
and subsequently at the red input wire to the fuel
shut off solenoid. If no power is found, suspect:
a. Bad time delay grounding point.
b. Bad time delay module.
c. Bad relay (Reference 8.5)
3. If no faults are found in power input, check
solenoid switch resistances, across wires:
a. White and Red verify 12 ohms resistance.
b. Black and Red: 12 ohms resistance
c. Black and White: 0.5 ohms resistance
4. If high resistance or open circuits are found replace
fuel solenoid.
Alternator
Refer to the Engine Manual.
Headlight
1. If headlight will not luminate with switch on, verify
power (12 volts) from red/white input wire to
ground. If power is present, verify good ground
contact. If all power readings are normal, check
resistance readings across the headlight terminals.
Resistance readings should be between 0.1 and
0.3 ohms. If high resistance or open circuit is
found, replace light.
Preheater Switch
1. If pre-heat switch is suspect of failure, verify with
key switch off, that power is present at the red input
wire to the switch terminal. Turn on pre-heat
switch. Verify power at red output wire to ground. If
power is present, switch is not problem. Suspect
the preheater component. Resistance readings
across the switch terminals should be 0.1 to 0.3
ohms. If no power is at output wire or resistance
readings are indication of an open circuit, change
switch.
Water Temperature
1. If temperature gauge or switch is in question,
remove wire lead to the temperature switch. Touch
to ground and verify temperature gauge pegs over.
If not, suspect bad gauge or lead wire. If gauge
does deflect, suspect bad switch.
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