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Identifying the Relays and their Functions
Testing Relays with 5 Terminals
Electrical System: Testing the Electrical Components
optional wireless hour meter kit includes an additional relay. The relay plugs
into the wireless hour meter wire harness. The relay and wireless hour meter
diode are tied to the main wire harness behind the battery. A tag near the wire
harness relay connector or the color of the wires leading to the connector can
be used to identify each relay. All of the relays currently used on the Field Pro
5040 machine have five (5) terminals. The number of terminals the relay has
determines how the relay should be tested.
•
The Start relay supplies power to the starter solenoid. When the key switch is
in the S
position and the appropriate interlocks are in position to start
TART
the engine, the hour meter/controller provides a path to ground (low side
switch) to energize the start relay coil.
•
•
The Charge relay provides a path for the engine alternator to supply the
machine control circuits and to charge the battery once the engine has
started. The charge relay is energized by the key switch when in the R
S
position.
TART
•
The Neutral relay combines the signals from both neutral switches to a single
input for the hour meter/controller. The relay coil is energized when the right
side neutral switch is in the N
switch is in the N
EUTRAL
and on to the hour meter/controller. Using the neutral relay in this manner
ensures that both neutral switches must be in the Neutral position before the
hour meter/controller will allow the engine to start.
•
The optional Wireless Hour Meter relay is used to supply power to the
wireless hour meter from 2 different power sources. Initially, the wireless hour
meter is powered and the relay coil is energized by the starter circuit when
the key switch is in the S
circuit crosses the switched relay contacts to power the wireless hour meter
and keep the relay coil energized when the key switch is released. A diode in
the circuit prevents the 2 different power supplies from colliding. The wireless
hour meter relay is used as a "latching" relay.
Refer to
Figure 72
for this procedure.
1. Park the machine on a level surface, set the key switch to the O
and remove the key from the switch.
2. Disconnect the ground cable at the battery; refer to
the Battery (page
6–29).
3. Lower the operator cushion and locate the relay to be tested.
4. Disconnect the wire harness connector from the relay. Check the relay
and the harness connector for damage or corrosion and clean or repair
if necessary.
Note: Prior to taking small resistance readings with a digital multimeter, short
the meter test leads together. The meter will display a small resistance value
(usually 0.5 ohms or less). This resistance is due to the internal resistance of
the meter and test leads. Subtract this value from the measured value for
the tested component.
5. Using a multimeter, verify that coil resistance between terminals 85 and 86 is
from 71 to 88 ohms.
position. When the left side neutral
EUTRAL
position, power passes through the relay switch
position. Then, power from the fuel solenoid
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Page 6–20
or
UN
position
FF
Removing and Installing
Field Pro® 6040
22267SL Rev A
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Troubleshooting
