Relays
Six (6) relays are used on the ProCore 648. Four (4) of
these relays are attached under the control panel next
to the battery (Fig. 13): lockout relay, clutch relay, neutral
switch (start) relay and lockout latch relay. The remain•
ing two (2) relays are attached under the handle console
(Fig. 14): neutral switch (latch) relay and latching relay.
The six relays are identical. The relays are identified by
a tag on the wire harness relay connector.
1
2
See the Circuit Operation section of this Chapter for in•
formation on relay operation.
Testing
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
Figure 13
1.
Battery
2.
Relay location
0.5
ohms or less). This resistance is due to the internal
2
resistance of the meter and test leads. Subtract this val•
ue from the measured value of the component you are
testing.
1.
Locate relay to be tested. Disconnect the machine
wire harness connector from the relay.
2.
Using a multimeter (ohms setting), measure coil re•
sistance between terminals 85 and 86 (Fig. 15). Resist•
ance should be between 70 and 90 ohms.
3.
Connect multimeter (ohms setting) leads to relay ter•
1
minals 30 and 87. Ground terminal 86 and apply +12
VDC to terminal 85. The relay should make and break
continuity between terminals 30 and 87 as +12 VDC is
applied and removed from terminal 85.
Figure 14
1.
Traction lever
2.
Relay
4.
Disconnect voltage from terminal 85 and multimeter
lead from terminal 87.
5.
Connect multimeter (ohms setting) leads to relay ter•
minals 30 and 87A. Apply +12 VDC to terminal 85. The
relay should make and break continuity between termi•
nals 30 and 87A as +12 VDC is applied and removed
from terminal 85.
86
87A
87
6.
relay terminals. Reconnect relay to machine wire har•
ness.
Disconnect voltage and multimeter leads from the
85
30
Figure 15
ProCore 648
Electrical System
Page 5 – 15
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