Domestic Compact Electrical Systems
2.19. The fuel tank sender unit also lives under the
fender, on the left hand side. It is basically a
potentiometer actuated by a float. It creates
more or less resistance between the white wire
leading to pin #7 on the instrument panel and a
ground circuit.
Figure 2.19
2.20. The seat switch contains a set of normally open
contacts. When the seat is occupied, power is
sent to the PTO relay windings. When the seat
is empty, the PTO relay is de-energized, braking
the contact that provides power to the PTO. We
never want the PTO running with the seat
empty. See Figure 2.20.
Figure 2.20
K&T Saw Shop 606-678-9623 or 606-561-4983
www.mymowerparts.com
See Figure 2.19.
79
2.21. The reverse switches differ between the Series
5000 tractor and the other domestic compact
tractors. See Figure 2.21.
Figure 2.21
•
The series 5000 reverse switch is located on the
right hand side frame channel, just in front of the
pedal linkage.
•
There are two sets of contacts in the switch, but
only one is used: normally closed.
•
When the plunger is depressed (in reverse), the
contacts connecting the red wire with black trace
(power) and the orange wire with black trace (pin
# 9 on the instrument panel) are broken.
•
When the instrument panel sees no power signal
from the reverse switch and sees no ground sig-
nal from the reverse over-ride, it breaks the
ground path for the windings on the PTO relay
(pin # 6). This de-energizes the relay, breaking
the contacts that provide power to the PTO
clutch.