Inhoudsopgave
Advertenties
ELECTRICAL SYSTEM
SECTION 6
B-SERIES
I gnition System
Magneto ignition is used in the
B-Series.
The ignition
switch is used to ground the magneto to stop the engine,
and to engage the starter.
The ignition switch continuity test is performed as fol-
lows with the switch totally disconnected:
Position
OFF
RUN
START
Terminals
M & switch case
B&R&A
B&S
Continuity between these terminals in the positions
shown indicates a good switch.
Do not interchange B-Series with C and D-Series igni-
tion switches even though they look identical.
Charging System
The B-Series is equipped with a dual circuit alternator.
One circuit provides 12 volts AC (alternating current) to
power the lights. The lights will NOT operate without the
engine running (lights optional on
B-81).
The second circuit provides charging current (12 volts
DC) to the battery.
Never interconnect the AC light circuit and the DC
battery circuit as charging system may be seriously
damaged.
The DC output for charging the battery is obtained
through use of a diode. If the battery does not recharge,
check the diode. The diode is contained in a fuse capsule
near the
starter.
If the engine must be operated with the battery dis-
connected from the charging system, always dis-
connect the DC output lead at the fuse capsule, to
avoid possible charging system damage.
Fig.6-1 B-Series DC Output Diode and AC Output Lead
6-1
The alternator charging system normally requires no ser-
vice other than periodically checking that all exposed wiring
and electrical connections on the tractor are clean, tight,
and
in
good condition.
Proper polarity is critical with an alternator equipped
charging system.
Always disconnect the battery
ground cable (negative) before working on any part of
the electrical system. Verify all components are con-
nected correctly before reconnecting the ground
cable (negative).
I nterlock Switches
The B-Series interlock system incorporates two switches,
one operated by the foot pedal, and one operated by the
PTO clutch lever. If the starter fails to operate, check the
position of the switches in relation to their respective oper-
ating levers.
Be sure the switches are actuated when the
PTO clutch lever is in the disengaged position, and when
the foot pedal is depressed. Both interlock switches must
be closed to start the engine.
Fig. 6-2 B-Series PTO Interlock Switch
Fig. 6-3 B-Series Foot Pedal I nterlock Switch
Advertenties
Inhoudsopgave
