Kubota B1830, Workshop Manual, Page: 420 / 548

ELECTRICAL SYSTEM B1830,B2230,B2530,B3030, WSM
9-M14
[4] GLOW PLUG
This plug is a two-material type QGS (Quick Glow
System) for quick temperature rise, and has
self-controlling function as well as excellent durability.
The heater (4) connected in series to the heater (3),
which also functions as the resistor, is incorporated in
the sheath tube (1) of the super glow plug.
The resistance of this heater (3) cum resistor is small
when the temperature is low, while the resistance
becomes large when the temperature rises.
Therefore, because sufficient current is flown to the
heater (4) during the initial period of energization, the
temperature rises quickly and the resistance grows with
the rise in the temperature of the resistor, the flowing
current is reduces to prevent the heater (4) from being
heated.
The ignition point is in the area of 2 to 3 mm (0.079
to 0.118 in.) from the tip of the plug in order to reduce its
projection into the combustion chamber.
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[5] SAFETY SWITCH
Manual Transmission Model: Shuttle Shift Switch,
PTO ON-OFF Lever Switch
HST Model: PTO Clutch Lever Switch (Independent
PTO Lever Switch), HST Pedal Switch
The safety switch prevents current from flowing to
the starter when the safety switches are not depressed.
This is to ensure safe starting.
The safety switches are located at two (Manual
Transmission Model: Shuttle shift switch, PTO ON-OFF
lever switch
HST Model: PTO clutch lever switch (independent
PTO lever switch), HST Pedal Switch) different
positions.
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(1) Sheath Tube
(2) Insulation Powder
(3) Heater also functioning as a
Resistor
(4) Heater
(5) Super Glow Plug
(6) Conventional Quick-heating
type Glow Plug
(7) Glow Plug Current
(a) Glow Plug Temperature
(°C)
(b) Current (A)
(c) Time (Sec.)
(A) Released (when shifted)
(B) Depressed (when neutral) a: From Main Switch
b: To Starter
KiSC issued 05, 2012 A