5-M5
ZD321, ZD326, ZD331, WSM
ELECTRICAL SYSTEM
[3] 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.
W1013021
[4] SAFETY SWITCH
Switches are located at the motion control levers, at
the parking brake pedal, at the PTO lever and under the
operator’s seat.
Function of switch is to control current from main
switch to relay.
Switches are changed to “CLOSE” or “OPEN”
electrically by changing the motion control levers, or
sitting on the operator’s seat or engaging the parking
brake.
By selecting either normally open or normally closed
contact, the switch function is determined.
W1013337
(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.)
Safety switch Type
Seat switch Normally open
PTO lever switch Normally open
Parking brake switch Normally close
Motion control lever (LH) switch Normally open
Motion control lever (RH) switch Normally open
(1) Parking Brake Switch
(2) Motion Control Lever Switch
(3) Seat Switch
(4) PTO Lever Switch
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