ELECTRICAL SYSTEM
STW34, STW37, STW40, WSM
9-M7
(1) Glow Control System
STW34, 37 and 40 Cabin Model Tractor are
equipped quick glow system (QGS) to control energizing
time to the glow plugs (6) by means of coolant
temperature of the engine.
This system makes it easy for the operator to start
the engine even when it is in cold season, because
starting preparation can be completed if it is confirmed
that the glow lamp (3) is turned off. This system consists
of main switch, glow lamp, glow relay, glow controller,
coolant temperature sensor and glow plug.
9Y1211109ELM0018US0
QGS Controller
When the main switch is turned on, the QGS
controller (1) detects the coolant temperature by means
of the coolant temperature sensor (2), and controls the
energizing time to the glow plugs and glow lamp
according to the detected coolant temperature.
The relation between the coolant temperature and
the energizing time is as shown in the table.
9Y1211109ELM0022US0
Main Switch Glow Relay Glow Lamp Glow Plug
OFF OFF OFF OFF
ON ON ON ON
START ON ON ON
(1) Battery
(2) Main Switch
(3) Glow Lamp
(4) Glow Relay
(5) Glow Controller
(6) Glow Plug
(7) Coolant Temperature Sensor
(a) "OFF" Position
(b) "ON" Position
(c) "START" Position
Coolant Temperature Energizing Time
−25 °C (−13 °F) 4.8 to 7.2 second
0 °C (−32 °F) 2.8 to 4.2 second
60 °C (140 °F) 1.4 to 2.2 second
(1) QGS Controller (2) Coolant Temperature Sensor
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