wsm STW37 Workshop Manual page 424

STW34, STW37, STW40, WSM
(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.
Main Switch Glow Relay
OFF OFF
ON ON
START ON
(1) Battery
(2) Main Switch
(3) Glow Lamp
(4) Glow Relay
(5) Glow Controller
(6) Glow Plug
(7) Coolant Temperature Sensor
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.
Coolant Temperature
−25 °C (−13 °F)
0 °C (−32 °F)
60 °C (140 °F)
(1) QGS Controller
9-M7
ELECTRICAL SYSTEM
Glow Lamp Glow Plug
OFF OFF
ON ON
ON ON
(a) "OFF" Position
(b) "ON" Position
(c) "START" Position
9Y1211109ELM0018US0
Energizing Time
4.8 to 7.2 second
2.8 to 4.2 second
1.4 to 2.2 second
(2) Coolant Temperature Sensor
9Y1211109ELM0022US0
KiSC issued 11, 2014 A