Komatsu Galeo PC138US-8 Shop Manual page 273

10 Structure, function and maintenance standard
Function
Raises the engine speed automatically to warm up the engine if the coolant temperature is low after
q
start-up of the engine.
Operational conditions (all required)
Coolant temperature: Max. 30°C
Fuel control dial: Max. 70% of full rotation
Release conditions (either one required)
Coolant temperature: Min. 30°C
Automatic
Duration of automatic warming-up: Min. 10 minutes
Fuel control dial: Held at Min. 70% of full rotation for Min. 3 sec-
Manual
onds
Overheat prevention function
a See "Engine automatic warm-up function" for system circuit diagram.
Prevents overheat to protect the engine by reducing load on the pump if the coolant or hydraulic oil tem-
q
perature becomes too high.
Operational conditions
Working mode: P, ATT
Coolant temperature: Min. 95°C
Hydraulic oil temperature: Min. 95°C
Traveling status check: OFF
Operational conditions
Working mode: P, ATT
Coolant temperature: Min. 98°C
Hydraulic oil temperature: Min. 98°C
Traveling status check: ON
Operational conditions
Working mode: P, ATT
Coolant temperature: Min. 100°C
Hydraulic oil temperature: Min. 100°C
Traveling status check: Any
Operational conditions
Working mode: P, ATT, E, B
Coolant temperature: Min. 102°C
Hydraulic oil temperature: Min. 102°C
Traveling status check: Any
Operational conditions
Working mode: Any
Coolant temperature: Min. 105°C
Hydraulic oil temperature: Min. 105°C
Traveling status check: Any
PC138US, USLC-8
O
Operation and actions taken
Engine speed: Remains same
o
• Sends torque control signal to
lower the pump absorption torque
and reduce the engine load.
Operation and actions taken
o
• Engine speed: Remains same
• Travel speed: Down
Operation and actions taken
Engine speed: Remains same
o
• Sends torque control signal to
lower the pump absorption torque
and reduce the engine load.
Operation and actions taken
Engine speed: Re
mains same
Alarm monitor: ON
o
•
Sends torque control signal to
lower the pump absorption torque
the engine load.
and reduce
Operation and actions taken
Engine speed: Low idle
o
Alarm monitor: ON
Alarm monitor: Sounds
Operation
o
Engine speed: 1,300 rpm
Release
o
Engine speed: Any
Release conditions
Coolant temperature: Max. 95°C
Hydraulic oil temperature: Max. 95°C
o
• The original conditions are restored if
above requirements are met (auto-
matic restoration).
Release conditions
Coolant temperature: Max. 98°C
Hydraulic oil temperature: Max. 98°C
o
• The original conditions are restored if
above requirements are met (auto-
matic restoration).
Release conditions
C
oolant temperature: Max. 100°C
Hydraulic oil temperature: Max. 100°C
o
• The original conditions are restored if
above requirements are met (auto-
matic restoration).
Release conditions
Coolant temperature: Max. 102°C
Hydraulic oil temperature: Max. 102°C
o
• The original conditions are restored if
above requirements are met (auto-
matic restoration).
Release conditions
Coolant te
mperature: Max. 105°C
Hydraulic oil temperature: Max. 105°C
Fuel control dial: Returns to low idle
o
(MIN) position.
•
The original conditions are restored if
quirements are met (man-
above re
ual restoration).
SEN02553-01
15