Komatsu PC88MR-10 Shop Manual page 261

Function
When the coolant temperature is low after the engine is started, the engine speed is increased
automatically to warm up the engine.
The engine automatic warm-up function has 2 kinds; "Heater warm-up" and "Normal warm-up", either of
which is used according to the purpose.
The purpose of the heater warm-up is to increase the coolant temperature to improve the effect of the
heat.
The purpose of the normal warm-up is to heat the engine to prevent damage on the engine caused by low
temperature.
Machine specification: Air conditioner specification
Air conditioner: Blower "ON"
Coolant temperature: Below 65ºC
Ambient temperature: Max. 5ºC
When any of operating conditions 1 is not satisfied
Heater warm-up is disabled (normal warm-up)
Operating conditions 2
(Operates when all of the following conditions are
satisfied)
Coolant temperature: Below 30ºC
Engine speed: Max. 1,300 rpm
Operation
Engine speed: 1,300 rpm
Canceling conditions
(Canceled when any of the following conditions is
satisfied)
Coolant temperature: Min. 30
Automat-
Warm-up operation time: Min. 10
ic
minutes
Fuel control dial: Held at 70% of high idle
Manual
(Max.) for 3 seconds.
Engine speed: Any
PC88MR-10
Operating conditions 1
O
O
O
O
Canceled
10 Structure and function
When all of operating conditions 1 are satisfied
Heater warm is enabled
Operation
Engine speed: Min. 1,300 rpm
Canceling conditions
(Canceled when any of the following conditions is
satisfied)
Coolant temperature: Min. 65°C
Ambient temperature: Min. 10°C
Electrical control system
O
O
O
O
O
O
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