3408E and 3412E Engines for Caterpillar Built Machines Coolant Flow Switch Caterpillar


Coolant Flow Switch
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3408E and 3412E Engines for Caterpillar Built Machines [SENR1017]
ELECTRICAL AND STARTING SYSTEM
SWITCH GP
3408E and 3412E Engines for Caterpillar Built Machines Coolant Flow Switch


Illustration 1g03136217
Typical example

Table 1
Specification for 171-8708 Flow Switch, 171-8709 Flow Switch, 171-8710 Flow Switch Gp, and 171-8711 Flow Switch Gp 
Item  Qty  Part  Specification Description 
9X-4730 Flow Switch  Test the flow switch with the paddle (3) in the vertical position and apply force on the rivet head (2). 
Actuation force is 0.362 ± 0.029 N (0.081 ± 0.007 lb).
Minimum deactuation force is 0.303 N (0.068 lb).
Contact position is normally open.
When the switch is installed in the engine cooling system, there is not enough force from the flow of coolant at engine cranking speed in order to activate the switch. When the engine is running at low idle, the flow of coolant has enough force in order to activate the switch. 

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