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Cooling Fan Speed Adjustment Guide

The document provides instructions for adjusting the cooling fan speed on trucks. It lists the required equipment and describes the steps to heat the truck, check the current to the solenoid valve, and measure the fan speed at idle and maximum engine speeds using an infrared speed tester. It notes the minimum required fan speeds and explains that the proportional valve adjuster screw can be turned clockwise to increase fan speed or counterclockwise to reduce it, until the minimum required maximum speed is reached.

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Munawar Doank
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95 views1 page

Cooling Fan Speed Adjustment Guide

The document provides instructions for adjusting the cooling fan speed on trucks. It lists the required equipment and describes the steps to heat the truck, check the current to the solenoid valve, and measure the fan speed at idle and maximum engine speeds using an infrared speed tester. It notes the minimum required fan speeds and explains that the proportional valve adjuster screw can be turned clockwise to increase fan speed or counterclockwise to reduce it, until the minimum required maximum speed is reached.

Uploaded by

Munawar Doank
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Service Training

Cooling Fan Speed adjustment


Equipment required
Lap Top with Pathfinder and 359 Service Base
Infrared Speed Tester
Hand Tool kit

a) Make sure that if the truck has a travel speed limit that this speed limit is adjusted by
the swash angle and not by the limitation of engine speed !
Engine Speed :
Low Idle = 800
High Idle 2100
b) Heat the truck up , water temp should be above 92 , current to Solenoid valve
cooling fan 800 Milli Amp ( use pathfinder to get this information )
c) Check the fan speed with the proportional valve connected
Note : special care is necessary because of the rotating fan blades
Engine Idle speed , fan at least 650 -700 Rpm ( T2 & T3 )
Engine max speed , fan speed at least 1800 Rpm on T2 and 2000 on T3
TIP : On T3 trucks the oil motor displacement is 27 cc on T2 32 cc . The new oilmotor
can fit also into T2 trucks
If the speeds are lower please adjust carefully /slowly the proportional valve until
you reach the minimum required max speed !
Adjuster CW = increasing the speed , Adjuster CCW reducing the fan speed

Adjuster screw

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