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Old 06-26-2019
jcs707's Avatar
jcs707 jcs707 is offline
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Default 95 WB-42 S60 Hydraulics overview

I've loaded a version of this diagram in various threads in the past, thought it made sense to create a separate thread to help with future searches.











Theory of Operation:

The big radiator fan is driven by hydraulic fluid which the PTO driven pump provides. Thus, the PTO and pump are key components to maintain.

The speed of the fan is regulated or controlled by a couple of sensors and switches. These sensors and switches change the speed of the fan by decreasing the flow of hydraulic fluid through the 'pilot circuit'. Under a cold motor situation the pilot circuit has unrestricted flow. In a hot motor situation the pilot circuit has restricted flow - variable or full - depending on which sensor or if a switch was activated.

Restricted flow in the pilot circuit creates back-pressure on the fan motor control valve. When this happens, the amount of hydraulic fluid that is by-passing the fan motor is reduced - which means more fluid is driving the fan motor - which means the fan speed increases.

The thermovalve creates a variable restriction in pilot circuit flow based on temperature in the upper radiator pipe - which means variable fan speed. Again, cold motor - low restriction, hot motor - high or full restriction.

The kysor temp sensor is an on/off control - which measure charge air temperature. When the limit is reached it will electrically signal the pilot circuit solenoid valve to shut completely - which puts the fan in high mode.

The fan override and dash A/C (and turning on the defroster) immediately signal pilot circuit solenoid valve to shut completely - which puts the fan in high mode.
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2000 LXI SS (Piper)
1977 FC 31 RB (Busta)
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Last edited by jcs707; 06-27-2019 at 01:24 PM.
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Old 06-26-2019
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Thanks Clint,good stuff.
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Old 06-27-2019
Flyfisher Flyfisher is offline
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Very nice work Clint, the WOG 95/96 WB S60 DDEC III owners are fortunate to have you in their group!
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Old 06-27-2019
markkitch markkitch is offline
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Well done Clint, team WB 95/96 thank you. Just awesome.

I can't recall if I posted it, but back in the spring I replaced the two fans on my hydraulic cooler. The old Hayden fans were working but had slowed significantly. I purchased two 12" Derale fans from www.etrailer.com they bolted right in place (no modification required). It literally took 20 minutes. The benefit was much much higher airflow at a lower current draw. Purchase was over $100 so free shipping no sales tax.

D18912 Derale 12" Dyno-Cool Curved-Blade Electric Fan - 810 CFM
2 for $101.28
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Old 06-27-2019
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Randy Dupree Randy Dupree is offline
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Quote:
Originally Posted by markkitch View Post
Well done Clint, team WB 95/96 thank you. Just awesome.

I can't recall if I posted it, but back in the spring I replaced the two fans on my hydraulic cooler. The old Hayden fans were working but had slowed significantly. I purchased two 12" Derale fans from www.etrailer.com they bolted right in place (no modification required). It literally took 20 minutes. The benefit was much much higher airflow at a lower current draw. Purchase was over $100 so free shipping no sales tax.

D18912 Derale 12" Dyno-Cool Curved-Blade Electric Fan - 810 CFM
2 for $101.28

The fan motors your speaking of don't get much use,so the bushings get dry,i drill a tiny hole on the back side of the motor by the bushing and drip some 3-in-1 oil in on the bushing,works everytime.
Just sayin...
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Old 06-27-2019
markkitch markkitch is offline
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good advice, thanks Randy. Much easier. I have a drill bit and some oil.
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Old 08-06-2019
Butch Charpentier Butch Charpentier is offline
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Does someone have a similar diagram for a 92 WB with an 8V92?
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