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Old 06-17-2021, 05:30 PM   #1
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Side radiator fan speed

I have a 2005 dutchstar with a C7 cat 16,000 miles, noticed other day it was running about 203 degrees with air temp upper 80's on the freeway. Seems like the fan wasn't cranking very fast. With zero volts fan should be screaming which would be with solenoid valve unplugged. I measured volts at startup 12.8v, Then measured rpm's today at idle with engine running cold motor fans spins a 360 rpms with connector unplugged goes up to @525-540 rpms as measured with reflecctive tachometer....thinking valve issues? Hydraulic oil is full and clean no burnt smell....I have replaced thermostatrs (regulators) last fall, I have heard that fan on High should sound impressive...... thoughts?
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Old 06-17-2021, 06:54 PM   #2
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Quote:
Originally Posted by pking1793 View Post
I have a 2005 dutchstar with a C7 cat 16,000 miles, noticed other day it was running about 203 degrees with air temp upper 80's on the freeway. Seems like the fan wasn't cranking very fast. With zero volts fan should be screaming which would be with solenoid valve unplugged. I measured volts at startup 12.8v, Then measured rpm's today at idle with engine running cold motor fans spins a 360 rpms with connector unplugged goes up to @525-540 rpms as measured with reflecctive tachometer....thinking valve issues? Hydraulic oil is full and clean no burnt smell....I have replaced thermostatrs (regulators) last fall, I have heard that fan on High should sound impressive...... thoughts?
Just guessing, but you may have a fan control system that uses a solenoid as you described, and a wax valve that also increases fan speed when coolant temp rises. If so, max speed will not happen until coolant has heated, melting the wax.
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Old 06-17-2021, 09:46 PM   #3
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Did you take both measurements ( fan RPM ) with engine at idle ?

Have you tried the measurement with someone raising RPM to 1750 ? That's my cruising RPM.

My fan doesn't get really noisy till 2000+ on a hard climb and I can feel the power loss and 3/4MPH speed drop.

Have you ever changed the hydraulic filters?
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Old 06-18-2021, 05:58 PM   #4
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I just spoke with Spartan and he suggested using cruise control just adjust engine rpm, I will try that on Saturday, What got me on this i got a bluefire adapter an now i am able to see actual coolant temps which are about 203-205' degees on the freeway on flat ground..beginning ti suspect a radiator cleaning will be next if fan check out, oh by the wat spartan says 750 rpm is max...does this sound right?
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Old 06-20-2021, 11:32 AM   #5
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I just spoke with Spartan and he suggested using cruise control just adjust engine rpm, I will try that on Saturday, What got me on this i got a bluefire adapter an now i am able to see actual coolant temps which are about 203-205' degrees on the freeway on flat ground..beginning to suspect a radiator cleaning will be next if fan check out, oh by the way spartan says 750 rpm is max...does this sound right?
Rad fan speed should increase with hydraulic pump speed .
I can't say if Freightliner ever gave a rad fan motor RPM spec .
But , then I'd always assumed for some reason that Spartan chassis were equipped with Cummins engines , so I guess I'd better strike that assumption off the list.
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Old 06-20-2021, 11:38 AM   #6
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The other pretty easy/basically routine maintenance items is the hydraulic system filters.


When were they last replaced?


Certainly restricted flow to pump could result in low PSI to the fan motor.


Even if this is not the issue, this is just basic DP maintenance.
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Old 06-20-2021, 11:59 AM   #7
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Quote:
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With zero volts fan should be screaming which would be with solenoid valve unplugged. I measured volts at startup 12.8v, Then measured rpm's today at idle with engine running cold motor fans spins a 360 rpms with connector unplugged goes up to @525-540 rpms as measured with reflective tachometer....thinking valve issues.

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. . . oh by the way spartan says 750 rpm is max...does this sound right?
If 750 rpm is the max per Spartan, then as you run the engine up (someone else in the seat) with the valve unplugged you should see the fan top out there. As fan speed goes up, pressure to the fan motor necessarily goes up, and that’s probably how speed is limited, i.e. via a pressure relief or pressure limiting valve. And I believe the solenoid valve is actually just that, and the solenoid simply changes the set point for pressure.

Wax valves work the same way, though they’re infinitely variable between the two set pressures while the solenoid valve is probably just one or the other.
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Old 07-01-2021, 08:38 PM   #8
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Guys, had coach out this weekend, temp runs up to about 203 degrees, have since posting, changed his. Filters both in tank and spin on and replaced oil. Also with side radiator they appear to be stacked with radiator on bottom , AC condenser in middle and CAC on top, only laminated is with trans cooler and CAC. Spent 2 hrs cleaning with AC condenser foam and power washer, water was flowing thru with no kick back in stream. Could it be that 203-205 is where she likes to run?
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