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Old 07-20-2018, 05:08 PM   #1
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Hydraulic radiator fan?

Does anyone know if Spartan is still using a hydraulic driven radiator fan on the K2 450. I know my 2008 MM chassis does. Maybe this is a advantage over Freightliner.
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Old 07-20-2018, 05:22 PM   #2
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Our 2017 DS 4369 has it. Why do you ask?
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Old 07-20-2018, 10:51 PM   #3
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I was looking at a new Entegra Aspire 40P and couldn't tell. I have it narrowed down to that or a Dutchstar 3736 on a Freightliner. I also looked at Allegro Bus on the Powerglide, but read about complaints of belt squeal when the fan kicked on high. I think maybe the later two are belt drive. It seems to me that hydraulic fan drive would be superior and not rob horsepower.
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Old 07-21-2018, 10:01 AM   #4
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Originally Posted by TUCSONRAIL View Post
It seems to me that hydraulic fan drive would be superior and not rob horsepower.
That is exactly what my highly experienced diesel mechanic told me just a couple of weeks ago when he replaced the leaking "hydrostatic fan motor" ... doesn't rob the horsepower that a belt driven fan does.
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Old 07-21-2018, 04:50 PM   #5
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That is exactly what my highly experienced diesel mechanic told me just a couple of weeks ago when he replaced the leaking "hydrostatic fan motor" ... doesn't rob the horsepower that a belt driven fan does.
Hold on a moment. The hydraulic fan uses the energy in hydraulic pressure/flow in order to run. That energy comes from the hydraulic pump which is driven by the engine, which uses, you guessed it, horsepower. Remember, there is no free ride!
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Old 07-21-2018, 05:14 PM   #6
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Hold on a moment. The hydraulic fan uses the energy in hydraulic pressure/flow in order to run. That energy comes from the hydraulic pump which is driven by the engine, which uses, you guessed it, horsepower. Remember, there is no free ride!
OK, so given that, which is the biggest robber?
I like my hyd. so far, with the clean look and absent of another pulley and belt drive.
Also two speed and runs pretty silent, at that. In fact, I've never heard the fan running and maybe because I have a Clatterpillar to begin with.
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Old 07-21-2018, 05:32 PM   #7
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There is a chart in this pdf , that gives info on the horsepower demands of a hydraulic driven fan , unfortunately , there is no similar chart for a belt driven cooling fan.
Because the 3126B and C-7 Cat engines were installed in chassis with both side and rear rad configurations , there was a need for the comparison.
All I know is that when the hydraulic fan goes to full song; in my coach ; on a hill I feel it in the throttle. Chart says up to 70 HP.
On a trip when the rad fan control module failed , I was down 1.5mpg.

There is a similar pdf , produced by Cummins , but I don't have a copy.
Attached Files
File Type: pdf Cat_RV_Performance.pdf (246.3 KB, 11 views)
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Old 07-22-2018, 10:37 AM   #8
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There is a chart in this pdf , that gives info on the horsepower demands of a hydraulic driven fan , unfortunately , there is no similar chart for a belt driven cooling fan.
Because the 3126B and C-7 Cat engines were installed in chassis with both side and rear rad configurations , there was a need for the comparison.
All I know is that when the hydraulic fan goes to full song; in my coach ; on a hill I feel it in the throttle. Chart says up to 70 HP.
On a trip when the rad fan control module failed , I was down 1.5mpg.

There is a similar pdf , produced by Cummins , but I don't have a copy.
Didn't know that FL even had a hyd. fan. Again, I wouldn't know mine was even running, but maybe it never does go into full song as you say and it will increase in temp, a bit when climbing.
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Old 07-22-2018, 10:50 AM   #9
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Didn't know that FL even had a hyd. fan. Again, I wouldn't know mine was even running, but maybe it never does go into full song as you say and it will increase in temp, a bit when climbing.
I can't say if the side rad was a Newmar , requirement on the Freightliner chassis they ordered, but I can say for sure that there are major differences in the chassis wiring , between Newmar and National , Freightliner XC chassis of the same year. The Freightliner manual with my coach , was no help when it came to fuses etc. because it has only the National chassis fuse box diagram.
The chassis fuse box covers on my coach even have the chassis serial numbers on them .
Newer chassis , may have a variable , hydraulic rad fan control, where my vintage coach has three; off ( cold start) low ( normal operating temp) and LOUD,( when engine temps climb above normal).
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Old 07-22-2018, 04:40 PM   #10
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With Spartan chassis in a Newmar coach if it's a ISC or ISL they are hydraulic driven engine fans. 500HP and up are belt driven fans which both our Essex with a 500 ISM and our 18 London Aire with X15 have.
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