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Old 04-21-2019, 01:57 PM   #1
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Hydraulic Fluid

Hi All,
What brand and weight of oil do you use in the hydraulic system on your DP? On mine it is used for the radiator fan and also steering. My buddy uses AW32 but he says that some people may use transmission fluid or even regular motor oil.
I don't know what I have in mine but I do know it is about a qt low.



I have a Spartan Mountain Master chassis. I can check with Spartan if need be.
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Old 04-21-2019, 02:17 PM   #2
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Call Spartan. Have the last six digits of your VIN. They will help very easily.
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Old 04-22-2019, 05:55 AM   #3
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Spartan replied: If what is in there is red in color, use transmission fluid. If it's light clear brown in color, use AW32 hydraulic fluid.
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Old 04-22-2019, 08:35 AM   #4
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My 2002 Mountain Master chassis with Cummins ISC 350 uses AW32.
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Old 04-22-2019, 11:45 AM   #5
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When I wiped the stick on a white cloth the fluid looked like it had some red but not a lot of red. Then I opened a bottle of ATF and put a little drop on the cloth near the mystery fluid - night and day difference in red - so AW32 it is.
Thanks for everyone's help. It took a full qt to fill it to cold full.
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Old 04-24-2019, 03:40 PM   #6
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My 2018 uses AW46, maybe it changes with different years.
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Old 04-26-2019, 04:10 PM   #7
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Speaking of hydraulic fluid, I'm doing the annual fluid change. I forgot how I did it last year but I do remember the external filter is changed annually along with the fluid. The internal filter is I believed changed every 2 years.


Any suggestions on how to change the fluid. I was going to use an extraction pump and remove as much out of the reservoir as possible and refill. I'll fill the external filter before installing. Does this sound correct?
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Old 04-26-2019, 04:21 PM   #8
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My '02 DSDP on Spartan used AW32 but Spartan ssid I could use AW46 if I drained the old and flushed the system first.
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Old 04-27-2019, 12:02 PM   #9
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Quote:
Originally Posted by timjet View Post
Speaking of hydraulic fluid, I'm doing the annual fluid change. I forgot how I did it last year but I do remember the external filter is changed annually along with the fluid. The internal filter is I believed changed every 2 years.


Any suggestions on how to change the fluid. I was going to use an extraction pump and remove as much out of the reservoir as possible and refill. I'll fill the external filter before installing. Does this sound correct?


Mine has a plug, stick a bucket under it and let it go.
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Old 04-27-2019, 12:44 PM   #10
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Originally Posted by Tha_Rooster View Post
Mine has a plug, stick a bucket under it and let it go.
I found it, thanks.
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Old 04-27-2019, 03:21 PM   #11
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Quote:
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I found it, thanks.


Donít know what system you have but mine also has a filter inside tank and a spin on filter.
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Old 04-27-2019, 06:36 PM   #12
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Mine too but every other year on that filter. I did both last year so good for another year.
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Old 04-27-2019, 08:12 PM   #13
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Draining the reservoir simply does that, it does not drain the extensive hydraulic lines that run to the cooling fan and power steering. Spartan says not to open the system except to change filters, unless there are problems within the system, not even to change hyd oil -unless contaminated, for that reason.
That makes changing to a different weight or type oil impractical and work intensive.
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Old 04-28-2019, 04:48 AM   #14
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Due to the fact that my reservoir is mounted higher than the external spin on filter, it's important to note that when removing the spin on filter it will drain the reservoir. Thus when replacing the filters, make sure the reservoir is empty before removing the spin on filter.

Gravity wins every time. Don't ask how I know!
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