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Page 345 of my 2002 Endeavor Owners Manual -

"The power steering reservoir with internal filter is located in rear engine compartment. The hydraulic filter assembly is located inside the reservoir. It is rated at ten micron*. The reservoir is filled with Dexron III Automatic Transmission Fluid from the factory.
Filter assembly: Nelson 910048A
Element number: 83213D (ten micron)

The primary function of the power steering reservoir is to keep the steering system free of contamination and to dissipate excessive heat that builds during extreme operating conditions.
Check the oil level in the reservoir every 6,000 miles or three months. The oil dipstick fill is located on top of the reservoir in the rear compartment. The oil level should be kept between the full and add marks on the dipstick. If adding fluid is required, use only Dexron III Automatic Transmission Fluid.
"

- bob

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Gary, problem was that all the coaches did not have the same fluid, the red color was Dextron, straw was AW46 Hydraulic fluid, brown was engine oil,40W if I remember right. The correct fluid question was asked quite often back in your coach age group.

Bill B 07 Dynasty

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I was replying to the 02 Endeavor owner's manual post. My 05 AMB was the first year on the Roadmaster 8 airbag chassis which was carried over from 04 Endeavor.  My owner's manual says I have a coolant filter but it was eliminated by the EPA. Holiday Rambler never changed that in the carryover of the 04 owner's manual. No telling how far back that owner's manual goes.

Gary 05 AMB DST

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  • 3 months later...

Reviving this post... my owners manual also identifies a Filter assembly Nelson 91085G AND a Filter number 84365A.  Servicing recommended annually or every 15,000 miles.  I've owned the beast for 5,000.  It has 75,000 miles in it.  There is no indication it's ever been changed (specified 15W-40 or the filter).  Is the "Filter assembly" the housing?  Or are there multiple filters in the black cylinder, as I have noted in other threads?  

When doing the change, is it best to pump out the chamber, fish out all the filters (assuming there are multiple ones) and then change the filters and refill the housing??  How do I get all the oil out of the hydraulic power steering system?  Does this involve disconnecting lines from the power steering pump (which I would need to locate)?

Thanks in advance for the help! 

And by the way, every system, with exception of the transmission, is also getting serviced... 

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Steve,

I never got into the hydraulic system until I had the Sheppard Steering box changed out for the TRW. I figured it was a good time to change the filters. I purchased the filters and took them to Josam's who was doing the work. They changed the filters and top off the fluid which was red ATF. The old filters look just like the brand new ones. I did all of this back in June of 2017 at 75K clicks on the ODO.

Personally, unless you are opening up the hydraulic system or are having problems with repairs or failures within the system then the 15K/Annual service is overkill.

Fluid level gets checked yearly when engine service is done.

JMHO

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On 6/15/2021 at 9:49 AM, Dr4Film said:

Mike,

It is a HUGE and black. You can't miss it!

Photo attached of mine which is on the right as you are looking at the engine.

ISC-350 Engine-02 .JPG

do you have the part number for the filters that go in the reservoir, i believe there are 3.

thanks, ken 

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My hydraulic filter part numbers were buried in the text in the owner's manual, in a chapter titled Chassis Information, right after the section on the Fuel System, and the heading was Hydraulic System .   They were not in the tables with specs and filter numbers near the end.  Not sure why.  Do you have an owner's manual? 

Edited by Steve P
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19 hours ago, lusgi said:

do you have the part number for the filters that go in the reservoir, i believe there are 3.

Nelson 8410B

I bought them from Ryder Fleet Products  but they closed up shop now. You will have to spend some time on the Internet to find another source.

Edited by Dr4Film
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On 6/15/2021 at 10:04 AM, John Haggard said:

The system should be flushed and changed at least every 5 years

Guess I’m 16 years later on changing the fluid...will be 17 next year.I did the filters probably 8 years ago on the 04 Dynasty and I do check the level, look at, and smell the oil on the stick occasionally.

Edited by Ivylog
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17 minutes ago, cbr046 said:

I just bought a boat load of Donaldson filters from Diesel Equip Inc. 

https://www.dieselequipmentinc.com/

I can't comment on quickness (new customer, just placed the order) but quite the savings over Amazon.

They have a pretty good cross-reference system, too. 

- bob

Thanks Bob.   They have the 84365A, but not the 91085G.  Headed for NAPA on my errands this morning...

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10 hours ago, lake49068 said:

Just purchased NAPA 1487...they did the crossover so should be easy to get.  Not sure how difficult it is to change, I just provide all filters to my servicing garage so there is no confusion or delays.

Adam

Adam, is your MH built by Navistar? I see that they bought Monaco in 2009.

Gary 05 AMB DST

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NAPA cross-referenced my 84365A to their 1487 Gold.  They concluded the 91085G was the housing.   So I bought a 1487.  As soon as I got home, something tells me there are going to be 2 or 3 of those in the housing from re-reading this thread.  I'll buy two more to be sure.  I'll pump or siphon as much oil out of the system as I can, but I don't think I'm going to tempt fate to start leaks by disconnecting any lines.  I'll just check the oil level after letting the engine run and cranking the wheel back and forth... that should work, right? 

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The lines on the bottom of my tank were all the 37 degree flared hydraulic type.  These types of lines only required a decent amount of tightening and they will not leak. 

Large equipment use the same type of fitting and run pressures in excess of 3500 psi.  Once the fittings are tightened there is little chance of a leak.  They are used in the most harshest of environments (logging, mining, construction) and are proven. 

Don't be afraid of taking a fitting loose.  The real only concern would be contamination into the system, make sure to plug or cap any loose lines. 

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15 hours ago, jacwjames said:

The lines on the bottom of my tank were all the 37 degree flared hydraulic type.  These types of lines only required a decent amount of tightening and they will not leak. 

Large equipment use the same type of fitting and run pressures in excess of 3500 psi.  Once the fittings are tightened there is little chance of a leak.  They are used in the most harshest of environments (logging, mining, construction) and are proven. 

Don't be afraid of taking a fitting loose.  The real only concern would be contamination into the system, make sure to plug or cap any loose lines. 

Those are great insights, especially for a newbie like me.   Thanks VERY much!!

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  • 6 months later...

2004 MH, 46,000 miles and no records of the PS and Cooling Fan (side radiator) ATF and filters having been changed. Tall Nelson tank with 3 stacked filters. we are getting ready for a 5,000 mile trip in June and July. Changed the Allison a couple of weeks ago with 19 quarts of TranSynd and kept a sample of the oil. There is good info in some of the older posts on changing oil so will not do a step by step.  I did use 3/8" poly clear hose to siphon out the liquid. Slow but cleaner than removing one of the hoses in the bottom. 

Tracing hoses, the large pump suction on my tank is outside of the filter. The cooling fan large return hose is on the inside of the filters. I siphoned the fluid and added back in 2 gallons of new. Started up the engine and ran for about 4 minutes. the two gallons was enough that the pump did not suck air. There was a small return line that was plumped into the bottom of the tank outside of the filter, a lot of flow, enough to push up above the oil surface. Size wise it is probably the PS pump return. I siphoned empty and no residue or particles in the bottom of the tank. replaced filters with NAPA gold. The rubber washer on one end was small and would barely fit over the angle iron center column of the tank. I pulled the small washer and used the larger washer of the filter above to seal. Refilled with 12 quarts of ATF.  Compared this ATF to the Allison and both have the same dark red color. 

Over the years, I have seen people pull filters apart to see what is inside. I peeled one end cap off, used a chisel to cut through the almost rubbery compound used to lock in the filter material, and cut the media loose on the other end thru the other hole. The inside of the filter had very little fine particles in the media. in the 1/3 of the media I unrolled to review, there were less than 20 particles that could be seen by the naked eye. I would guess that the particles came from the original assembly of the system. I meant to check the particles with a magnet. I will over the next few days. My manual recommends changing filters on like a yearly basis. With what I have seen, I would not be concerned going "several" years between filter changes. If you went to the trouble of pulling apart and looking for debris every few years, it might give you an indication of coming issues. I am considering doing another change of fluid only when we get back from the trip to maybe have 70% of the ATF being relatively new.

HRS PS filter 49.JPG

HRS PS filter 51.JPG

HRS PS filter 52.JPG

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