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barmcd · 10-05-2021, 09:57 AM

The coach has been sitting, waiting for me to finish this project. I called HWH on August 30th to order new hoses and they put me on a call back list. They finally called me back yesterday, October 4th. I ordered all 6 hoses for the system and hope they deliver them a quicker than it took them to take my order. They were actually quite reasonable compared to NAPA or my local hydraulic repair shop.

49439 - $49.89
53965 - $43.54
5924 - $56.60

That last part number is for a hose 6" longer than the original because they don't have a price in their system for the original length hose.

barmcd · 10-15-2021, 01:44 PM

At long last, new hoses. They look different than the original which looked like rubber. These look like some type of hard plastic. Maybe they just have some type of shiny coating on them?

I’ll get started replacing them on Sunday.

zmotorsports · 10-15-2021, 01:53 PM

Good luck on the hose replacement project. They're not too awfully bad unless you run across a zip-tie that was installed in a nearly inaccessible location like on our 2003 Dynasty. Once the new hose installation was complete I disconnected the rams from the slide rooms and cycled several times to ensure all of the air was bled from the synchronizing cylinders. Not sure if that was necessary or not but it was easy enough to do and gave me piece of mind before running the slide in and out.

Rocketman3 · 10-17-2021, 12:24 AM

Quick question- I need to do this project on my 2000 Dynasty 36’. One of our complication is we live in it full- time.

Once we pull the rams out of the rig, can we move the slide by hand (to push it back in and out) and move the rig around the property? (Parking is a different place than working on it).

When the rams are removed is there something else that will keep the slide from coming all the way out (falling out of the rig).

Thanks for your great writeup!!! It almost makes me think I might be able to do this project.

barmcd · 10-17-2021, 12:36 PM

Quote:

Originally Posted by Rocketman3

Quick question- I need to do this project on my 2000 Dynasty 36’. One of our complication is we live in it full- time.

Once we pull the rams out of the rig, can we move the slide by hand (to push it back in and out) and move the rig around the property? (Parking is a different place than working on it).

When the rams are removed is there something else that will keep the slide from coming all the way out (falling out of the rig).

Thanks for your great writeup!!! It almost makes me think I might be able to do this project.

I’m not sure what you are talking about, but I think the answer might be no in either case. I call the square tubes the slide moves on the rams. You have to support the slide room with a fork lift or cribbing if you are going to remove those. If you’re referring to the hydraulic cylinders, they are the only thing holding the slide in when it’s retracted. Theoretically, you should be able to use the slide room locks, if you have them, to hold it in for a little low speed driving. I would worry about issues if the ground is very uneven because the frame can flex independent of the slide room and those locks only contact the flimsy facia around the slide room.

barmcd · 10-17-2021, 12:50 PM

All my previous plans for Saturday fell through so I was able to work on the slide yesterday and finished replacing the hoses in the basement before Baylor played BYU. Sic’em Bears!

The sync cylinder and tee connector for the hydraulic cylinders are now in the ceiling of the basement instead of over the fuel tank.

I replaced the two hoses that run under the coach to the hydraulic pump this morning. I was pleasantly surprised how easy it was. Once I disconnected the hoses at the pump, and cut the zip ties, I was able to pull them free and feed them into the basement from the wheel well. I only had to spend a few more moments under the coach to reconnect the new hoses.

I will use the HWH procedure to bleed the lines and three hydraulic cylinders tomorrow. I’ve done it once before to test the rebuilt sync cylinder, hopefully the other cylinders will work with no issues.

zmotorsports · 10-18-2021, 08:17 AM

Glad to hear the hose replacement went well for you Dennis.

wamcneil · 10-18-2021, 09:18 AM

Yeah, it's encouraging to hear that the hose replacement is not a big ordeal.
I'll be needing to replace mine and overhaul the sync cylinders sometime soon...
Cheers,
Walter

barmcd · 10-18-2021, 05:28 PM

Whew! I bled the system using the HWH procedure ( https://www.hwhcorp.com/ml39247.pdf ) and only had a hiccup or two. The slide room is reconnected to the hydraulic cylinders and it moves in and out pretty well. No racking evident. Tomorrow I'm going to check out the slide rollers under the cabinets and up under the wheel well.

Even though I had the instructions with me under the motor home, I somehow missed the step where you cap the manifold fitting after removing Hose A. Luckily, I wasn't in the line of fire. When Katherine pushed the slide extend switch, a stream of fluid shot eight feet out of that open fitting, past where I was lying on a creeper, and ricocheted off the front axle onto me! It took me a few seconds to figure out what happened, but the trail of oil led right back to that open fitting.

The whole process is tedious since I had to lie on my back to access the hydraulic pump. For some reason, I didn't drive the coach up on the double stack of 2X12s I normally use to raise the coach and there wasn't enough room under it to sit upright. Since I replaced the hoses and rebuilt the cylinders, I didn't have much fluid in the system. I had to run the pump a couple seconds, then top off the system to keep the fluid level above one inch below the top of the reservoir. It took awhile because there isn't much volume of fluid between one inch below the top and running out the top and down your arm.

Glad that is done.

Timaz · 10-19-2021, 04:28 PM

Congrats Dennis! I will get together with you if I ever have to do mine, LOL

Tim

barmcd · 10-26-2021, 10:14 PM

I had to remove the sync cylinder and one of the room cylinders because they were leaking. The sync cylinder was more a seep, but it was leaking and the room cylinder was pretty significant. I took them back and the tech said he originally replaced the seals with like items and they didn't leak when he applied pressure. He played around with them after I brought them back and they still didn't leak when he applied pressure, but if he turned his pump off and left it connected to the cylinder, they would eventually begin leaking. He replaced the original seals with a heavier seal and they held. Now, I have to remove the other room seal and take it back to get the heavier seal. If its not one thing its another.

barmcd · 10-27-2021, 10:27 PM

Quote:

Originally Posted by jdw1

Nice work!

How much pressure does the system work under?

Quote:

Originally Posted by barmcd

HWH says they use 2100 lbs. of pressure.

Specs here: http://www.hwhcorp.com/ml23567.pdf

Quote:

Originally Posted by jdw1

I read that and it looks like it makes 2100 lbs of force if I’m not mistaken…..

Doesn’t mention anything about Hydralic pressure on the system.

Quote:

Originally Posted by jacwjames

Seems like you will have to back calculate the pump pressure. Determine the diameter of the piston, calculate areas (A=r^2*Pi). 2100/Area should give you the pressure.

Still seems like a lot, no wonder when something isn't working right there is damage.

According to HWH document ml37939 https://www.hwhcorp.com/ml37939.pdf there is 3000 psi on both the rod and cap ends of the cylinders when operating.

Ali · 06-22-2022, 04:47 PM

Hi Dennis,

Awesome post as always

I remember reading this a few months ago and bookmarked it just in case. I am glad I did.

Recently I was replacing the fuel filter on the Hydro-hot and opened the wrong compartment by mistake. There I found our synchronizing cylinder, and noticed slight leak on one side. Before that I was curious about one side of the slideout extending and retracting a bit slower than the other (about an inch or so) and wondering why. I did not notice any leaks on the main cylinders or hoses. I am guessing I am going to have to remove sync cylinder and have the seals replaced

and see if it helps with the slideout operation.

barmcd · 07-04-2022, 10:40 AM

Quote:

Originally Posted by Ali

Hi Dennis,

Awesome post as always

I remember reading this a few months ago and bookmarked it just in case. I am glad I did.

Recently I was replacing the fuel filter on the Hydro-hot and opened the wrong compartment by mistake. There I found our synchronizing cylinder, and noticed slight leak on one side. Before that I was curious about one side of the slideout extending and retracting a bit slower than the other (about an inch or so) and wondering why. I did not notice any leaks on the main cylinders or hoses. I am guessing I am going to have to remove sync cylinder and have the seals replaced

and see if it helps with the slideout operation.

That one is easy to get to!