Re: Air Dryer Bypass Demo Reply #75 – September 06, 2017, 09:11:36 pm We are all fixed up and hope to leave first thing in the morning. Thank you all for your help. Once again Foretravel friends are priceless, you almost make braking down fun Going forward like a oil/filter change just get a rebuild Air Dryer once a year? I understand the bypass valve and all that to use when it stops working unexpectedly but what is the common practice should be? Mine was rebuild by FT 17 months ago and since than we only had about 3-4000 miles. Those elbow fittings are not practical & I plan on getting straight ones, anyway. Quote Selected 1 Likes
Re: Air Dryer Bypass Demo Reply #76 – September 06, 2017, 09:17:21 pm I think every two years would be plenty adequate as far as getting "remanufactured" air dryer. Definitions of "rebuilding" varies too much depending on who does it. As to the elbows, our air lines wouldn't meet up with the fittings on the air dryer without the elbows, your must be a bit different.DonQuote from: propman – September 06, 2017, 09:11:36 pmWe are all fixed up and hope to leave first thing in the morning. Thank you all for your help. Once again Foretravel friends are priceless, you almost make braking down fun Going forward like a oil/filter change just get a rebuild Air Dryer once a year? I understand the bypass valve and all that to use when it stops working unexpectedly but what is the common practice should be? Mine was rebuild by FT 17 months ago and since than we only had about 3-4000 miles. Those elbow fittings are not practical & I plan on getting straight ones, anyway. Quote Selected 1 Likes
Re: Air Dryer Bypass Demo Reply #77 – September 06, 2017, 09:20:55 pm I sure hope can go for 2 years. If it wasn't for the steep core charge i would almost starting to have a spare after 12 months. Yes for ours straight fittings will work just fine, I wonder why they did not do it like that to start with, who knows. Quote Selected
Re: Air Dryer Bypass Demo Reply #78 – September 06, 2017, 09:24:25 pm Actually, I am comfortable with every three years. But, I really like the factory (i.e. the factory that made them) re-man, as all valves, heater and filters are new. Quote Selected 3 Likes
Re: Air Dryer Bypass Demo Reply #79 – September 07, 2017, 06:56:57 am I am happy to just install the Haldex service kit every 18 months per the FT service schedule. Quote Selected 2 Likes
Re: Air Dryer Bypass Demo Reply #80 – September 07, 2017, 10:16:28 am I replaced ours last year with a spin-on with heater/etc. It was the OEM with 100,000 miles but seemed to be working fine. Just figured it was time. The spin-on changes in a couple of minutes.Pierce Quote Selected 1 Likes
Re: Air Dryer Bypass Demo Reply #81 – September 07, 2017, 05:32:22 pm Quote from: Pierce & Gaylie Stewart – September 07, 2017, 10:16:28 amI replaced ours last year with a spin-on with heater/etc. It was the OEM with 100,000 miles but seemed to be working fine. Just figured it was time. The spin-on changes in a couple of minutes.PierceWhich brand, SP?Thank you,AL Quote Selected
Re: Air Dryer Bypass Demo Reply #82 – September 07, 2017, 09:24:11 pm I called Bendix today and talked to a Tech Person and asked how often my AD9 Dryer needed servicing. His answer was all applications are different. But he said when you change one keep track of how long until you start seeing an accumulation of water discharge from wet tank when you drain it. Then back it up a month and change at that interval. I asked about a suitable replacement with a spin on filter and he recommended one But it has the air governor built into it and I would not use the Governor on the compressor D2. I don't think I want to change D2 are cheap and easy to replace when needed. Having governor built into dryer to me might not be as easy to service.They always crap out at the worst time and place. I have been getting water out of my wet tank every couple weeks but the only compressor running is the 110 volt that occasionally comes on to refill air bags. Does that air go through wet tank? I guess I need to pull out coach books when I get back off the road. Quote Selected 1 Likes
Re: Air Dryer Bypass Demo Reply #83 – September 08, 2017, 07:17:00 pm Quote from: propman – September 07, 2017, 05:32:22 pmWhich brand, SP?Thank you,ALThink most of the aftermarkets are made in Poland by the same company. Germany is the original. I purchased ours from National Drivetrain for about $90-100 delivered. Quality looks excellent. Make sure to loosen and then tighten the spin-on once you have it installed as they are really stiff. I did need to buy a couple of inexpensive fittings. Make sure the hydraulic hoses do not touch each other after installation or they will fray and fail. AIR DRYER ASSEMBLY - REPLACES MERITOR WABCO SYSTEM SAVER 1200 SERIES R955205...I modified the old bracket and then did a really quick powercoat on it. Buy a crow's foot before starting. Here is the link to the Google album showing the installation and crow's foot. Wabco-Meritor 1200 Air Dryer U300 Installation - Google PhotosFor owners with problems on the OEM dryer, make sure the power to the heating element is hot (12V).Pierce Quote Selected 2 Likes
Re: Air Dryer Bypass Demo Reply #84 – September 08, 2017, 09:33:38 pm Thanks Pierce, Changed out my D 2 today as it took a lot longer than normal for pressure to build. Thought all was good , came home tonight, fired it up to build enough air to get the jacks under it and it still took way too long. Once up it holds air for a few hours with no signs of leaks. Does this sound like the dryer control line is suspect? Quote Selected
Re: Air Dryer Bypass Demo Reply #85 – September 08, 2017, 10:12:53 pm Quote from: stump – September 07, 2017, 09:24:11 pmI called Bendix today and talked to a Tech Person and asked how often my AD9 Dryer needed servicing. His answer was all applications are different. But he said when you change one keep track of how long until you start seeing an accumulation of water discharge from wet tank when you drain it. Then back it up a month and change at that interval. I asked about a suitable replacement with a spin on filter and he recommended one But it has the air governor built into it and I would not use the Governor on the compressor D2. I don't think I want to change D2 are cheap and easy to replace when needed. Having governor built into dryer to me might not be as easy to service.They always crap out at the worst time and place. I have been getting water out of my wet tank every couple weeks but the only compressor running is the 110 volt that occasionally comes on to refill air bags. Does that air go through wet tank? I guess I need to pull out coach books when I get back off the road.I got a remanufactured AD9 for $155 with a $90 core charge, so only $65 to replace the whole setup. D2 was $15ish. Quote Selected
Re: Air Dryer Bypass Demo Reply #86 – September 08, 2017, 10:32:20 pm Quote from: Protech Racing – September 08, 2017, 09:33:38 pmThanks Pierce, Changed out my D 2 today as it took a lot longer than normal for pressure to build. Thought all was good , came home tonight, fired it up to build enough air to get the jacks under it and it still took way too long. Once up it holds air for a few hours with no signs of leaks. Does this sound like the dryer control line is suspect? To figure it out, we need to find out where the pressure goes down to and how long it takes to get there after you shut down. If it's in the cycle range, it should build from 80 psi to 100-110 psi in a minute or so. If it's below, it could be an airbag leak or possibly related to the dryer. As I remember, once ours goes below 80 psi, it seems to take forever to come up. The tanks and bags take a lot of CFMs to get to the 80 psi mark.First, I like to listen for leaks, then I bring out the small Hudson sprayer with soap or better yet, go to your local party store and get 8 oz of Pustefix. Bubbles don't pop and last a long time. Any leak anywhere will show up. Amazon.com: Pustefix Premium Bubbles Refill 8.3 fl.0z.: Toys & GamesOK, driving down the road, how often does your compressor cycle? Pierce Quote Selected As an Amazon Associate Foretravel Owners' Forum earns from qualifying purchases.
Re: Air Dryer Bypass Demo Reply #87 – September 08, 2017, 11:34:40 pm The slow pressure build is new . Last time out , 3 wks ago, pressure built in a few minutes at low idle to 100. The build was linear all the way up. Today it builds to 50 right away and then sits @ about 70 for few minutes. I listen well for leaks , found a small one at the dash vacuum motor that was not in use. Plugged it off. The park handle has a very slight hiss some times but always has had it. No loss when pushed in. I sprayed the bags/ look old but sound and test tight. This morning ( getting to move the bus to high ground) air would not go to 80. New D2 built to 50 in a minute but took 5 min to get to 80 and then went quickly to 125 and stayed 125 . Shut down air stayed about 100 for 5- 10 min and still showed 60 or more on the red needle and 70 on the green needle after 6 hrs. Quote Selected
Re: Air Dryer Bypass Demo Reply #88 – September 09, 2017, 08:05:47 am I don't know if your air compressor is anything similar to the Bendix one on my crane, but I had unloader valves sticking causing a similar problem. Quote Selected
Re: Air Dryer Bypass Demo Reply #89 – September 09, 2017, 11:05:39 am Besides the unloader valve, you might take a look at the compressor head. Jerry Maddux recently overhauled his and is the expert here. Pierce Quote Selected 1 Likes
Re: Air Dryer Bypass Demo Reply #90 – September 09, 2017, 12:03:16 pm Or a sticking purge valve on the dryer, it's before the check valves so once tank pressures are up they tend to stay up and it don't show up in a leak down test, same goes for any lines before the check valves. Quote Selected
Re: Air Dryer Bypass Demo Reply #91 – September 09, 2017, 06:19:26 pm The unloader and purge valves are my suspects as I read more about how it works. Pretty sure the compressor is good as it recovers,builds quickly from multiple brake use. right back up to 120. Is there a way to block the purge valve to check the rest? Taptap test?. BTW, Thanks for the tips regarding the spare D2 in the bus , I would have been beached without it for sure . This forum has been a life/wallet saver.. Quote Selected
Re: Air Dryer Bypass Demo Reply #92 – September 09, 2017, 06:34:12 pm Might be able to put some foil duct tape over the purge port and see if that helps to identify a leak Quote Selected
Re: Air Dryer Bypass Demo Reply #93 – September 10, 2017, 01:13:19 pm Bendix manuals here;Equipment Bendix Commercial Vehicle Systems User Manuals - Read online or... It looks like the early Cart uses a Tuflo 501, belt drive . The unloader valve is inverted under the head. Drain coolant to compressor level , remove head etc. Quote Selected
Re: Air Dryer Bypass Demo Reply #94 – September 10, 2017, 02:11:58 pm I freed my unloader by spraying Corrosion X in the port from the governor. Hasn't stuck again going on 6 mo. Quote Selected 1 Likes
Re: Air Dryer Bypass Demo Reply #95 – September 10, 2017, 04:43:21 pm Will try that . Thanks,MM Seems to help. Has built air 4 times solid . Quote Selected 1 Likes
Re: Air Dryer Bypass Demo Reply #96 – September 14, 2017, 12:55:48 pm What happens when an air dryer fails...........does it become blocked that air won't pass through it?If that's the case then why not incorporate a shut-off valve linking the two air lines (like an H pipe exhaust) anywhere before the dryer? Then in the event of failure you should only have to just open the valve, and not get dirty. Quote Selected 1 Likes
Re: Air Dryer Bypass Demo Reply #97 – September 14, 2017, 01:01:33 pm Worse, way worseDesiccant is like fine talc and contaminants the valves in the HWH system. Major $$$ and PITASystem doesn't stop working, but components do Quote Selected
Re: Air Dryer Bypass Demo Reply #98 – September 14, 2017, 01:05:28 pm Quote from: Travelin' Man – September 14, 2017, 12:55:48 pm1. What happens when an air dryer fails?2. Why not incorporate a shut-off valve linking the two air lines (like an H pipe exhaust) anywhere before the dryer?1. Search "air dryer failure" on this Forum. You'll be treated to all the gory details!2. This has been discussed. See Reply #3 and Reply #9 in this thread. Quote Selected
Re: Air Dryer Bypass Demo Reply #99 – September 14, 2017, 01:45:34 pm I understand..................thanks guys. Quote Selected
Topic: Air Dryer Bypass Demo