Broke down

Topic: Broke down (Read 3395 times) previous topic - next topic

Re: Broke down

Reply #50 – July 03, 2022, 11:03:22 pm

Quote from: Moby – July 03, 2022, 10:02:06 pm

So, hes dangerously close to having his brakes lock up if he were moving in that video?

Was stopped and testing

Thx

Re: Broke down

Reply #51 – July 03, 2022, 11:43:13 pm

Quote from: Moby – July 03, 2022, 10:02:06 pm

So, hes dangerously close to having his brakes lock up if he were moving in that video?

So spring brakes don't lock up. They apply there full force but is less than fully applied brake. Many variables with different brakes and weights, but on my coach if you set the parking brakes you will come to s safe controlled stop using only the rear brakes as they are only installed on the rear.

Re: Broke down

Reply #52 – July 04, 2022, 12:28:00 am

Quote from: Cpt_kludge – July 03, 2022, 05:48:29 pm

Looking for the whistling after shutdown.

Lift up the bed platform. Look around your engine compartment walls. If you see anything that looks like the photo below then that is the Bendix cruise control setup. See if the "whistling sound" is coming from any of the components on that plate. If it is, that component might be the source of your high idle problem. Let us know what you find.

Re: Broke down

Reply #53 – July 04, 2022, 12:38:15 am

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Re: Broke down

Reply #54 – July 04, 2022, 12:43:25 am

When the parking brake is applied or the pressure drops below 45 psi or so, it will apply but the spring in the can cannot come anywhere near the air pressure your brake pedal applies when you step on the brakes. That's why the parking brake should only be used on flat ground and with even a slight slope, chocks should be placed in front and behind a wheel.

To check the effectiveness of the parking brake, apply it at about 30 mph and you will be surprised by the distance it takes to stop the coach.

If the service brakes are heated on a downgrade to the point of losing effectiveness, applying the parking brake will do absolutely nothing so should never be considered as any kind of safety resort. I overheated the brakes on (at 10 mph) a steep mountain road above Malibu, CA in first gear! Applying the Anchor Lok/parking brake did nothing and I had to put the right side wheels of the fire truck down into the dirt shoulder to get it to stop.This is what happens when a city is too cheap to put a Jake brake on the truck but still sends it to fight campaign/out of town fires.

Pierce

Re: Broke down

Reply #55 – July 04, 2022, 09:35:52 am

Quote from: Cpt_kludge – July 03, 2022, 08:34:00 pm

Less that WOT for me. That is about 2600 RPM. Guy at Foretravel thought it was a reaction to overheat. did NOT tell me how to tun it off

As BW said in reply #31, the 3116 is not computer controlled. The guy at FOT was just mistaken.

Re: Broke down

Reply #56 – July 04, 2022, 09:45:26 am

If you happen to be headed north, Mark at MC Diesel in Albuquerque is a great Cat mechanic. He might be willing to work on the throttle/cruise issue. If you do go there, have him adjust your injectors and valves.
M.C. Diesel | Albuquerque Diesel Mechanic |

Re: Broke down

Reply #57 – July 04, 2022, 09:55:36 am

Wagner is the Caterpillar dealer right there in Las Cruces.

No nothing about them, but they could certainly get you a new thermostat (Cat calls them regulators) and gasket. Just need your engine serial number.

Wagner Rents
2501 W AMADOR AVE
LAS CRUCES, NEW MEXICO
United States of America 88005-4014
Phone 1 575-647-9700
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Re: Broke down

Reply #58 – July 04, 2022, 06:45:45 pm

I'm back.
Looks like the 2100RPM and whistling is definitely the Bendix. Cannot see where the sound is coming or feel any blow by but it all corresponds to 78lb of pressure. When you shut down, the whistle persists till about 60lb and after you start, starts at 78lb where it pulls on the cable. Posting videos (smaller).
All videos are here!
https://www.dropbox.com/s/wz7c5zktkq1z7gk/20220704_155309_1.mp4?dl=0
https://www.dropbox.com/s/j3brhzzrucf16qz/20220704_155548_1.mp4?dl=0
https://www.dropbox.com/s/mn89ufhruta1f0z/20220703_115507.mp4?dl=0

Re: Broke down

Reply #59 – July 04, 2022, 06:48:44 pm

Wonder if the RV-1 Reducing Valve is bad and the bendix is getting way over pressured?

What did you find when you opened the tank drains?

Re: Broke down

Reply #60 – July 04, 2022, 08:36:08 pm

Quote from: wolfe10 – July 04, 2022, 06:48:44 pm

Wonder if the RV-1 Reducing Valve is bad and the bendix is getting way over pressured?

What did you find when you opened the tank drains?

Where are the drain tanks?
I never see more than 112lb on the dash air gauge.

Re: Broke down

Reply #61 – July 04, 2022, 09:19:19 pm

So you have tracked the "whistling sound" down to the vicinity of the Bendix assembly. Now you need to pinpoint the location of the leak. I would suggest you make up a water+soap solution. You can make your own with liquid hand soap, or dish washing soap, or buy a bottle of child's bubble making solution. Spray the whole Bendix assembly with soap solution and look for the bubbles. It should not be difficult to find the leak - it sounds pretty substantial.

Once you have isolated the source of the leak, either repair it (if possible) or replace the defective part.

Several Forum members have suggested that a faulty RV-1 could be a likely cause of the problem. If so, you might start researching a source for a new RV-1. If possible, get one that is already set to output 60 psi because that is the desired pressure down stream of the RV-1. If you can't find one set for 60 psi, they are adjustable, and setting can be changed after installation.

Pressure Reducing Valve | RV-1 | Pressure Limiting Valves | Valves |...

Re: Broke down

Reply #62 – July 05, 2022, 10:13:31 am

Quote from: Cpt_kludge – July 04, 2022, 08:36:08 pm

Where are the drain tanks?
I never see more than 112lb on the dash air gauge.

This from the 1993 U240, but likely applies to yours as well.

Aft tank drain in front of driver's side rear tire.

Front tank drain below front grill.

Both are 90 degree valves-- no tools needed.

Let us know what you find: nothing but clean air, water, oil, white powder.

Re: Broke down

Reply #63 – July 05, 2022, 11:52:06 am

Quote from: Twig – July 05, 2022, 11:39:20 am

Are you still in Las Cruces? I'm 40 miles away.

thanks, i'm leaving for El Paso within the hr.

Re: Broke down

Reply #64 – July 05, 2022, 01:30:49 pm

Quote from: Cpt_kludge – July 05, 2022, 11:52:06 am

thanks, i'm leaving for El Paso within the hr.

Well, good luck with the drive.

https://youtu.be/BIRL_iu3eQM

When you settle down again, does your air dryer purge on a regular basis? If yes, buy a D2 governor fo a spare and crank your existing D2 governor up so the air dyer purges at 120 PSI.

If you can hear air leaking you can most likely find it with your hand. 600 PSI steam your use a corn broom, 120 PSI air your hand.

Your throttle problem runs on 60 PSI air. Your "throttle" problem is either the foot feed in the front leaking or more probably a bad 60 PSI regulator in the rear. First step 120 PSI main air. Second step is getting no more than 60 PSI to the air throttle.

"Yesterday, talked to someone at Foretravel. Not Randy.
He agreed that the 2100rpm was prolly a reaction to the overheat to get the coolant moving faster."

Randy was born into a world run with microprocessors. Your engine and air throttle was not.

Re: Broke down

Reply #65 – July 05, 2022, 02:55:53 pm

As an aside......there IS a Rosa's Cantina in El Paso and it's worth the visit. Shirts are pricey but also worth it.

Re: Broke down

Reply #66 – July 05, 2022, 03:20:06 pm

We had lunch there but after we left, I had a deep burning pain in my side. Better option is the T.... Twister not far over the border. It gets wild after dark.

Pierce

Re: Broke down

Reply #67 – July 10, 2022, 09:36:19 pm

Quote from: wolfe10 – July 05, 2022, 10:13:31 am

This from the 1993 U240, but likely applies to yours as well.

Aft tank drain in front of driver's side rear tire.

Front tank drain below front grill.

Both are 90 degree valves-- no tools needed.

Let us know what you find: nothing but clean air, water, oil, white powder.

Finally was able to check. No valves or petcocks. Opened a hose on the bottom. Nothing but clean air.
Closed it back up. The KOA in Austin TX has a Diesel Tech that lives there. He checked it out, said air was fine. poked and proded and decided the Bendix was bad. I decided to limp it home at 2100rpm's.
Yesterday about noon I got tired on the road, pulled off and took an hour nap.
When I started it up, everything ran normally and continues. I'm in Las Cruces NM
Worst thing when problem in intermittent. Hope it stays gone until I can get into the Bendix and check it out! Intermittent of some kind when it gets hot.

Re: Broke down

Reply #68 – July 11, 2022, 02:48:08 pm

You couldn't find the air tank drains???

Which Bendix component was diagnosed as bad-- compressor or air dryer?

Re: Broke down

Reply #69 – July 11, 2022, 03:57:17 pm

My compressor pumps straight into the wet tank and then back to the dryer . That tank drip valve always has moisture in it.

Re: Broke down

Reply #70 – July 11, 2022, 04:35:57 pm

Quote from: Protech Racing – July 11, 2022, 03:57:17 pm

My compressor pumps straight into the wet tank and then back to the dryer . That tank drip valve always has moisture in it.

Unusual routing. Usually it is compressor, air dryer and then wet tank.

Re: Broke down

Reply #71 – July 12, 2022, 08:44:01 am

FWIW, Both air tanks on our U240 are in the front and both have drain hoses running to 1/4 turn valves that are mounted just below the HWH tank under the front end. Looks factory...

Re: Broke down

Reply #72 – July 12, 2022, 07:10:03 pm

Quote from: Dave Larsen – July 12, 2022, 08:44:01 am

FWIW, Both air tanks on our U240 are in the front and both have drain hoses running to 1/4 turn valves that are mounted just below the HWH tank under the front end. Looks factory...

Our U225 is the same.

Re: Broke down

Reply #73 – July 23, 2022, 03:01:15 am

Quote from: wolfe10 – July 11, 2022, 02:48:08 pm

You couldn't find the air tank drains???

Which Bendix component was diagnosed as bad-- compressor or air dryer?

The only Bendix I know of is the Cruise control at the rear firewall under the bed.
IAC I'm back home. Tested pos for Covid and am waiting out the 10 days.
The ONLY issue I had after the Bendix fixed itself was Overheating coming up the Syskiyu's in Southern Oregon.
I'm taking it to Oregon Motorcoach in Eugene, the end of Sept to have them go thru the entire cooing system and make sur the fafs are turning properly. Also having them go thru the Onan Genny.

Re: Broke down

Reply #74 – July 23, 2022, 08:35:54 am

Quote from: Cpt_kludge – July 23, 2022, 03:01:15 am

The only Bendix I know of is the Cruise control at the rear firewall under the bed.

I think Mr. Wolfe is referring to the entire air throttle-air brake system as being manufactured by Bendix.

"We" think that your air throttle pressure regulator is flaky. Main air is 90-120 PSI and is lowered by a dedicated pressure regulator to 60 PSI for the air throttle system. Your foot feed operates a variable pressure regulator to, well, regulate the pressure sent to the air cylinder that controls the amount of fuel being fed to the engine.

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