Recent Posts

11

Technical Support / Re: Diesel leak and bad smell

« Last post by Preston Nash on October 18, 2025, 10:48:34 PM »

I finally got the coach back from Massey's Diesel Service.  They had to remove the steer axle and H-frame to drop the fuel tank.  They made a conduit to run new fuel lines to the engine and also replaced the lines to and from the generator and the Hurricane heater.  They charged me for 64.5 hours of labor.  The rate is normally $205/hour.  I negotiated it down to $140/hour, so the bill for the labor turned out being $9,030.   Massey's used to have a guy named Tom running the place.  He was a walking coach text book.  He retired a few years ago and it seems all of the knowledge there went with him.  I don't think I'll be taking the coach back to them.  So now I need to work on cleaning up the diesel in the storage bay and hope I can get rid of the diesel smell.  I also need to get the front ride height readjusted.  It's now way too low and rides and handles poorly.       

12

Technical Support / Re: Onan Fuel Pump Replacement

« Last post by Bill Heffernan on October 18, 2025, 05:09:55 PM »

Thanks, I'll be down there winterizing today. I'll run a test on the fuel lines. I don't think the fuel filter is the culprit, that was the first item I swapped out and there was no change in the generator dying. That's as always for the assistance.   

13

Technical Support / Re: Air Tank Replacement

« Last post by Eric Maclean Co-Admin on October 17, 2025, 11:21:23 PM »

Richard
Your going to have to count the number and size of ports on your existing tank and try to match them up but if I recall those original tanks had a couple of ports in the side of the tank which might be hard to match.

This tank may work but would require some replumbing.

https://www.4statetrucks.com/9-x-35-inch-air-tank-w-2-chamber-reservoir-03-05140004?srsltid=AfmBOoo9BmAMivEYARqLbyC9CLWON7eOai3HbASnWPVBOT5U3Qnm5Xmw

Eric

14

Technical Support / Re: Headlights not working??

« Last post by RogerMilne on October 17, 2025, 09:24:09 PM »

OK.There should be nothing except the dimmer switch between pin 30 of the headlight relay (R11) and VCB-11 or 12 depending on whether you have high or low beam selected. To make troubleshooting easier consider pulling F69 and jumpering from the cold side of the fuse to the pin 30 slot of R11. You should have a short between F69 and VCB-11 or 12 depending on dimmer switch position. The resistance to ground should be the same in either dimmer switch position as you will (should) be measuring the headlight bulb (LED) resistance only.
Steve

I’m out on the road for the next 4 days but will look at your idea when I get back. I’ll also later tonight when I get to my hotel PM you with some thoughts so as to not keep this post open to just back and forth convo.

15

Technical Support / Re: Air Tank Replacement

« Last post by Richard Davis on October 17, 2025, 09:10:24 PM »

I know this is a really old thread, but I am faced with the same problem of having to replace a leaking dual chamber split tank.  I have a 2006 Monterey built on a Magnum chassis left over from SMC.  The existing tank is 9 inch diameter and 34 inch total length.  One end is the primary wet tank with a check valve in the middle and a secondary tank on the other end. There is a stencil on the tank SMC9531 that I assume is the original part number from SMC.  All searches have ended up that this tank is obsolete and no longer available.  So, I suspect that I will have to find a tank with close dimensions and replumb the air lines as needed.  Does anyone have any suggestions as to how I should proceed?  Thanks
Richard     

16

Technical Support / Re: Onan Fuel Pump Replacement

« Last post by Eric Maclean Co-Admin on October 17, 2025, 04:24:41 AM »

Bill
Before you get into trying to get the pump out I would suggest you remove the fuel return line at the back of the Gen set and run a short piece of hose into a catch bottle to check your fuel return fuel flow this could help determine if the pump is keeping up.

Also on these coaches of this age it's not uncommon for the fuel line between the tank and the Gen set to get dry rotted and allow the pump to suck air causing fuel starvation issues you might want to remove the fuel feed and return lines off the back of the Gen set and run a good pair of lines into a can of diesel fuel to see if the unit will work properly.

Eric

17

Technical Support / Re: Onan Fuel Pump Replacement

« Last post by Steve Huber on October 16, 2025, 10:45:56 PM »

Bill
Suggest you replace the fuel filter even if current one is "new". It can cause the symptom you are describing and IMHO a lot cheaper and easier than going after the pump. Also make sure you have at least 1/2 a tank of fuel and the lines from the tank to the geni are in good shape. Code 36 indicates shutdown signal is coming from something other than the control board so I don't think that is your culprit.
Steve

18

Technical Support / Re: Onan Fuel Pump Replacement

« Last post by Bill Heffernan on October 16, 2025, 09:24:32 PM »

Thanks Zach. Ours is a HDKCA. What we are experiencing frequent shutdowns with a code 36. The filter is good and fuel levels are good. The options appear to be the fuel pump or control board. A fuel pump is a far less expensive option, so I thought I would start there. I didn't realize the challenge of getting to it.

19

Technical Support / Re: Headlights not working??

« Last post by Steve Huber on October 16, 2025, 09:08:45 PM »

OK.There should be nothing except the dimmer switch between pin 30 of the headlight relay (R11) and VCB-11 or 12 depending on whether you have high or low beam selected. To make troubleshooting easier consider pulling F69 and jumpering from the cold side of the fuse to the pin 30 slot of R11. You should have a short between F69 and VCB-11 or 12 depending on dimmer switch position. The resistance to ground should be the same in either dimmer switch position as you will (should) be measuring the headlight bulb (LED) resistance only.
Steve

20

Technical Support / Re: Headlights not working??

« Last post by RogerMilne on October 16, 2025, 07:30:52 PM »

Roger,
Remove the headlight mod relays and see if F69 blows when low beam is selected. If it does, problem is between the F69  and the removed relay. If not, problem is between relay and headlights. Then I'd first try installing the high beam mod relay in place if the low beam one to verify the original relay isn't bad. If that's not it verify that pin 87 of the low beam relay is wired to VCB-11.
Steve

Hey Steve.
I have inadvertently removed all the mod' and relays and ditched them. I now know that it appears the PO had done the mod' and I was unaware of it and assumed the relays were for the light bar. So the quick answer to your reply is YES when I select Lo Beam F69 blows. BUT only when I reconnect the wire that he spliced (which is the one in the picture in the previous post). So I'm heading down the path of it's not a relay issue( as they are both eliminated) but trying to reconnect the VCB-11 and VCB-12 back to original , if that makes sense.