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Topic: Level Alarm (Read 931 times) previous topic - next topic

Level Alarm

Would someone in the group verify the PSI number that triggers the level alarm on the dash?  My low air pressure alarm is set around 60 PSI, which seems normal, but the level alarm does not go off until 90 PSI.  I have been chasing down an air leak and I have my pressure holding a less than 2 PSI per hour, but at idle I'm still having the alarm come on while parking in a campground.  I first thought it was low air pressure because the old eyes are not as good as they once where.  Since the compressor does not come on until around 90 it seems that my pressure setting is incorrect or I need to replace the governor.

Thanks again for everyone's help.


Brad

2000 U320 4000

Re: Level Alarm

Reply #1 –
Brad,
I would lose air pressure during parking also.  In my case the unloader valve on the air drier was leaking.  I wasted a lot of time before I figured this out but there is an easy test.  While your coach is idling put your hand under the unloader valve and see if it is leaking.  In my case it was blowing a steady stream and I could only build air pressure at a very high idle.
John Cooper
'91 GV 36'
Oshkosh chassis
Cat 3208T 300HP

Re: Level Alarm

Reply #2 –
John,
You were correct in my issue.  The purge valve is just pouring air out while the compressor is running.  I replaced my governor which was easier than I thought. The old one was set or at least was working at 90/120 and the new one is 105/125, which is better.  James T. stated the level alarm should be between 85 and 90, so the 90 cut in pressure was too low.  When I fix the purge valve I should be golden.

Did you repair yourself?

Thanks,

Brad

2000 U320 4000

Re: Level Alarm

Reply #3 –
It is a normal hassel on a vehicle with air ride, air brakes, air dryer, air compressor, air governor, air level, air horn, height valves & air step, not to mention the 1/4 mile of air line.  These can drive folks nuts trying to locate one of em lil leaks.
Keep ears and eyes open and good luck
Dave

Re: Level Alarm

Reply #4 –
Just serviced the air dryer and found two huge leaks at the hose connections. All OK now.
Gary & Sharon Karnes
1999 295 WTFE 3600

Re: Level Alarm

Reply #5 –
Brad,

Yes, I was able to find a purge valve rebuild kit and followed the directions in the Bendix AD4 air dryer manual.  Finding the rebuild kit was a bit of a problem as many people I tried were out of stock.  One finally directed me to an authorized Bendix repair center that had the parts.
John Cooper
'91 GV 36'
Oshkosh chassis
Cat 3208T 300HP

Re: Level Alarm

Reply #6 –
John
I found a local shop that had the DQ6020 rebuild kit that included the purge valve for only $33.00.  The parts manager asked if I needed the DQ6026 kit too and said he would give me a bigger discount.  I ended up with both kit cheaper than on-line prices, but I guess the taxes and shipping are about the same in Texas.  I had it changed out in less than 30 minutes of actual work.  It took longer placing the safety blocks and draining all three air tanks. 

Thanks again for your help, as I did not even think to place my hand under the dryer and check for a leak.  My hearing is not very good (working with ATT/Southwestern Bell for 27 years really took it's toll on the ears) and I do not wear my hearing aids while working on the motor home or maybe I would have heard the leak. :)

Brad

2000 U320 4000
Brad

2000 U320 4000

Re: Level Alarm

Reply #7 –
RE Brad:  DQ6020 rebuild kit that included the purge valve    I had it changed out in less than 30 minutes of actual work
-----------------------------------
 
Brad, did you remove the air dryer from the mounting and remove air hoses from the air dryer?  Or did you install all the parts from the major overhaul DQ6020 kit while the air dryer was in place?

Re: Level Alarm

Reply #8 –
Barry,
I just replaced the purge valve at this time and plan to do the other two parts when I do the DQ6020 kit.  I believe it will have to be removed to access the turbo saver and check valve, but I do not know that for a fact.  I'm heading to Albuquerque for the balloon festival and needed to get it road ready. 

Thanks,


2000 U320 4000
Brad

2000 U320 4000