Does 20PSI ring any bells?

[Rick]

Originally Posted by Pjanecke

Thx for the lead - unfortunately the line from my Shrader valve heads directly forward through the bulkhead. So l’ll need to get the bus on stands to investigate it.

I did find leaks at the footrest slide and door lock solenoids - waiting for parts to arrive.

Still can’t find where the pressure switch for the steps is hidden?

The Shrader valve is under the engine hatch at the rear of the coach. Raise the hatch and look right above the bumper toward the curb side of the coach. It looks like a valve stem for a car tire. What you are seeing that deadheads into a bulkhead is the air chuck to attach an air hose to air up your tires or beach toys.


The pressure switch for the steps is mounted on the inside edge of the step frame. At least that's where I've always found it.

[Pjanecke]

Originally Posted by Rick

The Shrader valve is under the engine hatch at the rear of the coach. Raise the hatch and look right above the bumper toward the curb side of the coach. It looks like a valve stem for a car tire. What you are seeing that deadheads into a bulkhead is the air chuck to attach an air hose to air up your tires or beach toys.

i did a bad job explaining - we’re both talking the tire valve in the engine bay. It’s hose runs past the starting batteries and forward through the crossmember above the transmission. Have to lift the bus to see where it goes next.

Originally Posted by Rick

The pressure switch for the steps is mounted on the inside edge of the step frame. At least that's where I've always found it.

The solenoid valve body is there on mine but the “furnas” pressure switch that makes the step retract when air gets low is what I can’t find. I want to check it for leaks since I already replaced a leaky one for my aux compressor

[SNOWBIRD]

My step pressure switch is behind the lower electrical panel forward of the passenger seat.

The pressure protect valve I was talking about is t-ed off right at the schrader valve. It is a very small valve.

[Pjanecke]

Originally Posted by SNOWBIRD

My step pressure switch is behind the lower electrical panel forward of the passenger seat.

The pressure protect valve I was talking about is t-ed off right at the schrader valve. It is a very small valve.

Perhaps coaches like mine without the bulk oil tank don’t have that PPV.

[Pjanecke]

Originally Posted by giderich

Auxiliary system air leaks; air toilet, air slide(s), air step, air slide over entry, air horns, air sewer dump valves, air solenoid for steering tag axle, air purge valves on aux tank & wet tank, Allen Air solenoid valves (horns), low pressure air switches (30 psi & 60 psi), Baby (1 gallon) slide/toilet air tank for slide/toilet (8 or 10 places for leaks), several one-way check valves in systems (look at air diagram). Do not over-look the Air compressor, air dryer, air governor, and associated plumbing. Also check the 3 (three) WM47P suspension dump valves, 3 HCVs (Height Control Valves) and double check the air lines to each of the 10 air bags (springs). Leaky pressure protection valves. (see air diagram).


Several small leaks can add up to a large leak. Use shop air (not that that silly 12 volt Viair) to pressurize the system since it will take a few hours it address all the air leak possibilities.

Getting shop air was a great suggestion. I’ve been able to locate and fix several accessory leaks. Never any hiss, just soap bubbles. Good progress but dump console gauge still leaks down to zero over 2 hours or so. I’ve been crawling around below spraying connections and fittings and dump valves and height control valves. I haven’t spotted the PPV valve though - where should it be on the 43LXI?

I think I’ve vindicated everything up to and including the PPV valve with the following test:
I set the shop compressor to less than 65psi and the pressure held (no cycling of the shop compressor. Above 65psi the PPV opens to the air suspension and accessories, and then the shop compressor has to cycle over and over to maintain.
So I think that means my new governor and new air dryer and all the tanks and their drains are OK.
All the remaining leaking is in accessories and suspension.

[rrueckwald]

In mine the major leaks were the PPV at the bulk oil fill, which I removed from the bus entirely, and a "T" in the air horn lines in the cabinet above the passenger windshield. There were lots of little leaks, but I replaced every cheap air fitting with DOT fittings and that did the trick. It's like an Easter Egg Hunt....

[Pjanecke]

Originally Posted by rrueckwald

In mine the major leaks were the PPV at the bulk oil fill, which I removed from the bus entirely, and a "T" in the air horn lines in the cabinet above the passenger windshield. There were lots of little leaks, but I replaced every cheap air fitting with DOT fittings and that did the trick. It's like an Easter Egg Hunt....

Thx,

I don’t have bulk oil, but I guess I better open the cabinet above windshield- it would be pretty hard to hear a leak up there hissing.

[Randy Dupree]

check the step area and the waste valve switchs and your right,the air lines going to the air horns can leak too

[SNOWBIRD]

There is also an air line that goes up to the side panel next to the passenger seat that goes to the control switch for the slide over the steps.

[Pjanecke]

Thx,
Worst leak so far was a Tee at the bottom of the front curb wheel well. Now DOT.

Where does the bouncy seat (ESRI) air route?