[Archived]

That’s what I’m getting at Godfather. I had 2 coaches with HWH leveling only and a constant problem was the system would get off kilter thinking it was level and wasn’t.

It was 4 corner leveling and I always had a problem with auto level. You would have to try and recalibrate it for level, I and others never could get it right on both coaches.

That’s why I wonder why they would put an HWH system in a bus with a level low system that is pretty good just to achieve auto leveling.

Later

bv

[Jerry]

If when the bus raised back up on its own, does it go to ride heith and stop,

or does it raise higher? Could it be signaling both drive posistion and level low

through the switch?

[Archived]

Yes it does come to ride height and stop. But as mentioned only the front does it. When the HWH is turned off (Green light on) and the coach is in ride height mode port 3 on the 5 solenoid valve in the run bay is open shifting the control vavles (2 5 way in the rear and 2 3 way in the front) is pressurized shuttling the valves to enable ride height thru the ride height valves.

The HWH is tied in to the coach system is via the 5 port manifold in the front run bay. It acts like and automatic level low system.

What I believe is happening is the 3 way valves are being de engerized when level low is selected, but due to a failed 3 way air is still getting to the bags from the ride height valve due to a failed 3 way.

When the 3 way valves are de engerized the level low switch control the air flow. When the rotary switch is moved to a position, port 3 on the manifold is deactivated When the rotary switch is set to front it enables the rockerswitch to control the air in the bag. When you press lower is lets air in the bag flow back to the manifold and exhaust. When you press raise is enables air to flow to the bag thru the manifold.

My theory is when you lower the front end the ride height valve is calling for raise, since the 3 way has failed it allows the ride height valve air to reach the bag , thus raising it until the ride height valve is satisfied.

Tomorrow when I get back to the coach I can further test this by disconnecting the ride height valve and pin it in the satisfied position and see if the issue goes away. I will most likely do that.

[Richard]

I thought maybe by knowing the air path it was taking

to fill them would help in diagnosis for you guys more

in the thick of it. Hang tough and be safe.

[Walter]

Okay, my brain got the best of me .

I went out the the shop, disconnected and pinned the ride height valve in the neutral position (5/32 drill bit works great for this). Then lowered the coach with the level low system and waited about an hour and the front end did not raise. This pretty much proves one or both of the 3 way valves are stuck or have failed.

It makes me feel good to be confident that is what it is.

Of course, they are mounted in a place that requires some contortion to get to.

So, when they get here tomorrow, I will feel good when I am done. But most likely sore… lol

[Jim/Chris]

I’m not sure I follow your description of how air is exhausted from the front air bags.

The only air that should ever escape through the 5 port solenoid valve manifold is the Norgren valve pilot air. When the solenoid valve on the manifold opens it is sending signal air to the actuator on the end of a Norgren valve. If the solenoid valve closes the actuator will not return to the normal position unless the pressurized air to the actuator is exhausted and that is the air heard coming back through to 5 port manifold solenoid valve.

I believe the air for all three positions on an unaltered Level Low system exhausts from the air bags out the 3 port valve on the steer compartment bulk head. With a Liberty modified system air from the rear is exhausted from solenoid actuated 3 port valves in the front bottom of the steer compartment.

Unless the center solenoid valve is actuated the ride height valves should have no impact on the coach. When the center solenoid valve is energized it shifts the control valves to open a path for air through the ride height valves. In every other setting other than the road or driving position the ride height valves will not function. If they are something is very wrong.

[Davy]

Final Update

First the orginal issue was when in level low the front of the coach would raise with no command from the rocker switch.

The 3 way valves arrived yesterday. I changed both of them.

Set the coach to a low level and kept air applied to the aux tank. After sitting overnight the coach has not moved. This indicated one or both of the 3 way valves were internally leaking.

If you are are having leveling issues, a suggestion is to use the level low system. It overrides the auto leveling system in your coach. Most are HWH. Use the level low to set the coach, if that position changes, like mine did, it indicates the issue is on the chassis side of the leveling system.

Thanks for the toughts on thsi issue fro mthe group.