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Steer Axle Height Control Valve Early ZF Suspension
#28

I believe I’ve discovered the smoking gun. 

Today I was finishing up the new sway bar arm by powder coating it before I installed it. 

In preparation to install the arm, I put the bus in travel height, pinned the HCV in the neutral position and disconnected the control rod. 

I had to go to work for a while today so I was away from the bus from 2pm until about 6:45 pm. 

When I went out to check on the bus, the steer air bags were at maximum inflation! It looked higher than I’ve ever seen it but it might be because I didn’t expect it to be that high. 

My assumption is the HCV is faulty and is passing air to the bags in the neutral position. I can only assume that this is my true problem with the steer axle travel height increasing as I drive and causing the alignment to drive poorly. 

I’m sure the mods I’m making will improve my situation but it is nice to know that I’ve found a smoking gun… 

Moral of the story… don’t let a tech weld your HCV arm to the valve shaft…. 

It’s always something….

Kristi & Jeff King
Bentonville, Arkansas
#744 2005 45’ Newell Coach 
ZF Suspension/Active Steering Tag Axle
CAT-13 ACERT KCB Engine 525HP 1642 ftlbs Torque Cat Compound Turbocharger 43.5 psi
Allison HD4000MH Transmission with PTO drive.
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Messages In This Thread
Steer Axle Height Control Valve Early ZF Suspension - by jdkskyking - 01-01-2025, 07:36 AM
RE: Steer Axle Height Control Valve Early ZF Suspension - by jdkskyking - 01-01-2025, 07:49 AM
RE: Steer Axle Height Control Valve Early ZF Suspension - by hypoxia - 01-01-2025, 09:37 AM
RE: Steer Axle Height Control Valve Early ZF Suspension - by cwl1979 - 01-01-2025, 12:41 PM
RE: Steer Axle Height Control Valve Early ZF Suspension - by afrench - 01-01-2025, 05:28 PM
RE: Steer Axle Height Control Valve Early ZF Suspension - by Richard - 01-01-2025, 06:44 PM
RE: Steer Axle Height Control Valve Early ZF Suspension - by jdkskyking - 01-02-2025, 07:07 AM
RE: Steer Axle Height Control Valve Early ZF Suspension - by jdkskyking - 01-05-2025, 07:36 AM
RE: Steer Axle Height Control Valve Early ZF Suspension - by hypoxia - 01-02-2025, 06:23 AM
RE: Steer Axle Height Control Valve Early ZF Suspension - by hypoxia - 01-05-2025, 08:11 AM
RE: Steer Axle Height Control Valve Early ZF Suspension - by jdkskyking - 01-05-2025, 08:53 AM
RE: Steer Axle Height Control Valve Early ZF Suspension - by hypoxia - 01-05-2025, 10:51 AM
RE: Steer Axle Height Control Valve Early ZF Suspension - by johnkosir - 01-05-2025, 10:54 AM
RE: Steer Axle Height Control Valve Early ZF Suspension - by jdkskyking - 01-06-2025, 02:22 PM
RE: Steer Axle Height Control Valve Early ZF Suspension - by Richard - 01-07-2025, 09:01 AM
RE: Steer Axle Height Control Valve Early ZF Suspension - by johnkosir - 01-07-2025, 09:58 AM
RE: Steer Axle Height Control Valve Early ZF Suspension - by jdkskyking - 01-07-2025, 03:25 PM
RE: Steer Axle Height Control Valve Early ZF Suspension - by cwl1979 - 01-07-2025, 03:54 PM
RE: Steer Axle Height Control Valve Early ZF Suspension - by jdkskyking - 01-07-2025, 04:23 PM
RE: Steer Axle Height Control Valve Early ZF Suspension - by jdkskyking - 01-07-2025, 04:40 PM
RE: Steer Axle Height Control Valve Early ZF Suspension - by jdkskyking - 01-07-2025, 05:54 PM
RE: Steer Axle Height Control Valve Early ZF Suspension - by jdkskyking - 03-01-2025, 07:56 PM
RE: Steer Axle Height Control Valve Early ZF Suspension - by cwl1979 - 03-01-2025, 08:26 PM
RE: Steer Axle Height Control Valve Early ZF Suspension - by jdkskyking - 03-01-2025, 09:06 PM
RE: Steer Axle Height Control Valve Early ZF Suspension - by cwl1979 - 03-01-2025, 09:23 PM
RE: Steer Axle Height Control Valve Early ZF Suspension - by Richard - 03-02-2025, 05:20 AM
RE: Steer Axle Height Control Valve Early ZF Suspension - by jdkskyking - 03-02-2025, 01:14 PM
RE: Steer Axle Height Control Valve Early ZF Suspension - by jdkskyking - 03-02-2025, 06:28 PM

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