Air Bellows height difference
Submitted: Monday, Jan 14, 2008 at 13:30
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NicI
I've just had TJM fit a pair of Polyair bellows to a (brand new) leaf-sprung 4wd traytop ute, but with the same air pressure in each bellow there's a 30mm difference in ride height on each side.
The installation looks identical on each side, and the air hoses are the same length.
To equalise the ride height takes about a 20-30psi differential between the two bellows.
Is this normal, and if so is it practical ? I would usually run about 50-60psi with the traytop camper on, but with this imbalance one bellow would be at 80-90, which sounds rather high.
Any ideas or experience would be appreciated.
Reply By: Member - Nic I (NSW) - Tuesday, Jan 15, 2008 at 08:30
Tuesday, Jan 15, 2008 at 08:30
Thanks everyone for your suggestions, it is now likely that the bellows or their installation aren't at faultl; looks like it might be
the springs.
Yet to be confirmed, but it seems that one of the leaves on the driver's side may have been either incorrectly tempered or of the wrong grade of steel. This wasn't obvious until a decent load was applied, in my case about 700kg of camper, then - instant sag on that side.
It's obviously a warranty issue, but the bellows may have to be removed before the warranty is honoured.
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