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If you look at the Dexter axle web site they have a service manual that you can download and it gives detailed information on servicing your axles.
On the "equalizer", the swivel bar between the two springs the center pivot bushing is usually nylon like the rest of the spring bushings. Spraying lubrication in there will not accomplish much. Especially if you don't disassemble the parts to lubricate them.
If you do not have the greasable spring shackles yet you need to look in to having them installed and they come with a grease fitting on that center bearing. Then you have brass oilite bushings instead of the thin nylon ones and you have grease fittings on all moving parts in the suspension. A very inexpensive upgrade that Keystone should start doing on all their units. My trailer has the new suspension and it handles much smoother on the highway. I know the suspension is solid and do not have to worry about that. So maybe its the piece of mind that I feel when towing.
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