No it won't. Not unless you have a thorough understanding of the plastic involved. Nylon, for example, is formed of long, twisty molecules that intertwine with one another, resulting in a mostly-ridgid, somewhat flexible, self-lubricating solid. But if you use any lubricant, it allows the twisty molecules to disengage one another, resulting in a soft, mushy material unsuited for most uses.
Now, as I get it, this application doesn't use the commonly used shoulder bolt, a bolt with increased diameter for a region starting at the head and supporting the wheel, with a smaller diameter threaded region opposite the head. These bolts need only a nut as additional hardware, but obviously need the shoulder to be just a bit longer than the wheel's axle bore.
Instead, this application uses a bolt of constant diameter, with an added sleeve to perform the shoulder function. This situation gives an additional point of friction. Is the wheel rotating on a tightly-clamped sleeve (plastic on metal) or are the wheel and sleeve rotating on a tight bolt. This latter condition would result in a metal-on-metal contact which definitely should be lubricated.
My guess is that it's the former situation--the sleeve is tightly clamped when the bolt is sufficiently tight. There should be no noise from a plastic on metal contact. I wonder about end contact. No one has discussed the question of thrust. I'm wondering about either end of the wheel hub rubbing on the bolt head outboard or the mounting plate inboard. If there's a metal washer at either end, sticking to the wheel and rubbing against the underside of the bolt head or the mounting plates inboard, it certainly makes sense to lubricate these metat-to-metal contact surfaces.
I bought a bunch of hydraulic type stainless fittings to go on a boat. I asked if they were available in 316 grade. The supplier said that they could get them marked as any grade, but reckoned that they were all the same. Guess which country of origin !
My guess - the designer specified stainless steel spacers, the manufacture didn't check the quality of the material at incoming inspection. The (won't mention country of origin) spacer manufacturer got paid for 18/8 stainless, supplied sub-standard parts, and kept the change. Our company has had a similar experience with a split-pin supplier.
Good point, Tekochip. However, if they decide not to include grease before shipping, it would make sense to be very clear to the buyers that this needs to be added before usage. Including a package with grease would help as well.
From your description, the steel spacers sound like they were disc-like in appearance to provide a smooth plane for wheel rotation-? (to eliminate wheel wobble-?). If that's the case, I would have used polycarbonate (Lexan, or other PC) in the design. Much more water-friendly moving thru a wet lawn.
Vern, while there should have been grease on the part, it may have just been left off of your unit. Sometimes when you get into a new car the dealer will tell you that there may be coat of rust on the brakes, since they have not been used. This is not a problem. A few applications of the brakes and the rust is off. Most uncoated metal parts will acquire some surface rust. It would be interesting to know, from either the store or the manufacturer, if this was a problem others had reported.
It seems a shame that they couldn't include a little grease or at least a note to add some, since there may be hazardous shipment laws about including grease in the carton.
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