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Tool Talk Discussion Forum

Re: Where to Mount the Trailer Axle

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willie in mn

09-15-2013 00:14:03

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Depends on the axle. The spring perch on the axle has a hole for the spring center bolt head. Should be a snug fit for the round head of the center bolt. I don't have a chart handy, but different spring ratings have different sized center bolts, to match the hole in perch of same rated axles. This keeps the axle in place, otherwise it can slip in the U bolts & run "dog tracked". Light duty solid square bar axles might just have a shallow hole drilled to accept the spring center bolt head. Also, believe it or not, there is a "right side up" to the axle. If you look closely, there is a slight curve,bend, or camber to the axle. When installed correctly, the center of the axle will be slightly higher than the ends, & the wheels will tilt just a bit outward at the top. When loaded this affects tire & bearing loading. A skilled welder can reposition the spring perch, but exact location in relation to the camber is critical. Just a few degrees off in locating the perch will set the wheels toed in or out, making it pull harder & increasing tire wear. So much for axle position, more thoughts to follow.

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willie in mn

09-15-2013 00:39:20

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 Re: Where to Mount the Trailer Axle in reply to willie in mn, 09-15-2013 00:14:03  
More design factors.
The 3 in tube axle & its hubs, wheels can get pretty heavy. Auto engineers call it "unsprung weight". Don't have the exact numbers, but to ride decently, it has to be a small percentage of the total weight. Too much "unsprung" weight will make it bounce all over the road. Spring travel or deflection- even class 8 trucks with air suspension have only 4 or 5 inch deflection. Super off road trucks such as concrete mixers & dumps sometimes advertise 8 inches deflection. Your BBQ rig should be okay with 2 or 3 inch deflection.
How about the grill itself? Is it charcoal fired or propane? If propane the tank must be solidly fastened to the trailer. If no permanent guard around the valve the steel cap must be installed over the valve when in travel. Also the regulator/hose must be disconnected on portable tanks over 40# capacity. It's a safety thing. You don't want a flaming rocket in case of mishap & the valve,regulator gets knocked off. Except for a few applications such as 30# tanks on forklifts, RVs, etc, the tank must be mounted to ride upright.
Ready to be flamed.

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