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Too Cautious?

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Paul

04-16-2002 07:26:45

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Maybe I'm just being overly cautious, but I posted something yesterday about changing my front pulley to accept a splined drive for a hydraulic pump. In one response, a guy was very helpful with an idea of how to lock up the motor while I torqued the front bolt on and off. A figure of 150 ft/lbs was mentioned. I'm sure the bolt might not be that tight, but how often does that front bolt just shear off after 50 years of being on there? Though everything is set up for a front mount, I would rather put a pump off to the side rather than go through trying to get a broken bolt out of the end of a crank. Am I just being stupid and there's nothing to worry about? What diameter is the bolt? Most bolts I don't care about like this, heck I've got my 6' pipe to torque 'em off with, but being wrong on this would put me out of commision for quite a while, and I've got a lot of work to do with this tractor. Thanks in advance.

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Dell (WA)

04-16-2002 09:02:49

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Re: Too Cautious? in reply to Paul, 04-16-2002 07:26:45

Paul..... ...the 5/8" OEM frontpulley ratchet head bolt is tapered under the head and is self centering on the OEM pulley. The billet replacement pulley is NOT tapered so you have to replace the ratchet bolt with a standard grade 8 5/8 NF X 1" hex head bolt with flat washer.

My Boeing designers handbook lists 5/8 NF torque grade 8 at 260 ft/lbs and grade 5 at 154 ft/lbs. The I&T FO-4 doesn't list a value that I remember.

Bottom line, 150 ft/lbs is a safe value for crankshaft front pulley bolt grade 5 or better.

Don't even think about a sidemount belt driven hydraulic pump unless you are a design engineer. There isn't room..... ....Dell

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DavidO

04-16-2002 08:27:23

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Re: Too Cautious? in reply to Paul, 04-16-2002 07:26:45

"a guy was very helpful with an idea of how to lock up the motor"

That "guy" was Dell, a very knowledgeable and experienced N owner/user. He is a "retired" engineer and knows as much about bolts/torques etc. as anyone your are likely to meet. It would be hard to go wrong following his advice.

There are pros and cons to mounting in either location. I would post specifics of how I wanted to use the tractor and get the benefit of the many years of experience on this board before making a decision.

Whatever you decide, good luck with it.

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Paul

04-16-2002 09:09:41

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Re: Re: Too Cautious? in reply to DavidO, 04-16-2002 08:27:23

Thanks guys, I only get on here about twice a year, so I don't stay up to date on the power-posters. The other reason I was thinking of mounting a pump off the side is that I was actually planning on doing some digging with the loader, and the small hyd. pump that came with the loader didn't really "look" like it was up to the task. I've got a larger, new pump to increase the capacity, but not with the integral coupler. I don't have the gpm capacity on the new one handy, and since I am still naive about sizing of hyd. systems, I might be pumping more than is practically needed - what's the downside there, blown seals on the hyd. cylinders I guess? ...I'll probably just go with the setup as bought, and attack that crank bolt with abandon. Back on the point of digging with the loader, is there a way I can plan ahead on how to "cushion" some of the shock to the mounting points on the tractor, before I mount it, to hopefully avoid destructive stresses? (I will be loosening up the ground with something first). Thanks again.

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Barnstormer

04-16-2002 10:31:56

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Re: Re: Re: Too Cautious? in reply to Paul, 04-16-2002 09:09:41

A loader is not a good digger. Once you get below about 8", you have to lower the tractor an equal or greater amount to dig again. To cut a driveway, I use my 2-14 Dearborn plow to break up the ground then use the loader to scoop dirt and move it or load it (ie loader).
If you mean to move a pile, that is different. I have found different techniques depending on the pile to be moved. Wood chips or sand, I dive in at the bottom and lift as I go forward. Some gravel this works on too. For heavier soil and clay, I use the side of the bucket to make a couple small cuts and then load or dump it where I want it.
Set-up and traction. Loaded tires or weight on the rear or wheel weights are needed! Warning! Safety First! Keep load close to the ground. On uneven ground you can find yourself catapulted up into the air with the rear tires off of the ground if a front wheel hits a rut. If the load is too high you could tip over sidewise and/or break the front axle.
I suspect that all of the above is why our good friend Del says N's wern't desinged for FELs.
Lastly, good solid mounting to the rear axle and front axle housing is the only "shock" mounting you need. If you are too rough on it, you will know immediately! Steering wheel into gut, knees into dash, steering wheel snatched out of your hands and maybe a broken thumb, sprained wrist...get the idea? This is not heavy equipment.
HTH

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John,PA

04-16-2002 07:43:37

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Re: Too Cautious? in reply to Paul, 04-16-2002 07:26:45

In my business, we are used to calculating "risk factors". In removing the crank bolt, I would calculate a risk factor of about 3, on a scale of 0 to 10, for shearing off the bolt. Last summer i removed the bolt on my 9N. It was the fir4st time since 1942 that it had been removed. No problem. Hope that this helps. :)

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Charles (TX)

04-16-2002 10:09:26

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Re: Re: Too Cautious? in reply to John,PA, 04-16-2002 07:43:37

I have to agree with John, When I removed mine, I had an open end 1 3/8" wrench and one sharp swing with a 2lb and it spun out. Charles

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