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Speed-Hour Meter Gear Misery

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720AL

05-29-2003 18:05:49

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My Speed-Hour meter on my 720LP never worked. It always bugged me, so I started to try and find the problem. 1st problem - drive cable broken. Replaced drive cable, but before hooking it up, I tried to spin the meter. It was frozen. Fixed that myself. Meter works on the bench. Put it all back together on the tractor and started it up. No joy. Pulled the cable off and discovered that the speed-hour driven gear has broken off its shaft. It's riding on top of its drive gear that's on the govenor drive shaft inside the govenor housing.

Problem. The gear is too big to come out the hole that the cable drive assembly screws into.

Question. Can I remove the side cover from the govenor housing, slide the govenor shaft assembly out of the housing, grab the broken gear and replace everything without removing the govenor from the tractor? I really don't want to pull the govenor housing from the tractor.

The amazing thing is that the gear hasn't fallen into the govenor gears and been ground into dust by now. I've had the tractor for several years and this has probably been like this since I got it.

Anyone had this problem?

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Bob

05-30-2003 14:17:36

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Re: Speed-Hour Meter Gear Misery in reply to 720AL, 05-29-2003 18:05:49

I replaced the drive on my 720 gas by pulling the govenor shaft out. There is a "soft" plug on the right side of the govenor housing that has to be pushed out to help guide the govenor shaft back in and you might try pulling that with a slide hammer, etc first and see if you can wiggle that drive out thru the right side before you loosen the left cover - you're only out the hole in the soft plug if it doesn't work.

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Bob K

05-30-2003 09:55:34

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Re: Speed-Hour Meter Gear Misery in reply to 720AL, 05-29-2003 18:05:49

I have the same scenario. Replaced both the tach and the cable on my 720 (both were shot!) but it still doesn't work. This post will provide good info for my notebook when I'm ready to tear into the governor. Fortunately, I have the experience of dismantling and reinstalling the governor from my 50 during restoration so I don't fear it quite as much now.

Thanks to Clooney for all his help!

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Clooney

05-30-2003 03:24:20

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Re: Speed-Hour Meter Gear Misery in reply to 720AL, 05-29-2003 18:05:49

720AL, you might be able to do what you want to do. I have pulled the governor main shaft on a 70 with the governor still on the tractor. You will probably have to pull the top governor arm to swing the fork out of the way, and/or reach in with a long screwdriver & remove the governor shaft fork screws & fork to be able to get the main shaft out [Caution: don't drop the screws down into the engine]. Keep all the L/H cover gasket(s) that come out as they are also shims that control the gear lash.

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720AL

05-30-2003 07:46:27

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Re: Re: Speed-Hour Meter Gear Misery in reply to Clooney , 05-30-2003 03:24:20

Thanks, Clooney.

This sounds scary. If it wasn't for the loose gear rattling around in there, I wouldn't do it. Although it's been doing it for a long, long time. I may get up the nerve to do it anyway.

Thanks again,
720AL

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Clooney

05-30-2003 08:46:53

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Re: Re: Re: Speed-Hour Meter Gear Misery in reply to 720AL, 05-30-2003 07:46:27

720AL, after posting what I did earlier, my brain kicked into gear & a thought came with it.
~It's possible that you won't have to pull that upper arm or fork. You probably won't get the governor main shaft all the way out, BUT, might be able to move it out, down, & sideways enough to fish that speed/hour meter drive gear out above it. It's worth a try anyhow. ~One other thing I should mention is; don't be too aggressive at pulling the L/H cover off, just let the spring kind of help push the cover out. I have had governors over the years that will have a worn L/H bearing & when the L/H governor cover is removed the balls from the L/H bearing will fall into the governor & possibly into the crankcase..

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720AL

05-30-2003 17:27:35

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Re: Re: Re: Re: Speed-Hour Meter Gear Misery in reply to Clooney , 05-30-2003 08:46:53

Hmmm, good idea about the bearings. Bob seems to have a good idea too about the soft plug on the right side.

One other scary thought - keeping the gear from falling into the engine. It's plastic and i'd never get it out with a magnet.

I'm going to tear into it as soon as I get my other tractor running. (I've got to have at least one going. You never know when or why you're going to need a tractor!) I'll let everyone know what happens when I tear into it.

Thanks guys.

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