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post #16 of 28 Old 07-12-2019, 01:37 PM
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Re: Super Convertible Expectations

Its possible you could put in a swiftamatic making it a two speed axle. Assuming this is a L ground speed model. Confirm what you're doing. You can cut a sickle to any width but will have some work ahead doing it. Sickles take little torque and even a nothing left tractor will run one guess how I know. Your not looking for another mower you want the heavy duty brush blade, then move half height fender to the back. A optional chain guard is suggested for front.
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post #17 of 28 Old 07-12-2019, 02:33 PM Thread Starter
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Re: Super Convertible Expectations

The compression is low - my gauge is broken where the needle doesn't return to 0 so I don't know how accurate it is, but it moves by about 30# on each compression stroke. 30# would be about what, 2:1 compression?

I see that cylinder jugs, pistons, valves, etc are all available and it would be well within my ability to rebuild this engine, but is it worth it considering I still need to modify the mower (different blade, reconfigure guards) and find gear reduction wheels for this machine? I'm thinking not as I have a lot of other mechanical work to do this summer on farm machinery.

I guess I'll put it back on CL where found it.

Thanks all for your advice and if someone here is interested in it please let me know.
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post #18 of 28 Old 07-12-2019, 03:06 PM
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Re: Super Convertible Expectations

My personal opinion.

I would not consider the gear reduction wheels. They are a real pain to install, they throw the balance of the tractor off, and they aggravate the tractor drifting off, especially when it's first started. The clutches like to drag when the oil is cold, the reason for the pto grinding when you put it in gear with all the levers in neutral. But the tractor is heavy enough for this drag to not move the tractor. Once you put the geared wheels on, the drag has enough oomph to move the tractor. Very aggravating.

The governor is very important. I think if your engine is in good shape, then this will be the key piece to your problem. You can slow the rpms down, these engines have a lot of torque at lower rpms. And once you get in tall grass the governor will open the throttle up automatically. The governor is especially important with a sickle mower. You have to run the rpms very low with a sickle mower it tries to shake the tractor apart. The lower rpms make the sickle mower work very well, but the governor becomes even more important.

I have never had a 2 speed axle. They sound great. Even with that I would still want a governor. I have a tractor without a governor and I can't stand chasing after it once the load is removed.
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post #19 of 28 Old 07-13-2019, 03:02 PM
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Re: Super Convertible Expectations

There are other choices in the gravely model range, like 5665 and professional walk behinds, that give a better gravely experience.
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post #20 of 28 Old 07-13-2019, 03:46 PM
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Re: Super Convertible Expectations

Hello VT,

From your photos, I would guess your tractor to be from the late sixties to early seventies, there are decals on the right handlebar, but not the new style forward reverse shifter.

Take a look down on the left front side of the Advance Casting, that is the nose of the tractor without an attachment, Gravely placed serial numbers on the lower left side of the advance casting after 1968??

A Gravely in that time frame was available with four different chassis transmission choices. An eight-lead worm know as a 'C8', a six lead worm know as a 'CI, a four lead worm known as a 'CS' and a two-speed differential model know as a 'C8' The choice was to help a buyer select the best for his overall use of the machine. Unforuntanatly buyers of 'used' Gravelys do not have all the original choices... The worm gear in the chassis turns the differential which turns the axle shafts which turn...

You bought a decent looking tractor, I might guess it as a 'CI', or six lead.

Does it seem way too fast to keep up with?

Roger,

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post #21 of 28 Old 07-13-2019, 09:38 PM Thread Starter
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Re: Super Convertible Expectations

Thanks for the info on gearing beaner2u.

I took my 5 foot brush hog out on my Case 530 tractor today and did some of the areas I'd wanted to maintain with the gravely (careful driving and lots of forward/reverse required to fit). Not ideal and obviously no good for between raised beds but it will take down brush taller than me sitting on the tractor. This is what I'd hoped the gravely could do, proportional to its size. I should have done the math on this: the Case is 41 PTO hp driving a 60 inch deck, so to have similar capability the gravely would have to be 20 hp. Did they make a 20hp gravely and can the gears in the 30 inch mower take that kind of hp?

I see that the billygoat, DR, and similar brush mowers in 30 and 36 inch are around 20 hp so i guess that's what I'd need to do this. Between the raised beds never gets that bad but the other areas get these huge burdocks, honeysuckle and grape vines, and other junk that just grows like crazy.

Thanks again for the advice, I'll put that super convertible back on CL next week.

Edit: to answer the question on the machine's speed, it is a slowish but not super slow speed in low and normal if slightly fast pace in high. Maybe a few feet per second and five-ish FPS, respectively.

Last edited by vtfarmer; 07-13-2019 at 09:44 PM.
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post #22 of 28 Old 07-13-2019, 09:57 PM
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Re: Super Convertible Expectations

Get a Pro-QXT.

Sent from my SCH-I605 using Tapatalk

Thanks.

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post #23 of 28 Old 07-14-2019, 02:58 AM
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Re: Super Convertible Expectations

I've used my 52" Snapper Pro walkbehind hydro mower for clearing a couple of fields (weeds, tall grass, the odd bush). It did the job ok, just slowly because the front of the deck would fold stuff over, and then it would stay there and not get cut unless I went over it again (just some kinds of weeds). If I had to do it more regularly, I would modify the deck of another 52" hydro walkbehind I have to be more like a brush mower, as in cut open the front, extend it a bit forward and put some chains or rubber hanging down for safety, and get some brush mower blades to put on it. I like using it for stuff like this (and for plowing snow in the winter), as I have exact control of how much power each wheel gets.
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post #24 of 28 Old 07-14-2019, 07:54 AM
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Not sure exactly what your Gravely is doing , my last Gravely was an 62 LI. I have mowed down places where the mple saplings were 1/2-3/4 thick there were hundreds of them between 2 houses . Gravely made engines are torque monsters my 62 was rated at 6.6 H.P. modern 6.5 H.P. engines are between 12 -13 cubic inch displacement. Gravely engines are 29 cubic inches. It also produced the 6.6 H.P. at lower R.P.M.'s I used the 3/8ths thick blade on my brush cutter deck.
On the old 2 speed Gravelys low speed on an L was High speed on an LI low speed on an LI was high speed on an LS.
I like the 30 in brush cutter deck and am going to get one for my current Gravely when I find a quick hitch version at the price point I want. My current Gravely is a Professional 12 and was a gift. I have a kidney deck and snow blade for mine

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post #25 of 28 Old 07-14-2019, 01:24 PM
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Re: Super Convertible Expectations

The Professional 12 plumberroy mentioned has a 12 hp magnum kohler engine and with a later 106 drive 30 inch deck set up for brush it should do very well.
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post #26 of 28 Old 07-14-2019, 02:57 PM
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I have had 3-4 LI's an L8 all were beast with the brush cutter deck never could find a LS . The professional 12 I have is truly a blessing it had only been used to push snow on the roof top helipad. At this time there is no way I could have afforded such a nice machine. A oworker rescued it from being put in the dumpster. He knew it was worth $1500 give or take yet choose to give it to me because he knew how much I like Gravely walking tractors. It is one of the few things that I have that has a name. It is Esher which is blessed/happy in Hebrew

Every breath I take as a Free man was paid for with the blood of an American Soldier
From Concord and Valley Forge to the sands of Iraq
and mountians of afghanistan American soldiers have
paid the ultimate price For our Freedom.I am ever mindful
and for ever greatful for their sacrifice
My heros have always been American Soldiers
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post #27 of 28 Old 07-15-2019, 05:21 PM
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Re: Super Convertible Expectations

Any idea what year this tractor is?
The air cleaner is from a 7.6 hp unit but the head looks like an older 6.6 hp unit with the big slanted plug.
Geared wheels would work well for mowing in the conditions you are talking about. I put a set on a straight L tractor and it completely changed how it handles. Low gear with the GRWs is almost too slow. Can easily run in high gear and mow most things.
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post #28 of 28 Old 07-20-2019, 12:33 PM Thread Starter
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Re: Super Convertible Expectations

Quote:
Originally Posted by nhgravely View Post
Any idea what year this tractor is?
Not sure, I never did find a serial number on the casting and per a previous post there is no name plate on the gas tank mount.

Thanks for all the suggestions, for now I'm going to try and sell this machine but I'm not sure what (or whether) I'll buy something else. Getting cute with the tractor and brush hog plus a scythe take care of most of the areas and between the raised beds I can use a smaller machine as that's never really overgrown.

I put the machine on CL for what I paid, hopefully I get my money back out of it.
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