Does an electric hydraulic G series tractor deck have a "Float" position? - MyTractorForum.com - The Friendliest Tractor Forum and Best Place for Tractor Information
 
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post #1 of 10 Old 08-01-2019, 09:07 PM Thread Starter
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Does an electric hydraulic G series tractor deck have a "Float" position?

My new to me 16G seems to always be exerting downforce on the deck. Is this normal? Would it be correct to allow some play in the lift rod by adjusting the nuts so the rod can move when in the down position? My other G tractors have manual or transmission pump hydraulic lifts and the deck floats when lowered.

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post #2 of 10 Old 08-02-2019, 12:03 AM
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What size deck, Mikey? The 50” should only have locknuts above the pivot. The 60” has one set below and one set above. The set below could cause down pressure if not adjusted properly. You are correct, no “float” position with the electric-hydraulic pump. Only the free play from the lift rod grants you any attachment float. If we’re talking about a 60” deck, the dealer setup section of the manual illustrates the correct locknut position.

Gravely 18-G * 50" MMM * 48" Snow Blade / Gravely 816 Project * 30" Tiller * 48" Blower / Custom Trailer
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post #3 of 10 Old 08-02-2019, 12:37 AM Thread Starter
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Re: Does an electric hydraulic G series tractor deck have a "Float" position?

Quote:
Originally Posted by yamato72 View Post
What size deck, Mikey? The 50” should only have locknuts above the pivot. The 60” has one set below and one set above. The set below could cause down pressure if not adjusted properly. You are correct, no “float” position with the electric-hydraulic pump. Only the free play from the lift rod grants you any attachment float. If we’re talking about a 60” deck, the dealer setup section of the manual illustrates the correct locknut position.
Thanks, that's kinda what I deduced after looking at things. This was a county-owned machine put out for auction. 500 hours. Mechanically well maintained (cosmetics are a whole other story! ). The lift rod lock nuts are tight top and bottom. This tractor did more snow plowing than mowing, I think and I'm guessing the down force was desirable for keeping the plow digging into the snow.

It is a 50" deck. I'll try lowering the bottom set as far as I can and see what that does. I'm guessing that will fix things.

The symptom was the gauge wheels actually leaving a noticeable groove from the outside wheel in places where I have to mow a circle, like around mulch circles under tree.

Anyway, thanks! You confirmed what I was thinking.

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Gravely 16G (1994)
Gravely 16G (1991)
Gravely 48" Snowblower and Cab (for the 91 16G)
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Gravely 38" Snowblower (for the 816S)
Gravely 812 (1975)(mine since 1982)(Rolled over in 2016)
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post #4 of 10 Old 08-02-2019, 07:42 PM
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Re: Does an electric hydraulic G series tractor deck have a "Float" position?

Mikey, There are not supposed to be any nuts below the slide, on any GRAVELY deck lift.

Look at page 8 of this manual:

https://www.gravelymanuals.com/pdf/4...p_Man_0988.pdf

And the only safe way to apply down pressure even with for a snow plow is with a spring that will still allow the plow to follow the ground without lifting the tractor.





Sheldon

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post #5 of 10 Old 08-02-2019, 08:25 PM
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Re: Does an electric hydraulic G series tractor deck have a "Float" position?

Mikey,

The electric hydraulic lift does not have a float position like the engine driven lift. And if you use the electric lift with a snow blower, you need to change the ram location under the shifter plate, see this addendum:









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post #6 of 10 Old 08-03-2019, 01:35 AM Thread Starter
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Re: Does an electric hydraulic G series tractor deck have a "Float" position?

Quote:
Originally Posted by yamato72 View Post
What size deck, Mikey? The 50” should only have locknuts above the pivot. The 60” has one set below and one set above. The set below could cause down pressure if not adjusted properly. You are correct, no “float” position with the electric-hydraulic pump. Only the free play from the lift rod grants you any attachment float. If we’re talking about a 60” deck, the dealer setup section of the manual illustrates the correct locknut position.
I moved both nuts above the pivot and now have float. Thanks for your help!

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Challenge Met


Gravely 16G (1998)
Gravely 16G (1994)
Gravely 16G (1991)
Gravely 48" Snowblower and Cab (for the 91 16G)
Gravely 816S (1976)
Gravely 38" Snowblower (for the 816S)
Gravely 812 (1975)(mine since 1982)(Rolled over in 2016)
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post #7 of 10 Old 08-03-2019, 01:42 AM Thread Starter
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Re: Does an electric hydraulic G series tractor deck have a "Float" position?

Quote:
Originally Posted by ATLANTIC CENTRAL View Post
Mikey,

The electric hydraulic lift does not have a float position like the engine driven lift. And if you use the electric lift with a snow blower, you need to change the ram location under the shifter plate, see this addendum:

Sheldon
Thanks Sheldon, I think I may remove the deck to check where things are. As I said, I am pretty sure this tractor saw a lot of snow plowing. Since the lift rod was improperly connected, there is no guarantee the cylinder is properly connected

By the way, does your hydraulic motor whine? Mine does so loudly at full up and full down and less so when in motion. There is very slight hydraulic oil seepage where the reservoir joins the pump, but the reservoir is full.

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Challenge Met


Gravely 16G (1998)
Gravely 16G (1994)
Gravely 16G (1991)
Gravely 48" Snowblower and Cab (for the 91 16G)
Gravely 816S (1976)
Gravely 38" Snowblower (for the 816S)
Gravely 812 (1975)(mine since 1982)(Rolled over in 2016)
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post #8 of 10 Old 08-03-2019, 06:42 AM
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Re: Does an electric hydraulic G series tractor deck have a "Float" position?

Quote:
Originally Posted by Mikey4 View Post
By the way, does your hydraulic motor whine? Mine does so loudly at full up and full down and less so when in motion. There is very slight hydraulic oil seepage where the reservoir joins the pump, but the reservoir is full.
Makes me wonder if there's a bypass valve in the system that could use attention.
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post #9 of 10 Old 08-03-2019, 07:13 AM
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Re: Does an electric hydraulic G series tractor deck have a "Float" position?

Mikey,

Yes, the sound of the pump goes to a higher pitch whine at ether end of the travel. This is normal. Remember I bought my tractor new, so I have considerable experience with the electric hydraulic lift.

The bypass is built into the unit, the high pitch sound IS the bypass working as designed.

With age some seepage is normal, I never worry about it, it takes a LONG time for the fluid to go even a little low.

Again, going back to before the electric hydraulic system, GRAVELY intended the decks and snow dozers to float on the lift rod. The float position on the transmission driven hydraulics was intended more for ground engaging attachments like the rear tiller, which had no other way to float.

Even the snow blowers have the two piece push rod which allows them to float without the hydraulic cylinder or the rock shaft moving. With the electric hydraulic tractors it is important to always run the lift all the way down.

Given a choice, I prefer the electric system, it allow raising and lowering while the engine is off, and the science says it uses less engine hp.

Sheldon

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post #10 of 10 Old 08-04-2019, 10:43 PM Thread Starter
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Re: Does an electric hydraulic G series tractor deck have a "Float" position?

Quote:
Originally Posted by ATLANTIC CENTRAL View Post
Mikey,

Yes, the sound of the pump goes to a higher pitch whine at ether end of the travel. This is normal. Remember I bought my tractor new, so I have considerable experience with the electric hydraulic lift.

The bypass is built into the unit, the high pitch sound IS the bypass working as designed.

With age some seepage is normal, I never worry about it, it takes a LONG time for the fluid to go even a little low.

Again, going back to before the electric hydraulic system, GRAVELY intended the decks and snow dozers to float on the lift rod. The float position on the transmission driven hydraulics was intended more for ground engaging attachments like the rear tiller, which had no other way to float.

Even the snow blowers have the two piece push rod which allows them to float without the hydraulic cylinder or the rock shaft moving. With the electric hydraulic tractors it is important to always run the lift all the way down.

Given a choice, I prefer the electric system, it allow raising and lowering while the engine is off, and the science says it uses less engine hp.

Sheldon
Thanks Sheldon,

I'm kind of chuckling as I read your reply. I would probably do well to get a manual for this series of tractor! It is my first experience with the electric hydraulic. As you, I really like the ability to raise and lower attachments with the engine turned off. It is also my first experience with the Briggs Vanguard 16hp V-Twin. It seems smoother and quieter than the Kohler, which is expected, I suppose, in a more modern OHV engine. I don't have enough use to know if it is more economical - I suspect not enough so as to be meaningful.

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Challenge Met


Gravely 16G (1998)
Gravely 16G (1994)
Gravely 16G (1991)
Gravely 48" Snowblower and Cab (for the 91 16G)
Gravely 816S (1976)
Gravely 38" Snowblower (for the 816S)
Gravely 812 (1975)(mine since 1982)(Rolled over in 2016)
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