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Garden Tractors Discussion Forum

John Deere 318 Hydraulics

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Ed... Va....

11-01-2006 04:50:41

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My 318 has two hydraulic control levers. The mower deck is raised and lowered by the outside lever. The inside lever is a 3 position lever that includes a float function on the valve.

I really need the float on my mower deck so I can just throw it in float and forget about having to lower the deck by holding the outside lever in the down position. (sometimes as long as four seconds).

Has anyone got any suggestion on replumbing the valve to get the float function to the mower deck?

Also, if the snow blade has a power angle, how is that function used in conjunction with the deck lever. There are 2 sets of lines running to the snow blade, I wonder how the deck linkage operates when using the power angle ports?

Thanks inadvance for your ideas.
Ed......... Buffalo Springs

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11-01-2006 06:34:46

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 Re: John Deere 318 Hydraulics in reply to Ed... Va...., 11-01-2006 04:50:41  
When you use the snow blade, you take off the deck and the linkages to the deck and then the brackets under the tractor just move when you raise and lower the snow blade. You cannot use both at the same time, so what the linkages under the tractor are doing is of no concern. A "float" postition on the hydraulic control for your mower deck would not be of any use, the mower deck alrady has a float to it due to the way the lift linkages are hooked to the deck. I really do not understand what you are looking for, once you put the mower deck in the down position when you are mowing, you should not have to change it, the deck floats in the lift linkages. All the float postion does in a hydraulic system does is to leave the hydraulic control valve in the open poisiton so the hydraulic cylinder is able to move in and out with little/no resistance. If maybe you are looking for something else, or I am not seeign what you want, post back and I will try to help, been around the older 300-400 series Deeres for about 25 years, so maybe I can answer your questions. But a 4 second delay in lowering hydraulics is a little slow, so you may have some linkages loose/worn between you control arm and the valve.

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Ed ...Va..

11-02-2006 05:30:39

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 Re: John Deere 318 Hydraulics in reply to JT, 11-01-2006 06:34:46  
Thanks JT... All those years around the 300 and 400 series... Your lucky...

What a float position on the control valve would do for me is to.. Let me throw the down lever in one quick motion to lower the deck, without having to manually hold the lever in the down position while turning and lining up the next row.

It's a minor point, but is a feature on an Ariens I had, which surprised me the Deere machine did not have on their deck control lever.

However, the float and detent is on the unused inboard lever, I think I'll just reverse the four lines on the control valve. It's really the detent portion of the float that I'm after.

The range of motion for my deck Is quicker than 4 seconds. Actually I was using a 4 count time frame to traverse from full down to full up.

Ed...Buffalo Springs

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Roger in Iowa

11-01-2006 07:02:42

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 Re: John Deere 318 Hydraulics in reply to JT, 11-01-2006 06:34:46  
When you take the deck off and want to use the two features of the blade, you have to raise the deck linkage to the highest position and adjust the depth stop to it's highest position. Otherwise you have lost motion of blade controls due to the linkage moving for the deck.

Might need to change the trans filter and fluid to speed up the deck moving. Are you doing it at full throttle or low idle?

Roger in Iowa

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Ed ...Va...

11-02-2006 05:46:20

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 Re: John Deere 318 Hydraulics in reply to Roger in Iowa, 11-01-2006 07:02:42  
I was actually counting to 4 during the full range of deck motion. The deck probably raises in 2-3 second at a lower RPM. The new tranny filter is ready for install.


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11-02-2006 05:40:33

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 Re: John Deere 318 Hydraulics in reply to Roger in Iowa, 11-01-2006 07:02:42  
Thanks Roger... It seems like the deck linkage would have to be locked down to stop that motion prior to the angle of the blade changing.

Had the same problem on a John Deere 50 farm tractor with an after market hydraulic remote line. Had to stop the 3 point hitch from moving prior to building pressure in the remote lines.


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11-01-2006 08:48:12

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 Re: John Deere 318 Hydraulics in reply to Roger in Iowa, 11-01-2006 07:02:42  
For 318's, at least within a certain serial # range, there was a "lockout valve kit" that may have been installed. When this valve is closed, the oil flow to the internal rockshaft cylinder is closed off, for operation of front-mounted equipment with the front couplings that share the rockshaft circuit.

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11-02-2006 12:42:32

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 Re: John Deere 318 Hydraulics in reply to Bob, 11-01-2006 08:48:12  
Correct me if I am wrong, but wasn't that lockout for seperating the 3 point from the rest fo the tractor when you installed a 3 point lift system on it??

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11-02-2006 14:58:15

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 Re: John Deere 318 Hydraulics in reply to JT, 11-02-2006 12:42:32  
The lockout valve on mine simply blocks the flow to one of the ports on the under-the-fenderdeck rockshaft cylinder, locking it in place, and the fluid flow is available at the front ports, WITHOUT the lost motion of the rockshaft cykinder. I don't know how others may have been set up.

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Ed... Va...

11-02-2006 05:52:06

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 Re: John Deere 318 Hydraulics in reply to Bob, 11-01-2006 08:48:12  
Thanks Bob, I was wondering how John Deere handled 3 functions on 2 control valves. That would explain it, without the benefit of a tractor manual.


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