Disc Mower Gear Timing

Farmeroza · Aug 19, 2016

Hello folks. I searched the archives and did not find an answer to my question. I hope someone can help me. I just bought a New Holland 465 disc mower. I have read here that it is the same as a Kuhn GMD77 and a John Deere 270. All made by kuhn. I had to split the gearbox as the discs are hitting each other and one bearing I'd bad. I pulled it apart and noticed that the gears of the discs have a timing mark. Does any one know where or how to set these marks so the discs don't hit each other? Thanks yall.

farmallsforever · Aug 19, 2016

I have always timed them, 12 o'clock-6 o'clock for the first one. Then 3 o'clock-9 o'clock for the next one. Back and forth till they are all in time.

Farmeroza · Aug 19, 2016

Thanks for the response. Are you talking about the discs themselves or the gears inside the cutter gearbox. Because I'm asking about the gears inside the cutter gearbox thanks

Graham of New Zealand · Aug 20, 2016

I had a Kuhn 4 disk mower for many years and it made contact with a concrete power pole when quite new which knocked a tooth off one gear so we opened the bar up to replace it. I forget the exact business of timing the gears, but one thing we missed doing was replacing a nylon looking support or seal underneath and forever more it very slowly leaked oil from them (or at least one). So there is something for you to check out.They are certainly a great mower. Another thing, don't use B section belts on it -- they don't work! The originals are a very deep belt. And the oil is SAE 90.

Bob · Aug 20, 2016

NO rocket surgery here, each neighboring "turtle" needs to be about 90? off in position from it's nextdoor neighbor.

Graham of New Zealand · Aug 20, 2016

Another thing I did which increased the life by a long shot of the disc upper bearings which are not lubricated from the oil in the bar was to remove the disc occasionally and with a puncture wound punch you make on your grinder from a broken pick-up tine from your baler and put a very small hole in the seal. Then using a needle point on your grease gun fill the bearing with grease. Did the same with the plunger rollers on the NH 280 baler and they likewise lasted for years instead of filling up with dust and seizing.

RodinNS · Aug 20, 2016

I'm not sure on the timing marks because I've never had mine apart......... but I'd probably put the marks together. Keep in mind that the two inner discs turn the same direction (clockwise) and the rest alternate. What I'd probably do is start placing discs on the shafts to check their placement relative to the gears and go from there. On a GMD bar all discs should align parallel at about 30 degrees to forward travel. They never alternate perfectly square to forward travel with one parallel and the next perpendicular.... it just doesn't happen on that bar like it does on an FC bar.

Rod

Farmeroza · Aug 20, 2016

Thanks for the replies. Here is a picture of the inside and also a picture of the timing marks see if someone has an idea. Thanks

Disc Mower Gear Timing

Farmeroza

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farmallsforever

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Farmeroza

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Graham of New Zealand

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Bob

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Graham of New Zealand

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RodinNS

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Farmeroza

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