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Implement Alley Discussion Forum

Re: cycle bar mower timing

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Author  [Modern View]

09-27-2013 15:42:21

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Unless it has the wrong pitman fitted you should not cut the pitman back as this will only partially fix the issue. Check the register of the mower as follows:

1. Check and set the cutter bar lead, usually " for every foot of cutter bar length.

2. Turn the flywheel until the knife is as far in as it will travel. Note the position of the knife section tips in relation to the guards. Are they centered in the guards?

3. Turn the flywheel until the knife is as far out as it will travel. Note the position of the knife section tips in relation to the guards.

You need to know from the Owner's Manual or Parts List or a reliable source the correct pitman length. You need to make sure that this length pitman is fitted. Once this is done, if the register is still incorrect, you need adjust it as per Owner's Manual. It is a great mistake to fit the correct pitman and attempt to set the register by sawing the pitman down.


a). When you alter the lead, the register will alter with it; always set the lead first.

b). The motion of the flywheel means that the pitman is not always parallel with the cutter bar in one axis of an x and y graph; therefore use the correct pitman.

Because of these factors, simply altering the length of the pitman will not set the register correctly.

Good luck,


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09-27-2013 16:25:23

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 Re: cycle bar mower timing in reply to SadFarmall, 09-27-2013 15:42:21  
I bought the pitman from the mf dealer for my #32 mower.

The register is off about the same amount when the blade is pulled back toward the mower.

I looked at the register adjustments, but they have not been moved since the machine was new 1960.

I did break the pitman once and I replaced it, so the register has been off for a while.

Will study on it some more and see if the adj is worth it. Looks like the bar is out as far as it will go.

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09-27-2013 20:38:26

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 Re: cycle bar mower timing in reply to maxwell99, 09-27-2013 16:25:23  
"Th register is off about the same amount when the
blade is pulled back toward the mower."

That sentence says it all.

You CAN'T fix what ain't broke!

If the center of the knife sections passes the guard centerline by the same amount on the "in" and "out" stroke, all is well!

Typically, the stroke of the sickle drive is a bit more that the center-to-center distance on the guards, and it is NORMAL for the center of the knife sections to pass the guard centerline on the "in" AND "out" stroke.

(BTW, it is a SICKLE mower!)

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09-28-2013 08:30:00

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 Re: cycle bar mower timing in reply to Bob, 09-27-2013 20:38:26  
Think you should follow Bobs advice, he's right on.

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