Cooling fan failure

[artc]

you can also drill that governor cross shaft and put a 1/8 roll pin to prevent any rotation in that area.

Also look at each connection from that point to the throttle plate. the pin, hole and yolk that attaches the carb rod to the governor cross shaft, the throttle plate hole and the rod, and where the cross shaft is mounted to the front cover.

I have my demonstrator tractor in the shop now (restored 8 years ago) for general maintenance and noticed a little slop in that cross shaft, which i had drilled and installed set screws in to hold it. they had worked loose. So, I'm going to change to governor to a power unit 2400 rpm, drill the cross shaft, and replace the throttle rod, all in an effort to restore eliminate slop and give the tractor some pep! 12V and Pertronics as well

the goal, as Don said, is zero slop.

[Peter Person]

OK, so I'm hijacking this thread for my own edification. I will be lubing the fan while the hood is off.
In the picture below I've tried to show what I'm describing as "freeplay". Tractor not running, hold the rod from the lever to the throttle and move front to back. Range of motion is about 3/4" at the clevis. Anything to be concerned with?
Thanks,
Peter

[BigBill]

A squirt oil can is your tractors best friend. I would lube the governor shaft bushings too. Besides a few drops on the spring holes.

Tell me how often have you greased the zerks? Be honest?

[Don McCombs]

Anything to be concerned with?

Absolutely! As you rotate that lever through it's range of movement, use your flashlight and observe what's happening at the other end of the rod.

[Peter Person]

Don,
As I recall, the governor spring does not come under tension until the freeplay is taken up leading me to believe one of two conditions exist.
1) the connection points for the governor spring have "wallered" out or,
2) the internals of the governor are worn,
3) a little of both.

What's next Dr. Don?

[Glen]

Hi,
Here is a page from the Cub owner's manual showing how to check the oil in the fan hub, if you don't know how. There's a pic, and the info is on the right of the page. Click on the pic makes it bigger.

http://www.cleancomputes.com/Cub/Cub%20 ... age-26.jpg

[offrink]

Does anyone have a photo of what the fan's oil screw looks like? Do you ever have to drain the oil or just fill it.

[Bob McCarty]

I can't find a decent photo, but it's a slotted, round head machine screw. It threads into a short stand pipe. You add oil with the fill hole up, then rotate it to the bottom to let any excess above the stand pipe drain out. There is no way to drain it for changing, the problem is when it runs out of oil.

Bob

[Bill V in Md]

quote="offrink"]Does anyone have a photo of what the fan's oil screw looks like? Do you ever have to drain the oil or just fill it.[/quote]
Here you go; Like Bob said, just a slotted round head machine screw.

[

[Dale Finch]

You add oil with the fill hole up, then rotate it to the bottom to let any excess above the stand pipe drain out

I may be wrong, but I believe you pump the oil into the hole while the screw is pointed to one side or the other. (I think the book says to the left) The only problem you would have if you did it while pointing up, is you would have more oil coming back out once you rotated the fan so the screw was at the bottom, draining off the excess.

[staninlowerAL]

Does anyone have a photo of what the fan's oil screw looks like? Do you ever have to drain the oil or just fill it.

I can't find a decent photo, but it's a slotted, round head machine screw. It threads into a short stand pipe. You add oil with the fill hole up, then rotate it to the bottom to let any excess above the stand pipe drain out. There is no way to drain it for changing, the problem is when it runs out of oil.

Bob

Here's a little photoshop work of the picture in Offrink's post.

[offrink]

Thanks for the photo! That helps a lot! I don't know the last decade mine was oiled! (To be fair I have only had it a year)

[Scrivet]

.......... I have one that was so badly worn I cut a shim from a Diet Pepsi can and put in it. When I rebuilt it the second time about 25 years later I cut a new Diet Pepsi shim and also used Permatex Bearing Mount.

Was it from the SAME diet Pepsi can????

[challenger]

I want to reinforce Artc's comment with regard to the need for zero play where the governor cross shaft fits into the hub located at the end of the short shaft that comes out of the governor body. This 'play' is a very common problem and greatly affects the responsiveness of the governor. If your tractor does not seem to respond promptly to a load being placed on the engine, check this shaft for play. As discussed, there are several ways to address the problem.

[Scrivet]

........... As discussed, there are several ways to address the problem.

My preferred way to fix it is to point towards the governor rockshaft and say "Johnny, is that supposed to move like that????" as "John *.?-!.* cub owner" walks by.