Can't identify part that fell off tractor.

[whitetiger]

The cap in the parts picture is only used if you do not have a mid PTO shaft. It is used to fill the hole, is metal coated with rubber and does not have a hole in it.
I have serviced and repaired several B7800s and do not recall seeing that cap.

 

[Ryansweatt2004]

Could it possibly be from the steering knuckles? Just a thought.

 

[CobraTom]

I don't think so but that's because it doesn't really look like the drawing. It looks less like the cap over the end of a new tube of grease and more like a flying saucer. However, I went out and looked anyway and I can't find that part of the mechanics on the tractor. I can find the two PTO controls where the levers that engage and disengage the PTO(s) are attached but I didn't see anything that looked exactly like that mid-PTO assembly.

Could you tell me exactly where to look? The I'll know for sure because sometimes those drawings are more representational than they are realistic.

Underneath the tractor.

Other option is if its a cover for the springs underneath the seat. (Seat cushion springs)

 

[NEPA Guy]

Thats the cap from the Johnson Rod. Any mechanic worth his spit knows that.

 

[lugbolt]

I think it's a vent cap. But I can't remember where I saw it. CRS syndrome kicking in again.

 

[Frostbyte]

Thats the cap from the Johnson Rod. Any mechanic worth his spit knows that.

Nah, it's the squidger flange cover for the canooter valve, I just can't find the canooter valve so that I can put it back ...

 

[Frostbyte]

The cap in the parts picture is only used if you do not have a mid PTO shaft. It is used to fill the hole, is metal coated with rubber and does not have a hole in it.
I have serviced and repaired several B7800s and do not recall seeing that cap.

Then it's not this thing, I have a mid-pto shaft for a belly attachment and that is easy to find so I guess we can rule that out. That also explains why I couldn't see something that looks exactly like that drawing, there's a splined PTO shaft sticking out of the one I have.

Thank for trying though, the effort is appreciated.

 

[Frostbyte]

I don't know if this will help any but ...

I was mowing with a finish mower rear deck and I went through a swale, a very shallow ditch. I thought I had enough clearance but I didn't and I grounded the blades which also lifted the deck against the three point hitch. There was a high pitched squeal, the mower blades stopped, the drive belt came off the deck and the back pressure on the PTO (or maybe the three point) blew hydraulic fluid up and out of the dipstick hole (obviously dislodging the dipstick too) which is aft and above the reverse HSD pedal.

I was finished anyway so I put the belt back on and parked the tractor after snugging up and rechecking the three point. I worked on the three point where I park the tractor, the tools are nearby. I tightened it back up and drove it around to make sure it was tight and didn't wobble or wiggle. Then I backed in to park in the normal spot again

This thing was laying under the tractor with the side that has the concentric rings (see pic) up and it was full of hydraulic fluid. I noticed it immediately when I climbed down, it's big enough to be real obvious. It's also big enough that I'm certain it wasn't there as I backed in because it would have been impossible to miss seeing it.

There's no chance at all that this is off the mower deck. 90wt gear grease doesn't look or smell like hydraulic fluid and besides plain old grease that's the only lubrication on the deck. There's no where for this to have come off the deck. It's pretty simple; a drive gearbox, a drive pully, idlers, spindles and blades ...

Something, either the PTO being forcibly halted or lifting force against the three point, generated enough pressure to blow a little fluid out of the dipstick hole and very likely that is what blew this cap off too. Then the cap had to have ridden around on the frame or hung up somewhere only to fall off just as I parked the tractor.

 

[NEPA Guy]

Nah, it's the squidger flange cover for the canooter valve, I just can't find the canooter valve so that I can put it back ...

lmao!

 

[G.rid]

Every piece of the puzzle helps! A rubber cap shouldn't vibrate loose, so the pressure thing makes sense.
If there was enough pressure to force out the dipstick and oil, then I definitely agree it sounds like a vent cap. Vents are usually at the highest point, so chances are it's under the floor pan under the seat. Not sure how hard it is to remove on your tractor. Have you tried looking near the top of the rear axle assembly with a long reach mirror? Everything up there should be a layer of dust and dirt, except where that cap came from.

Good luck

 

[Tooljunkie]

If it came off and is a vent of sorts,the size of it indicates a large hole that needs to be covered. So returning it to its original home is somewhat important. I wouldnt want to be getting dirt into whatever it was protecting. Mirror works. I use my iphone and set it on video to look around corners. Like trying to find leak on the back of an engine block.

If it smells like gear oil and was covered in it, then it should narrow it down i would think

 

[jpf]

I sure don't want to miss the end of this show!

 

[Loner16]

I've had my B-7800 for ten years and been all over it ... That cap looks completely unfamiliar to be.

But, I hope you get it figured out!

 

[jnschnit]

How about the plug on the side of the clutch housing? Item 100 in the clutch parts diagram p/n 37410-13124 ?

 

[100 td]

How about the plug on the side of the clutch housing? Item 100 in the clutch parts diagram p/n 37410-13124 ?

That was mentioned in the first reply

 

[kuboman]

Is the plug in the fill hole for the transmission. On the top at the back of housing?

 

[kuboman]

Any update?

 

[Frostbyte]

Any update?

Nope, nothing yet Kuboman.

The size and (relative) intricacy of the cap would tend to argue that it has some sort of important function. I'd think it would be important enough to have a part number and be on a parts diagram somewhere. So far no one has been able to solve the puzzle, though it's not like quite a few haven't given it a very good try.

At this point I'm also thinking that there's probably a lot more tractors out there than just mine that have this cap missing too. Because it was just the sheerest happenstance that it fell off where it would be noticed. Had it fallen where it most likely was dislodged while doing work I would never have seen it nor had I seen it's unlikely I'd have thought it was off the tractor. The place I found it under the circumstances I found it left no doubt it had come from the tractor.

So it is quite likely that other people are missing this part too, and that they just don't know it yet.

 

[Frostbyte]

Is the plug in the fill hole for the transmission. On the top at the back of housing?

Yup, it's that hard plastic (or whatever it's made of) knob looking plug you have to pry out to fill the transmission/differential with fluid and it's in there where it belongs.

Whatever caused the over-pressure wasn't enough to dislodge that. I don't think the over-pressure was very serious, it's just that the tractor was coming up out of the swale while the mower deck was still going down into it. Which made it look like this V not like this __, but no where near that steep.

 

[G.rid]

Just for kicks.

Try walking in to a dealer and show the cap to the greasiest mechanic in the service department!