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HELP. The hydrostatic stopped while mowing my yard. It appears the plug or bolt had worked it’s way out of the transmission and the fluid drained out. Can anyone help with Identifying either the plug or bolt? No luck with the local mower shop and I can’t find anything on the parts diagrams listed on the internet. Model# HRC 216 HXA MAKA 1076310.

Is that hole threaded?

A mower brand would help a little too

It’s a Honda, but I’m have a bit of a problem finding the exact model.

call a honda mower dealer. FInding pictorial online for specific models tends to be a crap shoot, and honda dealers seem to be the only people who have access to all the diagrams

this is a HR216 K3 HXA which may be similar parts 37 and 39 but there is no guarantee it it the correct one. says it is 8mm. Your photo looks larger than that, I dunno. https://www.partstree.com/models/hr...sn-maka-1050001-maka-1999999/transmission-26/

It appears to have fine threads. The hole is less than 1/4 inch deep. I’ve ordered 1 plug and 1 bolt from a Honda mower dealer and both have bring wrong. They are recommending I order a new case and gasket for $130ish and replace. I thought it would be an easy part to buy. I found a video of the hydrostatic fluid being changed, but t can’t find the screw/plug that was removed.

How big is your yard? have you attempted to find the plug? i would assume it's a metal plug and magnet might pick it up...

Please give us a picture of that tag, partially show in pic #1. Second am I seeing a black ring around that plug.?

17" mini magnetic sweeper at Harbor Freight $12.99. walk around until you find an oily spot and then roll it around there. Photo looks like a steel plug

I have looked at multiple IPLs and none shows the plug listed in that area. Probably will need to have threading checks by someone with a metric tap and die set to match up the screw needed. I do find it strange that the part is not listed on the IPL.

Since I am not familiar with the Honda walk behinds it does make it a lot harder to give advice. But if you can find another HXA with the drive still in it might also help to identify the missing part.

I tried the magnet. I just started to mow the perimeter of my yard. No luck. I think it is a aluminum plug/bolt. Picture #1 is a picture I took from the video and it only showed the plug/bolt for a second. I had to rewind several times just to freeze the frame. It doesn’t show any more of the tag. Honda has so many hydrostatic transmissions. The plug/bolt is on the bottom and I haven’t found a diagram that shows the bottom. I’ve checked pictures of online sales of used Honda trans and still no one shows the bottom. I even called Honda power equipment US headquarters and they could only refer to my local Honda repair shop. The same one I purchased my mower.

Are these the part numbers for the parts which were ordered, but wrong?
Honda Bolt A, Plug #HON-90102-VD6-901
Honda O-Ring (6.8X1.9) #HON-91363-VD6-900

It appears that Honda does not provide the part separate from the case. This why I suggest getting with a Metric tap and die set to size the hole. Apparently no one thought it would get lost.

Is the following where the screw is missing? If so I see no part number or other info on it.

StarTech said:

I have looked at multiple IPLs and none shows the plug listed in that area. Probably will need to have threading checks by someone with a metric tap and die set to match up the screw needed. I do find it strange that the part is not listed on the IPL.

Since I am not familiar with the Honda walk behinds it does make it a lot harder to give advice. But if you can find another HXA with the drive still in it might also help to identify the missing part.

Click to expand...

StarTech said:

It appears that Honda does not provide the part separate from the case. This why I suggest getting with a Metric tap and die set to size the hole. Apparently no one thought it would get lost.

Is the following where the screw is missing? If so I see no part number or other info on it.

View attachment 59913

Click to expand...

Is it a screw or a non serviceable freeze plug installed at production but non intended to be removed. And a leaking like a freeze plug

ILENGINE said:

Is it a screw or a non serviceable freeze plug installed at production but non intended to be removed. And a leaking like a freeze plug

Click to expand...

Could be, just wish I had one the shop to look at. I haven't seen this the transaxle before so I in the dark here.

Oh well time to hit the wrenches here and try to beat the rain today.

If the OP could provide us with a close up picture of that opening, it would give us a better idea of what goes there. In the picture he provided I don’t see any evidence of threads, which would lead to the idea that it may be a freeze plug.

Startech - the diagram looks like my transmission and yes that’s the location of the hole. Here are a few more pictures. Part# I ordered was 91363-VD-900
90102-VD-901 91255-723-671

I did not see threads in that hole when I looked at the photo. A freeze plug would make sense with how it looks. If so and there is a warranty, that is a warranty defect.

Really can’t tell if there are threads there or not, too dark. There could be a fine thread in those shadows. Definitely can tell it is a different tranny than the one he posted from the internet in an earlier reply.

When my hydrostatic stopped I brought it into the garage and the open hole was the first thing I noticed. It appeared to be a drain plug to my transmission. Today I clean around the hole and took another picture. I’m thinking more of a plug now. To plug what? Transmission has fluid, but still will not engage.

well that is good news, the plug has not fallen out. Do leave it alone then. Time to start looking at other causes.

maybe this?

Thanks to everyone for their input.

is it honda?