Thread Pitch- Kubota L4330 Transmission Oil Inlet

[stagelines]

Hello all

Is anyone familiar with the thread used on the transmission oil inlet of the Kubota L4330?

I have a Bush Hog post hole digger model # 2102, with the optional down force kit.

I am trying to plumb the downforce hydraulics to a Kubota L4330 Grand L tractor, but there is no available auxilliary inlet port as shown in the bushhog diagram, so i need to plumb into the existing oil fill.

The stock plug is plastic. I would prefer to use metal for the adapter.

i am unable to identify the threads of the fill port. i spent a few hours researching thread standards, and uncovered more than i ever wanted to know about the subject.

For example- twenty-three different exterior features of the thread ridge- per the Japanese Industrial Thread Specifications

The major diameter of the external thread (fill plug threads O.D.) is 1.272", which converts to 32.3088 mm. The thread count appears very close to 11 TPI (i only have an SAE pitch guage), which converts to 2.3091 mm. The thread is not tapered.

A few other very informative links i ran across.

Identifying Thread | Metric, Tapered, Parallel, and British Threads
THREAD IDENTIFICATION CHART
Japanese Thread Types- for Couplers

Thank you in advance for any help you could throw my way
Michael

 

[stagelines]

Hello all

I have found a solution to my problem, Inland Kubota in Yucaipa, CA located a specialized adapter just for this issue. I believe it was manufactured by Gearmore, the part number on my invoice is 10761-KC. I don't know if this part number is Inland Kubota's or the manufacturer.

It is an adapter that threads into the fill hole for the transaxle, has a port for your relief line, and allows you to use your stock plug with the vent hole. All with the oddball thread that I was never able to identify.

Inland said that this fits the early Grand L tractors, and fits up to at least my L4330.

Thanks to anyone that spent time trying to find me a solution, and I hope this helps someone else out.

 

[allenr]

Glad to see you've found such a neat solution to your problem.

I've in the past, had to resort to turning up a thread on a lathe but have never come across a thread that is so unusual in both TPI/mm per thread and in OD.

 

[Grandad4]

Well, Michael, seems like you didn't get any other responses but took the initiative in solving your problem anyhow, so good for you! You have come up with a solution I have never seen before in using the HST filler port as a return for the fluid. The Kubota hydraulics are the open-center type and there is a return port used by the loader hydraulics, etc., underneath the floorpan on the right side. Typically that port is plumbed into when adding more hydraulics. There are several threads in the Hydraulics section that cover this. But maybe your approach does the same thing.

I'd be interested to hear how the down force kit works. We have lots of hard clay soil around here that is immune to the standard PHD.

 

[stagelines]

Good morning Grandad

I haven't gotten a chance to use the downforce kit yet, I am still waiting on the rest of the plumbing, an elbow and a quick disconnect.

The only holes we have dug with this PHD have been in the soft soil on the lower part of our property, so soft this time of year from the spring water that it cut through like butter even without downforce.

Up above is a different story however. We bored about forty holes using a bobcat with a hydraulic PHD. Installing a solar array, raised off the ground so we could use it as storage underneath. The holes had to be deep because of the height of the structure. The ground there is full of rocks, we muscled through on a lot of the holes but eventually had to bring in a backhoe and dig a trench for part of the project. Without the downforce on that unit we wouldn't have made any progress with the PHD at all.

I'd be interested to hear how the down force kit works. We have lots of hard clay soil around here that is immune to the standard PHD.

 

[Grandad4]

Best of luck with your project. That pic certainly does not look like the typical So Cal environment... you must be somewhere around 7,000 ft., I guess, and hopefully away from all the LA congestion. We lived in the Ventura area and then, briefly, in Orange County, but that was almost 30 years ago, and we thought it was too crowded at that time!

 

[stagelines]

Absolutely right, we are in the San Bernardino Mountains, at 6750 ft.

We completed the actual solar arrays back in 2003, they have made most all of our electricity since. I am slowly completing the rest of the project, pouring a cement floor underneath the array structures, enclosing the underneath with T1-11, and adding shelving. I used Uni-strut for my T1-11 and for shelf support, as you can see in the photo. Certainly sturdy enough for anything that I will be putting on it.

I will be enclosing 3 sides of each array, the front like you see, and both ends. Each array structure is ~40 feet long. On the back side of each array, I will position a 40' cargo container, 9 feet back. I will add a carport type roof between the arrays and the containers, again using 10' Uni-strut sections as the framework. Plans include a garage door on one end, and a walk in on the other. Electricity is already in place at each array, a standard Murray sub panel is part of the solar power system. I just need to run my final circuits.

Final area under roof for the project- ~1960 square feet. 640 sf within the cargo containers, 720 sf under the carports, and about 600 sf under the arrays themselves.

Best of luck with your project. That pic certainly does not look like the typical So Cal environment... you must be somewhere around 7,000 ft., I guess, and hopefully away from all the LA congestion. We lived in the Ventura area and then, briefly, in Orange County, but that was almost 30 years ago, and we thought it was too crowded at that time!