Kubota3710
Bronze Member
Good grief. What a great idea I should have thought of. Thanks for the help.
Kubota zerk grease fitting size
- Thread starter gwdixon
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Ken45101
Elite Member
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- Kubota M5040, M9540, B21 TLB, B2710, RTV900, JD 325 Skid steer, KX-121-3 mini excavator
If the Zerk flange is part of the seal, you might need a flat washer instead of a lock washer.
varmint
Elite Member
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- Kubota B8200, then a Kubota L3130 HST, now a Kubota L3400 HST
Tractors, made in Japan, have metric zerks. Kubota loaders, made in USA, have SAE zerks. Mostly. I also have had trouble finding the right zerk fitting for loaders.
Coyote machine
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Seems Kubota and Kioti, and possibly other manufacturers use whatever is available at the best price for their zerks. The Kioti zerks are BSP, British standard pipe, which is just another, albeit obscure, standard in thread types. 1/4, 28 is, for example 1/4 inch by 28 threads/ inch. And yes, some threads are straight, some are tapered, etc. It just depends on what is speckled by the manufacturer from what is available.
I found a zerk on the stabilizer pad pin area of my Kioti, that had been over tapped at the factory, so the zerk bottomed out on the pin and would not allow grease to pass into the recess. I removed the zerk, wrapped it with t- tape and reinserted it until it was snug but not too tight. It's done the job since the mod.:thumbsup:
I found a zerk on the stabilizer pad pin area of my Kioti, that had been over tapped at the factory, so the zerk bottomed out on the pin and would not allow grease to pass into the recess. I removed the zerk, wrapped it with t- tape and reinserted it until it was snug but not too tight. It's done the job since the mod.:thumbsup:
KYKub
Silver Member
Hi Kubota3710. I have a machine almost identical to yours, a G1900. I, too, had trouble getting the front PTO zerk to accept grease. By the way, I've never found zerks to fit the Kubota; even the "metric" ones usually have too wide a thread pitch. I've had enough from other old equipment to get by but will probably have to order a few from the dealer at some point.
Anyway, I found that the problem was the sleeve behind the zerk (inside the housing) had shifted so that the hole in it did not align with the zerk. Grease couldn't flow but it wasn't a problem with the zerk. I removed the zerk and carefully drilled a small hole through the zerk hole, in the internal sleeve and it worked like a charm. I wondered if it might shift again but so far, after using it probably half of last season, it still works fine. Just greased it last weekend.
Since you have to drill straight up, shavings going into the area shouldn't be a problem.
Good luck!
David_Kb7uns
Veteran Member
Be careful if you grind the threaded end of a zerk, there is a flange that is rolled flat to keep spring and ball in.
I have both the metric and sae zerk kits from Harbor Freight and have not found any on the tractor that have not been able to replace.
David
I have both the metric and sae zerk kits from Harbor Freight and have not found any on the tractor that have not been able to replace.
David
Kubota3710
Bronze Member
I found my problem, although it required taking the front end apart to find it. When I took the front PTO shaft out, I ended up with a handful of ball bearings and the bearing housing is stuck in the front axle support (PTO shaft goes into that). That explains the serious squeal I have been hearing. So since the bearing housing was stuck in the axle support, I took off the front axle support and found the grease hole plugged solid with crud. So I'm going to a tool shop Wednesday to see if they can get the bearing housing out of the front axle support and then I will replace it with the two new bearings I purchased at Kubota. If it can't be salvaged, I will order a new $100 support shaft.
And Kykub, based on your comments, I will relook at how I reinstall to make sure the grease hole is lined up. I thought the bolts made it impossible for them to NOT line up, but now relooking at the parts diagram, I see it is possible to screw that up.
And I did finally find a part number for the grease fitting on the front axle/knuckle arm page, which isn't intuitive when looking for the grease nipple. It is a 45 deg one, Kubota 67111-44250. Personally, I think it is just a 6 MM fitting, but will order the OEM one.
I also want to replace the roller bearings in the back of the support shaft while it is out. There doesn't seem to be a cir-clip to remove. Do those just pull out and you push the new roller bearing into place? Or is there another secret.
I won't be ignoring any more problems with grease fittings........
Thanks all. Rich
And Kykub, based on your comments, I will relook at how I reinstall to make sure the grease hole is lined up. I thought the bolts made it impossible for them to NOT line up, but now relooking at the parts diagram, I see it is possible to screw that up.
And I did finally find a part number for the grease fitting on the front axle/knuckle arm page, which isn't intuitive when looking for the grease nipple. It is a 45 deg one, Kubota 67111-44250. Personally, I think it is just a 6 MM fitting, but will order the OEM one.
I also want to replace the roller bearings in the back of the support shaft while it is out. There doesn't seem to be a cir-clip to remove. Do those just pull out and you push the new roller bearing into place? Or is there another secret.
I won't be ignoring any more problems with grease fittings........
Thanks all. Rich
During my quest to find thread size on grease fittings that might fit my L3400/loader, I end the night here with a tractor break down story. Does this front axle grease fitting break down story have a back together happy ending, yet? is there a movie about this fix up, or a couple snap shots, drawings, inquiring mines/minds like to no.............
Kubota3710
Bronze Member
Post 1 of 3 on this fix. There is a happy ending! I just got time to put it back together this morning. I learned several things that I will share that might help non-pros who fix their own stuff. First the issue was the front PTO bearings on my G1800 garden tractor had come apart. The hole on the PTO support was clogged, preventing grease from getting into the shaft area and out to the ends to the front bearing and rear roller bearing. I pulled both the PTO shaft and the front axle support, which is what the PTO shaft fits into. So here is a picture of those. I purchased a new front axle support (left item in the picture) because I wasn't sure how to get the stuck outer race of the bearing out. And there is a roller bearing inside on the the other end, which I could have probably forced out. And you can see the inner race of the bearing I cut off the PTO shaft laying next to the pto shaft. I re-used the old PTO shaft.
Kubota3710
Bronze Member
Post 2 of 3 on this fix.
My second concern was getting the correct length grease fitting because I thought if it was too long and up against the PTO shaft, that grease wouldn't go in. Since I had to special order the front axle support I also ordered the OEM Kubota grease fitting. Notice in the picture, that the shinny, new Kubota fitting has longer threads than the standard metric one I got off the shelf from the Kubota dealer. And notice the two washers in the plastic bag that came with the OEM fitting. The manual doesn't say if to use the washers or not, but I did. And since I had the PTO shaft out, I could ensure the grease fitting wasn't sticking out too far and hitting the shaft. From now on if I can't pull the old one out to ensure an off the shelf one is the same, I will order OEM. The previous owner had already replaced this grease fitting, so I wasn't sure.
Also in the pic are the new front bearing and rear rolling bearing for the PTO shaft. I also replaced oil seals not in the picture.
My second concern was getting the correct length grease fitting because I thought if it was too long and up against the PTO shaft, that grease wouldn't go in. Since I had to special order the front axle support I also ordered the OEM Kubota grease fitting. Notice in the picture, that the shinny, new Kubota fitting has longer threads than the standard metric one I got off the shelf from the Kubota dealer. And notice the two washers in the plastic bag that came with the OEM fitting. The manual doesn't say if to use the washers or not, but I did. And since I had the PTO shaft out, I could ensure the grease fitting wasn't sticking out too far and hitting the shaft. From now on if I can't pull the old one out to ensure an off the shelf one is the same, I will order OEM. The previous owner had already replaced this grease fitting, so I wasn't sure.
Also in the pic are the new front bearing and rear rolling bearing for the PTO shaft. I also replaced oil seals not in the picture.
