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Update per January 30, 2025. Good news. Yesterday I received the water pump 121000-42100. This time Fab Heavy Parts shipped it using Fedex which took 10 days, whereas the previous (wrong) water pump from Fab Heavy Parts was shipped using UPS which only took 4 days. Anyway, I received it...

Update per Jan 21, 2025 in the morning (in The Netherlands). I noticed a particular piece on the side of the gear housing that is different on a 3T75H-LTBS, 3T75HA, 3T75HA-F, 3T75HA-F, 3T72HA-N. In the 3T75H-LTBS service manual a simple "triangular" plate is shown, which is exactly what I see...

I found yet another site with the pump (I think) I need. This site also mentions all dimensions (photo 2 which I also attached to this reply) plus some useful info about typical causes of failure of this pump and a list of engines in which this pump is used, like (amongst many others) 3T72HL and...

True, but it was a Sunday evening and already dark, misty and freezing so it didn't feel like the perfect moment. The YB20 is outside at the moment, very close to my tools/workshop. I am concerned about fire though, so I'll clean it as soon as I can. Maybe I'll find the engine ID / serial in the...

Thanks, yes, it could very well be possible that my machine's original engine was replaced, given the fact that it has also been transformed from an excavator to a forklift. I tried to find a serial number or engine code near the starter but everything is covered in a thick layer of dust and...

I looked at the old pump. The only identification I can see is "AISIN". After Googling I found this is a Japanese part manufacturer. But I think I found the correct pump: https://mtparts.fr/winkel/japanse-tractor-parts/yanmar/water-pumps-yanmar/pompe-a-eau-yanmar-3t75/ So now I am wondering...

Well I ordered the one from FAB HEAVY. But now that I received it and tried to install it, I found out it is definitely the wrong model. Almost all mounting holes are positioned differently. It is basicallay a slightly bigger pump. Also the axle (if that's the correct English word) is longer...

I was (just now) able to purchase a 246 page English service manual for Yanmar 3T75 (H)LE series. There is about 8 pages about the cooling system and also specs for the coolant / anti freeze. I will attach the part about the cooling system to this reply.

Here is a low resolution version of the scan of the German Manual, attached to this reply. The original scan is 31 Mb so I cannot upload it here due to the upload size limitations.

Last week, you guys helped me out in finding the engine code for my old Yanmar YB20 minidigger (transformed in a tracked fork lift). I think it's a machine from the eighties. I managed to get a replacement waterpump, again thanks to the replies on this forum. Now I have to decide which coolant I...

Yes in the past I have put a large pallet (3 x 1 meter) on the forks and used it as a platform to do work at a few meters above ground level.

I have a hard copy (of not very good quality, but it is readable). I will see if I can scan it in the near future, and share it.

Wow, thanks everybody for the replies. Yesterday evening, very late, I found an old German instruction manual for the YB20 with a scheme of the hydraulic system. In the center of the scheme I saw a code 3T75H-LTBS which sounded like an engine code to me. And Bingo!! This seemed to be it. And now...

Since 1999 I own an pretty old (but extremely reliable) former Yanmar YB20 mini-excavator that had been transformed into a forklift with tracks, before I bought it. So I have only used it as an "all terrain" forklift on tracks. Has never let me down. Until yesterday, when I heard a knocking...