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  1. J

    Tried ChatGPT?

    What do you think of it?
  2. J

    Aging of Sodium Hypochlorite solution

    One for the industrial chemists :) I'm told that this stuff loses its effectiveness with time and other things. At supposedly 300 g/litre of sodium hypochlorite when fresh, the specific gravity is stated in the MSDS to be 1.15 to 1.20 @ 20 degC. If it loses effectiveness, does the SG reduce...
  3. J

    KD-409 rad temp gauge... puzzled...

    Greetings, does anyone know what the point of this thang is and how it is supposed to be used? I can't find any info about it on the 'net. Thank you.
  4. J

    Whats this sewing machine thing?

    Pretty sure this fits on an older (!) type sewing machine, but does anyone know what it's called and what it was supposed to do? Embossed on it is "AMSO", "D.B.P." and stamped underneath "Made in Germany". Its about 6" wide, 1.75" high, and 4.5" long. Thanks in advance.
  5. J

    Starting a cold diesel engine on half throttle?

    Hi all Question 1 of 2: Do you think it's acceptable to start a cold diesel engine on half throttle? Its what the operator's manual recommends: (This tractor is about 40 years old, 6 cylinder 2.6 litre IDI engine) As soon as the engine fires I back off the throttle, but I still worry that...
  6. J

    Filtration and coolant webinars

    Fleetguard/Cummins is putting on some filtration and coolant webinars this month. I respect the brand (along with only a couple of others) and would attend but for the timezone difference...
  7. J

    Calling Someca K28 mower owners...

    I was given a K28 hay mower recently and from the little work I've done with it, it works well, looks mostly in original condition. It's a 4 disc 3 ph mounted job, about 5' cutting width, from the 70's. One thing I need help with: what the oil level should be in the gearbox. According to the...
  8. J

    Service bulletins, product improvement bulletins question?

    Hiyas, does anyone know what service letters or bulletins Kubota published in the late 70s - early 80s, for augmenting or correcting their WSM, and what was/were the official name/s? I noticed in a WSM for the M4500 that there are a number of hand-written edits to dimensions which must have...
  9. J

    Oily residue buildup inside intake ports

    Has anyone seen this gunk inside intake ports before and knows the cause? [images below] I was surprised when I pulled the intake manifold of my M4500 model S2600 engine (82mm stroke precombustion chamber, 6 cylinder, naturally aspirated) to find soft thick oily deposits (not hard carbon) have...
  10. J

    Testing fuel pump delivery - Bosch K type

    My S2600 WSM refers to a "Fuel tightness of pump element" test Has anyone done one of these tests of a Bosch/Diesel Kiki K type injection pump? The purpose of the test is to find out if each element of the fuel injection pump is delivering appropriate pressure to the injector line, without...
  11. J

    Advice needed on adding hydraulic circuit

    I'd like to add a bale clamp on the front end loader of my M4500DT. Currently it has one one-way valve, and one two-way valve both used for the front loader (single acting lift cylinders and double acting curl cylinder). So I need to add a two-way valve for the double acting bale clamp but I'm...
  12. J

    M4500 strengths and weaknesses

    I had a couple of conversations with a guy who came up through the ranks from mechanic and ran a small Kubota dealership last century. I was wanting to know about stuff to watch out for on my M4500DT. He had some interesting observations that I thought were worth sharing with anyone...
  13. J

    Interpreting numbers stamped on injector

    I pulled the injectors to check the head clearance, do a compression & leakdown test, and have a look at the injectors themselves. 5 of the 6 injectors are stamped "1570" and "S1", but one is stamped "1570" and "S2". Can anyone please tell me the difference if any between an S1 and an S2? Does...
  14. J

    Injector (nozzle holder nut) thread size?

    Hi, can anyone tell me the thread diameter and pitch (circled in the image below), to save me pulling one of my injectors prematurely? I need to find or make a compression test adapter to fit the injector hole in my M4500DT - the injectors (15721-53020) are same as many other models apparently...
  15. J

    Weird... S2200 injection pump on M4500DT S2600 engine?

    Help! This tractor is supposed to have a S2600 engine, and on the engine block beside the injection pump is the serial number "S2600-A-1599". So far, so good. HOWEVER the data plate on the pump itself reads "ND-PFR6M55/1 ND076" and "S2200". Also, the dipstick is embossed "S2200". Can anyone...
  16. J

    Quick question - the dreaded delivery valve holder leak - Bosch K-type injector pump

    No. 4 holder is weeping (has been for months if not years - previous owner mentioned it), and I suspect no. 3 is just starting to as well - see photo. From the numerous threads on the subject I've decided to fix it myself (it's been wonderful reading the contributions of people on this forum...
  17. J

    How to get lower link pin off M4500?

    Well I'm baffled as to how to get this plate and pin assembly off. I've undone the 3 bolts and smacked it with a special tool, levered it with a crowbar and sworn at it but it won't budge. I want to get it off so I can free up the the drawbar assembly lower pin (smaller pin visible below the...
  18. J

    Front PTO for M4500... how good is your memory?

    I wuz looking at some pics in the WSM and noticed that some of them had "F-PTO" showing on the front end and dotted lines indicating where a cutout for the PTO would be. See pix below. Does anyone know anything about the front PTO for these tractors - was it ever offered as an option, if...
  19. J

    Should I check compression/leakdown via glow plug holes or injector holes?

    Hi all - thinking of getting a compression and leakdown test on my S2600 engine so need to remove glow plugs or injectors. Question: which is less risky? Remove glow plugs, or remove injectors? (People with the same series engines - Z751 Z851 DH1101 D1301 V1501 V1701 S2200 S2800 may know the...
  20. J

    M4500 flywheel TDC timing mark

    Hi all, I'm trying to see the TDC mark on the flywheel (there must be one - it's mentioned in another post http://www.orangetractortalks.com/forums/showthread.php?t=26009&highlight=timing+S2600) but danged if I can see any mark, nor can I see any pointer to line the mark up to. I'm looking...