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Afraid I can’t be of much help with the history of the Guilin dozer other than it was obviously named after the city where it was manufactured, and was purchased by Yuchai sometime in the late 90’s. I can’t say for sure if it copied the JD 310 or Komatsu D20, but there are a whole fistful of small dozers to copy from, if in fact they did.
The over-center clutch design has been around before the beginning of the bulldozer, and has history in marine transmissions that go back to the days of the original landing crafts of WW ll. Also used in PTO's.
I cannot tell you how many different ones I’ve worked on over the years, but the operating principles are the same. I can tell you that you won’t be able to adapt your shuttle clutch without significant discomfort to your body and wallet. Sorry.
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There is an inherent design flaw with this type of clutch, although it is simple in design. The clutch relies solely on the actuating cylinder to hold it engaged whereas manual types of the same clutch (the “Johnson Bar”) will have internal over-centering devices that “lock” the shifter in forward or reverse and take the load off of the thrust bearings.
You've done a great job so far.
That bearing looks like a typical ball-thrust clutch release bearing, which are designed for intermittent service and typically have a MTBF rate of around 4,000 hrs. You might want to re-address the type of oil you are using in the clutch.
I will also speculate that the hydraulic cylinder has been out of adjustment for quite awhile, and also that forward position gets used the most, particularly under load.
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Sounds like all you had was bad connections, but I'd give Tommy a shout anyway.
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That's the voltage regulator. Did you actually remove/unplug it and then run the engine?
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Here is a link to Circle-G's dozer parts.
Northern Tool is also a good known source for dozer parts.
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It's interesting to note that your clutch operating principles are exactly opposite of the newer models, where the servos in the newer models are used to separate the clutch packs against the spring pressure that keeps them engaged (much like the operating principles of the steering clutches). The problem with that system is that if the engine quits while you are in gear, you can't get it back into neutral. Hence I believe the reason for the accumulator. At least in your case you could un-link the hydraulic cylinder and disengage it manually.
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There is one other fellow with a two cylinder dozer but he hasn't been around for a long time.
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You also need to determine where that clutch cylinder is getting it's pressure from.
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Tame wrote:
I presume I have to remove the engine to dismantle the shuttle clutch, is that correct?
Correct.
One thought is that it might be just a simple adjustment to that hydraulic cylinder not travelling far enough in one direction, however I don't have that spec. Could be in your manuals somewhere.
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