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Ok, then that takes the direction control valve out of the equation. The next step, as your mechanic suggested, is to remove the clutch top cover and try to observe the reverse servo operation with compressed air. It should only require about 40 psig to overcome the clutch pack spring pressure to release the reverse clutch. Now it sounds like there is a restriction somewhere in the reverse servo oil passages, but that still doesn't explain the relief valve unseating, if that's what it is in fact.
It's my guess also that you also have the wrong type of oil in it. It's been a long proven fact that the lubricants shipped in the Chinese tractors (dozers included) is not to be trusted for correct type and quality. The reputable dealers will change all lubricants to domestic brands and types, and flush and treat the cooling systems as part of the pre-delivery service. The shuttle clutch should be using an AW ISO 220 Machine Oil. This oil has an AGMA rating of 5 and is recommended for geared friction drives. You can also use Caterpillar T0-4 torque fluid. You can get by temporarily using AW ISO 46 hydraulic oil. Do not use ATF, UTF, THF, engine oil, gear oil, etc. Oils are formulated for specific purposes.
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The relief valve for the shuttle clutch hydraulic circuit is attached to the direction selector (rotate) valve by U-bolts. I suggest you disassemble and thoroughly clean it (rotate valve also), and replace all the O-rings. Before you do that, make sure there is no pressure stored in the accumulator. You will have to reset the relief pressure, so accurately mark the number of turns it takes to remove the spring screw, and reassemble in reverse order.
Do you have any idea what oil was being used in the shuttle clutch?
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Just out of curiosity Tommy, do your new hoses come assembled with the banjo fittings?
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What device causes a loud hydraulic squeal? Answer: A spring loaded relief valve that is being lifted from it's seat due to system over pressure. Sounds like you have multiple issues, with one being the reverse servo.
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When the engine is running you may get a few drops of fuel from each injector. This is normal. If you don't get any fuel at all, that's ok too.
If you are showing signs of dampness at the banjo fittings it is probably because the lines have become brittle and the crimp ferrules are no longer holding. You can cut the ferrules off and replace them with mini hose clamps, or you can replace the hoses with a tight push-on type hose.
From the pictures it appears that the hoses should be replaced because they are cracking. I had this same issue on my dozer engine. Poor quality hose.
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Those are injector leak-off lines. There is hardly any fuel in them, and absolutely no pressure at all. It's a common misunderstanding to refer to them as return lines. These engines do not have unit injectors, so there is no fuel flow back to the tank.
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They are all separate short lines between the banjo fittings that can be purchased in bulk locally. Cut to fit.
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