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So now we know. Thanks for all your help Bob. It's a wet season job so I won't be getting into it until early next year. Too much work to do on the farm at present. By then the dozer will be about due for a dulux overhaul. It has to root rake all the country the excavator cleared before it gets any love care and attention.
Dozer YCT306S shuttle shift - root rake, tree-pusher, backhoe
Excavator Hyundai 17 tonQLD, Australia
Ok now that the excavator is back on the flat where it belongs I had a chance this afternoon to remove the cover plate and presurize the shuttle clutch. Forward disks engage with minimal air leakage. The reverse pack engages also but a loud gurgling noise indicates a lot of air escaping under the oil.
Dozer YCT306S shuttle shift - root rake, tree-pusher, backhoe
Excavator Hyundai 17 tonQLD, Australia
Dunno. Tried everything, even assigned my wife to the problem. When I click the link just takes me to the facebook login page. I will have to go and seek help from a six year old kid. Feeling very left out and disapointed now! lol.
Dozer YCT306S shuttle shift - root rake, tree-pusher, backhoe
Excavator Hyundai 17 tonQLD, Australia
Nope, whatever search I try for yuchaidozer or yuchai guilin comes up “No results found” …..strange.
Dozer YCT306S shuttle shift - root rake, tree-pusher, backhoe
Excavator Hyundai 17 tonQLD, Australia
Yes probably wrong gauge. Could be the tracks and sprockets are made by different factories or just something silly going on in China. Wonder if anyone else has the same issue?
Can't access your link Bob, even asked my wife to try cause she is on facebook all the time, no luck. Can you check it out? Cheers.
Dozer YCT306S shuttle shift - root rake, tree-pusher, backhoe
Excavator Hyundai 17 tonQLD, Australia
Actually I noticed this since new so it isn't wear related, besides my 16 ton digger tracks are nearly due for replacement and no problems with them at all despite it being regularly sideways on hill slopes. I've lost tracks off the dozer even on flat ground and all I could find as a cause was a tree root I had driven over.
What drew my attention to it was the noise coming out of the tracks. They were banging a lot on the sprockets. Adjustment was according to the manual. You could watch the links slipping on the spockets as they tried to seat alternating from slack to tight all the time. I was hoping they might wear in but 380 hours later there is certainly no improvement. Maybe the designer thought they would get more life out of the sprockets by riding them high.
Looking at existing wear on the links I think I will be lucky to get another 300 hours out of them. Very curious about your rubber tracks Bob. I thought they might suit my terrain better because my steels are always losing grip on rocks and tree roots however a dealer in Australia told me they are terrible and fall off all the time. How are yours lasting for wear and have you fitted track guards?
Dozer YCT306S shuttle shift - root rake, tree-pusher, backhoe
Excavator Hyundai 17 tonQLD, Australia
When I lost my trunion bush a couple years ago I simply drilled a hole through the housing and tapped it out for a grub screw. Machined up a spare bush bush while I was at it. Welding a bush into a housing should be the absolute last resort. Don't know why anyone would do it unless they were stuck in a remote region with limited tooling and time was of the essence. Rough and unprofessional also creates a headache for the next guy who needs to change out the bush.
Dozer YCT306S shuttle shift - root rake, tree-pusher, backhoe
Excavator Hyundai 17 tonQLD, Australia
Thanks for the info Bob. I probably won't be able to give the dozer much attention until next week as I have a 16 ton excavator on it's side about 30m down a jungle covered hill. Another digger arrives tomorrow to get some stumps out of the way and make a pad so I can use rigging gear to pull it back over. Fun and games!
Why do you say a restriction in the reverse servo passages wouldn't cause the relief valve to unseat?
Dozer YCT306S shuttle shift - root rake, tree-pusher, backhoe
Excavator Hyundai 17 tonQLD, Australia
Bob, your suggestion gave me an idea; a temporary swap on the forward/reverse hoses at the rotating valve to determine if the problem was at direction control or inside the transmission. After doing so and running the dozer I still had the same symptoms when travelling in reverse (with the direction control lever at forward position). This was to be expected as I have previously dismantled the rotating valve looking for issues but found none. I haven't touched the PRV but since the machine works fine in forward I can't see any reason to mess with it.
Oil is whatever the manufacturer filled it with. I don't see anything in my logbook to indicate it has ever been changed and the service interval is 1000 hrs anyhow. All I did to the shuttle system was open the drain to check for contamination and install an external filter but the problem was current long before that.
Dozer YCT306S shuttle shift - root rake, tree-pusher, backhoe
Excavator Hyundai 17 tonQLD, Australia
Ooh, very interesting Bob. That's what I needed to hear. Would you please go into detail on steps you would take to investigate the problem? My hydraulic trouble shooting skills are very limited, not much experience in that field. Multiple issues….. hope not!
Cheers.
Dozer YCT306S shuttle shift - root rake, tree-pusher, backhoe
Excavator Hyundai 17 tonQLD, Australia
