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Ok. I took shifter off today and dismantled pressure relief. When in neutral the hydraulic ports dump straight back to return line. When in F or R the pressure is controlled by pressure relief. I found a metal shaving or swarf in the pressure relief that would have been jamming the piston, and not releasing the pressure. I will put back on tomorrow and attempt to set the pressure around 40psi.
Pictures show internals of pressure relief including the “extra” piece.
Mark
2007 Yuchai Dozer
YTC306S-6
Yellow
Queensland AustraliaI made a new gasket for the clutch end plate with new o-rings for the oil passages. I got the motor back in with assistance from the better half. Fell in easier than I expected, must have been the offsider. Have finished putting all parts together and have installed gauge under F-N-R selector. TappedĀ 1/8 BSPT gauge into T piece from pump. Once all fluids checked and topped up, motor started and warmed up for a few minutes. I had gears in neutral, gauge was showing 10psi when in neutral and then increased to above 60psi (full scale), when either forward or reverse was selected. The pressure adjustment screw made no difference. So this had me scratching my head and I need to investigate the hydraulic selector and pressure relief a bit more, to make sure it is all clean while trying to alos understnad the porting. I took a heap more pics so let me know if there is something in particular you want to see.
Mark
2007 Yuchai Dozer
YTC306S-6
Yellow
Queensland AustraliaThe new gear compared to the old gear looks “dirty”. It looks like it has been heat treated and kind of blue/brown in colour. The intermediate geat that it meshes with also has the same finish.
2007 Yuchai Dozer
YTC306S-6
Yellow
Queensland AustraliaProgress update…I dismantled front end and removed motor, removed front cover of clutch housing and was able to access the above mentioned gear.
2007 Yuchai Dozer
YTC306S-6
Yellow
Queensland AustraliaOk, so new clutch gear has arrived. There were 2 available form the local distributor here in Australia. I’ll start next week pulling the front end apart and I have a friends small excavator to use as an engine hoist. I’ll let you know how it all goes.
Mark
2007 Yuchai Dozer
YTC306S-6
Yellow
Queensland AustraliaI drained the shuttle clutch and took the top off to have a better look. Found 2 broken gear teeth in the bottom. The come from the middle shaft front gear. Anyone able to tell me who can supply this part? 402.21H.117.
I’ll source new part, inspect inner piston and seal and install a pressure gauge to the system.
Relieved that I have found the problem, but far from having a working dozer again. š
2007 Yuchai Dozer
YTC306S-6
Yellow
Queensland AustraliaWithout pulling it apart I can’t imagine what the “servo’s” look like. I would imagine 2 geared shafts submerged in oil below the output shaft. Are you able to share any pics of the internals?
2007 Yuchai Dozer
YTC306S-6
Yellow
Queensland AustraliaThanks for the reply. A squeal was there before the knocking, but I put it down to normal as I had nothing to compare it to. I can’t say that I notice the squeal now, but the knocking is consistent when it is in forward or reverse and appears to be coming from the front of the shuttle clutch behind the engine. It started before I changed the oil. I have checked the strainer and it was clear and oil was relatively clean with minor build up on magnet plug. The oil I put in was Penrite EP 220.
It engages and drives but the knockingĀ is continuous and I won’t drive it until I fix the problem to avoid any further damage.
I will draw the hydraulic circuit to confirm that we are talking about the same type of clutch.
I have added a pic, because everyones love pics. It shows the lid top of shuttle cluth. Dipstick, breather and pressure relief return after it has passed through a cooler in front of the radiator.
2007 Yuchai Dozer
YTC306S-6
Yellow
Queensland Australia
