Posted by The tractor vet on September 03, 2020 at 17:08:08 from (104.179.81.68):
In Reply to: Re: 806 pictures posted by rustred on September 03, 2020 at 16:17:15:
Ok so you are showing around 19 PSI on the Lube circuit , and around 200 on lock up pressure and then your down of almost o . Now this is all well and good up to a point what are you reading when in the high side and the low side ?? And here is where your lacking the one reading that you can not do because you do not have a test spool that goes into and replaces one valve and you add in one more gauge . Now here is what YOU should have for lock up pressure if she was all ORG you would have about 215 on both high and low , I set 706 gassers at 235 and diesels up ten more and turned up tractors are set a 275-285 and around high pressure or 2000 -2200 , lube circuit 25 . I have never seen a MCV crack , i have seen them Blowen off the side of the tractor when someone trys to jack the pressure out of sight but never cracked . Low pressure when warm can be a weak MCV pump or weak springs in the pressure regulator valve , blowen o/ring or MCV gskt , bent baffle in the T/A blowen seal in the t/A clutch pac. . This can be checked with the removal of the MCV and doing and air pressure test on the clutch pac thru the tubes behind the MCV . at what temp of the oil does the pressure start to fall off ?? The more i see and hear it is coming down to a T/A job and a rebuild of the MCV with a new pump . along with that your going to need a New IDPTO input shaft a clutch and pressure plate and three bearing one for the IDPTO shaft and pilot and throw out bearings . Then once you get into the speed transmission it is anybodys guess , Some ya need nothing and others ya just start writing down part numbers . My 1486 was one of those , both shafts and all the gears and bearing . You mentioned that she would stop moving when warmed up well yep with a presure drop to the clutch pacs she will and you said she would set there then Bam she would hit and go . That is a classic sprag failure . As they will stop dead in there tracks and with out warning IF you don't shove the clutch down they will and do the kerbam and off to the races . When i test a tractor for a bad T/A i have found that alot of times the T;/A seams to work just fine in the bottom 4-6 gears , what i mean here is they will grab almost every time in 1-4 low range and 1-2 high range BUT when you stuff them up into 3-4 high wind her out and start dragging it down on the brakes then pull the T/A into low side be ready to kiss the steering wheel or the glass if it has a cab and have your foot on the clutch if is does stop . Here is something to try , Pull the pressure regulator spring and lightly stretch it maybe like .025 at a time di the inner spring not the outter and see how much the pressure comes up. That lies under the top plug on the back or rear of the MCV . I is under spring pressure so be ready for flying pieces , Next pull the flow divider valve and see if it is floating free in the bore.that is the one below the sending unit .
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