This is a powershift trans right? 3 fwd/3 reverse?
Make sure the oil level of transmission. I am not sure whether trans level with it idling or engine off. Maybe someone else can help with that. Hill terrain can cause loss of suction. ISTR the pump is in face the of front clutch . Does this machines engine bolt directly to the transmission or does it have a drive shaft between the engine and transmission?
Quote from: mike_belben on December 20, 2018, 06:33:48 PMThis is a powershift trans right? 3 fwd/3 reverse?Yes, but its 8fwd, 4rev.Quote from: kiko on December 20, 2018, 07:51:01 PMMake sure the oil level of transmission. I am not sure whether trans level with it idling or engine off. Maybe someone else can help with that. Hill terrain can cause loss of suction. ISTR the pump is in face the of front clutch . Does this machines engine bolt directly to the transmission or does it have a drive shaft between the engine and transmission?To check the oil, let the machine idle for 5 mins, then turn off and let sit for another 5. You can then check the oil.Did you change the oil before or after the transmission issues? Did you fill the winch after changing the trans oil?
My dozer will lose drive on enough slope when oil is low, definitely start there. If its not oil level, follow your shifter linkages/cables (or solenoid wires???) to the selector valve. It should be some sort of bolt on block with atleast 2 spools. One fwd/reverse and another with detents for the gears, maybe a third for high/low range on 8spd.Somehow pump pressure has to be directed to various servo pistons inside the trans to apply and exhaust pressure to the various bands and clutch packs that give you each gear via holding or releasing different parts of a planetary. The control spools are like any valve spool, they must travel the correct amount for the spool lands to block and unblock the right passages for correct circuit pressures. Whatever mechanical components see motion mixed with dirt and oil/grease are gonna wear and get sloppy. Pull any links, pins, bellcranks or heims in the control spool chain and see if they arent half worn thru.You can probably pull floorboards and manually push/pull a spool to get a gear selected but be real careful you dont run anyone or thing over. Be prepared to shut it down fast.
Yea it's a power shift but it's six forward and three reverse
I also didn't know that I needed to fill winch after draining the fluidd. I also have a JD 450 G dozer and was wondering what kind of winches will work on it.
Does that mean you got it fixed?Six does sound more right than 8. Each planetary gives 3 speeds. a range gear or additional planetary would double it.
Quote from: Brian w on December 22, 2018, 09:20:59 AMYea it's a power shift but it's six forward and three reverseIf you only have 6 and 3 then you have found another problem. I would have a look at your shift cables and linkages.
No it's not fixed but yes it's 6 forward and 3 reverse. What has me stumped is how when it stops I can shut off the engine and wait just a few minutes and restart it and then it'll go again for awhile and it does this on both hillsides and flat land
That is usually gonna be one of two things. A sump screen is pulling up heavy sediment until it clogs, then then the trash falls off the screen when parked a while... Or..When the pump starts it sends fluid to a substantial sized empty cavity somewhere in the circuit (like a cooler or maybe your winch?) Until the sump level drops below the pickup. After shutdown that fluid drains back to the sump.Check your other dipsticks and fill plugs to see if anything is overfull. In a dozer you can be pumping trans fluid into the rear end or loosing diff oil to the final, etc.Maybe your trans has a bad output seal and is filling up the tcase or something like that? Im guessing youd have a top level plug that you could pull out then run the machine and see if its oozing out when operating.
I'm sorry it is 8 and 4 I got it confused with a old loader but my problem is still the same
Do you have an operator's manual for that machine? Read the procedure for changing the transmission oil, and let that be your guide.I have worked on a 640D, and after a transmission oil change they tell you to let the engine run for a while and then recheck the oil level, because oil is transferred into the winch. It will take several more gallons of oil before the tranny oil level stays full. Same if you drain and refill the axles, because some more oil will transfer into them before they achieve their operating oil level, although that doesn't take as much. Check your transmission oil level as the decal says on the access door, as it does drain down a bit after shutdown.Don't let me confuse you; the only place you have to check it is at the transmission dipstick, but don't panic if the oil level falls, just keep it up to the full mark. After a while it will be steady.
Quote from: kiko on December 20, 2018, 07:51:01 PMMake sure the oil level of transmission. I am not sure whether trans level with it idling or engine off. Maybe someone else can help with that. Hill terrain can cause loss of suction. ISTR the pump is in face the of front clutch . Does this machines engine bolt directly to the transmission or does it have a drive shaft between the engine and transmission?It sounds like the pick up pump could be bad. It is located in the trans on a 640. Hope this is notyour problem costs lots of $$$. Check all the pressures, that is how my mechanic found problem.