D8n 9tc02802 Will not move forwards or backwards. It has diff steer and seems to turn but not with much power. This is while stationary. Checked trans pressures all are within spec. When trying to stall converter it keeps spinning. 3rd gear forward brakes applied the driveshaft continues to spin. I’m thinking this is leading me to issues with the bull gear or clutch packs. Up to this point it would occasionally take an extra 5-10 seconds to go into gear after sitting overnight. It would also collapse the trans filter. There was definitely clutch material in the oil. Before we buy a trans I wanted to ask for input on possible other cause. There was no slipping of the trans prior to failure. Needless to say we can’t get a real account of how the machine was running prior to failure. Operator says it just stopped while backing up no noises. Laborers say 3rd gear reverse or free rolling reverse down hill then quickly going 1st forward all day… Even with clutch material visible in the oil I would think trans pressures would be drastically low if the clutch packs were spent. Our next approach is going to be removing the rear cover and looking for leaks at the priority valve but with good pressure tests I am not sure this is even worth doing… Can anyone provide any further trouble shooting before we remove the trans?
Check your p1 and p2 pressures first
P1 pressure is 360 psi spec is 365 P2 pressure is 320 psi spec is 55 less than p1 Both check out Pump pressure is 400 psi low idle.
Sounds like a deeper problem can you hear transmission engage
I’m having same issues with my D8n 9tc04555
What ended up to be the problem with yours? HeavyEquipmentForums
Sounds like the operator needs to be canned. Cowboy overdrive in reverse and dropping into first has likely exploded the planetaries in the transmission. It never ceases to amaze me anymore how many dollars a retarded operator can cost an owner. Luckily I don't seem to have these type of problems.
That operator was eventually fired. And damages from abuse have fallen dramatically across the company. It’s amazing how much one person can cost in neglect. Our issues ended up being with the driveshaft to the planetary. There are plastic spacers that ride on the cover to the planetary, those had just enough wear coupled with splines that had a slight twist from abuse to cause the axle to not engage properly.
Did you have any parts breakdown or schematics from when you did it?
Give me a call if you could I wouldn’t mind to ask you a few things about it 17804041738
We have sis. I think we pulled everything from that.
What are the symptoms and what have you done/checked so far.?
Almost sounds like the operator was intentionally trying to damage the machine. The decelerator wouldn't have helped any. Guessing he thought he thought he was the world's greatest Cat skinner? Most reckless operators do, same thing with welders. Never their fault when they screw something up.
When machines are down there is no accountability for production. But the payroll keeps going.
Perhaps if an operator is found to be seriously abusing the equipment they are run off before catastrophic failure. Another option might be that the pay stops when the machine stops. It could certainly make operators take better care of the equipment.
I agree. But we have a pre-covid world and a post-covid world...
Nobody should benefit if they are abusing equipment.
@Nige So I ended up pulling the torque and found this. Wondering what caused it and also now there’s aluminum throughout the whole system. What should I do with that
So I ended up pulling the torque and found this. Wondering what caused it and also now there’s aluminum throughout the whole system. What should I do with that
Ouch. that looks a mess. Replacement pump. Replacement cooler. All the lines will need cleaned with a sponge gun. Probably a good idea to pull the transmission and clean it all out because the small particles of aluminium will have got everywhere in the control valve. There are also a couple of orifices in that control valve that by now will more than likely be plugged up and require replacing. they can't be cleaned effectively.
What were the converter bearings like.? Worn.?
What does the stator wheel look like are the fins loose??
The bearing were fine that torque was gone through supposedly and all rebuilt 500 hours ago and the stater was fine the fins were all welded
Can you post some photos of the stator please.
Those pieces are everywhere, the hoses are next to impossible to clean out as fines often get caught where the nipple ends. Sometimes they are just tiny specs, but will still jam a spool quite easily. As Nige said previously,everything has to be disassembled. Sometimes hard to know for sure what caused the grenading. Sorry for your loss. Simon C
500 hours since rebuilt would indicate something was done wrong or missed during the rebuild. Was there warranty on the rebuild? Talking to whoever rebuilt it seems in order. Might be similar to the rebuilt engine in another thread where the cylinder head was garbage from the start.
The turbin wheel made me look because I didn't remember a insert in it. Found 3 differant part numbers for that wheel 1t0052,1t1909 and finaly 1t1993 makes me wonder what problems they were having.
The tractor was built in 1990. Converter Gp 1T-1845. Turbine wheel at that time was 1T-1909. 1T-0052 turbine was used in the former 1T-1789 Converter fitted in early 9TC-prefix D8N tractors prior to this unit being built. The update from 1T-1909 to 1T-1993 was in 1994. The size of the splined steel insert was increased in an attempt to prevent the insert loosening in the turbine wheel. See Serv Mag attached. I'd like to hear a bit more about this if you have any information.
So would I have to completely disassemble the whole transmission to clean everything out and also what would the procedure be for pulling transmission
Also you think I should completely pull apart the control valve?
Yes and Yes
See the attached procedure. It will require thw transmission and bevel gear assembly to be removed as a unit then parted into two once out of the machine. the bevel gears will need cleaning out anyway. Please don't be tempted to try to pull just the transmission. You will never mate it up to the bevel gears when you try to reinstall it. it will become clear why when you actually remove the assembly.