John Deere 4440 C3 Failure

[marcusoverholtzer]

Hi fellas, Got a 4440 in the shop that is slipping in 1,2,3,4. It is a 8 speed powershift. I used a mechanic buddies gauge pack to find low pressure in C3 planetary pack. At the moment i am pulling the cab and rockshaft cover to access the C3. Im looking for advice and tips and what to look for in theyre. Never had a Deere trans apart before but i do have 5 years experience in tractor/ truck repair. From my understanding either the clutches themselves in C3 failed or theyre is a blown seal in it somewhere? System pressures and lube pressures were good in all gears but 1,2,3,4 which were next to 0 when testing. I do have the JD service manual for this tractor. ASny help is much appreciated. Thanks

 

[WTW]

If C3 was at fault / leaking, 7th gear should also show low lube pressure?? 7th is direct drive all clutches C1, C2, and C3. When shifting to 8th C3 is shut off and B4 (overdrive) is engaged, which if C3 was truly leaking pressure would come back when in 8th gear??.

 

[marcusoverholtzer]

Pressure if i remember right diud have issues in 7th as well.

 

[tim s]

Just look it over carefully as you go apart,,it's not as bad as you think...

 

[marcusoverholtzer]

Thank you sir!