D17 losing trans fluid
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=171286
Printed Date: 21 Aug 2025 at 5:26am
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Topic: D17 losing trans fluid
Posted By: Boosted6473
Subject: D17 losing trans fluid
Date Posted: 19 May 2020 at 6:09pm
| My D17 series 1 is losing the fluid from the transmission and its going into the Hydraulic side. Im well aware im going to likely have to split it but my question is where could it possibly mixing at? Would like to have the seals lined up and know which section I most likely will have to split it at before I tear into the wrong section. |
Replies:
Posted By: steve(ill)
Date Posted: 19 May 2020 at 6:30pm
|
20 years ago we had just the opposite... Rear compartment has the cylinder and hydraulic hose... hose blew and filled the transmission with hydraulic oil.. ------------- Like them all, but love the "B"s. |
Posted By: DrAllis
Date Posted: 19 May 2020 at 6:55pm
| You cannot be losing transmission/differential oil (rear most compartment) into the hydraulic system compartment (front most compartment). The only connection there is between them is the lift arm cylinder and hose and thru them the oil goes from front to back, never back to front. In between these two compartments is the middle compartment, the Power Director clutch/PTO gears. |
Posted By: Boosted6473
Date Posted: 19 May 2020 at 7:19pm
| I drained all the fluids the 1st time the other day per the manual on agcos site. Everything read perfect started the tractor and ran it for 10-15 mins and the trans was down to just above the add line and the hydraulics was blowing out the fill hole and after shutting down and sitting for a day is still reading massively overfull. Power director is staying at the full line. I will drain them again tomorrow to verifybut I cant figure out how else I would be low in one and way over in the other now and not have a ton on the ground from a leak or something perhaps im missing something? |
Posted By: steve(ill)
Date Posted: 19 May 2020 at 8:19pm
|
Boosted, the problem is the HYDRUALICS can leak into the TRANSMISSION if the rear cylinder or hose blows... But there is not a good way for the transmission to leak into the hydralulics... The transmission has no pressure to PUSH.... Are you looking at the oil cavities right ? ........... the transmission- axle is the REAR compartment. ------------- Like them all, but love the "B"s. |
Posted By: DrAllis
Date Posted: 19 May 2020 at 8:28pm
| Sitting in the seat, the transmission/differential fill/dipstick is to the immediate right of the gearshift and takes 7 gallons according to my notes. The hydraulic system is under the fuel tank on the right side and takes 2 gallons to fill. |
Posted By: Boosted6473
Date Posted: 19 May 2020 at 8:54pm
| Yea put 28Qt in the transmission/gearbox to the right of the shifter and 9.75QT under the fuel tank. I do Understand the not being able to go into the line as there's no pressure in the gear box to blow it out but didn't know if there was a seal somewhere below that could leak into the sump where the hydro pump is or something. Like thru the drive line from the engine or something. This is my 1st Allis so im not terribly familiar with their internals as I've never torn one apart to know how all the systems are broke apart but I grew up around green and red tractors and working on Diesel stuff out of my shop. I will drain them all tomorrow and make sure I didn't do something stupid and recheck the quartages but like I said when I checked them before starting the tractor all levels were reading full on the stick I did on accident fill the hydro without the lift arms down 1st since mine came without them it didn't even cross my mind perhaps that difference could massively overfill the hydro system not sure how big of a difference that makes in fluid level but perhaps that could be the issue with it being massively over full with putting in 9.75qt? |
Posted By: MACK
Date Posted: 19 May 2020 at 8:57pm
|
I would guess you have oil going from transmission to power director section. Can happen if lower transmission shaft plug comes out or PTO Seals get bad enough. Have saw enough crud get into PTO bushing to spin in housing. MACK |
Posted By: DrAllis
Date Posted: 19 May 2020 at 9:03pm
| My Owners Manual says 8 quarts for the hydraulic system. |
Posted By: Boosted6473
Date Posted: 19 May 2020 at 9:06pm
| Power director is staying at full level. The rear PTO seal looks to have been recently replaced and isn't leaking externally atleast but I could for sure see where there may be an issue there for them to have tore in before I picked it up as it looks fairly new. anyway to check the shaft plug without splitting everything? |
Posted By: DrAllis
Date Posted: 19 May 2020 at 9:08pm
| Your hydraulic is overfull !! 8 quarts not 9 3/4 quarts. |
Posted By: Boosted6473
Date Posted: 19 May 2020 at 9:14pm
 Weird the digital manual I just purchased from Agco must be wrong if your positive? Was this a common problem with their manuals? |
Posted By: DrAllis
Date Posted: 19 May 2020 at 9:19pm
| My Owners manual says 8 qts. You're the one with oil overflowing on the ground. Why don't you try 8 quarts and see how that works. |
Posted By: Boosted6473
Date Posted: 19 May 2020 at 9:23pm
| I will just weird it was reading full before hand but like I said ill drain and refill tomorrow starting with 8 qts. But was it common for the manuals to have misprints like that just curious if it is what else I will need to double check on down the road before working on to cross reference. |
Posted By: Boosted6473
Date Posted: 23 May 2020 at 12:36pm
| DrAllis you were correct about the Quartage my service manual from AGCO is incorrect guess I had better double check all specifications on this tractor and cross them on here from now on to be sure they are correct. Thanks |