7040 powershift problems
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=171439
Printed Date: 22 Nov 2024 at 10:44pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: 7040 powershift problems
Posted By: Matthewjackson73
Subject: 7040 powershift problems
Date Posted: 24 May 2020 at 11:39am
| My 7040 will ony pull in first gear on the high side and low side and high side reverse any suggestions |
Replies:
Posted By: Leon B MO
Date Posted: 24 May 2020 at 2:57pm
|
That same thing happened to our 8050 powershift. Sounds like the nut on the end of the input shaft failed or bearing failed. We took the valve body off the right hand side of the tractor, then you can stick a bar into the transmission under the main shaft, if you have up and down play a split is the only way to fix it. Sorry about the bad news. Leon B Mo ------------- Uncle always said "Fill the back of the shovel and the front will take care of itself". |
Posted By: Matthewjackson73
Date Posted: 24 May 2020 at 3:52pm
| When that happened to yours did it do it all of the sudden it was fine all morning quit for a couple hours and came back and it was like that |
Posted By: DrAllis
Date Posted: 24 May 2020 at 6:45pm
| You say it will pull in reverse high range. There is no reason that it shouldn't be able to pull in low range if it will pull high range. That being said, if there's any oil dripping from the bellhousing, the big nut is probably loose. Removal of the right side fuel tank and then the power shift valve assembly will allow you to reach in from the side and get a long pry bar under the front clutch packs and see if you can move it up and down. You should get very little movement, like pretty near zero movement. If the nut has backed off it will obviously move. |
Posted By: Matthewjackson73
Date Posted: 24 May 2020 at 7:39pm
| Ok thanks i still dont understand why it didn't do it that morning i was using it the problem just came up after i let it sit for a few hours and came back to it any ideas |
Posted By: MACK
Date Posted: 24 May 2020 at 9:03pm
| Could have shared bolts off in clutch housing. What ever it is, it's a complete rebuild. MACK |
Posted By: DrAllis
Date Posted: 24 May 2020 at 9:10pm
| I don't think it's productive for you to question why it did what it did and when it did it. You have a problem that needs to be addressed, so figure it out or don't use the tractor any further until you do. The large nut on the front end of the transmission has a history of loosening up on its own. If that isn't it, then you must have a shift control valve problem. Either way, the shift valve and fuel tank have to be removed to diagnose the problem. |
Posted By: Matthewjackson73
Date Posted: 25 May 2020 at 8:15am
| Ok thanks for the info |
Posted By: Lynn Marshall
Date Posted: 25 May 2020 at 1:24pm
| Matt, anytime a power shift tractor is brought to me with a suspected major problem, I always put it in a position in the shop where it can be split. I don't want to put the valve body back on just to move it over to a different location after I have removed it. I even spin the rear wheels out for added room if it has that option before I take the valve body off. Expect the worst and hope for the best. |
Posted By: Matthewjackson73
Date Posted: 25 May 2020 at 7:24pm
| Good info thanks im not much of a mechanic so i was sorta hoping it be something simple like a filter plugged or something like that |
Posted By: DrAllis
Date Posted: 25 May 2020 at 7:39pm
| Is it leaking oil out of the bell housing ?? |
Posted By: Matthewjackson73
Date Posted: 26 May 2020 at 6:00pm
| No sir |
Posted By: MACK
Date Posted: 26 May 2020 at 8:49pm
| Pull valve body and lower screen cover and check for broken bolt heads in bottom. MACK |
Posted By: Guests
Date Posted: 04 Nov 2020 at 1:07pm
| I am looking for someone to fix this problem for me. I am from the UK, https://postcodefinder.net/" rel="nofollow - London webcam live . But actually, location does not matter as you can get access to my computer in a remote mode through different tools. You just need to have a few spare minutes. I would be very grateful if someone can at least diagnose the issue. Let me know if you are ready to devote some time to me. |
Posted By: Lonn
Date Posted: 05 Nov 2020 at 6:05am
------------- -- --- .... .- -- -- .- -.. / .-- .- ... / .- / -- ..- .-. -.. . .-. .. -. --. / -.-. .... .. .-.. -.. / .-. .- .--. .. ... - Wink I am a Russian Bot |
fioolsk wrote:Posted By: TCRanch
Date Posted: 25 Sep 2024 at 4:03am
| My 7040 just stopped pulling and I pulled valve body and I got 3 bolts in bottom. |
Posted By: DrAllis
Date Posted: 25 Sep 2024 at 6:05am
| Three 3/8" diameter bolts down low at the suction screen?? That is serious and will require a transmission removal and OHaul. DO YOU STILL HAVE POWER STEERING ??? |
Posted By: TCRanch
Date Posted: 29 Sep 2024 at 12:34pm
| Yes I do |
Posted By: TCRanch
Date Posted: 29 Sep 2024 at 12:35pm
| It just happened and I shut it down pulled it up to shop with pickup |
Posted By: DrAllis
Date Posted: 29 Sep 2024 at 12:50pm
| Power steering working means torque limiter on the flywheel is OK fine. Broken 3/8" diameter bolts at the suction screen is bad. 5/16" bolts at the suction screen are from the shifting valve and not nearly as serious. |
Posted By: TCRanch
Date Posted: 29 Sep 2024 at 12:54pm
| Ok where do I need to split it to get there |
Posted By: DrAllis
Date Posted: 29 Sep 2024 at 1:17pm
| This is no small task, especially for a novice. Both fuel tanks need to be removed. Split at the back of the engine (support engine with long dowel bolts thru side frames lower holes) and roll the front end ahead about 10 feet. Raise the front of the cab an inch or so and support it. Split a second time at the rear end housing and roll the 30 inch long transmission out from under the cab. Begin the tear down. Some special tools are needed. |
Posted By: TCRanch
Date Posted: 29 Sep 2024 at 4:30pm
| I have help split them in past and got a stand What are the special tools I need |
Posted By: DrAllis
Date Posted: 29 Sep 2024 at 5:35pm
| Special tooling made by OTC for Allis-Chalmers dealerships. Many I could get by without but one large diameter deep socket for the front clutch pack is kind of important, but you might be able to get by without it. Special clutch pack clips to squeeze the discs/plates/wave springs together are helpful too. |
Posted By: TCRanch
Date Posted: 29 Sep 2024 at 6:17pm
| Ok I missed that ? On size then had to find what my wife did with them 3 3/8 |
Posted By: HudCo
Date Posted: 29 Sep 2024 at 9:57pm
| just wondering ? what do these three bolts hold together , is their somthing that could be pm'd at so many hours before they broke or fell out |
Posted By: DrAllis
Date Posted: 30 Sep 2024 at 6:35am
| The broken off 3/8" bolts retain a gear to the rear clutch housing. No access until the transmission is torn down. Transmission oil changes every 1,000 hrs and inspection of the suction screen can indicate if a problem has started. Sadly, too many never get the suction screen cleaned and operate the tractor until ALL the bolts are sheared off and it quits moving. Now, the damage is massive. |
Posted By: Lynn Marshall
Date Posted: 30 Sep 2024 at 8:15am
| The most important special tool needed is a good, original service manual. It gives a detailed description of the steps to do that job. It also shows the factory special tools that are almost essential to do this. On a side note, I roll the engine and transmission assembly out from the tractor and then remove the transmission from the engine once it's clear. |
Posted By: TCRanch
Date Posted: 30 Sep 2024 at 12:14pm
| Yes sir got it and parts book learning in my old age lol |
Posted By: TCRanch
Date Posted: 30 Sep 2024 at 12:16pm
| Ok thank you I m going to fix my 200 first that old girl has only role once in20 years and it was me over tightening hydronic pump |
Posted By: HudCo
Date Posted: 30 Sep 2024 at 10:22pm
| thanks dr. lots of tractors at your shop the customer has no idea that there is a suction screen to clean |
Posted By: DrAllis
Date Posted: 01 Oct 2024 at 6:24am
| That suction screen area is where pretty much any and all debris collects from tractor operation. It is a great diagnosis tool of the overall condition of the Power Shift or Power Director transmission, good or bad. |