7000 maroon belly will not move and no hydraulics
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=111274
Printed Date: 14 Sep 2025 at 5:17am
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Topic: 7000 maroon belly will not move and no hydraulics
Posted By: DaveC
Subject: 7000 maroon belly will not move and no hydraulics
Date Posted: 31 Aug 2015 at 10:25am
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My 7000 has seemed to have developed a problem. I am looking for some pointers on where to start troubleshooting this. Everything was fine - used it for several hours one day, (no odd noises, etc.) parked it, shut it off. It has sat for about 5 or six days but when I fired it up and tried to raise an implement nothing happened. I noticed the 3 point arms were all the way down… and would not raise. When I put in gear and let the clutch out I get nothing. I pulled the sight plug and hydraulic oil ran out… Just wondering what may be the most likely culprit for this ailment. Any help would be appreciated. |
Replies:
Posted By: DrAllis
Date Posted: 31 Aug 2015 at 11:43am
| Loose hose clamps on the suction hose underneath the pump. Tighten both clamps. Remove one line on top of the hydraulic pump and squirt a few ounces of oil inside, reassemble, and fire up the engine quickly and get it above an idle to get things primed again. |
Posted By: Jwmac7060
Date Posted: 31 Aug 2015 at 3:10pm
| Do you have steering...almost sounds like torque limiter |
Posted By: DrAllis
Date Posted: 31 Aug 2015 at 3:21pm
| 7000'S have hydraulic pump on the engine. |
Posted By: Jwmac7060
Date Posted: 31 Aug 2015 at 3:23pm
| My bad...never had one...only 30 45 and 50...and 7580 but I don't like to talk about the last one |
Posted By: Josh Day
Date Posted: 31 Aug 2015 at 6:50pm
------------- AC's 75' 7040, 64' D-17S4, 55'WD-45, 54' WD-45, 53' WD-45, 53' WD, 52' CA, 36' WC. IH 656. Deere's 38' A, and 47' A |
Jwmac7060 wrote:Posted By: victoryallis
Date Posted: 31 Aug 2015 at 6:59pm
Best of the pack just needed the 8.3 liter motor update. ------------- 8030 and 8050MFWD, 7580, 3 6080's, 160, 7060, 175, heirloom D17, Deere 8760 |
Posted By: Jwmac7060
Date Posted: 31 Aug 2015 at 9:05pm
| 7580 was too big for the motor...I agree an 8.3 Cummins would have made it one hell of a tractor. It looked like it would pull a house down but you could pull anything it could with a stout 7060 |
Posted By: Jwmac7060
Date Posted: 31 Aug 2015 at 9:08pm
| And the 50 was a typo...got a 7060 and its still my favorite of all of them...I spent more time in that tractor than I did in high school. I've since retired her to light duty. |
Posted By: MACK
Date Posted: 31 Aug 2015 at 9:27pm
| If continues to loose prime after doing what the Dr. said, replace front seal in pump and rubber elbow under pump. If the elbow is so hard that you cannot squeeze it, replace it. MACK |
Posted By: DaveC
Date Posted: 01 Sep 2015 at 10:29am
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I unhooked the line that goes to the top rear of the pump and filled it up with oil then reattached and started tractor… got nothing. I did this a second time and then the steering started coming back, but no other hydraulics worked. This line is a flexible hose on my tractor (I think it may have originally been a solid line and has been replaced prior to me). I checked this line (goes back to the valve body on right side by rear axle) and found a couple of deep worn spots. I am going to replace it and try again. Don't know why, but it seemed to make a difference. Is this a pressurized line or a suction/feed line to the pump? I was thinking that the larger solid line that connects to the bottom of the pump is the suction side which is where I would suspect the problem should be.
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Posted By: DrAllis
Date Posted: 01 Sep 2015 at 11:18am
| HOSE UNDERNEATH IS THE SUCTION HOSE....DID YOU TIGHTEN THE HOSE CLAMPS??????????? |
Posted By: DaveC
Date Posted: 01 Sep 2015 at 11:48am
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Yes. The clamps were not loose. What would you recommend my next move be? Should I replace the elbow below the pump and the seal at the relief valve end of this tube?
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Posted By: DrAllis
Date Posted: 01 Sep 2015 at 11:50am
| That would not be a bad idea. The hose at least can get pretty spongy with age and might have a pin hole in it. |
Posted By: DrAllis
Date Posted: 01 Sep 2015 at 11:51am
| That also assumes the oil level is full. Might be time for a shaft seal on the hydraulic pump like Mack suggested. |
Posted By: DaveC
Date Posted: 01 Sep 2015 at 12:41pm
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Oil level is full. I have never had a pump off… how difficult is it to replace the shaft seal?I also had another thought… assuming there is a check valve at the bottom end of the tube that is supposed to stop the oil from going back down into the sump/pan? Have you seen that be a problem?
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Posted By: Joe(TX)
Date Posted: 03 Sep 2015 at 5:42pm
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There is not a check valve in the intake line. Another possibility is that the flow divider on the pump is stuck. ------------- 1970 190XT, 1973 200, 1962 D-19 Diesel, 1979 7010, 1957 WD45, 1950 WD, 1961 D17, Speed Patrol, D14, All crop 66 big bin, 180 diesel, 1970 170 diesel, FP80 forklift. Gleaner A |
Posted By: DaveC
Date Posted: 09 Sep 2015 at 8:04pm
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Thanks for all the input everyone… here is an update I replaced the elbow, the intake tube seal at the pan, and I replaced the filter.The good news is the steering and movement is functional again. The PTO works and the power shift is working. The bad news is that the lift arms will not raise. I haven't hooked anything to the remotes, however I suspect they will not function either. The hydraulic oil is quite foamy, which is likely due to air in the system. Is there something I should do to bleed the system or should this clear on its own? Any suggestions for what to check next?
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Posted By: DrAllis
Date Posted: 09 Sep 2015 at 8:12pm
| The lift arms will not raise unless the engine is above 1600 RPM or more. This is normal for a 7000 tractor. Continued aeration of hydraulic oil may mean a bad shaft seal on the hydraulic pump. |
Posted By: DaveC
Date Posted: 10 Sep 2015 at 1:29pm
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Sounds like replacing the shaft seal is in order. Here is additional information/observation that may or may not point to other issues: After I started the tractor I ran it up to 2000 RPM and the arms would not raise. As I watched the oil sight gauge I saw that the oil continued to look foamy. PTO would turn, etc. After driving it around the field a bit I backed up to the hay rake and tried the remotes and it did raise the rake wings (but slowly and sort of twitching). When I unhooked the couplers the oil was still foamy. The 3pt arms did finally raise (slowly and twitching). The steering was still a bit stiff at times as well. Since it was moving I decided to drive it the 8 miles back to the house (to be more convenient to work on). As I was driving down the road I noticed hydraulic oil coming up around the base of the gear shift. Not spraying but coming out at a good amount. It made it home without issue. If I leave it at a higher rpm then the oil comes up from around the gear shift and runs down the case. It doesn't seem to push oil out at lower/idle rpm. This tractor has a flexible hydraulic line running from the top of the pump to the valve body… I noticed when at high RPM this hose sort of bounces slightly like it has varying pressure. Not sure what all of this indicates, I just wanted to list my observations hoping it offers a clue as to what else I should be checking. Thanks!
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Posted By: DrAllis
Date Posted: 10 Sep 2015 at 1:57pm
| It's sucking air in somewhere. That's what the foam is coming from the gearshift boot. |
Posted By: DaveC
Date Posted: 10 Sep 2015 at 7:30pm
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I appreciate your feedback and expertise on this. Do you think that it could be the shaft seal causing it to suck air in? Also, regarding the oil coming up around the shifter. This oil doesn't appear to be foamed like it looks in the sight glass. It is just regular looking oil. Could there be pressure building up because of something in the valve body, etc. causing the oil to push up out around the shifter? I do not see how the oil level could be that high. Thanks for your thoughts. Dave
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Posted By: MACK
Date Posted: 11 Sep 2015 at 8:52am
| SHAFT seal is #1 place to suck air, #2 is rubber elbo and hose clamps. MACK |
Posted By: DaveC
Date Posted: 05 Oct 2015 at 3:21pm
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Just wanted to update… After pulling the pump off I found that the nut holding the pump shaft and gear in place was loose so I do not know how much, if any, that contributed to the problem. But I have now replaced the pump seal, the elbow and the seal/gasket at the end of the suction tube. One of these must have been an issue because it now seems to be ok. After letting the tractor sit for a couple of days the hydraulics work when it is started up. And it doesn't appear to be pushing oil out the top around the gear shift. Now on to fixing a few other ailments that I haven't taken the time to deal with over the years. Thanks for all the advice.
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Posted By: MACK
Date Posted: 05 Oct 2015 at 9:34pm
| If you are talking about the big nut ahead of pump, If I remember right, torque that nut to 600 ft. lbs. Don,t have book in front of me, but some one will correct me if my memory has slipped. MACK |