7030 hard starting, no low end power, smoke
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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=143385
Printed Date: 23 Sep 2025 at 3:17pm
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Topic: 7030 hard starting, no low end power, smoke
Posted By: GM Guy
Subject: 7030 hard starting, no low end power, smoke
Date Posted: 12 Oct 2017 at 5:28pm
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Hey all, I think the ol' injection pump is giving up on me, but I wanted to check with you guys to see what the collective thought is. My 7030 ever since I got it (this spring) has been a hard starter, but once running would seem to run fine. Now, it starts even harder, and has very little low end power, and seems to smoke more. I checked air filter, and replaced fuel filter, and blew the return line back to make sure it was not plugged, and all was well. I am about the pull the return fitting on the top of the pump and see what I can find there. Is it recommended not to knock out the glass ball? I assume there is a good chance I will find it packed full of crap? If it is packed, I assume its rebuild time? Any info appreciated, thanks! ------------- Gleaner: the properly engineered and built combine. If you need parts for your Gleaner, we are parting out A's through L2's, so we may be able to help. |
Replies:
Posted By: injpumpEd
Date Posted: 12 Oct 2017 at 6:48pm
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The DM pump does not have the failure prone flex ring which breaks down and then plugs the return. So no, don't break the ball out. Odds are one or more plungers are sticking, or the delivery valve stop is leaking, causing the low fuel delivery. It may indeed be time to get the pump properly serviced. The DM is a pretty durable pump, but even they need serviced eventually. Worse case the hydraulic head is worn out. But does it start once warmed up? ------------- 210 "too hot to farm" puller, part of the "insane pumpkin posse". Owner of Guenther Heritage Diesel, specializing in fuel injection systems on heritage era tractors. stock rebuilds to all out pullers! |
Posted By: Kevin in WA
Date Posted: 12 Oct 2017 at 9:20pm
| If it still has the fuel supply line coming the top of the tank, I would change it to draw from the bottom like the 7040 and 60, using a 1/2" hose, a restriction can cause excess smoke on a roosa pump because transfer pump pressure will drop and then the timing advance backs off. |
Posted By: GM Guy
Date Posted: 14 Oct 2017 at 12:56pm
Hi, It still has the top suction setup, and it looks to still be the original line. That could very well be part of the issue. So are the tanks the same as 7040/60 and all I need is the fittings then? It must have had a little bit of air still in the system after the filter change, after moving it around some it now seems a little more responsive. ------------- Gleaner: the properly engineered and built combine. If you need parts for your Gleaner, we are parting out A's through L2's, so we may be able to help. |
Kevin in WA wrote:Posted By: MACK
Date Posted: 14 Oct 2017 at 9:35pm
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Yes, put the bottom feed line kit on it. Will solve a lot of problems. Could regard timing a few degrees might help starting. If it has a lot of hers. On it, might be time for pump rebuild. MACK |