Farm Equipment - 7010 Engine Surge?

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7010 Engine Surge?

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=153020
Printed Date: 13 Aug 2025 at 5:46am
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Topic: 7010 Engine Surge?

Posted By: Roscoe62
Subject: 7010 Engine Surge?
Date Posted: 14 Aug 2018 at 3:38pm

My 7010PD (with an L-Combine Simms Injection Pump) started surging today. I am a novice with Diesel engines.

Any common issues that cause this? It is really noticeable at low to mid RPM with the tractor stopped ( no engine load)

I just replaced the fuel filter and installed a new turbo. The air filter looks ok and I cleaned it out about 10 engine hrs ago.

It does not overheat and I can see any thing out of order.

I put the turbo and new filter on at 5100 engine hours and it has 5120 hours now.

Thanks,

Roscoe.

Replies:

Posted By: Calvin Schmidt
Date Posted: 14 Aug 2018 at 5:23pm

I have a 426 On Highway Spec engine with a Simms pump in my 220. It will surge at a slow idle. Crack the throttle a little and it smooths out. I'm sure it's the governor.

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Nothing is impossible if it is properly financed

Posted By: Ron(AB)
Date Posted: 14 Aug 2018 at 7:51pm

I've got a 7000 that runs with a lope at low rpm but it has almost double the hours. So that could be expected?

At 5000 hours it should still run smooth. I would suspect the governor...check valve...fuel line...hose clamp..or any fitting in-between. Does everything look clean?

Posted By: MACK
Date Posted: 14 Aug 2018 at 9:51pm

The Simms pump on a combine would about shake the combine apart. MACK

Posted By: Roscoe62
Date Posted: 15 Aug 2018 at 4:09am

I will check all the fittings this morning. The #1 outlet fitting on the pump does look wet.

This surging is new, it just started, so this is not normal.

But most likely a pump or fuel problem, and not a turbo or air problem?

Thanks!

Roscoe.

Posted By: DougG
Date Posted: 15 Aug 2018 at 6:36pm

Get it all rebuilt ! No problems then

Posted By: SteveM C/IL
Date Posted: 15 Aug 2018 at 10:29pm

Govenors in Simms pumps are known to wear and cause issues like you describe. My 545B loader w/301 has it and surges at idle. If you ever seen the govenor you'd just shake your head.