Welcome! Please use the navigational links to explore our website.
PartsASAP LogoCompany Logo Auction Link (800) 853-2651

Shop Now

   Allis Chalmers Case Farmall IH Ford 8N,9N,2N Ford
   Ferguson John Deere Massey Ferguson Minn. Moline Oliver

Farmall & IHC Tractors Discussion Forum
:

IHC 986

Welcome Guest, Log in or Register
Author 
Don Anderson

11-08-2005 06:28:17




Report to Moderator

I have a 986 that is giving me problems. It is one of the last ones made and has three sets of Hydraulic outlets and the main one is set up so that it can run a hydraulic motor. Once the hydraulic oil starts to warm up a little the tractor will stop moving just like you pressed in on the clutch and the red light for the hydraulic pressure will come on. At first I thought the tractor was low on oil, but this is not the case and it has new hydraulic filters on it so I know that they are not plugged. The tractor behaves this way even when I am not pulling a load such as driving down the road with nothing attached to the drawbar. Someone suggested the multifunction valve might be sticking, but I am wondering if the dump valve might not be adjusted correctly. Any suggestions would be appreciated. Thanks.

[Log in to Reply]   [No Email]
the tractor vet

11-08-2005 19:11:54




Report to Moderator
 Re: IHC 986 in reply to Don Anderson, 11-08-2005 06:28:17  
What you have is air getting into the MCV thru the super charger line and this is causing cavatation of the MCV thus you are losing prime on the MCV pump . You can get a kit that will do away with this problem and all your problems will go away if it is not to late then it is time to dig into the PIGGY bank .



[Log in to Reply]  [No Email]
Redfan

11-08-2005 11:30:19




Report to Moderator
 Re: IHC 986 in reply to Don Anderson, 11-08-2005 06:28:17  
The 86 Series do have a supercharge line which routes uneeded oil flow from the remote valves to the MCV pump, which supplies oil for the TA, brakes, steering etc.
If the MCV pump is shot, and there is a high demand at the remotes for a hydraulic motor or likes, the MCV pump will starve for oil and there goes your steering and TA etc.
MCV pump is on the left hand side behind the cabin steps and can be tested for output by any reasonable mechanic.Regards, Redfan.

[Log in to Reply]  [No Email]
chadd

11-08-2005 09:03:29




Report to Moderator
 Re: IHC 986 in reply to Don Anderson, 11-08-2005 06:28:17  
It definitely sounds like a Torque Amplifier problem to me. Since it occurs when the oil gets warm, I would guess that somewhere a seal or valve is leaking or a pump is getting weak, because as the oil gets warmer, it also gets thinner. Does your power steering work okay? Your tractor, because it is later probably has the PFC or PPH hydraulics. I will have to take a look at a manual, but I think it still has the pump in the clutch housing for the TA, steering,and brakes. If that pump is very weak, it could display the symptoms you describe.

[Log in to Reply]  [No Email]
Don Anderson

11-08-2005 09:52:02




Report to Moderator
 Re: IHC 986 in reply to chadd, 11-08-2005 09:03:29  
I did think the brakes were a little weak now that you mention it. Where is this pump located and what kind of job would it be to replace it? Do you happen to have the factory service manual? If so would you be willing to ship it to me so that I could copy it?



[Log in to Reply]  [No Email]
chadd

11-09-2005 06:16:01




Report to Moderator
 Re: IHC 986 in reply to Don Anderson, 11-08-2005 09:52:02  
I don't have the factory service manual. I just have a cheap IT manual that can be bought just about anywhere. It covers the 74 series, 66 series, and 86 series. It would probably be easier to just buy the manual than to photocopy it. I doubt it has the detail of a factory service manual, but it only cost 10 or 15 bucks. The Multiple Control Valve is located on the right side of the tractor when sitting on the seat, just back from the clutch. It will look like a squared off panel with probably 18 or so bolts holding it on. Inside this panel are several valves, passages, o-rings, and springs to make all of the tractor functions work correctly. When this whole panel is removed, the pump will be bolted on the back of it. This is all based on a 66 series and older tractor. The 86's should be similar, but I am not sure.

[Log in to Reply]  [No Email]
[Options]  [Printer Friendly]  [Posting Help]  [Return to Forum]   [Log in to Reply]

Hop to:


TRACTOR PARTS TRACTOR MANUALS
We sell tractor parts!  We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]

Home  |  Forums


Copyright © 1997-2023 Yesterday's Tractor Co.

All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy

TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.

Yesterday's Tractors - Antique Tractor Headquarters

Website Accessibility Policy