(800) 853-2651
SHOP NOW

756D

I

Icuby

Member
I installed a rebuilt short block{310}and new gears and relief spring in oil pump. I am running 75 lbs.oil press at 2300 rpm.at opreating temp.IT manual says 35-50 lbs. What can I do to decrease the pressure? My gaskets seem to be leaking some ,thinking this may be do to to much oil pressure. I realize that this type engine can be very dirty do to oil leaks but dont like to see them on a new rebuild. Thanks
 
I am going on the assumption this oil pump is the externally mounted one normally used on a D-310 in a 756. Some applications used a internal pump with this engine. There are two styles of pressure relief valves, 756 should have late style. Just be real sure you used correct replacement spring, I am not 100 percent sure but I think the old one piece relief valve plunger used a stronger , longer spring. If you still have the old one try it and make sure the two plungers are installed correctly. Your oil pressure is way to high for that engine. Another thing on these engines. You have to be doubly sure you have correct oil filter. It needs the one with bypass valve in the filter. The filter for 400 series engines will screw right on also and it does not have bypass in it as it is in the base on those models.
 
I am going on the assumption this oil pump is the externally mounted one normally used on a D-310 in a 756. Some applications used a internal pump with this engine. There are two styles of pressure relief valves, 756 should have late style. Just be real sure you used correct replacement spring, I am not 100 percent sure but I think the old one piece relief valve plunger used a stronger , longer spring. If you still have the old one try it and make sure the two plungers are installed correctly. Your oil pressure is way to high for that engine. Another thing on these engines. You have to be doubly sure you have correct oil filter. It needs the one with bypass valve in the filter. The filter for 400 series engines will screw right on also and it does not have bypass in it as it is in the base on those models.
 
You must log in or register to reply here.

Similar threads

B
806 MCV Pressures and steering part 3
Replies
4
Views
317
Bluegill2
B
J
WD relief seat
Replies
4
Views
510
Aaron SEIA
A
D
Case 1030 Hydraulic Pressure-Question for John Saeli or others
Replies
5
Views
494
DRussell
D
R
Valve Cover Leak with New Gasket, Best Way to Fix?
2
Replies
25
Views
2K
Jim in LA
J
4
1952 Harry Ferguson TO30 - oil leak at oil filter cover
2
Replies
24
Views
1K
pomester
P
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.

Copyright © 1997-2024 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

Back
Top