flatness tolerances on hydraulic pumps are really low, down in the micron range. If you can't get those pins out you're going to do more harm than good trying to lap it. run a finger across and carefully buff off any burrs that would keep the sections from seating properly. The end clearance on a gear pump is the largest driver of pump efficiency as well as durability. There is a a fine line between too much clearance and too much fluid slip across the gear faces reducing efficiency and possibly even pressure capability of the pump. Too little clearance and you can run into scuffing issues that will stick a pump or completely destroy it. Debris sensitivity comes into play here too.
I've seen gear pumps with the faces of the gear teeth worn so bad they were concave instead of convex and the lash was terrible but the end clearance hadn't worn at all and the pump still worked fine. No indication from the operator anything was wrong, pump came back to me for 20,000 tear-down inspection.
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 ]
Today's Featured Article - Box Plow Blues - by Tom Schwarz. One of the first implements most tractor owners obtain is the box plow. For very little money, this piece of equipment promises to plow and flatten any hill or vale on your ranch road or farm. At least that's what I thought! As simple as a box plow appears, it can be rather challenging to make work correctly. In our sandy soils of Florida, traction is king. You can never have wide enough tires or heavy enough weights to get all the traction you want … unless you own a monster tractor. U
... [Read Article]
Latest Ad:
Oliver 550 Diesel runs like a watch three point hitch pto engine gone threw about two hundred hours ago nice clean tractor
[More Ads]
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.