(800) 853-2651
SHOP NOW

1949 JD MC Hyd. pump

R

R Geiger

Well-known Member
A couple of daays ago I was doing some work with my MC, the blade starting acting light the fluid level was low, so I headed for the shop. Shut her down and waited an hour or so, went out and check for hyd fluid and it was eal low. Checked engine oil and it was real high. It was on full before I fired it up earlier.
I figured the seal in the pump was bad so I proceded to remove the pump.. That is getting more difficult as the years go by..

Upon pump removal, it appears that the either the seal backed out a bit or the cam shaft moved forward a bit. The spline adapter had been rubbing on the seal causing damage. The pump was rebuilt about 6 years ago. I think the seal was seated correctly.

Question: has anyone had the seal move or can the cam move forward and should I be able to check for that?

I am waiting for parts now so wanted to ask for advice.

thanks.
 
I have rebuilt a lot of hydraulic pumps in my time including gear, piston, and vane pumps and I have yet to see one that permits the shaft to float. I don't know what type of pump you are dealing with but I suspect you have some bad bearings and or a worn housing. The pump on my JD 40 is a gear pump.
 
I would suspect that it is very similar to a 40 pump. if not the same one. I don't think the shaft is moving, it can't really unless the housing is really worn bad. the drive shaft drives from the adapter that is bolted to the front of the cam and the shaft just floats in the splines. The only thing that really makes sense to me is if the seal moved or was not seated all the way when it was installed.
 
My guess is the bearing was seated flush causing excessive pressure. Here's the service bulletin.
a223133.jpg
 

Thanks, this may very well explain my problem. My system was home made for a belt driven pump by a previous owner and I installed the pump. I do not know what pressures It is building and do not know IF there is any pressure by pass valve installed. It is time to re engineer it.
thanks
 
You must log in or register to reply here.

Similar threads

W
JD 45 combine fuel pump won't prime.
Replies
7
Views
370
Jim.ME
J
M
John Deere 1070 leaking hydraulic fluid into crankcase
Replies
4
Views
258
MIKEBRONK
M
M
1520 won't hold constant RPM, injection pump?
Replies
3
Views
330
MaxCollins
M
W
JD 1020 Power Steering Pump...Again
Replies
15
Views
671
WangoTango
W
W
Case 1490 water pump pulley
Replies
4
Views
233
Wetherdad
W
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