(800) 853-2651
SHOP NOW

MF 135 reving up

G

Greg in KY

Member
I think this was discussed a little while back but I cannot find it.

135 diesel- 1st time I had used it, unknown history- seems to be in good condition.
I had been using it with a sickle bar mower for 2-3 hours. Everything working as it should. Then the motor would rev up about 250 rpms(from about 1500 to 1750) for maybe 2 second up to about 10 seconds then go back to the 1500 rpms. It did this maybe 10 times in about 15 min.

The throttle lever never moved. I do not believe the throttle linkage moved on the pump. I may have been only while going up hill but not for sure. I could not make it do it again.

Then it ran normally for about an hour more until I quit using it.

What going on?

Thanks, Greg
 
Possible fuel starvation,clean or replace every filter right back to
the gauze in the tank. If you are happy with the fuel flow then
unfortunately you may have a worn cam ring in the fuel pump. this
is specialist repair only.
Sam
 
Sounds like the fuel system is sucking air somewhere, or, as mentioned, starving for fuel. I've had a couple Perkins diesels do EXACTLY like what you're describing. In BOTH instances, the primary lift pump (fuel pump before filters) was in the process of going out. Both were repaired by replacing diaphragms in the lift pump.
 
I really appreciate the responses and will certainly take them into consideration.

My (sometimes ridiculous) reasoning would be that if it was fuel starvation or sucking air then the rpms would not hold extremely steady for hours and also that it would drop rpms rather than increase rpms.

Other than the 15 minutes described above- this tractor has run really smooth the few hours I have used it. It also seems to have more power than a couple of the other 135 diesels I have.

I am sure y'all know more about it than I do.

Thanks, Greg
 
As I said, I've had 'em to do EXACTLY as you described when the lift pump diaphragm was leaking and allowing SOME air into the system. EXACTLY as you described......
 

I believe I have an extra pump. That will be the first thing I change if/when it happens again.

I appreciate the help.

Thanks, Greg
 
You must log in or register to reply here.

Similar threads

W
1720 Hand throttle
Replies
4
Views
159
White Mountains NH
W
K
MF 265 3ph not raising
Replies
5
Views
228
keljan11
K
C
MF20 Industrial - PTO Slipping
Replies
5
Views
371
Clarkbug
C
C
MF 65 water pump pulley slipping on shaft
Replies
1
Views
211
Jim.ME
J
J
135 Clutch parts
2
Replies
29
Views
15K
MasseyMike
M
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