(800) 853-2651
SHOP NOW

cub tractor

R

richardjones

New User
im having a problem with my farmall cub tractor.i replaced the oil pump an primed it.it is still not pumping oil,an I have no oil pressher. has any one had this problem? an how do I go about fixing the problem.
 
Have you pulled the oil pressure gauge off and made sure it isn't the gauge as in spin it over with out the gauge on and see if you get oil out of the hole it screws into
 
Years ago, friend replaced his Cub engine with a rebuilt from Central Tractor. No oil pressure, he took it back and they gave him another one. Same problem, no oil pressure. He asked me to take a look, found that he just used some rather thick gasket material for oil pump, replaced gasket, and it was good to go. Don't remember but should be in manual how to set up pump if this is your problem.
 
Not familiar with your particular engine, but sounds like it has lost it's prime.

Looking at pictures of the pump, appears the gasket sets the clearance for the gear endplay. Very important, too tight the pump will gall or lock up, twist the drive off. Too loose it won't prime.

Any way to determine if the pump is turning?

Any doubt about the pick up tube and screen? Any air leaks and it will suck air and loose prime. Also if the pick up tube is empty, as in the oil is drained down into the pan, and the oil is cold and thick, the pump will have a hard time drawing oil up to the gears.

If you're sure everything is mechanically sound, pack some soft grease, vaseline, etc. into the pump. Leave the gauge disconnected from the engine for an air vent. Get some heat on the oil pan if it's cold. Start it up, bring the RPM up for a second, be ready to shut it off, see if it will shoot oil out the galley.

Once it primes it will probably be ok.
 
Not much info to go on. Did the engine have pressure and you lost it? Is this after an engine overhaul? If in freezing temperatures, ice in oil pan?
Are you sure the oil pump drive gear woodruff key is in place?
Have you checked the oil pressure regulator?
If this happened after an engine overhaul, maybe the plug behind the camshaft was not reinstalled after a block cleaning.
 
The oil pump discharge tube fittings must be letting it pull in air and loose prime when parked. I had this problem for the first time last year. I tightened the tube fittings and haven't had any problem since. Farmallcub.com is a good source of info.
 
The cub oil pump is on the back of the engine above the level of the oil. (assuming the clearance is Set as in the other posts) the tube to the pan must not have leaks allowing air to enter. They are usually packed with vasoline to assure good suction. Priming also is possible by using a pump oil can and a small rubber adapter to connect it to the oil gallery (a hex key plug near the oil filter housing) or the oil pressure port. Pump Pump Pump. It may take 3 or 4 oil cans full to get it filled (I would use a pretty heavy oil in the can, like a 20-50 just to help draw up oil. A noticeable increase in the effort to pump is encountered when it is full. (This also assures bearings have oil as it is cranked) Best of luck, they can be a pain to get primed. Jim
 
Was there no oil pressure before you replaced the pump?

Had you just replaced the oil filter, draining the filter canister by the pipe behind the starter? They have to pump the system and canister full before you see any pressure on the gauge.

Have you removed the oil pan and confirmed that the oil pickup is clear of debris(goop) and the gasket is good/new where the pickup tube connects to the block? And no holes in the tube?

You may need to remove and inspect the pressure relief spring and plunger. I am thinking they are at the very front on the left side of the engine, under a cap or behind a plug, I forget which it is.

How worn is the engine? Worst case senario would be worn out bearings.
 
Was there no oil pressure before you replaced the pump? Do you know any history of the engine?

Had you just replaced the oil filter, draining the filter canister by the pipe behind the starter? They have to pump the system and canister full before you see any pressure on the gauge.

Have you removed the oil pan and confirmed that the oil pickup is clear of debris(goop) and the gasket is good/new where the pickup tube connects to the block? And no holes in the tube?

You may need to remove and inspect the pressure relief spring and plunger. I am thinking they are at the very front on the left side of the engine, under a cap or behind a plug, I forget which it is.

How worn is the engine? Worst case senario would be worn out bearings.
 
(quoted from post at 16:30:15 01/09/15)
(quoted from post at 13:12:34 01/09/15)

Can you pump oil with it, hooked to a drill motor? Idk.....how would i do that?
Click to expand...
ot practical, the pump is mounted on the rear of the camshaft behind the flywheel.

More history would help, but in the meantime, remove the spark plugs, remove the oil filter cover. Inside , opposite the filter you will see a small hole. Use a pump type oil can to put 10 or 15 strokes of oil in that hole, then spin it over with the starter until you see oil start squirting out the hole. May take a minute or so for oil to come out. Once it does, put the filter cover back on, reinstall the spark plugs and try it. 15 to 20 seconds to build oil pressure on a normal start up is normal. It will NOT show any oil pressure till the engien runs a little bit.

If this does not solve it you are going to have to go deeper. Was this engine by chance just overhauled?
Click to expand...
 
You must log in or register to reply here.

Similar threads

S
hydraulic fluid for Touch Control
Replies
15
Views
646
560Dennis
560Dennis
crsutton81
Got the Cub going
Replies
8
Views
370
4wdtom
4
S
Rear Engine Oil Leak on Gas IH 674 (C-200 Engine)
Replies
17
Views
650
Ozlander
O
P
Preserving patina on Cub.
Replies
11
Views
360
grandpa Love
grandpa Love
D
Timing a Cub with dial indicater
Replies
5
Views
482
GarryinNC
G
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