Farm Equipment - CA Hydraulics

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CA Hydraulics

Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=16732
Printed Date: 05 Feb 2025 at 8:15am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: CA Hydraulics

Posted By: Allis Barn
Subject: CA Hydraulics
Date Posted: 17 Aug 2010 at 5:05pm

Finally completed restoration of a CA. Engine, hand clutch, transmission OK.

But hydrulics are less than perfect. When I have weight (plow, bush hog etc) on the three point hitch it does not hold the position I set. Leaks down.

Used the CA service manual for setting up the pumps and assorted linkage.

What is most likely problem, leaking checks valve inside pump? Something else?

I have reworked the hydraulic pumps on B and C model, but have never broken into a CA pump.

It has been a long time since posting on the forum. Hope all are well.

Thanks

Bob(VA)

Replies:

Posted By: kip in cny
Date Posted: 17 Aug 2010 at 5:07pm

it may be the hyd cly on the tractor leaking inside. How fast are things going down on you

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160 CA 920diesel 5020 HD-3

Posted By: Allis Barn
Date Posted: 17 Aug 2010 at 5:37pm

I just parked it ten mintues ago with a subsoiler in the raised position. Now the blade of subsoiler is resting on the ground. I did replace the packing on one cylinder as there a slight leak to the outside.

Thanks

Bob(VA)

Posted By: Bill Long
Date Posted: 17 Aug 2010 at 8:58pm

Bob, If the hyd is leaking it is usually the lift linkage being out of adjustment or and the hold position valve leaking. The hold position valve is in the bottle shaped valve on the top of th pump.

First be certain the hyd is adjusted for the HOLD position.

A screw - bottom of pump screwed into recess in pump

B screw - screw on bottle shapped item locking plates together

c screw - screw on end of bottle shaped valve all the way out

d screw - front of pump nearest rear end all the way out

Now unfortunatley that is from memory - I do hope others are kind enough to correct me.

Good Luck!

Bill Long

Posted By: wkpoor
Date Posted: 17 Aug 2010 at 9:15pm

You are correct Bill on the hold position set up however on my CA I can hold position with or without the plates locked together. Its just easier when you can feel the detent.

Posted By: CTuckerNWIL
Date Posted: 18 Aug 2010 at 7:51am

There are only 2 ways it can leak down. 1 the hold valve isn't and oil is going back to the sump thru it. 2 oil leaks out of the packing and lets cylinder drift down. There is no way an Allis one way cylinder can leak down internally.
I guess a third way would be the hose leaking, but you would see that just as well as the packing leak.

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Lena 1935 WC12xxx, Willie 1951 CA6xx Dad bought new, 1954WD45 PS, 1960 D17 NF

Posted By: firebrick43
Date Posted: 18 Aug 2010 at 12:56pm

I really don't have anything worth adding, but would like to thank you for spelling "hydraulics" correctly. For some reason it really grates me when others do not/can not and amazes me on how commonly others do not.

Posted By: caRon
Date Posted: 18 Aug 2010 at 3:53pm

Man! your right firebrick, that wasn't worth adding. Hope I never misspell a word.

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CA Tractor

Posted By: Allis Barn
Date Posted: 18 Aug 2010 at 7:52pm

OK, I am back again. Hope you can bear with me.

Will try and improve my spelling. I have just noted that this new forum layout has "spell check". I will use.

I rechecked the set up as outlined by Bill Long and cross checked it against my service manual. The set up is as Bill described.

Maybe I am expecting something the system can not delivery!

When I raise an implement to maximum height and the hydraulic pump is running, the implement stays up. When PTO or engine is turned off the implement slowly drops to the ground over about five mintues. Is this the way it is suppose to work?

When I try to set an intermediate height on the amount of lift, like setting the depth of subsoiler blade, system is either coming up or going down. I can not set a specific height (other then maximum height) and have implement hold in that position. Is these correct operation of the system? I had assumed that when the detent position was reached, the lift would hold in the position but it does not.

Thanks for help

Bob (VA)

Posted By: caRon
Date Posted: 18 Aug 2010 at 9:07pm

Allis Barn, if you are considering rebuilding your hydraulic pump, I have a complete parts list with prices I can send you. I ordered everything from Dean Ag. Easy and inexpensive rebuild. Ron

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CA Tractor