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Author Topic:   1961 Super Major Hydraulics
Mac
True Blue

Posts: 161
From: Gowen, Michigan. U.S.A.
Registered: Jan 2005

posted July 12, 2006 23:46     Click Here to See the Profile for Mac   Click Here to Email Mac     Edit/Delete Message   Reply w/Quote
Hello everyone,
It has been a while for me to make a post!! But I got the old girl out to remove a jeep engine from my trailer and the hydraulic system would not hold it up had to keep the rev's up and the lever all the way up!! If you let it idle the load would just go right down!! The system was completely checked and the pump resealed and all other seals checked and in good condition when I rebuilt the engine and also the last time I used her she would hold 4 logs up on the boom so I could cut them up!! Sounds like a stuck valve of some kind?? The oil and filters are new 30 wt.H.D. and I checked all the adjustments when I had the cover off!! She has been setting in the shop since I redid the cam and lifters last winter. Any help will be greatly welcomed!! As I really am not looking forward to pulling the cover again you know that old age thing!! He He

Always Best Regards
Mac

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GT
True Blue

Posts: 44
From: WA. Australia
Registered: Mar 2005

posted July 13, 2006 04:16     Click Here to See the Profile for GT   Click Here to Email GT     Edit/Delete Message   Reply w/Quote
G'day Mac,
From my past limited experience I would say you have a stuck or partially stuck unloading valve. I had a similar problem. The arms would come up but if you stood on them they would go down. If this is the case of with the cover again.
Regards
GT

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Brian
Rules All Things Blue

Posts: 2824
From: United Kingdom
Registered: Feb 2002

posted July 13, 2006 09:44     Click Here to See the Profile for Brian   Click Here to Email Brian     Edit/Delete Message   Reply w/Quote
Mac,

Are we talking loader here rather than the lift arms? Are you using something from the auxillary oil port on the top of the lift?

------------------
Kind regards
Brian

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Mac
True Blue

Posts: 161
From: Gowen, Michigan. U.S.A.
Registered: Jan 2005

posted July 13, 2006 19:30     Click Here to See the Profile for Mac   Click Here to Email Mac     Edit/Delete Message   Reply w/Quote
Hello,Brian
I am talking three point lift arms with a three point boom attached. Had to keep the Quadrant lever all the way up and the engine rev's up to hold it up. It would raise just like always but won't hold in the up position! I was taking a Jeep motor off from my trailer only about 300 lbs. if that! The arms raise and lower just like normal just won't hold a load in the up position! I have resealed the pump and replaced all o-rings and checked all seals and linkage adjustment by the book when I originaly rebuilt the motor! This old girl worked just fine last fall when I cut fire wood would lift four big logs and hold no problem!!! But Has been sitting in the shop since I repalced the camshaft and followers, Remember you identified the broken follower for me last Feb. Thanks for your help Brian you are God send!!

Best Regards
Mac

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Mac
True Blue

Posts: 161
From: Gowen, Michigan. U.S.A.
Registered: Jan 2005

posted July 13, 2006 20:29     Click Here to See the Profile for Mac   Click Here to Email Mac     Edit/Delete Message   Reply w/Quote
Hello,GT
Thanks for the reply,I sure don't want to remove the top cover again but I think you might be right!! The lift works like normal just won't hold a load in the up position! The Major has been setting since last Feb. after I replaced the camshaft and followers because of a broken follower!! Also found the rear cam plug lying in the bottom of the bellhousing!!! You can see the broken bits on my Fordson site www.putfile.com/mac1943 last photo on the right! Thanks again,I hope Brian has good news!! He He

Best Regards
Mac

[This message has been edited by Mac (edited July 13, 2006).]

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Brian
Rules All Things Blue

Posts: 2824
From: United Kingdom
Registered: Feb 2002

posted July 13, 2006 20:57     Click Here to See the Profile for Brian   Click Here to Email Brian     Edit/Delete Message   Reply w/Quote
Mac,
Have you an auxillary service chest with a button that pulls out? If so, raise the lift and pull out the button.

If the arms stay up. Your problem is check valve, or control valve or unload valve. Check valve can be got at without removing the lift. Its a ball and spring behind the plug on the front of the lift, near the Pressure Relief Valve.

The other bits require the top off again.

If the arms still drop: Its the piston seal, "O"Rings on the ram cylinder or the ram cylinder safety valve. For allthese the top will have to come off.

Its not heavy is it for a big boy like you? Hasn't one of your aviation colleagues got a helicopter and a bit of rope? .

Sorry but its nice to see someone else with problems. I broke my rotovator engine, went to the other side of the country to play with "my" petrol Dexta over the weekend and the head gasket blew on the Discovery and we had to be brought home on a rescue vehicle.

------------------
Kind regards
Brian

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