996 loader problem

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benl
Posts: 25
Joined: Fri May 14, 2010 8:09 pm
Location: Dorset

996 loader problem

Post by benl » Wed Jun 07, 2017 7:48 am

I would be really grateful for some help. The loader on my 996 has stopped working. When I pull the lift leaver on the valve chest the loader will life about 1/2 inch and stop. The link arms are working fine. Oil level is fine. I changed the main filter and oil not too long ago.

Any ideas?

Many thanks

Ben

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mart1602
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Joined: Wed Jun 23, 2010 6:45 pm
Location: pembs
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Re: 996 loader problem

Post by mart1602 » Wed Jun 07, 2017 2:14 pm

lift arms shouldnt work at same time as loader,you need to move the 3 way valve

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ollek
Posts: 3742
Joined: Tue Apr 10, 2012 1:20 pm
Location: South West Finland

Re: 996 loader problem

Post by ollek » Wed Jun 07, 2017 6:53 pm

You said "pull the lift leaver on the valve chest". Is there a separate valve for the loader? The valve chest is the Selectamatic valve inside the tractor and the lever for operating this is the hydraulic main control lever. If there is a separate loader valve, where are the feed and return to the loader valve connected? Do the tractor have a double acting spool valve, a 3-way valve or both? Is the loader double or single acting?

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benl
Posts: 25
Joined: Fri May 14, 2010 8:09 pm
Location: Dorset

Re: 996 loader problem

Post by benl » Wed Jun 07, 2017 9:30 pm

The loader has its own valve chest with operating leavers directly off it. The loader is connected to port 1 (the first port below) of the 3 way valve. The return goes to one (I can't remember which) of the ports on the camel humps. The lift arms of the loader are single acting rams. The crown ram is double acting.

I have the 3 way valve on 1, the quadrant on external and the hydraulic leaver pulled right back to select. All was working fine. Now the link arms will lift. Link arms work when 1 or 2 are selected. When I operate the lift leaver on the loader, the loader will lift up about 1/2 inch and then stop. If I let go of the leaver and then operate it again it will rise by another 1/2 inch.

I decoupled one of the feed pipes to the lift rams. There was oil in the pipe which spat out when I pushed the male end in.

Possibly some form of blockage from the 3 way valve to the loader chest?

Thank you for your help.

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ollek
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Joined: Tue Apr 10, 2012 1:20 pm
Location: South West Finland

Re: 996 loader problem

Post by ollek » Thu Jun 08, 2017 5:15 am

The 3-point hitch will NOT work if the 3-way valve is in position 1 or 2. Position L or1/L has to be selected for the hitch to work. As you now have given the impression that there is quick couplers in the lines to and from the loader valve, I suspect that one or more the quick couplers are at fault or not connected properly, preventing the oil flow to or from the loader valve. Try to remove the quick couplers and connect the hoses directly. Are the hoses to the loader valve connected the right way around? The "quadrant" is the segment the main control lever is working in, the switch for the 3 different functions is called "selector switch". You said that the bucket crowd is double acting. Is the bucket crowed working?

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benl
Posts: 25
Joined: Fri May 14, 2010 8:09 pm
Location: Dorset

Re: 996 loader problem

Post by benl » Fri Jun 09, 2017 9:24 pm

A former mechanic from our local David Brown dealer had a look at the tractor with me. We took the PTO housing off and took the hydraulic pump apart. The pump was basically worn out. New pump on order, hopefully this will solve the problem.

Thank you for your help

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ollek
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Joined: Tue Apr 10, 2012 1:20 pm
Location: South West Finland

Re: 996 loader problem

Post by ollek » Sat Jun 10, 2017 5:15 am

You said "The link arms are working fine". The same pump is supplying oil to the 3-point hitch and to the loader. A worn pump will therefore have an effect on both the 3-point hitch and the loader as the pressure delivered will be low resulting in reduced lift force. The 3-point hitch can not be "working fine", if the pump is worn out. It is very important to give an accurate explanation of the problem.

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