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D8K Need Info

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Eduardo
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Hi, The main problem is an high pressure on the hydraulic system. After satarting the engine, the transmission oil filter case jump out due to high pressure on the hydraulic, without any movement of the machine.

Thanks.
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Wed, Mar 14, 2012 9:15 PM
Mike Walsh
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[quote="Eduardo"]Hi, The main problem is an high pressure on the hydraulic system. After satarting the engine, the transmission oil filter case jump out due to high pressure on the hydraulic, without any movement of the machine.

Thanks.[/quote]


Are you saying the top of the transmission filter lifts up and oil flows out when you start the engine.

Are the bolts stripped out. Check the threads in the trans filter housing. You may have to helicoil the filter housing. While you're working on the trans filters, you should pull your magnetic screen and clean it. If your filters have not been changed in a while, now would be a good time to do this as well. How much iron has been captured by the screen. Are your filters in tact or collapsed. Save the old filters so they can be examined for transmission material.

If your magnetic screen is fine and your filter housing is not stripped, come back for more info.
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Thu, Mar 15, 2012 12:46 AM
Old Magnet
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What have you checked?
Have you looked for any crimped lines or hoses or signs of blockage?
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Thu, Mar 15, 2012 12:50 AM
Eduardo
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Reply to Mike Walsh:
[quote="Eduardo"]Hi, The main problem is an high pressure on the hydraulic system. After satarting the engine, the transmission oil filter case jump out due to high pressure on the hydraulic, without any movement of the machine.

Thanks.[/quote]


Are you saying the top of the transmission filter lifts up and oil flows out when you start the engine.

Are the bolts stripped out. Check the threads in the trans filter housing. You may have to helicoil the filter housing. While you're working on the trans filters, you should pull your magnetic screen and clean it. If your filters have not been changed in a while, now would be a good time to do this as well. How much iron has been captured by the screen. Are your filters in tact or collapsed. Save the old filters so they can be examined for transmission material.

If your magnetic screen is fine and your filter housing is not stripped, come back for more info.
[quote="Mike Walsh"]Are you saying the top of the transmission filter lifts up and oil flows out when you start the engine.

Are the bolts stripped out. Check the threads in the trans filter housing. You may have to helicoil the filter housing. While you're working on the trans filters, you should pull your magnetic screen and clean it. If your filters have not been changed in a while, now would be a good time to do this as well. How much iron has been captured by the screen. Are your filters in tact or collapsed. Save the old filters so they can be examined for transmission material.

If your magnetic screen is fine and your filter housing is not stripped, come back for more info.[/quote]


Mike,

No, I am saying housing down when pressure is high of the Transmission filter (No, Magnetic Screen) when engine start.

The Magnetic Screen is clean.
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Fri, Mar 16, 2012 11:52 PM
Eduardo
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Reply to Old Magnet:
What have you checked?
Have you looked for any crimped lines or hoses or signs of blockage?
[quote="Old Magnet"]What have you checked?
Have you looked for any crimped lines or hoses or signs of blockage?[/quote]

Old Magnet,

Yes , I checked are ok
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Fri, Mar 16, 2012 11:56 PM
Old Magnet
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Reply to Eduardo:
[quote="Old Magnet"]What have you checked?
Have you looked for any crimped lines or hoses or signs of blockage?[/quote]

Old Magnet,

Yes , I checked are ok
The filter housing is normally a one piece unit with removable lid.
Are you saying the housing is separated or damaged?
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Sat, Mar 17, 2012 12:34 AM
Mike Walsh
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[quote="Eduardo"]Hi, The main problem is an high pressure on the hydraulic system. After satarting the engine, the transmission oil filter case jump out due to high pressure on the hydraulic, without any movement of the machine.

Thanks.[/quote]

I am not sure what your problem is from your description. Please describe your problem in more detail.

If you have a Torque Converter failure, it would force oil out of many places. If the relief valve on the filter housing head failed you will hear a whining sound. If your transmission filters are installed improperly, the filters will move around. Is the spring intact. Is the spacer installed between the filters.

Your transmission filter is not part of the main hydraulic system. It delivers oil to a separate transmission hydraulic pump. If you have a high pressure problem not related to the Converter, there are lots of other things to look at once I have a better idea of your problem.

Any chance you can post a picture of the problem area.
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Sat, Mar 17, 2012 1:04 AM
Old Magnet
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Reply to Mike Walsh:
[quote="Eduardo"]Hi, The main problem is an high pressure on the hydraulic system. After satarting the engine, the transmission oil filter case jump out due to high pressure on the hydraulic, without any movement of the machine.

Thanks.[/quote]

I am not sure what your problem is from your description. Please describe your problem in more detail.

If you have a Torque Converter failure, it would force oil out of many places. If the relief valve on the filter housing head failed you will hear a whining sound. If your transmission filters are installed improperly, the filters will move around. Is the spring intact. Is the spacer installed between the filters.

Your transmission filter is not part of the main hydraulic system. It delivers oil to a separate transmission hydraulic pump. If you have a high pressure problem not related to the Converter, there are lots of other things to look at once I have a better idea of your problem.

Any chance you can post a picture of the problem area.
Here is the Hydraulic Schematic.....there is only one main pump and a combination scavange and recirc pump.

The filter housing has a differential pressure relief valve set at 25 psi.

Main pump hydraulic pressure is approx. 415 psi so it would seem very unlikely that hydraulic pressure would fracture the filter housing. If the pump/filter discharge became blocked pressure could get pretty high as there is no relief at that point.

Agree there is not a lot of info to go on.
If the filter housing is busted I'd be suspect of physical damage, not hydraulic. At least at this time.
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Sat, Mar 17, 2012 2:02 AM
Eduardo
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Reply to Mike Walsh:
[quote="Eduardo"]Hi, The main problem is an high pressure on the hydraulic system. After satarting the engine, the transmission oil filter case jump out due to high pressure on the hydraulic, without any movement of the machine.

Thanks.[/quote]

I am not sure what your problem is from your description. Please describe your problem in more detail.

If you have a Torque Converter failure, it would force oil out of many places. If the relief valve on the filter housing head failed you will hear a whining sound. If your transmission filters are installed improperly, the filters will move around. Is the spring intact. Is the spacer installed between the filters.

Your transmission filter is not part of the main hydraulic system. It delivers oil to a separate transmission hydraulic pump. If you have a high pressure problem not related to the Converter, there are lots of other things to look at once I have a better idea of your problem.

Any chance you can post a picture of the problem area.
[quote="Mike Walsh"]I am not sure what your problem is from your description. Please describe your problem in more detail.

If you have a Torque Converter failure, it would force oil out of many places. If the relief valve on the filter housing head failed you will hear a whining sound. If your transmission filters are installed improperly, the filters will move around. Is the spring intact. Is the spacer installed between the filters.

Your transmission filter is not part of the main hydraulic system. It delivers oil to a separate transmission hydraulic pump. If you have a high pressure problem not related to the Converter, there are lots of other things to look at once I have a better idea of your problem.

Any chance you can post a picture of the problem area.[/quote]

Mike,

Yes, I post picture
Attachment
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Sat, Mar 17, 2012 3:57 PM
Eduardo
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Reply to Old Magnet:
The filter housing is normally a one piece unit with removable lid.
Are you saying the housing is separated or damaged?
[quote="Old Magnet"]The filter housing is normally a one piece unit with removable lid.
Are you saying the housing is separated or damaged?[/quote]

Old Magnet,

I found separated.
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Sat, Mar 17, 2012 4:08 PM
Mike Walsh
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Reply to Eduardo:
[quote="Old Magnet"]The filter housing is normally a one piece unit with removable lid.
Are you saying the housing is separated or damaged?[/quote]

Old Magnet,

I found separated.
Eduardo. I've never seen a transmission filter body come apart like that. Separation was not caused by pressure from the transmission pump. The filter body has a relief valve which opens and allows the hydraulic fluid to bypass if the filters are plugged. OM previously stated the valve opens at 25lbs. Someone else may jump in here who knows differently but I do not believe a failed relief valve would cause that damage. If hydraulic pressure caused that failure, the torque converter is the only device that can generate enough oil volume to split that filter body.

Are you sure hydraulic pressure caused the failure. Was the filter housing bolted securely to the engine block. Did it vibrate and crack over time. Can you determine if the filter body was hit by a tree limb or some other object which caused the damage.

What did the filters / filter stack look like? Intact, collapsed, bent.
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Sat, Mar 17, 2012 9:01 PM
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