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have a cat 428 series ii backhoe ,stopped driving all of a…

have a cat 428 series...
have a cat 428 series ii backhoe ,stopped driving all of a shot ,no forward or reverse ,checked oil level and de clutch solonoid all seem fine .forward and reverse control block seem fine .put pressure guage on to test piont on top off transmission and ran machine ,got no pressure on clock ,not sure is this test piont is main transmission pressure or torque converter pressure, transmission and engine are still in contact at flywheel.
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Answered in 3 hours by:
5/18/2012
Mechanic: catmastertech, Technician replied 10 years ago
catmastertech
catmastertech, Technician
Category: Construction and Road Equipment
Satisfied Customers: 3,998
Experience: Field service technician for CAT 19 years.
Verified

Here is some information to help you find the correct pressures.

TESTING

Let me know what you find after you record the pressures.

Did disconnecting the de-clutch solenoid change anything?

Have you drain the oil and checked the strainer? If so, did you find anything in the oil?

Replace the filter and cut open the old filter to see if it contains metal.

Check these items and we will get into this problem deeper.

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Customer reply replied 10 years ago
thanks will check it out and will get back to you
Mechanic: catmastertech, Technician replied 10 years ago

ok

catmastertech
catmastertech, Technician
Category: Construction and Road Equipment
Satisfied Customers: 3,998
Experience: Field service technician for CAT 19 years.
Verified
catmastertech and 87 other Construction and Road Equipment Specialists are ready to help you
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Customer reply replied 10 years ago

hello again

sorry about delay just checked out pressures on main transmission and found 0 pressure on guage ,drained oil and checked strainer found metal particles on strainer,took out transmission and found that coupling from torque converter to oil pump had broken off, is this a common problem on these machines. thanks again for this info as it was helpful. is there any dimensions of torque converter shaft of turbine so i could repair it or can it be repaired .

Mechanic: catmastertech, Technician replied 10 years ago

I have never seen anyone repair the convertor and I cannot find any spec's for the convertor. I have always installed new parts.

A new convertor was added back in 1990 but, it was about the pilot stub on the front side. It is important to align the flex plate to the convertor. A special tool is needed to do this. You may want to get the dealer to install the flex plate to keep it centered.

I am sure you need a new pump as well, I have heard of some off brand parts available but, I still recommend the CAT parts. Ask for classic if they are available. It will save money but, make sure the fit is right before getting to deep into the repair. Some classic parts are not the right size from the factory.

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Category: Construction and Road Equipment
Satisfied Customers: 3,998
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