1466 hydraulic problem

Ed pap · Jun 9, 2012

I am looking for some opinions - I have a 1466 when you step on the brakes the transmission light will come on and TA will loose pressure and free wheel. it steers fine. I made the mistake of not running thru the pressure checks because I thought for sure i would find something wrong in the MCV valve so I removed it and took it apart and found nothing wrong, I thought for sure I would find a torn gasket or broken spring or something. so now I am scratching my head with this one. one other strange thing - when i hold the steering all the way over it draws the engine down but then if I shift the TA while holding it over the safety relief will make a very loud chatter until I let up on the steering. This is a strange one !

Thanks Ed

Janicholson · Jun 9, 2012

The standard answer to that problem is to overfill the hydraulic system by about 5 gallons. this covers up a leaky Oring on the intake side of the MCV pump. If it works it is permanent till you decide to go after other issues, and it is cheap. Jim

pete 23 · Jun 9, 2012

The 66 series uses a closed center brake valve unlike the 06 series that used open. In other word, when you use the brake you are using oil from regulated circuit, so if you did not have an orfice in the brake inlet that might be the problem. Other wise, a leaking sump check valve could be problem. As long as steering works good I think we can forget about pump, flow divider and flow control valve orfice. It all comes back to pressure testing and comparing results in all positions. Remember, when checking regulated pressure, the middle position should drop 20 psi which tells you regulator valve is moving freely as there is no flow to ta in that position. You can often pin point a problem area with gauges but sometimes it just tells you things are working properly or not as you more than likely know already.

1466 hydraulic problem

Ed pap

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Janicholson

Well-known Member

pete 23

Well-known Member

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