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Minneapolis Moline Tractors Discussion Forum
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445 power steering

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Gary

11-25-2003 12:06:33




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my 445 power steering was leaking where the steering wheel shaft connects to the damper vavle. i tore it all apart and put in a new "o" ring, but while apart i could see some wear on the shaft. it seemed pretty tight so i put it together. now, it turns easy to the left but very hard to the right, and it still leaks by that part of the damper vavle. the power steering did not work at all when i got the tractor, so any help would be appreciated.

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Kelvin

11-25-2003 18:21:48




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 Re: 445 power steering in reply to Gary, 11-25-2003 12:06:33  
Here are a few ideas:
I'm assuming that you've got at least some hydraulic pressure at the control valve. Its supposed to be 650-750 psi.
1. The reason the shaft was leaking is probably because the cylinder packing on one or both the steering pistons is leaking fluid into the gear cavity. When the level gets too high, it runs out past the o-ring on the steering shaft.
2. There is a procedure to adjust the steering valve, do you have the I/T manual for the 445? It involves having the correct number of shims behind the coupling so that the spacing between the 2 shaft-collar-like things is .040 (or is it .041?) The actuator arm itself needs to fit snugly into its groove on the steering shaft. If it is worn and doesn't fit well, the assembly has to move too far before operating the valve. The way this works is that as you turn the steering shaft, the worm gear actually tries to pull itself past the sector gear or push itself back from the sector gear, moving the actuator arm on the valve in the process. The actuator itself is threaded onto the valve spool and locked with a bolt in the front end, near the radiator. The other end of the valve spool is slotted.
Assuming everything else is o.k., to adjust the steering assist, remove the covers on both the ends of the steering spool. Then loosen the bolt locking the actuator arm to the spool a couple turns. its under the cover nearest the radiator. Since you say that it steers o.k. to the left, I think you'll have to turn the spool in a counter clockwise direction to get the spool centered so that you get the same assist in both directions. If everything is in good shape in the actuator/steering shaft setup, It will take only a fraction of a turn to make a big difference, so if you go a full turn or so and its not helping, turn the spool back to the starting point and try turning the spool clockwise.
The best way, however is to use a pressure guage and refer to the procedure in the I/T manual.

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