hard to turn nose wheel on 1972 cessna 172

hard to turn nose wheel on 1972 cessna 172

Hello

i have a 1972 cessna 172 and i can barely turn the nose wheel with both the rudder pedals and tow bar.  any one have an idea of why this would be? 

thanks

kyle

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Re: hard to turn nose wheel on 1972 cessna 172

How much piston is showing? (Should be around 3 inches) If the strut is over inflated, there is centering lug that prevents the nose wheel from turning. This lug is located on the underside of the upper torque link and mates with a flat on the rear of the nose gear. The only other thing that I can think of is the shimmy dampener could have a bent piston. Some folks have been known to service these units with engine oil to get rid of nose wheel shimmy, which makes steering difficult as well. BTW the unit is normally serviced with hydraulic fluid (MIL-H-5606).

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Re: hard to turn nose wheel on 1972 cessna 172

i think the nose wheel has about 5 inches showing.  hum.  how do i release some of the air?

thank you very much for the possible fix.

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Re: hard to turn nose wheel on 1972 cessna 172

There is an air valve at the top of the strut from where the strut is serviced. I highly recommend that you get a service manual and get guidance from a licensed mechanic. If you are unfamiliar with this it could hurt...

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Re: hard to turn nose wheel on 1972 cessna 172

i guess the worst that can happen is that the strut goes flat.

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Re: hard to turn nose wheel on 1972 cessna 172

I use an engine hoist attached to the lift ring on the engine to take the weight off of the nose wheel.  I can then release the air in the strut without it spraying hydraulic fluid all over, and refill it to the recommended pressure, which I think is 45 psi on a C-172.  If you have access to comressed nitrogen, it works better that air.  This is usually a good time to top off the strut with hydraulic fluid as well, as you need to get the weight off of the strut to do that.  The procedure will be covered in your service manual.

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Re: hard to turn nose wheel on 1972 cessna 172

Kyle, Do not use your thunb nail to take air out of the strut.  It could put Hydraulic fluid into you body...not good...Get an A&P to help out.
Check the steering collar for proper lubrication.  Put grease into the zerk fitting and inspect the grease that is pushed out, discolor is ok, but does it look rusty?  Aeroshell 5 is a blonde color.  The needle bearings may need to be looked at.

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Re: hard to turn nose wheel on 1972 cessna 172

too much air was the key for the hard to turn nose wheel.  i let some out and voila, strut went down about an inch or so.  i let it out really slow so as not to get fluid to come out.  turns like a dream now.  it looks like the strut was recently serviced, all greased up, etc. 

thanks for the hot tips.

kyle

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Re: hard to turn nose wheel on 1972 cessna 172

Yeah I made Hydraulic fluid leak out before! Believe me.. not good!!! hmm

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Re: hard to turn nose wheel on 1972 cessna 172

nose wheel start vibrating after gaining takeoff speed.

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Re: hard to turn nose wheel on 1972 cessna 172

I accidently dumped all the oil by lifting the front with elbow disconnected and now i don't know how much to put in, and also there is a difference between 5606H and 5606A oil?

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Re: hard to turn nose wheel on 1972 cessna 172

As long as the fluid is 5606 it is OK. The strut should be filled with the strut in the collapsed position.

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Re: hard to turn nose wheel on 1972 cessna 172

yes, i think kyle is right...


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