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Leo_MN 
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Joined: 17 Sep 2009
Location: Minnesota
Points: 9
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 Topic: Char Lynn Power Steering
Posted: 21 Sep 2011 at 7:32am |
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I have a used Char Lynn SF-101 power steering unit we installed on a D17 gas tractor. We added a new Prince flow divider to supply 3GPM @ 1000 psi to the unit. It works but in "chunks." If you are standing still and try to turn in either direction it feels like it is binding. When you get the wheels to turn just a little then they move easily. The same is true when you are traveling. The unit sticks in other places too but randomly. Is the unit bad or what else can I try? Does anyone rebuild these units?
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CTuckerNWIL
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Joined: 11 Sep 2009
Location: NW Illinois
Points: 22824
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Posted: 21 Sep 2011 at 7:47am |
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What kind of shape is your steering gear in? If it binds while turning, the power steering unit won't fix that and may have a hard time overcoming the bind. Things only get worse when you try to steer while the wheels aren't moving.
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Nathan (SD)
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Joined: 11 Sep 2009
Location: Day County SD
Points: 1277
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Posted: 21 Sep 2011 at 9:06am |
You used the tractor hydraulics to supply the ps unit? I would test to make sure you are actually getting a steady 1000 psi to the unit. Just T-in a pressure gauge and then watch it when you try to use the unit.
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Bull
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Joined: 28 Sep 2010
Location: Lamar, Missouri
Points: 589
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Posted: 21 Sep 2011 at 9:27am |
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I had a complete Char Lynn unit on a 45 years ago. It performed exactly as you describe.
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Leo_MN
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Joined: 17 Sep 2009
Location: Minnesota
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Posted: 21 Sep 2011 at 9:27am |
The tractor has been hard to steer even without the loader but never in "chunks," just stiff. I never thought it was abnormal for a heavy old manual steering tractor though. With that update, do you still think it could be the steering gear?
We had the front end off to add the front mounted pump but never looked at the steeering gear mechanism. It has a wide front and the 3 rib tires.
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Leo_MN
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Joined: 17 Sep 2009
Location: Minnesota
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Posted: 21 Sep 2011 at 9:32am |
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We have a front mounted pump for live hydraulics that is used for both the loader and the Char Lynn. The flow divider priority is the Char Lynn with whatever is left over going to the loader. I will be measuring the pressure to the Char Lynn that should confirm or eliminate any flow / pressure problems. Thanks
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WD45
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Joined: 20 Sep 2009
Location: STAYNER,ONTARIO
Points: 955
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Posted: 21 Sep 2011 at 7:59pm |
Have a unit on our WD45 diesel. Works very well.
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Fred Dunlop, G,B,CA, WC,WF, 3 WD45`s,gas, diesel and LP,U,D10 series III, D12,D14,D15 SERIES II,D17 Series IV in Gas and Diesel ,D19 GAS and D21,170 185,210 ,220 an I-600 8070 fwd, 716H and 1920H
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CTuckerNWIL
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Joined: 11 Sep 2009
Location: NW Illinois
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Posted: 22 Sep 2011 at 8:10am |
 Leo_MN wrote:
The tractor has been hard to steer even without the loader but never in "chunks," just stiff. I never thought it was abnormal for a heavy old manual steering tractor though. With that update, do you still think it could be the steering gear?
We had the front end off to add the front mounted pump but never looked at the steeering gear mechanism. It has a wide front and the 3 rib tires. |
Yes, if it would steer hard before the loader and PS there is something wore out. With proper working steering gear, you should be able to steer with a spinner knob, without much effort, as long as the tractor is moving. A little grease goes a long way also. Jack the front end up before trying to grease the king pins.
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skipwelte
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Joined: 29 Oct 2009
Location: Anthon, Iowa
Points: 723
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Posted: 22 Sep 2011 at 8:38am |
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I have 3 of those Char Lynn units, I do notice that if you are not moveing there is a resistatnce to turning the steering wheel at first. If your at or near idle it steers hard. Rev up the motor and move the tractor it steers well, the initial resistance is still there, just not near as noticeable. HTH
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