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Allis Chalmers Discussion Forum

Transport valve

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Steve C

02-18-2005 14:52:15

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I purchased wd45 parts tractor with a transport valve. I was wondering what the difference between a transport valve and a hydraulic remote is?

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Don Dittmar

02-19-2005 04:48:28

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 Re: Transport valve in reply to Steve C, 02-18-2005 14:52:15  
The transport valve was designed to work with semi mounted implements. The transport valve is a hyd remote, but oil pressure is delayed to the remote cylinder and sent to the lift arms first. If you was pulling a semi mounted implement without the valve, when you went to raise the implement the lift arms would raise all the way up first, then the remote would lift all the way, this picks the implement up uneven. The transport valve allows the implement to be raised evenly by delaying oil pressure

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02-20-2005 18:47:49

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 Re: Transport valve in reply to Don Dittmar, 02-19-2005 04:48:28  
While you are accurate in saying that the transport valve directs oil to the lift arms first, its purpose is not to make the implement raise "evenly". The purpose of the transport valve is to allow the use of the traction booster system with large semi-mounted implements. The traction booster system operates around 1200 psi and the lift presure is about 3500 psi. When the traction booster is operating, the 1200 psi oil is allowed to flow only to the lift arms which then transfers implement weight to the tractor wheels. No oil flows to the ram on the implement which would lift it out of the ground. When the operator want to raise the implement, then the higher pressure oil can flow past the transport valve and to the ram on the implement. The large round knob on the valve is used to turn the operation of the valve on and off. When turned all the way in one direction ( I forget which way) then it's like the valve is not there...it does nothing. WHen turned all the way in the other direction, it operates like I described above.

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Don Dittmar

02-21-2005 05:06:41

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 Re: Transport valve in reply to DanD., 02-20-2005 18:47:49  
thnaks for the correction dan. we never had transport vlaves on our tractors, we never even used the snap coupler, we were hay farmers so all of our work was pto work.

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