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Discussion Forum

Re: Hough transmission

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Dennis K (WA)

11-06-2012 08:28:47

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Good morning,

My first thought was too heavy oil also but you have used the right stuff.

The other replies are also valid like a suction leak.

You did not mention pressures at all. Main (clutch) pressure should be 160psi-180psi. You should have this in neutral, in any gear, at idle or hi idle. Do you know what the pressures are? Does the machine have a gauge on the dash? If no gauge you can tap in a gauge at a pipe plug on the selector valve on top of the transmission. This is the main pressure port. Use a 300-500psi gauge, not one that goes to 3000 or something.

Another thought has to do with the selector valve. It has three spools, a F&R spool, range spool and a declutch spool which is activated by the left brake if it is still stock. The shift spools are probably ok if the detents feel good but maybe a problem in the declutch spool. Disconnect the line to it, some were air, and try it. If the declutch spool is not moving properly it will not allow pressure to get to the clutches.

Torque converters are rebuildable but probably not your problem.

good luck and keep us posted on progress


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Bill in IL

11-06-2012 10:36:23

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 Re: Hough transmission in reply to Dennis K (WA), 11-06-2012 08:28:47  
Clutch pressures are in the 160 to 180 range as you describe. There is a guage on the dash to show that. Even when the machine will not move on startup clutch pressures are in range. The brakes do not work but the declutch pedal will take the transmission out of gear.

I think the problem is more related to the torque converter side of the transmission. I would describe its operation as sluggish and it takes about half throttle to make it really move. I have an old michigan 75a that responds to throttle much better than this machine. Shifting is normal and I can feel detents though probably worn as can be expected.

I think the suggestion of a suction leak or collapsing suction line are possibilities. Any suggestions on determining a suction leak or collapsed line? When I crawled under there they all seemed round and hard with age no bad ends or leaks from those hoses. It will be a healthy expense to replace all the lines in that circuit cause they are 1.25 to 1.5 inches in diameter so I don't want to go throwing parts at it.

I will give it a closer look tonight. Maybe drain the transmission and check suction hoses closer.

I remember one day this fall I drove down a steep hill and could not get back up it till the machine warmed up a little more. I gave it full throttle and it could only go up half the hill till about the 3rd try.

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11-06-2012 12:44:55

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 Re: Hough transmission in reply to Bill in IL, 11-06-2012 10:36:23  
Well if your oil pressure is steady under all conditions that would tend to rule out a suction problem. That would bring me back to looking for control issues that were mentioned before.
A torque converter is a simple device and they either work or not, and temperature does not have a lot to do with it.

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