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Author Topic: Lt 40 hyd switch  (Read 253 times)

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Offline CMI80

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Lt 40 hyd switch
« on: December 24, 2017, 03:21:57 PM »
Wondering if anyone has had trouble with the mico switch sticking ( staying on) when lever is released on the hyd controls. This only happens when the temps are below 30 F. And is only happening on the up/down lever on the four way clamp. 

Offline Bandmill Bandit

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Re: Lt 40 hyd switch
« Reply #1 on: December 24, 2017, 03:34:38 PM »
Yes I have had that problem occasionally below freezing.

I use a shot DeoxIt spray to clean the switch and the rocker mechanism when it happens.
http://caig.com/
I use the red can. Has worked every time so far.
If you ain't livin on the edge you are takin up way to much room. Of course at my age if I get too close to that edge any more theres a good chance I may fall off.
2001 Dodge 1500 4x4.
2007 Woodmizer LT40HDG28 almost Super
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Offline terrifictimbersllc

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Re: Lt 40 hyd switch
« Reply #2 on: December 24, 2017, 03:45:30 PM »
The switch button is pressed down by a rocker on the end of the same shaft that all of the levers use.   

If it is a problem of the switch button not springing back when the rocker is released that is a problem with the switch.

If the problem is that the rocker arm doesn't release pressure on the switch button when just one of the levers is pushed down and released, that is a different problem.

I would look carefully at the rocker assembly and switch button and try to see which it is.

p.s. I'm familiar with the valve/rocker assembly and switch in a LT40 front remote.  I dont know if yours is different.
DJ Hoover, Terrific Timbers LLC,  Mystic CT   2001 WM LT40SHDD (42HP Kubota, Accuset2, FAO's, Lubemizer, debarker, hydraulics everywhere), Peterson WPF 10-30 with chain slabber. LogRite fetching arch, WM BMS250 sharpener/BMT250 setter.

Offline CMI80

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Re: Lt 40 hyd switch
« Reply #3 on: December 24, 2017, 04:18:01 PM »
Yes it's the rocker arm not releasing. The pin is sticking on the one control lever holding the rocker from moving back to the neutral position. I have to remove the cover and manually release the rocker arm with my hand. I have sprayed it down with a lubricant but did not help. May need to try a stronger solvent as suggested. Wonderful if a stronger spring would do it?

Offline terrifictimbersllc

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Re: Lt 40 hyd switch
« Reply #4 on: December 24, 2017, 05:55:17 PM »
New one for me.
Pin that extends when the valve is activated is supposed to return when lever is released.  Maybe some crud or ice in there?   Is that pin spring loaded for its return or is it supposed to be pushed back just by the spring return mechanism of the rocker arm assembly?

Maybe when you have it open, hold the rocker arm assembly to the ON position, then see if it is harder to push that pin back in than one of the others.

I'd call WM with that one, get a diagram of the valve see if it can be disassembled and cleaned or ask whether it could be caused by some water in the hydraulic fluid.
DJ Hoover, Terrific Timbers LLC,  Mystic CT   2001 WM LT40SHDD (42HP Kubota, Accuset2, FAO's, Lubemizer, debarker, hydraulics everywhere), Peterson WPF 10-30 with chain slabber. LogRite fetching arch, WM BMS250 sharpener/BMT250 setter.

Offline CMI80

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Re: Lt 40 hyd switch
« Reply #5 on: December 24, 2017, 07:15:26 PM »
Yes the spring on the rocker arm is suppose to push it back. Must be dirt in the pin sleeve that is freezing up at lower temps. Will try different spray cleaner. If that doesn't work I'll take it apart 😕.

 


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