CHECK THE Transmission Pressure Relief / Shift Assist

TWO GUNS

TWO GUNS

Senior Member
<FONT color=#ff0000 size=4>This is was posted today on another forum. I thought everybody should read this for this is a very interesting post . And COULD be helpful forALL owners ...</FONT></P>
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<DIV id=post_message_1319641>Hello Gents

Some of you may remember the post I made with all the issues outlining the Mattracks set-up with our RTV. One of them was that the machine seemed to have some transmission issues. The machine just simply didn't seem right and as it turns out it most certainly was not working properly. The symptoms were that the machine would slow considerably when encountering anything even resembling an incline, the rpm would not drop a bit but travel speed would go to a 3-5mph on flat, any fairly steep hills and we would go to a crawl (this was in low range!!!!). The machine would not even move in hi-range on hard level surface. Again, rpm not dropping a lick through all this. We called the dealership, explained the situation and they said "that is how this transmission works!!!!!! Obviously we were going nowhere with them so we ordered a work shop manual and had our local mechanic (club member) have a look. Issue #1 was that the shift assist circuit (lever you pull to assist in shifting) was mis adjusted to the point that the tranny fluid was by-passing to the sump at what he figured as 75% to sump 25% to tranny. Issue #2, major water contamination in tranny fluid. The vent line for the hydro reservoir was positioned in a way where it was inviting water into the system. We had a collapsed transmission filter and the fluid needed replacing. We properly adjusted the previously mentioned shift assist system, vacuumed the hydro system of all contaminated fluid, replaced the tranny fluid and filter, relocated the vent line then test drove. What a difference!!!!! We can now take off easily in hi-range on a flat surface. The machine will stall out in hi-range going up a reasonable incline so we now know that the full 25hp is being used. Medium range is now a very usable range. Low range now holds 6-7 mph even going up decent inclines in 1ft of heavy wet snow with no RPM drop. Another interesting point is that the tranny shifts very smooth now and I don't see where we would need to use the assist lever at all. I hope this post helps serve a logical process to go through if you are experiencing any similar symptoms.Cheers.</DIV>
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<FONT color=#ff0000 size=5>This is a follow up on the post ~~~</FONT></P>


Yea, I would suggest that everyone have a look at the shift assist adjustment because that could be out a bit so that it is bypassing any amount. I guess it was actually a good thing that ours was so far out because it was so extreme, so noticeable that we had to do something. While talking with our mechanic member I asked if the return spring might be the culpret and he said "not a chance", had me look at the spring and showed me how strong it is. It was all an adjustment issue. It is possible that there are several of these units running around with differing amounts of bypass from mis adjustment. I am not sure if this is factory set or if dealers are supposed to set this. From what I have seen so far I'd say that it is VERY likely our dealer doesn't even know the circuit is there! </P>


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Thanks, Two Guns! I've had a few episodes of no power on small short hills for no explainable reasons. I posted about them a while ago. This might be part of the reason.</P>


If anybody knows where this adjustment is made please step right up and sing it out.</P>


Thanks, again. </P>
 
You do know about the " two stage trannsmission " technique on letting off the fuel pedal approx half way, for the power to kick in ? </P>


Here is alink :</P>


http://compacttractorreview.com/cs/forums/post/8086.aspx</P>
<DIV><FONT face=Arial size=2> <FONT face=JohnHancock><FONT color=#ff0000 size=6>~~~~ Two Guns~~~~ </FONT></FONT></FONT></DIV>
 
Go up hill and "let off the gas"! That takes practice, but once you get it, no hill stands in your way. Remember its a fluid by-pass valve not a gas pedal.
 
I'm aware of letting up on the pedal.I tried it duringthe couple of times that I had no power at all. Engine was fine, sounded like it had a small load on it, but the RTV was definitely stalled out. Bypassing too much fluid make perfect sense - having it happen once in a while doesn't. </P>


A couple of posters have mentioned that they can spin their wheels if they floor it from a stand still. Mine has never been able to do that (not that I do it all the time). I'll be looking into it. </P>
 
I saw this on the other site also and have only used my machine for about a half hour but I noticed that mine slowed down on a hill but the engine RPM did not seem to drop or strugle like it was pulling a load. If it ever stops raining here in the Seattle area I am going to try it out again.
 
Oh yes, it takes practice for sure. Heck, when I found out about it from this forum at 11:30 pm one night, off to the river banks of the Mississippi River I went, practiced until about 4:30 am the next morning. It does work, but does take a little pratice. ( the RTV was brand new, and I was having a blast praticing with it ) Mrs. Two Guns thought I was crazy !! [*-)] But mister, that night, I got it down pat .>>>>> just likemoving your eyes, it now comes automatic now !!!!</P>
<DIV><FONT face=Arial size=2> <FONT face=JohnHancock><FONT color=#ff0000 size=6>~~~~ Two Guns~~~~ </FONT></FONT></FONT></DIV>
 
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