Weak hydro only in reverse

[John147]

Hi everyone so i've noticed since i bought my 1512 the reverse wasn't nearly as strong as forward. Sorry for the long rear and sentences i'm no English major.

I replaced the pump and rebuilt the drive line after i first purchased it this really made no improvement. The next thing tried adjusting the lever as per the manual and this made no difference with power output.

Then a few months ago i had a leaking release valve i replaced it with a used one and this made reverse a little better.

The trunion has very minor wear could this cause reverse to seem so weak?

This was never an issue at PA plow day or mowing as i always i never had much weight on the tractor. Now that i am using my 450 blower i really struggle to back up my drive way. I would like to add more weight to the rear as the front end is still to heavy but im afraid it will make reverse totally worthless.

Thanks in advance John.

[J-Mech]

Any worn linkage can make the pump seem "weak". Replace as necessary.

I find it interesting that you replaced the pump, yet it stayed the same. I'm no rocket scientist, but I would think that is a good indication that the linkage may be worn out, or out of adjustment.

[olds45512]

Sounds like a linkage issue to me, if it's wore or out of adjustment then it's probably not moving the trunion enough.

[Terry C]

Run it with the tunnel cover off, and while in reverse push the trunion with your hand and see if it helps.
Then you will know if it's the linkage

[John147]

Originally Posted by J-Mech

Any worn linkage can make the pump seem "weak". Replace as necessary.

I find it interesting that you replaced the pump, yet it stayed the same. I'm no rocket scientist, but I would think that is a good indication that the linkage may be worn out, or out of adjustment.

I replaced the pump due to the spiral pin hole being worn so it was mainly an observation i had. Is there a DIY on removing the spring from the trunion so i can weld and file the corners.

[Workinprogress]

One item I had my 1512 was the throttle cable Catching the hydro arm under the dash.. I would suggest removing the tunnel cover and examining everything as you move the hydro speed lever full speed forward and full speed reverse. Look for anything hitting or rubbing.

[Dirty Steve]

"Is there a DIY on removing the spring from the trunion so i can weld and file the corners. "

Bet that is a lot of your issue. Post some pictures of the trunion.

Does the hydro creep when the foot pedal is fully depressed? (Wheels turn forward or backward? More whine from the pump?)

If so, Bracket Assy, Cam Pivot (#7 on the Cub Cadet site parts look up) can be adjusted up and down per the service manual.

[John147]

Thanks everyone for the advice.

I checked my throttle cable today it's free and clear of any obstructions. The ball joints have a lot of side to side slop to i ordered a set from cub hopefully they will be here by Friday.

I am going to yank the fender pan either later tonight or sometime this week and i am going to get pics. I adjusted the rod between the hydro lever and the pump as i replaced that as i bent it doing the drive line rebuild. I am going to have to look up how to adjust the other plate though i'm sure it's out as with the lever full forward / backwards it never uses full movement in those slots

Hopefully i can get this fixed before i order a rear cat 0 weight bracket and load lock from Xtreme. I am planning on using 4 42 pound JD weights on the back to hopefully lighten the steering with the blower on.

[John147]

I decided to go out and take the fender off the trunion looks a lot better then i thought but the spring is very loose is this normal? Also the plate the the rod attaches to is very loose and sloppy i am assuming this is also an issue anyone have anyway to tighten this assembly up?





This plate is very loose feeling.

[Jibber]

I came across this service bulletin in a folder of things I have. May not be the issue but definitely worth checking.