955H Aux for backhoe:

Hi,
I have a 955H, S/N 60A10479 which I purchased a few years ago. I am trying to get the aux shaft to work but can’t seem to get it into gear. When I purchased the loader it was equipped with a backhoe (Hyster Model 6551, Group 1555 E). The hoses were bad so I let it sit until now. After replacing the bad hoses I can’t get the hydraulic pump to work which is connected with a shaft to what looks like a PTO.

When I first got the machine I verified that the PTO did turn when it was engaged. I removed the pump so I could see the shaft. It didn’t go in at first, I remember trying every combination I could think of. I tried it in forward, reverse and neutral until it finally did grind a little then go in (I should have written down what I did 😊 since I can’t remember exactly what worked. I could see the yoke turning (where the drive shaft from the pump went into). It stopped when I took it out of gear so I assumed everything was ok.

Now that I have the backhoe attached, it doesn’t want to go into gear. It has been a couple of years so I figured it was stuck so worked it back and forth. Eventually it did seem to break loose but still didn’t seem to do anything. I tried putting it into gear and it started to grind but wouldn’t go in. I didn’t want to force it so shut down the motor and put a little pressure on it as the engine slowed down. It felt like it slipped right in so thought I had it. When I started the engine back up it still didn’t work.

Is there a combination I am missing? The lever is on the right side of the operators seat, pulls up to engage. Any help would be appreciated.
Thanks,
Gary Thompson
[email protected]

There is an interlock on the range transmission shifter that requires unit be in neutral when attempting to engage. If the interlock were out of engagement position you would not be able to couple the drive. Other possibility is the shifter detent mechanism and/or the sliding gear may be stuck due to lack of use.

Is the interlock on the shifter on the side of the transmission where the linkage connects? I was about to drop the belly pan to check the linkage but haven't done that yet. The detents where you shift the transmission, 1-2 forward & 1-2 reverse seem ok, I can always tell when it shifts.
Gary

If my memeory serves me correctly, the PTO on the 955H will only drive when the machine is moving or when the range transmission, (the lever below the seat on the right) is in neutral position, so to drive the back hoe it has to be in neutral with a few revs on since it drives through the torque converter and is susceptible to load. we found out this when fitting a timber winch to a 955H, it could not be used unless the range transmission was in neutral.

The interlock is the shaft directly above the shift lever and controls the detent plunger from the backside and locks the plunger in the notches of the shifter fork when the power shift transmission is engaged. If you are getting the detent position action it must be ok. Shifting should only be able to occur when the power shift is in neutral.

Yes, as catsilver states you will be in the neutral position when driving a stationary item like winch or backhoe.

May sound odd but the PTO countershaft is driven by a constant mesh gear train that turns as long as the transmission output shaft rotates. It's just the speed of the drive pinion that changes with range selection.