This is a rare old machine, and I have a problem that I one seems to have seen before. Maybe someone has run into this. I hope you can help me with this. About a month ago we had an IT40B that had the transmission seized in forward. It would shift into reverse, but stall the engine if you let out on the clutch. Turns out that the F gear on the main shaft, which spin on some type of collar "bearing" had heated up and bound to the shaft, bearing and gear. This shaft is at the top of the transmission and even though there was plenty of gear oil, it had water in it from a failed shift boot. Thinking the contaminated oil caused the failure, we bead blasted the parts after getting them apart, polished- honed and reassembled. The truck ran less than two hours and had the same failure again. Now I'm wondering:
*What really caused the first failure.
*How do I avoid another repeat??
Any ideas ?
Clark IT50B
SN: IT355-25-3355 (8/76)
Showing items 1 - 8 of 8 results.
Might be onto something. Have always run gear oil. Will dig out of my books and check.
What kind of oil does this style take? I would think that standard gear lube would be too heavy? Maybe ATF?
I've had a couple of these apart over the years and I remember the style " bearing" you saw in the pics. The inside is splined to match the shaft. Bet a needle bearing would work better.
Got your pics- I'd lay money that the bushing in your picture was made to replace a needle bearing. I'd check with your local clark dealer to see if they can get you an exploded view of that trans. I've never seen a bushing in that application- always a needle bearing of some sort.
I agree, gotta be more to the story. This gear has three holes in the valley that let oil drop onto the "bearing". Customer purchased the machine 8-10 months ago. We fixed several small issues after purchase, including servicing the manual transmission. The shift boot was torn and NA from Clark. I located two boots during our first repair and installed one on this machine and another IT40B they own. Customer fabricates trailers, level gravel yard. Normal 22 YO operator abusers!
Send email if you **** and I can pass you some pictures?
I can picture the sleeve you describe. The IT40 I work on has both speed & direction thru the shifter tower- both actuated by a single stick (3 forward, 1 reverse).
Is this a new customer? Is this a new unit for your customer? Has the usage changed for this unit? What oil is in the trans & where do you have the oil level set at?
Can you raise the drive wheels off the floor & run unit in gear with the shift tower removed to check flow pattern of oil?
If the unit is designed with this sleeve- there must be more at play for it to fail.
BBF
The gear and bearing were heat welded together both times. There is a shift tower for the speed selector but the F/R comes in through the side of the case to operate the shift fork. The interesting thing is that the gear does not run on a needle bearing. Imagine a steel sleeve with several relief grooves machined longitudinal. Wish I could post a picture here.
What condition is the shift tower in? Try removing tower & -using a pry bar- moving the shifting forks manually.
I had one that a previous repair company had condemned the trans only to find out the shifter tower had failed.
How often is the truck used- is rust a factor? Were the parts rusted together or were they "heat welded" together?
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