Weird GST shift action - issue or no biggie?

Jay4200 · Jul 18, 2014

I had a weird delayed shift with my L4200GST - it only happened once, and I don't think it's a big deal, but with the 2700 hours on the tractor, you never know. I was pulling a gauge-wheeled landscape rake on my driveway - I was admittedly getting antsy and pushing too fast, cruising along in 5th on a flat, but pulling a decent pile of stuff on the rake so the tractor was under a load. I did a no-clutch bump into 6th (first road gear) and nothing happened - no shift. There was a good 5 second delay or better, than **FOOM** the shift happened. It startled me and I dropped it right back down into 5th, which shifted immediately, and nothing bad happened after, but it still made me nervous. I figured that the tranny was under load, which bound the old gear until there was a slight break in the load, allowing the shift to happen. I don't know what is in a GST transmission or how one works, but it seems plausible. Sound OK?

KennyV · Jul 19, 2014

Sounds Normal... an up shift with a load while the trans is changing ranges, will involve a delay while the pressures in the GST adjust to operate the hydraulic clutch And then the gear changes...

skyhook · Jul 20, 2014

Sounds normal to me also, it's when it doesn't shift at all, you start to wonder...

Jay, I've been looking at one of your old thread's,,

http://www.tractorbynet.com/forums/...egarding-use-backhoe-hyd.html?highlight=L4200

I will be 'resurrecting it, if you don't mind, I'm installing a hoe on my machine and
will need some advice on where to hook up the lines for it.

I see you have the same set-up, so your input will be appreciated.

Jay4200 · Jul 21, 2014

KennyV said:
Sounds Normal... an up shift with a load while the trans is changing ranges, will involve a delay while the pressures in the GST adjust to operate the hydraulic clutch And then the gear changes...

'K - thanks. It was the length of the delay that had me concerned - like 5+ seconds or so. I was beating on it. Also, performed sacrilege and got a BX today. It's just SO bitty...

Jay4200 · Jul 21, 2014

skyhook said:
I will be 'resurrecting it, if you don't mind, I'm installing a hoe on my machine and
will need some advice on where to hook up the lines for it.
I see you have the same set-up, so your input will be appreciated.

My original setup was just loader and 'hoe. There was a quick connect at the loader that either ported the power beyond output either to the 3pt hitch or to the 'hoe. The backhoe is plumbed 2-line only - pressure in and return to sump. The 3pt is disabled while the hoe is connected. Hope this helps.