IT 28f lost in reverse, reverse slips to forward

Hello seniors...am electrotechnician working on IT28F with sn: 3CL00681. It's secondhand just imported and it came with the reverse problem...I've been working on it since yesterday and it's a little tricky. I read hear a couple of similar problems without an outstanding conclusion. I swapped the reverse solenoide with the forward low, had no movement still but when I swapped the valves it transfers only to reverse, no forward movement. So I thought it was an electrovan problem.today I bought a new electrovan and installed in the reverse slot but still had thesame problem(no reverse)...later today I completely lost both reverse and forward signals ...So am confused...I need your help.thank

Again I searched for the ECM and ET slot to no avail...does this machine even have an ECM? Nwufor said: Hello seniors...am electrotechnician working on IT28F with sn: 3CL00681. It's secondhand just imported and it came with the reverse problem...I've been working on it since yesterday and it's a little tricky. I read hear a couple of similar problems without an outstanding conclusion. I swapped the reverse solenoide with the forward low, had no movement still but when I swapped the valves it transfers only to reverse, no forward movement. So I thought it was an electrovan problem.today I bought a new electrovan and installed in the reverse slot but still had thesame problem(no reverse)...later today I completely lost both reverse and forward signals ...So am confused...I need your help.thank Click to expand...

Pull the suction screen from the front of the transfer case and inspect it for burnt clutch material before proceeding further. That should really have been your first move. No ET on those machines. You know how to iuse a Click Box.?

No sir.. Nige said: Pull the suction screen from the front of the transfer case and inspect it for burnt clutch material before proceeding further. That should really have been your first move. No ET on those machines. You know how to iuse a Click Box.? Click to expand... What's a click box?

Nige said: Pull the suction screen from the front of the transfer case and inspect it for burnt clutch material before proceeding further. That should really have been your first move. No ET on those machines. You know how to iuse a Click Box.? Click to expand... I thought about that too...what diversed my attention was the fact that when I exchanged the valves forward low to reverse its changed and could only move in reverse but no forward.and when I swap them back it goes on reverse only.

Nwufor said: I thought about that too...what diversed my attention was the fact that when I exchanged the valves forward low to reverse its changed and could only move in reverse but no forward.and when I swap them back it goes on reverse only. Click to expand... Get into the suction screen first. You need to know if there is a mechanical problem with a (clutch or clutches) Nwufor said: What's a click box? Click to expand... Educate yourself. The famous Cat "Click Box" It is a regular event on HEF for someone to post a question regarding Cat machine electronics, Diagnostic Codes, etc. For a large number of the questions posted the answer(s) revolve around the famous Cat “Click Box”, otherwise known as the 4C-8195 Control Service Tool. This tool usually hooks... www.heavyequipmentforums.com

Ok ...thank you sir....I'll get back to you soonest.... Again why did I lost both reverse and forward signals ...is there any possibility the entire valve group needs overhaul or some dirt blocked the spool...

Nwufor said: Again why did I lost both reverse and forward signals ...is there any possibility the entire valve group needs overhaul or some dirt blocked the spool... Click to expand... Possible. An inspection of the screen will tell you if there are any major mechanical defects in the clutches. If there are then the complete tranmission is comng out either way........

Is this what you mean by the screen?

That’s the one. Drain the transmission oil first or you will get a surprise when you remove the cover.

Nige said: That’s the one. Drain the transmission oil first or you will get a surprise when you remove the cover. Click to expand... Sorry, got that wrong. The magnetic strainer #13 screen and the screen #14 are behind a 3-bolt cover on the other side. Post photos of what you find.

Is this a 6y8243 box ? Did you find out whats wrong?