743 wont move

[willett]

Hi, I have an old 743. I can get the boom and tilt working but when I try to travel either side in either direction the pump starts wailing and it will stall the engine if i dont let off. I drove it onto my trailer a week ago down in vancouver where it is much warmer and above freezing and towed it up the interior of bc where i live and it has been below freezing since I brought the machine here. The machine sat for a number of years before I acquired it. Is there any way that the park brake could freeze on if there is water in the chain case? I have completely removed the park brake linkage and pryed the pedal all the way towards the back of the machine. Currently I have a magnetic heater on the chain case, I'm hoping something froze up in there but it's really just a crap shoot. Unfortunately my shop isn't big enough to stick the trailer and machine in the heat. Anybody have any other ideas? Are there any safetys to lock out travel that I'm overlooking here? Thanks Spencer

 

[flyerdan]

All indications are pointing to water in the chaincases freezing up. 743 is one of the least nanny-state stumbling blocks to keep you from using it machines out there that's still widely used, so it's very unlikely to be something like that.

 

[bobcat743b]

All indications are pointing to water in the chaincases freezing up. 743 is one of the least nanny-state stumbling blocks to keep you from using it machines out there that's still widely used, so it's very unlikely to be something like that.

I think maybe you need to check in your hydraulic system for water. seems unlikely you would have enough water in the drive case as there sealed pretty well. if you have water in your hydraulics it will stop the flow and when you do that the motor will stall out. maybe you can fine one of those large kerosene heaters with blower to get some heat on it or pull it off your trailer and try to get it inside a building.

 

[willett]

I think maybe you need to check in your hydraulic system for water. seems unlikely you would have enough water in the drive case as there sealed pretty well. if you have water in your hydraulics it will stop the flow and when you do that the motor will stall out. maybe you can fine one of those large kerosene heaters with blower to get some heat on it or pull it off your trailer and try to get it inside a building.

Are there any case drain or pilot filters under the cab of this thing?

 

[willett]

Are there any case drain or pilot filters under the cab of this thing?

Got it moving. Had a magnetic heater on the chain case for 24 hrs and temps have been just above freezing for the last day as well. I put a new hydraulic filter on and when I tried moving it today there was very slight movement in the wheels. I gently rocked it back and forth for a bit and it slowly started freeing up. Still not really sure what the problem was but seems like there was ice somewhere. Maybe the park brake was frozen on. I have no idea. It's in my heated shop now though. Next question: is there a drain on the bottom of the chain case or does it need to be sucked out

 

[bobcat743b]

Got it moving. Had a magnetic heater on the chain case for 24 hrs and temps have been just above freezing for the last day as well. I put a new hydraulic filter on and when I tried moving it today there was very slight movement in the wheels. I gently rocked it back and forth for a bit and it slowly started freeing up. Still not really sure what the problem was but seems like there was ice somewhere. Maybe the park brake was frozen on. I have no idea. It's in my heated shop now though. Next question: is there a drain on the bottom of the chain case or does it need to be sucked out

not really sure where your drains are for your hyd tank or chain case but oil will float on water so its lighter, you can loosen your drain until you see something starting to seep. if its water you will no quickly. I checked my hyd reservoir on my case last summer and there was some water but not much. probably couple table spoons. glad you got it to move.

 

[willett]

not really sure where your drains are for your hyd tank or chain case but oil will float on water so its lighter, you can loosen your drain until you see something starting to seep. if its water you will no quickly. I checked my hyd reservoir on my case last summer and there was some water but not much. probably couple table spoons. glad you got it to move.

Pulled drain plug, chaincase is a block of ice. Mystery solved. Hopefully I didn't lose any seals

 

[bobcat743b]

Pulled drain plug, chaincase is a block of ice. Mystery solved. Hopefully I didn't lose any seals

glad you found the problem but I have a 743b and am trying to figure out how you had all the water in there. I checked my case couple weeks ago and just oil came out. just curious

 

[willett]

glad you found the problem but I have a 743b and am trying to figure out how you had all the water in there. I checked my case couple weeks ago and just oil came out. just curious

No idea where all the water came from. I ended up drilling a drain hole and tapping it to 1/2 NPT on the face of the case below the level plug. All told I took 90L of **** and corruption out of there. My understanding that the chaincase is supposed to take 30L? Can anybody confirm?

 

[bobcat743b]

No idea where all the water came from. I ended up drilling a drain hole and tapping it to 1/2 NPT on the face of the case below the level plug. All told I took 90L of **** and corruption out of there. My understanding that the chaincase is supposed to take 30L? Can anybody confirm?

10w30 is fine but if you took 90 liters out then theres definitely a problem as I think it takes 9 gallons of oil to fill it. 90 liters I think is 23 gal of oil. surely some one on here might have an idea how all the water might of got in there. ive looked at mine and cant see how any water would get in there.