leaking axle seal on 773

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ilona_4

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Nov 5, 2005
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I got leaking axle seal, I wonder if that is expensive to fix. Is it going to cause any problems if I do not fix it right away?
 

Tazza

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I can't see that a small leak will cause any damage, just as long as you don't loose too much oil, as your chains and gears from your hydrostatic motors run in this oil bath.
Sit the machine on level ground, remove the plug in the front of the chain case, when it is full, the oil should just start to trickle out of this hole. if there is no oil coming out, you need to fill it some more.
As for replacing the seals, i have never tried this, but from what my manual shows, it will be a swine to do your self, and to get your dealer to do it i think you will be up for many hundreds :/
 

goodtech

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Nov 22, 2005
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The manuals says that as long as you can reach the oil with finger in the chain case it is at the correct level. the only down fall to this is if yu forget to check it, it can cause thousands of dollars in damage to your chains and sprockets, axles, axle housings, and axle bearing. It will not affect the hydrostatic motor itself, but it can damge the sprockets in the motor. They are relatively cheap. go down to the bobcat dealer by yourself the seal and the speedy sleeve. It comes in a kit and it is like around 30 dollars. Go home put you machine on jack stands. remove the tire that the seal is leaking on. remove the big bolt in the middle of the axle. take a slegde hammer and hit the back of the axle hub. This takes some hitting sometimes but you will eventually get trust me. drill a hole in your seal remove the seal. Now there is only two things that make those axles leak. 1) if your axle moves in or out, or if there is wire and shit stuffed into it. if your axle moves in or out you can go to the bobcat dealer and by an thicker washer to put in the chaincase. But let me know I can help you with that. But anyways clean up the axle area, see if it needs a speedy sleeve, if it does I believe its 2 1/2 exhaust pipe works great to put it on. then pack the back of the seal full of grease and install it. Make sure it stay even all the way around. We Have a tool at bobcat to make sure that they get installed even, but I have done it for years at my own place with out it also. intall your axle hub, blue loctite the bolt, intstall your tire and make sure to torque the wheels at 150 ft lbs. Good luck, it is alot easier than it sounds.
 

Tazza

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The manuals says that as long as you can reach the oil with finger in the chain case it is at the correct level. the only down fall to this is if yu forget to check it, it can cause thousands of dollars in damage to your chains and sprockets, axles, axle housings, and axle bearing. It will not affect the hydrostatic motor itself, but it can damge the sprockets in the motor. They are relatively cheap. go down to the bobcat dealer by yourself the seal and the speedy sleeve. It comes in a kit and it is like around 30 dollars. Go home put you machine on jack stands. remove the tire that the seal is leaking on. remove the big bolt in the middle of the axle. take a slegde hammer and hit the back of the axle hub. This takes some hitting sometimes but you will eventually get trust me. drill a hole in your seal remove the seal. Now there is only two things that make those axles leak. 1) if your axle moves in or out, or if there is wire and shit stuffed into it. if your axle moves in or out you can go to the bobcat dealer and by an thicker washer to put in the chaincase. But let me know I can help you with that. But anyways clean up the axle area, see if it needs a speedy sleeve, if it does I believe its 2 1/2 exhaust pipe works great to put it on. then pack the back of the seal full of grease and install it. Make sure it stay even all the way around. We Have a tool at bobcat to make sure that they get installed even, but I have done it for years at my own place with out it also. intall your axle hub, blue loctite the bolt, intstall your tire and make sure to torque the wheels at 150 ft lbs. Good luck, it is alot easier than it sounds.
I didn't realize it was so simple, does it also apply to a 743? I really want to replace my seals just to be sure i don't have any problems later on. As i will be stripping this thing almost rite down i would like to do any repairs that *may* need to be done while it is in bits.

It seems that the hubs are welded to the axles, but the manual says something about loosen the bolt in the end on the axle by turning the axle hub. Then it says to re-assemble tighten one bolt to 220-245 ft lbs and another one to 475-525 ft lbs. The only one that i know of is the one that holds the sprocket to the axle *shrugs* unless it is talking about the housing that holds the reduction gearing attached to the hydro motor.

ps. sorry for hijacking your post
 

Tazza

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I didn't realize it was so simple, does it also apply to a 743? I really want to replace my seals just to be sure i don't have any problems later on. As i will be stripping this thing almost rite down i would like to do any repairs that *may* need to be done while it is in bits.

It seems that the hubs are welded to the axles, but the manual says something about loosen the bolt in the end on the axle by turning the axle hub. Then it says to re-assemble tighten one bolt to 220-245 ft lbs and another one to 475-525 ft lbs. The only one that i know of is the one that holds the sprocket to the axle *shrugs* unless it is talking about the housing that holds the reduction gearing attached to the hydro motor.

ps. sorry for hijacking your post
After i posted i had a thought (yes i know, this is rare but it does sometimes happen) that must be what they refer to as a 2 piece axle, so that means mine can't be done that way, i will have to remove the entire axle to get to the seals.
They don't seem to leak so i am thinking i should just leave them alone......
Replacing them at a later date is still possible without an insane amount of effort and the consumption of LOTS of beer?
 

goodtech

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After i posted i had a thought (yes i know, this is rare but it does sometimes happen) that must be what they refer to as a 2 piece axle, so that means mine can't be done that way, i will have to remove the entire axle to get to the seals.
They don't seem to leak so i am thinking i should just leave them alone......
Replacing them at a later date is still possible without an insane amount of effort and the consumption of LOTS of beer?
Hey tazz you must have an older 743, in the later B's they came out with the two piece axles, which make life alot easier. In the one piece axles they are a dog. You have to remove your hydrostat and have arms like a monkey, they are damn near impossible to get the rears ones on and off. The last one I did from start to finish ended up around 20 hrs to remove the hydrostat and removing the axles to installing the axles and sprockets (by myself) it helps to have another person around. If you are into it that far, the seals are cheap, so it depends if you are going to hang on and run this unit? Good luck, because I already feel for ya if your going to do it.
 

Tazza

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Hey tazz you must have an older 743, in the later B's they came out with the two piece axles, which make life alot easier. In the one piece axles they are a dog. You have to remove your hydrostat and have arms like a monkey, they are damn near impossible to get the rears ones on and off. The last one I did from start to finish ended up around 20 hrs to remove the hydrostat and removing the axles to installing the axles and sprockets (by myself) it helps to have another person around. If you are into it that far, the seals are cheap, so it depends if you are going to hang on and run this unit? Good luck, because I already feel for ya if your going to do it.
Yeah, i'm going to keep this one. It will basically be fully re-built. I think i have thrown too much money at it already, but i think its worth it. It owes me about 7,500 so far plus a bit of paint. Then i will re-pin everything so that will be say 1-200 to get the pins and bushes hardened. As i am going to make them replaceable i will only need to do it once. After it wears knock the old bushes out and knock new ones in.
I have re-conditioned the engine and fuel system, new radiator core, new ram sticks all round (well after i machine the chrome bar). New pistons and gland nuts for the lift arm rams and i would like to do the same to the tilt ram.
I will be removing the main frame off the chain case, so i believe that will help with doing the axle seals as i will get better access its not a job i want to do when its all together. Help will not be a problem, i can get my old man to lend a hand. We know a guy that owns a bearing shop, i may see if he can match the bearings and seals, hopefully they are common.
I'm going to have to keep picture record of the progress, then i can show everyone here what a bobcat looks like fully pulled apart, its not a pretty sight :)
I'm doing the finishing touches to the “bob port”, its like a car port, but for bobcats. Once finished i will have space to put all the parts i remove, so then i can start striping him down.
What do you use to plug tube lines and hoses to prevent crap getting in? all i have are these small red plugs, but i can never get quite the rite size. As i will have like 20 hoses i would like to plug them to prevent any crap getting in, the only other way is use duct tape and rags to seal the ends, what do you suggest?
 

goodtech

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Nov 22, 2005
Messages
112
Yeah, i'm going to keep this one. It will basically be fully re-built. I think i have thrown too much money at it already, but i think its worth it. It owes me about 7,500 so far plus a bit of paint. Then i will re-pin everything so that will be say 1-200 to get the pins and bushes hardened. As i am going to make them replaceable i will only need to do it once. After it wears knock the old bushes out and knock new ones in.
I have re-conditioned the engine and fuel system, new radiator core, new ram sticks all round (well after i machine the chrome bar). New pistons and gland nuts for the lift arm rams and i would like to do the same to the tilt ram.
I will be removing the main frame off the chain case, so i believe that will help with doing the axle seals as i will get better access its not a job i want to do when its all together. Help will not be a problem, i can get my old man to lend a hand. We know a guy that owns a bearing shop, i may see if he can match the bearings and seals, hopefully they are common.
I'm going to have to keep picture record of the progress, then i can show everyone here what a bobcat looks like fully pulled apart, its not a pretty sight :)
I'm doing the finishing touches to the “bob port”, its like a car port, but for bobcats. Once finished i will have space to put all the parts i remove, so then i can start striping him down.
What do you use to plug tube lines and hoses to prevent crap getting in? all i have are these small red plugs, but i can never get quite the rite size. As i will have like 20 hoses i would like to plug them to prevent any crap getting in, the only other way is use duct tape and rags to seal the ends, what do you suggest?
Well after being in the industry know for more then a couple of years, I finally had to break down and go buy Jic plugs and caps, otherwise I did the rag and duct tape thing also when I started. I will have to see if I can find some pic for you in a machine that I had to completly tear down to nothing. The hydrostat took a dump, and it went through everything, cyclinders, drive motors, all the hoses had to be taken off and replaced, that unit was bare when I was done with it. they are neat to see that far apart, but what alot of work.
 

Tazza

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Well after being in the industry know for more then a couple of years, I finally had to break down and go buy Jic plugs and caps, otherwise I did the rag and duct tape thing also when I started. I will have to see if I can find some pic for you in a machine that I had to completly tear down to nothing. The hydrostat took a dump, and it went through everything, cyclinders, drive motors, all the hoses had to be taken off and replaced, that unit was bare when I was done with it. they are neat to see that far apart, but what alot of work.
I would be most interested in the piccies.
I am considering making some JIC plugs and buying some caps, but i think for the effort i should just go buy them. The plugs would be fairly easy to make on the lathe, it would just take too long.
 
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