610 Bobcat hydralic leak just under jackshaft/Belt drive

[rsellnow]

There is a small hole about 1 inch under drive belt/jackshaft bearing. It leaks out hydralic fluid from the left side resorvoir. The hole is about 3/8 in size and I belive it is threaded. Only way to get up to it is from underneath. What is this hole for as it leads a trail of fluid whem I'm using it? Is it normal to use Dextron 2 type of hydralic oil? I think because he used it in the winter. That is what was in it, not regular Hydralic oil. This unit was purchased in the 70's and my father died suddenly, so I have no answers as to why things are the way they are. It has 2463 hours and orginal tires and motor. I can remember helping install points and plugs years ago. Things work great except for leak.

 

[6brnorma]

Is the hole about an inch forward of or behind the jackshaft itself as well as below? If so I'm pretty sure you're talking about one of the 4 bolt holes used to secure the pillow block for the jackshaft bearing. If that is it......it is not threaded and will require reinstallation through the side panel and probably loosening of several of the chains.

 

[rsellnow]

Is the hole about an inch forward of or behind the jackshaft itself as well as below? If so I'm pretty sure you're talking about one of the 4 bolt holes used to secure the pillow block for the jackshaft bearing. If that is it......it is not threaded and will require reinstallation through the side panel and probably loosening of several of the chains.

The hole is right below the jackshaft looking up from underneath. Not front or back. Don't hear any funny chain noise. My son plowed snow with it this winter and seemed to work good. Just leaked bad when in use. Thanks

 

[6brnorma]

The hole is right below the jackshaft looking up from underneath. Not front or back. Don't hear any funny chain noise. My son plowed snow with it this winter and seemed to work good. Just leaked bad when in use. Thanks

Hmmm....well, let's double check. As I understand you....we are talking about the upper jackshaft that carries the driven sheave and main drive belt. 1 inch below the shaft itself, left side of machine, which would place the hole in the reservoir/body of the machine and behind the driven/jackshaft sheave. If that is correct....there are only 4 bolt holes there on any of the three machines I just looked at. If all four bolts are present in that location then I'm at a loss and someone else will need to jump in. 1 inch below the shaft would put it into the bearing housing so I don't know what purpose it would serve. Missing one bolt would not necessarily equal chain noise....I have found everything from cotter pins to well preserved crank shafts in the bottom of those reservoirs on machines that were running just fine. Picture would help but it sounds like NASA is cutting back on that stuff.

 

[rsellnow]

Hmmm....well, let's double check. As I understand you....we are talking about the upper jackshaft that carries the driven sheave and main drive belt. 1 inch below the shaft itself, left side of machine, which would place the hole in the reservoir/body of the machine and behind the driven/jackshaft sheave. If that is correct....there are only 4 bolt holes there on any of the three machines I just looked at. If all four bolts are present in that location then I'm at a loss and someone else will need to jump in. 1 inch below the shaft would put it into the bearing housing so I don't know what purpose it would serve. Missing one bolt would not necessarily equal chain noise....I have found everything from cotter pins to well preserved crank shafts in the bottom of those reservoirs on machines that were running just fine. Picture would help but it sounds like NASA is cutting back on that stuff.

we are talking about the upper jackshaft that carries the driven sheave and main drive belt. 1 inch below the shaft itself, left side of machine, which would place the hole in the reservoir/body of the machine. This part is correct... The hole might even be only a 1/2 inch below jackshaft...So I'm think'n a bolt that holds the jackshaft bearing on. I don't think Dad ever did maintenance on the chain drives. Not much of mechanic, took things in for repair only when he had too. Let's start again...do you have access to diagram?... Looking up from bottom rear. Slide in head first, Jackshaft on right ( left side sitting on seat ) connecting to splice to change Alternator belt. Hole just below jackshaft about 1/2 to 1 inch right below.... Any how I was home late tonight. I can call you, but machine is over on family farm. I only get over their on weekends. I'm in Brainerd and 610 is in Verndale. maybe I can get my kid to to use his cell phone camera. He's an electrian and very tired in this heat...I'll check back again tomorrow Thanks

 

[rsellnow]

we are talking about the upper jackshaft that carries the driven sheave and main drive belt. 1 inch below the shaft itself, left side of machine, which would place the hole in the reservoir/body of the machine. This part is correct... The hole might even be only a 1/2 inch below jackshaft...So I'm think'n a bolt that holds the jackshaft bearing on. I don't think Dad ever did maintenance on the chain drives. Not much of mechanic, took things in for repair only when he had too. Let's start again...do you have access to diagram?... Looking up from bottom rear. Slide in head first, Jackshaft on right ( left side sitting on seat ) connecting to splice to change Alternator belt. Hole just below jackshaft about 1/2 to 1 inch right below.... Any how I was home late tonight. I can call you, but machine is over on family farm. I only get over their on weekends. I'm in Brainerd and 610 is in Verndale. maybe I can get my kid to to use his cell phone camera. He's an electrian and very tired in this heat...I'll check back again tomorrow Thanks

If this helps, I found a thread from year 2006 I think it was that explained same problem as me. I emailed guy Sat, but have yet to hear from him. Probably doesn't check any more.

 

[rsellnow]

If this helps, I found a thread from year 2006 I think it was that explained same problem as me. I emailed guy Sat, but have yet to hear from him. Probably doesn't check any more.

Any one have access to a diagram?

 

[6brnorma]

Any one have access to a diagram?

I am sure 'old machinist' would be happy to post a diagram, however, I have several manuals and have searched each and I can not find a single diagram that clearly shows the detail of the area you are speaking of on the body sidewall. Unless he has something I don't there is nothing for him to post. I also reread all of the archived posts back to 2005 and I'm sorry but I only found one similar to yours.... it was a Nov. 2006 thread started by 'Hondaman' titled "Can you identify this leak". He posted a pic but it was of a leak in the body below the steering handle not below the 'jackshaft'. Maybe you could identify the thread you are referring to and that might give someone a better idea. If no one is able to help you, personally, my next step would be to remove the viewing panel and see if there is something inside that would indicate why it is there. It only takes a couple of minutes with a pneumatic wrench. Lots of things you should check in there anyway.... chain tension, wear on gears, metal in bottom of reservoir, steering arm shaft backing into chain, clutch liners, etc.

 

[rsellnow]

I am sure 'old machinist' would be happy to post a diagram, however, I have several manuals and have searched each and I can not find a single diagram that clearly shows the detail of the area you are speaking of on the body sidewall. Unless he has something I don't there is nothing for him to post. I also reread all of the archived posts back to 2005 and I'm sorry but I only found one similar to yours.... it was a Nov. 2006 thread started by 'Hondaman' titled "Can you identify this leak". He posted a pic but it was of a leak in the body below the steering handle not below the 'jackshaft'. Maybe you could identify the thread you are referring to and that might give someone a better idea. If no one is able to help you, personally, my next step would be to remove the viewing panel and see if there is something inside that would indicate why it is there. It only takes a couple of minutes with a pneumatic wrench. Lots of things you should check in there anyway.... chain tension, wear on gears, metal in bottom of reservoir, steering arm shaft backing into chain, clutch liners, etc.

I took a picture of hole looking up from below. It clearly shows drive belt and 2 bottom bolts holding bearing for jack shaft. I have put a red plug in hole so anyone can see it. You will see wheel bearing on bottom of picture and belt drive on left and Red plug in hole. I can't attach picture. Is there a website I can post picture too?