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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

D6C Pulling Problems

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bent3

12-09-2006 12:15:09




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I have a Cat D6C when you run it for about an hour the transmission is kindly hard to take gear sometimes i have to back it up before it will go foward then it works good taking gear but it will just barely move I have cleaned the magnetic filter and had the transmission out and went threw it any help anyone has i would appreciate it




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bent3

12-10-2006 17:27:40




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 Re: D6C Pulling Problems in reply to bent3, 12-09-2006 12:15:09  
It looks like i am having the same trouble that Allen Morris had in febuary of 2005 if anyone knows what fixed his problem may be the same wrong with my dozer



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Bob/Ont

12-11-2006 07:43:15




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 Re: D6C Pulling Problems in reply to bent3, 12-10-2006 17:27:40  
Need to do a pressure test Bent. I think you are loseing pump flow. Might be a worn pump or the seals on the tube going into the trans valve at the rh rear corner of the top of the trans.
Later Bob



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bent3

12-11-2006 14:42:35




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 Re: D6C Pulling Problems in reply to Bob/Ont, 12-11-2006 07:43:15  
I put new seals in that tube you are talking about last week when i had the trans out how much pressure should it have and where do i check it at? could the rubber lines that join the metal lines be lose and causing it to suck air?



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Bob/Ont

12-11-2006 15:11:39




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 Re: D6C Pulling Problems in reply to bent3, 12-11-2006 14:42:35  
Yes they could be and the pump will sound like it is full of marbels. If you could get a gauge and hose with a 9/16NF thread fitting put it in the filter top and check the pump pressure with warm oil at high and low idle in neutral. Should get 350 or 400 PSI depending on serial #. Check at low idle in every gear and pull steering levers one at a time then see what you get. Write them down and come on back. Use a 600 PSI gauge. This is a fast and dirty pressure test but will tell you a lot.
Later Bob

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bent3

12-12-2006 15:06:48




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 Re: D6C Pulling Problems in reply to Bob/Ont, 12-11-2006 15:11:39  
Bob I put new hoses on it today the one coming from the pump to the magnetic filter when i losened the bolts on the flange the hose would turn so i replaced all of them and i was going to check the pressure but my filer tops do not have any place to screw anything into them i ran it for about 30 minutes digging stumps and everything seemed to work good it was a little hard to steer to the left had to use alot of brake but other that that. before when i was digging stumps i could get agains one and it would just sit there then i could go backwards and fowards a couple of times it then go into the stump again and it would spin the tracks thanks again i appreciate any help you may have

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Bob/Ont

12-12-2006 15:56:30




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 Re: D6C Pulling Problems in reply to bent3, 12-12-2006 15:06:48  
I think you likely have it now Bent. Does your Torque Temp gauge work? That will tell you if things are okay. Now about the steering. If you don't have a winch on the back take off the round plate and check the bevelgear bearings. Put a prybar behind the bevelgear and check for any side to side movement. If it moves the bearings are on the way out. I think they might be and the seals in the steering clutch flange that hold the steering release oil are likely leaking or blown out. That is a big job you can still work that way but listen for any noise back there.
Later Bob

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bent3

12-12-2006 19:20:42




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 Re: D6C Pulling Problems in reply to Bob/Ont, 12-12-2006 15:56:30  
The Torque gauge works fine it came up about 1/4 inch. caterpillar just redone the steering clutches in both sides and the final drives. is it possible that they just need adjusted. if the seals were blowed wouldnt the trans oil leak into the final drives? I do have a winch on the back i had the trans out last week everything seemed to be fine in the beval gear i didnt see anything that looked worn. i also have a little bit of a oil leak i noticed today on top of the steering clutch cover under the seat. do you think i may have fixed the pulling problem. i dont hear any unusal noises coming from the rear end

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Bob/Ont

12-13-2006 07:39:31




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 Re: D6C Pulling Problems in reply to bent3, 12-12-2006 19:20:42  
Bent, you may need to adjust the linkage rods to the steering valve. Take the pins out, pull back on the linkage rods and push the levers on the valve forward untill you feel them make contact inside. The pins should just slide back into the holes freely. You want the linkage to hold the levers close but not pushing on the valves inside with the steering levers forward. If the hard steering side has a linkage that is too long that would reduce your clutch release pressure. The seals I was talking about are in the inner clutch flange, the ones that keep the trans oil out of the final drives are dou cone seals in the pinion flanges to the out side of the clutches. If they had the clutches out they would likely have checked the bevelgear shaft bearings. Keep an eye on the torque temp gauge. If the tractor drives good and temp stays out of the red everything is okay

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bent3

12-15-2006 15:30:32




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 Re: D6C Pulling Problems in reply to Bob/Ont, 12-13-2006 07:39:31  
bob i still havent got to run the dozer like i want to but i did test the pressure today their was a hose hooked in to the back of the pump and came up to the dash where the trand gauge should be it was plugged oss but when i started it it tested 300 idle 400 wide open when it got got hot it checked 180 idle 300 wide open it dropped about 10 when you pulled the steering clutces back and when you put it in gear it dropped 10 and then came right back up when it started moving in all gears foward and reverse. The two plugs in the top of trans should i check them and if i should what will check at it is a 76a5790 d6c so far it has worked fine but i have only worked it for about an hour each time itwill steer without using the brakes maybe the brakes just need set up i also noticed that one of the brake rods was bent that may be it thanks again for your time and help

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Bob/Ont

12-15-2006 17:26:59




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 Re: D6C Pulling Problems in reply to bent3, 12-15-2006 15:30:32  
Bent, I like to see only 10% drop from high to low idle. That would be 40 PSI and you have 100 PSI drop, 120 when hot. If it only drops 10 more when steering the bevelgear bearings and steering seals are okay. The drop when you go into gear is the clutches filling. The time it takes to come back up fully is the Modulation time to engage the clutch with out jerking. If you don't mind the work pull the trans pump off and open it up. I think it might be worn inside, end plates maybe.
Try emailing again and send a pic of pump parts if you can.
Later Bob

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bent3

12-15-2006 19:22:27




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 Re: D6C Pulling Problems in reply to Bob/Ont, 12-15-2006 17:26:59  
I thought that was quite a pressure drop it may be a feww days before i can take the pump off how is the best was to contact you one time you e-mail didnt go thru. thanks again



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Bob/Ont

12-18-2006 08:43:16




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 Re: D6C Pulling Problems in reply to bent3, 12-15-2006 19:22:27  
Bent try the phone # in other post if you are in North America. Or post your email here and I will try gettint through from this end. Type "AT" instead of @ to foil automatic Email scoopers
Later Bob



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Bob/Ont

12-09-2006 18:02:59




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 Re: D6C Pulling Problems in reply to bent3, 12-09-2006 12:15:09  
What did you clean out of the magnetic screen? I get the feeling you mean you put it into gear and it doesn't move??? Does the shift lever tend to come back to neutral at low idle. How does it steer, easy or take a lot of force on the brake peddal? Email me if you like.
Later Bob



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bent3

12-10-2006 12:32:35




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 Re: D6C Pulling Problems in reply to Bob/Ont, 12-09-2006 18:02:59  
Bob did you get mt email



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Bob/Ont

12-16-2006 20:59:35




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 Re: D6C Pulling Problems in reply to bent3, 12-10-2006 12:32:35  
Bent. Call Me at 905 884 0564 after 6 PM your time to get best rate. Email isn't working too good right now.
Later Bob



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big hunter

12-09-2006 13:30:50




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 Re: D6C Pulling Problems in reply to bent3, 12-09-2006 12:15:09  
I had a john deere 550 and before I bought it somebody ran it into a swamp/water. the water in the oil made the clutches come apart. went in gear fine but it went slower in 3rd then 2nd and didn't move at all in 4th. had to tear it apart and replace the clutches clean it out andrefill with good oil



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