steve931
Active Member
I am having problems with brake pressure on a J.Deere 644D.I have 2800 lb,s of pressure at the unloader block but I am losing it somewhere between the accumalator and foot valve.,any idea will be helpful. Thank,s Steve931:usa
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644D Brakes
- Thread starter steve931
- Start date
Countryboy
Senior Member
- Joined
- Jun 8, 2006
- Messages
- 3,276
- Location
- Georgia
- Occupation
- Load Out Tech. / Heavy Equipment Operator / Locomo
Welcome to HEF steve931! :drinkup
steve931
Active Member
Thank,s:usa
surfer-joe
Senior Member
If it isn't leaking externally, which would be highly visable, then it may be leaking internally at one of the brake applicators and then be flowing into the axle housing, or into one of the planetary housings and then back into the axle housing.
It may be bypassing at the foot valve right back over to the return side and back to reservoir.
I do not have any specific ideas as have never had to work on this model, but it's not hard to check the possibilities I listed as an easy 1st or 2nd step in trouble-shooting.
Good Luck!
It may be bypassing at the foot valve right back over to the return side and back to reservoir.
I do not have any specific ideas as have never had to work on this model, but it's not hard to check the possibilities I listed as an easy 1st or 2nd step in trouble-shooting.
Good Luck!
steve931
Active Member
Brakes 644D
Thank you very much for your reply.The foot valve seems to be working properly,I am not building enough pressure to the foot valve,I will put your suggestion in my notes,I think I might have a priority valve issue. I will let you know, again thank you for your time.:usa
Thank you very much for your reply.The foot valve seems to be working properly,I am not building enough pressure to the foot valve,I will put your suggestion in my notes,I think I might have a priority valve issue. I will let you know, again thank you for your time.:usa
steve931
Active Member
Found 644 brake problem
After beating my head on the wall for a few weeks I finally found a bad relief valve.The valve was stuck open therefore letting the fluid run in circles.Thank,s for any replies.Steve931:usa
After beating my head on the wall for a few weeks I finally found a bad relief valve.The valve was stuck open therefore letting the fluid run in circles.Thank,s for any replies.Steve931:usa