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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

John Deere Hoe brakes OUCH!!!

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exdynahoeman

09-30-2004 16:26:52




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This is the first backhoe I have owned with brakes, so that in itself is a plus. It is a 1981 JD 500C backhoe loader. However, when I apply the brakes at low or high speeds even gently the machine stops fine with no grinding or other noise but the pedal bounces back up against my foot so hard it feels like I'm going to break my ankle. Any idea what could cause this?? Also, this machine has no emergency brake?? or should it be working when I put it in park?? Last, could someone please tell me where can I buy a good troubleshooting and repair manual, not another parts list. Thank you!!

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Jonathan in MA

09-30-2004 17:35:24




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 Re: John Deere Hoe brakes OUCH!!! in reply to exdynahoeman, 09-30-2004 16:26:52  
The 500C is similar to a 510 backhoe. It has power brakes...which are totally different than the brakes in the 410 etc..Instead of using a master cylinder type brake , the 500c uses pump pressure oil (approx. 2300 psi at full pressure) to apply the brakes. They do tend to "bounce" your foot when they apply...but unsure if thats what youre feeling or theres a problem ...try bleeding them to ensure there isnt a cushion of air that youre feeling...should be bleed screws on the top of each axle housing ...on top of the flanged area where the axles bolt to the transmission case...just "crack " them open and apply the brakes lightly...to let oil and air if present oooze out...otherwise if you open them too much you'll be wearing alot of oil as 2300 psi coming out of a 1/8 inch bleed screw will travel pretty far !! I'm assuming this has an 8 speed powershift transmission ?? All the ones I've ever seen have that but I believe a gear shift type was available too...Powershift transmissions should have a park pawl that locks the transmission mechanically when placed in "park"..Age and linkage wear as well as the possibility that the gear teeth on the lock mechanism have broken off may cause it to no longer work. You can get a manual from JD ...pricey I'm sure...but its exact for the machine...not a vague one size fits all type of book.

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exdynahoeman

10-01-2004 18:40:55




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 Re: John Deere Hoe brakes OUCH!!! THANKS!! in reply to Jonathan in MA, 09-30-2004 17:35:24  
Thank you Jonathan, you take the time to reply to alot of posts on this board and we all appreciate your time and thoughts. I guess I would call it a "bounce" but it just seemed odd to me. However, all I"ve evr owned and operated are the dynahoe and this JD so it may be normal, at least it stops!!. And as far as the park goes, it does have the 8 speed tranny (boy is that nice after running the dynaslow!!) It doesn"t make any grinding noise etc in park but does just roll away.... The linkage itself just about everywhere is a bit notchy and I can see the rust dust seeping about. The machine was maintained quite well but with a lot of hours on it, the little pivots and slide surfaces are in need of some attention. Then I could ssee what is operating what.

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Jonathan in MA

10-02-2004 05:57:48




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 Re: John Deere Hoe brakes OUCH!!! THANKS!! in reply to exdynahoeman, 10-01-2004 18:40:55  
they do feel "different" especially if you are accustomed to the other type. There should be a cable that connects the shift lever to the park lock lever. The park lock lever is on the right side of the trans. case ...near the top , in front of the right axle. I haven't physically worked on one in awhile, but something that sticks in my mind is trying to overcome linkage wear and still get that lever to activate the park lock completely...you'll know as it will ratchet instead of locking. And when it does work, you still really never trust it....and still lower the stabilizers or buckets, to be sure it stays put...

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