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J D 790 300 loader 7 backhoe

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blacksheep
Join Date: Feb 2007
Posts: 34 ohio
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster

2007-02-19          139888


Hi,just a new member with a question on the 300 loader on a 790 tractor. Does anyone have one that has loosen up on the tractor??? also I think I read where somebody has made more hyd power for the 7 hoe or a diffrent pump??? By the way 790 is 2006 with 40 hours on it.

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J D 790 300 loader 7 backhoe

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JAZAK5
Join Date: Jul 2003
Posts: 276 coxsackie,ny
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster

2007-02-20          139900


you can increase the pump presure on the tractor,several theads on the issue however the 7 series hoe has its own releif valve settings and adjustments
tech manual (tm1319) page 20-10-06 states that system pressure is only to be increased for TESTING with one washer part # (r56438).
HOWEVER the hoes operating pressure is 1550 psi to 1800 psi and the tractor is around 2050 psi. As several past discusions you may be exceding design limits in reguards to hoses,actual design,case hardning of cylendar rods,bushings or pins.From my experence with my hoe is that left at factory settings you WILL NOT BREAK IT.
I have the 419 loader, most operating manuals state periodadic maintenace is allways needed,proper torque of bolts,condition of bolts and treads are all items to be a part of operating equipement. if bolts loosen,there are only a couple of reasons/improper torque,improper assembly or inferrior materals ,yes bad bolts , can happen . You can inspect, clean ,(red loctite) AND RETORQUE THE BOLTS and if they loosen again REPLACE THEM.
CALL THE DEALER it should be a warranty /safty issue !!!! ....

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____________________________________________________________________________________
J D 790 300 loader 7 backhoe

View my Photos
blacksheep
Join Date: Feb 2007
Posts: 34 ohio
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster

2007-02-20          139922


Thanks for your reply, where can I find the other threads on this ?? Also I take it you have done this on your 7 hoe? ....

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____________________________________________________________________________________
J D 790 300 loader 7 backhoe

View my Photos
JAZAK5
Join Date: Jul 2003
Posts: 276 coxsackie,ny
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster

2007-02-20          139924


I've increased the tractors presure for the fel however I have left the hoe alone,it does what I want it to do so far.
As for the other treads,type "790" in the "topic search"box and look for the tread dated 08/05/07 time 5:30 pm. ....

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____________________________________________________________________________________
J D 790 300 loader 7 backhoe

View my Photos
blacksheep
Join Date: Feb 2007
Posts: 34 ohio
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster

2007-02-20          139927


Thank you for the advice JAZAK5 ....

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