adamls78
New member
I just wanted to know if anybody thinks the 300 loader is on the weak side or if it is just mine.
JD 790 300 loader
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adamls78
New member
Put a shim kit where?
Here is a thread on it.
http://www.tractorbynet.com/forums/john-deere-buying-pricing/119041-jd-790-4x4.html#post1371558
http://www.tractorbynet.com/forums/john-deere-buying-pricing/119041-jd-790-4x4.html#post1371558
kennyd
Advertiser
On the relief valve...This has been discussed a lot in the forum-it seems the 790's have very a very low pressure setting from the factory. You will NEED a gauge setup to adjust the pressure. It's not the loader's fault
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adamls78
New member
Where do you get the kit from and has anybody had problems with hoses blown off after the kit was installed
JD -- AM875169 SHIM ***'Y, RELIEF 2.68 2.68 Stock.
I've had no problems. I put all the shims in the kit in. I think some have put multiple kits in. Certainly if I was going with more than one kit I would check the pressure when the relief valve kicks in.
I've had no problems. I put all the shims in the kit in. I think some have put multiple kits in. Certainly if I was going with more than one kit I would check the pressure when the relief valve kicks in.
Phineas7
Silver Member
That part # is a bag of shims. Any JD dealer should be able to order it for you. Definitely the best 2$ modification for a 790. While your there, get the o-ring for the pressure regulator. I didn't check the link, but I assume it's the one with pictures and instructions. They recommend the o-rings to be replaced, and sure enough when I dis-assembled mine, the o-ring broke and turned the 20 minute job into a 2-day job, cause I had to go get parts.
You won't be popping stumps out of the ground, but after the kit is in you'll be able to easily lift a bucket full of wet GA clay, I mean dirt!
You won't be popping stumps out of the ground, but after the kit is in you'll be able to easily lift a bucket full of wet GA clay, I mean dirt!
dirt ditch
Platinum Member
Ordered 2 shim packs for my 790/300 yesterday. Shimming the relief valve to 2500psi seems to be what most 790 owners have done on tbn. I could be wrong but I think it would be safe to shim the pressure up to 2600-2700psi. The 3005 Hydraulic System has a working pressure of 2422-2698 psi. Both tractors have the same hydraulic pump, same part number. I believe the slightly larger flow rate of the 3005 (10.3 gpm) over the 790 (9.6 gpm) is due because of the higher pressure. I have a gauge and quick coupler setup to accurately adjust the pressure so we will see.
But... like I said before, I could be wrong.
But... like I said before, I could be wrong.
Ordered 2 shim packs for my 790/300 yesterday. Shimming the relief valve to 2500psi seems to be what most 790 owners have done on tbn. I could be wrong but I think it would be safe to shim the pressure up to 2600-2700psi. The 3005 Hydraulic System has a working pressure of 2422-2698 psi. Both tractors have the same hydraulic pump, same part number. I believe the slightly larger flow rate of the 3005 (10.3 gpm) over the 790 (9.6 gpm) is due because of the higher pressure. I have a gauge and quick coupler setup to accurately adjust the pressure so we will see.
But... like I said before, I could be wrong.
The online specs I see for the 3005 are:
Hydraulics
Type Open Center
Pump Rated Output, gpm (L/min.) 9.4 (36.4)
Steering 4.2 (15.9)
Implement 5.4 (20.5)
Pump Type Single gear (Manual steering models); Dual gear (Power steering models)
Maximum Operating Pressure (PSI) 2050
Draft Control Type Position control
Remote Control Valves Available 2
All the same as the 790. I don't think anything was changed except the name. At 2500 I would be worried about my pump and hoses and most of all being able to lift more than the tractor can handle. Just my opinion.
