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JD 165 backhoe operating pressure?

B

Bob in MN

New User
I"m setting up a JD backhoe to operate on an independent hyd. sys. rather than the tractors sys.

The operators manual that I have says:
"Specifications are based on a job ready machine w/std. equipment and 2000 psi hyd. pressure."

Another test was done at 2250 PSI.

My question is for determining what size/rating bypass valve to use. What I"m finding at the local farm supply stores are preset valves opening at 2500 psi. Is this an average value for hyd. sys.?

JD indicated as tractors to use this attachment on are: 820, 830, 1020, 1520, 1530, 2020, 2030, 2630. Anyone know the working pressures on these tractors?

Thanks,
Bob
 
The JD control valves are likely setup for closed center and odds are 99.999999% that the aux pto pump is open center.
The valves maybe convertible to open center and a relief pressure of 2250 set. Some of those JD backhoe valves have relief valves incorporated into them.
What kind of tractor is the backhoe mounted to? If it's a deere an aux hydraulic pump is not required. The tractor will have more than sufficient capacity in flow, cooling and storage.
What size pump, tank and cooler have you purchased?
 
I've seen a 165 hoe that fit's on skid steers. Is this the same? If so it's probably open center. A lot of relief valves are adjustable. 2500 PSI is common but having a little less may help to prevent serious damage to the hoe or tractor. Dave
 
It's an old hoe from 1973 to 1978 intended for use on the #170 skid steer or 820/830 utility tractors.
There is a parts list and some hose connection info here.

http://jdpc.deere.com/jdpc/servlet/com.deere.u90490.partscatalog.view.servlets.HomePageServlet_Alt
 
There is more info in the parts book for the 165 used with the 170 skid steer.
An optional 2000psi pressure relief valve is listed on page 21. An open to closed center conversion plug listed on page 15.
The project appears do-able.
 
Just sold a 165 that I bought new back in the 70s. I had it set up for open-center operation. I used it on a Ferguson F40 with a pto pump. It had a relief valve built into the valve assy. It operated at 2250. It was one of the first made so,I would bet that they all have built in relief valves. Good little backhoes. I bought a new industrial John Deee 110TLB and sold it,but I used the 165 for over 30 years. Some of the hoses in the boom are a little hard to change. I sold it for more than I gave for it after using it 30+ years.
 
Good to hear that you had such good luck with your hoe.

I"m mounting mine on a Allis Chalmers D-17 series I. That is why I chose to go independent on the hydraulics.

This hoe does have the skid steer mount on it w/a JD conversion adapter to 3 PT.

This hoe was mounted on a JD 1020 gas tractor. Does that tell you JD guys out there which way these valves might be set up, open or closed?

The parts catalog indicates that valves for the BOOM, SWING, DIPPER have relief valves built into them but not in the bucket valve. This still does not eliminate the need for a SYSTEM relief valve, does it?

My setup is an assy. of parts that were available to me and not necessarily the best choice for the application.

I am using a FARMHAND PTO pump. I believe it is 10 GPM. The tank is 15 GAL. At this point there isn"t a cooler attached. I have a fan/radiator style cooler I could use.

Thanks again to all of you who have responded.
Bob
 
(quoted from post at 12:04:35 08/15/10)This hoe was mounted on a JD 1020 gas tractor. Does that tell you JD guys out there which way these valves might be set up, open or closed?Bob
Click to expand...

1020 was a closed-center and stand-by pressure was factory set at 2250 psi
 
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