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When I purchased my Jimna 284 in 2006, I also ordered a extra bck hoe pump. I was having a few problem with the operation so I decided to try the new pump, but the direction arrow is reverse of the original one. Have any one disassemble one and reversed the gears, so the large port is suction and small port, high pressure?
I think the problem started when one of the stabilizer cylinder wouldn't retract. Possiblely this cylinder is causing the Valve bank not to function.
I think all the pressure is going around the seals, therefore nothing is working. Will install pressure gauge, ( previous stated by Mr. Rooks ) and see if it's the pressure
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If you have a bad cylinder, it won't affect the whole system unless pieces of broken seal or debris have stuck in the relief valve. That means you have to takeitapart and clean it.
The large port should always be the inlet, but this is dependent on the rotation of the gears. You want the pump rotating in a manner which reveals the gears parting at/through the inlet port. The discharge port is always the smallest (or of equal size), and should show the gears coming together. You may have to rotate (not flip) the pump body 180° to accomplish this.
Account deleted.
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You can change it very easy, as Bob mentioned.You can always have both pumps side by side with the suction and outlet ports the same side , then match the new pumps internal gears with your old one.
Tommy
Affordable Tractor Sales
“Your Jinma Parts Superstore”
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I took the pump to the Local Hydraulic shop in Surrey, B.C. ( done work for me before quite Good) He stated ther same thing that if one cylinder was out it should not affect the rest of the operation.
I'm getting him to test the pump, for pressure, check the stabilizer cylinder for working order, and rotate the extra pump and test.
I did clean the pressure relief valve and it seemed clean, no particales around the needle, and blow out the needle base, cleaned the upper base with O-ring and spring, all looked clean.
Hydraulic shop stated it could be in the Valve Body, I don't like the idea of trying to pull all the spools out to check, but the Back-hoe isn;t much good if it won't work.
Any way, I'll re-install pump and cylinder after it's been cleared, and give it a try.
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I have some of the complete valve bodys if you end up needing one, while I don't keep many of the parts for the Chinese backhoes, I did end up with several of the valves
Tommy
Affordable Tractor Sales
“Your Jinma Parts Superstore”
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Well, had the Hydraulic shop, check pump, ( they stated because the slot on the pump drive was hard to test, but it was pumping ) the cylinder was tested and functioning properly, they thought it was something in the Main valve assy.
Headed back to the Cabin on Wednesday, re-installed pump and stabizier cylinder, and it still won't work.
Decided to take the presure relief valve apart ( did this once before about 3 years ago ) any way took it apart recleaned still nothing. The fluid in the tank was still moving.
This was not a happy time, then the Misses, comes to the shop and ask's ( how's it going Honey) not good.
Then she ask's did you put it back together properly?
I then decide to check the old Front end loader valve, ( which I replaced 4 years ago, to the one offered on this Site )
Sure enough, I place the small spring into the small piston, instead of the other end.
Re-installed, properly, and now it works !!!!!!
I think I can now re and re the pressure relief in my sleep. Bob
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Those backhoes can be a real stickler, I have had several over the years that have completely stopped working and usually we could take apart the pressure relief valve, blow out reinstall and they would start working again, had that happen on several occassions. We stock most of the parts for that backhoe if you need anything in the future.
Ben
Circle G Tractor Sales, Inc.
http://www.circlegtractorparts.com
662-252-5272
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