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I have a Jinma 284 with a FEL and a self contained (built in hydraulic fluid resevoir with its own pump that mounts on the tractor just above the PTO) JW-03 backhoe. I'm have a problem with hydraulic fluid blowing out the vent holes in the filler cap of the backhoe reservoir. I've filled it to the proper depth, checking it with the dipstick. I guess the first question is, is the fluid level in the built-in reservoir checked with all of the cylinders compressed? or extended?<br>
<br>
I filled the tank with the backhoe cylinders compressed, and the outriggers extended to make the unit as level as I could. With the engine running at 1500 RPM I ran all of the cylinders all the way out, and in a couple of times, shut it down, checked the fluid level and it was right on the money. The backhoe operated smoothly.<br>
<br>
While operating the backhoe under load digging, and I would curl the bucket, or pull in the arms, or even move the whole unit from side to side, I got a steady stream of hydraulic fluid running out of the vent hole in the filler cap. This was clear, not foam. Not when the arms were being extended, only when they were being pulled back in. <br>
<br>
After this happened a couple of times I tried the following. The next time it happened I unscrewed the dipstick, creating a vent in the main tank. I heard air escape from the tank (not like a spray can, but slow like a large tank with some air trapped in it) and the fluid stopped squirting out of the filler cap vents.<br>
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I noticed that when I re-filled the reservoir (I drained it and cleaned it, only small amount of sediment on the bottom) with new fluid I could not fill the tank to the correct level unless the dipstick was out or the bolt it's welded to was pretty loose. If I left it screwed in tight the fluid would fill the tank up to the cutout in the bottom of the filler tube, then fill the filler tube. When I took the dipstick out the fluid level in the tube went down and I could feel, and hear, a small amount of air escaping through the dipstick hole.<br>
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(Don't beat me up over this next part) I had a small amount of digging to do cleaning out a corner where I'm building some corrals and left the dipstick loose in the hole so the pressure could equalize in the reservoir as I dug. No overflow. Not once.<br>
<br>
1. Am I doing something wrong? (read dumb)<br>
2. Can I (should I) vent the reservoir to eliminate this problem?<br>
3. Do I keep buying hydraulic fluid?<br>
4. Sell the backhoe and hire a couple of day laborers?<br>
<br>
Thanks,<br>
<br>
Jeff<br>

backhoe fluid overflow
Jinma Farmpro Agracat Nortrac
Replies 3 Post by sarge1572

Let me start by saying, "Tommy for President, Ron for Vice-President"

Of course it worked, just like you knew it would. I don't mind telling you that I was pretty nervous about about it considering my luck to that point.

JInma 284 hydraulic pump HELP
Jinma Farmpro Agracat Nortrac
Replies 7 Post by sarge1572

I bought it all assembled. If the price hadn't been so good, WAY less than a crate tractor, I would have bought one in a box. I find that I have a better grasp of how stuff works if I put it together, even if it's just fenders, wheels and "stuff". After looking at several of the sites where people have assembled their own, it looks like a pretty straighforward assembly. I rebuilt a couple of cars (old ones that don't use computers to run) and am restoring a sailboat so I do have a little mechanical experience and most of the tools. If you've made mechanical repairs on your car or truck (and it ran when you were done) you can probably assemble one of these. Most of the BIG stuff is done. Its not like you're building an engine, or trying to adjust gear lash in the differentials.

I bought mine from Cold Water Tractors in Hoquiam Washington, drove 1100 miles each way to get it (and it was STILL cheaper than the best price I found for one with all the pieces I got in crates). They're not on the internet anymore (www.coldwatertractors.com), I checked for it, gone, but maybe in the phone book. They build their own front end loaders (very robust)and sell them for about half of the commercially available ones. I bought mine, assembled with a FEL, Jinma backhoe, 2 sets of front weights, and 5' box scraper for $10,500. No sales tax because I'm from out of state.

Based on my experience so far, I'd buy another one.

Jeff

Jinma in a crate
Jinma Farmpro Agracat Nortrac
Replies 18 Post by sarge1572