Lubricants for Jinma 284

[trentay]

Greg,

Well, I think I understand what you are saying, kinda, but here is what I think happens:

When the steering hits the mechanical stops on the axle, the steering wheel stops in the same manner as your loader stops when the cyl is fully extended or closed. I don't think there is a bypass in the steering actuator on these tractors to relieve the flow to the steering cyl when the stops are hit, thus if the seals are blown on the piston in the steering cyl, then the fluid will bypass and keep flowing and the steering wheel will just keep turning when the stops have been hit. After taking the system apart and checking everything, the only fix was to replace the obvious blown seals, problem solved and the steering wheel stops when the axle stops are met.

 

[SPIKER]

hummm mine does not stop when it hits the stops and suspedct same thing, but then again if it hits stops and some fluid does not bypass then it could blow line or damage something if you hit a rut with wheel held hard! I think there needs to be some type of bypass otherwise broken parts are going to happen... Just my 2 cents worth but when mine gets good and hot it does not steer as well as when it is cold fluid...

Mark M /forums/images/graemlins/confused.gif

 

[JohnS]

I recently had the front end lifted to do some back and forth steering tests. My steering wheel did stop, when hitting the mech stop, and made a hyd noise similar to when the fel hits its stops. I did not force or try to go further. The steering wheel trys to go back when it was at stops. Just another data point. (Jinma 284 w/front steering cyl)

 

[Soundguy]

</font><font color="blue" class="small">( but then again if it hits stops and some fluid does not bypass then it could blow line or damage something if you hit a rut with wheel held hard )</font>

Keep in mind the master hyd system will have a relief valve n the system.. and that relief should be ov a level -under' the bursting pressure of the weakest link in the system.. fittings and hoses included.. etc.

Soundguy

 

[greg_g]

</font><font color="blue" class="small">( Keep in mind the master hyd system will have a relief valve n the system.. )</font>
You really need to buy one for your collection Chris, so you could experience some of this Jinma stuff - first hand.

//greg//

 

[Soundguy]

I do plan on getting one eventually.. However.. are you saying there is no relief valve in the system? Or is the relief value set higher than ..say.. chineese packing?

Soundguy

 

[greg_g]

</font><font color="blue" class="small">( are you saying there is no relief valve in the system? )</font>
In many cases, I'd say the answer to that question is yes. Granted, there is more than one Jinma hydraulics configuration on the street, but the most common I've encountered is the single pump/closed loop. The pump itself has no relief valve at all. In fact if the first QD pops loose for any reason, you'd best shut down the engine real quick before you blow the pump. That is, if the pump drag hasn't killed the engine already.

And as you have read earlier in this same thread, the steering controller has little more than a "bypass". From what I can gather, only those with FELs benefit from the relief valve that may or may not come with the loader hydraulics.

//greg//

 

[JohnS]

Is the relief valve built-in part of the diverer valve? See small cyl on side of the main part of diverter valve. Diverter Valve I can't believe that there is no relief valve.

 

[Soundguy]

I knew about the QD issue.. it is a terrible way to design something, as it deadheads the pump if it pops loose... An inline relief to tank would be a great thing.. right there..

As for no relief in the system.. I'd just have to see a schematic of it.. I simply can't imagine that even the chineese wouldn't include one..

Soundguy

Soundguy

 

[greg_g]

IF there is one Chris, it's seemingly ineffective. Only Jinma "relief" I've observed, is in the form of multiple leaks from cheap seals/gaskets/hoses - and all the fluid that blows out the rear vent. That said, it's all repairable - most are simple quality control issues - and they were all eventually fixed, and I traded an honestly leak-free Jinma.

Now my KAMA is a whole different story. Touch wood, but I've not seen ANY of the Jinma-type hydraulic problems on my KM454 yet. The power steering takes MUCH more effort - but at least it's dry.

//greg//