Hi
Read a thread here bout an 5t excavator with a similar issue to my JCB Robot skidsteer, but they never posted the answer/fix.
In brief, after about 1hr of operation, the loader begins moving slower and slower. It bogs down while loading, and gets steadily worse. Filters have been changed. I have noticed if the bucket is raised while moving, the drive (forward and reverse) will slow to a crawl. Also noted; when lowering the arm/bucket slowly while moving the machine forward, and the ground speed is increased more than just leaving the bucket/arm fixed in one position. Sort of like the release of pressure off the lifting arm, allows the machine to increase ground speed.
Is this a hydrolic problem, or a fuel problem? I would have thought a fuel blockage would make the slowing ground speed evident from start up, not just after an hour of running the machine. When loading, it does bog down from start, but worse after an hour.
Are the drive-chains driven hyrdolically or mechanically?
I guessed it would be lack of power delivered from the engine to the hydrolic pump, but the engine rpm doesnt seem to change, unless trying to load/scrape causing it to bog down/almost stall.
It doesnt blow any smoke, unless it bogs down, and that is a black smoke, but it isnt like a cloud or anything. I would have thought too, if it's lack of fuel, then it wouldnt have the black unburnt fuel smoke.
Also, what/where are the pressure relief valves? I did disconnect the low oil switch (which is on low pressure line from the oil tank) but it was doing the bogging down before that (the switch internal oil seal failed, and started leaking oil out of the switch). I have checked oil levels, and all seems fine there.
ok, that's about all I can think of for now. Ok, not so much in brief it would seem, but any help you guys could offer would be great.
cheers
Read a thread here bout an 5t excavator with a similar issue to my JCB Robot skidsteer, but they never posted the answer/fix.
In brief, after about 1hr of operation, the loader begins moving slower and slower. It bogs down while loading, and gets steadily worse. Filters have been changed. I have noticed if the bucket is raised while moving, the drive (forward and reverse) will slow to a crawl. Also noted; when lowering the arm/bucket slowly while moving the machine forward, and the ground speed is increased more than just leaving the bucket/arm fixed in one position. Sort of like the release of pressure off the lifting arm, allows the machine to increase ground speed.
Is this a hydrolic problem, or a fuel problem? I would have thought a fuel blockage would make the slowing ground speed evident from start up, not just after an hour of running the machine. When loading, it does bog down from start, but worse after an hour.
Are the drive-chains driven hyrdolically or mechanically?
I guessed it would be lack of power delivered from the engine to the hydrolic pump, but the engine rpm doesnt seem to change, unless trying to load/scrape causing it to bog down/almost stall.
It doesnt blow any smoke, unless it bogs down, and that is a black smoke, but it isnt like a cloud or anything. I would have thought too, if it's lack of fuel, then it wouldnt have the black unburnt fuel smoke.
Also, what/where are the pressure relief valves? I did disconnect the low oil switch (which is on low pressure line from the oil tank) but it was doing the bogging down before that (the switch internal oil seal failed, and started leaking oil out of the switch). I have checked oil levels, and all seems fine there.
ok, that's about all I can think of for now. Ok, not so much in brief it would seem, but any help you guys could offer would be great.
cheers