Does anybody know the settings for the relief valves, the servo pressure, dipper boost dump valve etc..? My repair manual has all the necessary instructions on how to check and if necessary adjust the valves, but they give no pressure specs. They point to the technical data, which is nowhere to be found in the manuals. I am experiencing a variety of problems with my mini and since a so called professional had "repaired" and operated my machine it is a wreck. It started after he replaced the seal kit for the dipper ram. After working for 10 hours with the new kit the dipper started to sink by itself with the machine running or not. Since he had just put new seals for the dipper ram, he was looking for the problem else where and sure as hell found a fairly big chunk of metal in the dipper control valve. That is after he had determined that the dipper control valve was stuck and had "hammered" the spool back to its neutral position 2 times.
It was determined that the dipper control valve had "internal" failure and a new valve for $ 1,4000.00 was ordered. In the meantime the professional kept operating the machine because if one was working quick enough the sinking of the dipper was hardly noticeable. After 10 more hours of working the dipper finally lost all power and we stopped working to wait for a new valve to arrive from England. We installed the new valve and the problem was the same. It was then that we looked at he obvious and blocked the rod side of the dipper and sure as hell the dipper came down rapidly. After dismantling the dipper Ram it was clear that something went terribly wrong when replacing the seal kit. The piston (head) had big chunks of metal torn out, the cylinder was scored beyond repair and it became clear that the piece of metal found in the control valve camo from the piston and not from the valve. After installing a new ram we drained all hydraulic fluid and flushed all the lines as it was likely that the whole system was contaminated with pieces of metal. Apparently we did not do a good enough job because now the bucket ram and the dozer ram are failing as well. The slew does not hold position and if parked on a slight incline the machine slews downhill even with the engine turned off. I have ordered seal kits for the failing rams, but am afraid that the rams might have more damage than the seals. Did not have the heart to take them apart yet. Furthermore, after operating for a while it seems that the oil is getting extremely hot and the servos start making a squeaking sound when certain functions are active. This seems to be happening when the oil is getting hot. I am operating in tropical climate and have put AW 46 weight oil, as recommended by JCB, after all the trouble we had. Now I am finding out that everyone else here is using AW 68 oil. I am assuming that the high oil temperature is caused by the relief valves not working at the proper pressures. This is a mess.
If anybody has any encouraging suggestions and recommendations, other than buying another machine, I would really appreciate it.
It was determined that the dipper control valve had "internal" failure and a new valve for $ 1,4000.00 was ordered. In the meantime the professional kept operating the machine because if one was working quick enough the sinking of the dipper was hardly noticeable. After 10 more hours of working the dipper finally lost all power and we stopped working to wait for a new valve to arrive from England. We installed the new valve and the problem was the same. It was then that we looked at he obvious and blocked the rod side of the dipper and sure as hell the dipper came down rapidly. After dismantling the dipper Ram it was clear that something went terribly wrong when replacing the seal kit. The piston (head) had big chunks of metal torn out, the cylinder was scored beyond repair and it became clear that the piece of metal found in the control valve camo from the piston and not from the valve. After installing a new ram we drained all hydraulic fluid and flushed all the lines as it was likely that the whole system was contaminated with pieces of metal. Apparently we did not do a good enough job because now the bucket ram and the dozer ram are failing as well. The slew does not hold position and if parked on a slight incline the machine slews downhill even with the engine turned off. I have ordered seal kits for the failing rams, but am afraid that the rams might have more damage than the seals. Did not have the heart to take them apart yet. Furthermore, after operating for a while it seems that the oil is getting extremely hot and the servos start making a squeaking sound when certain functions are active. This seems to be happening when the oil is getting hot. I am operating in tropical climate and have put AW 46 weight oil, as recommended by JCB, after all the trouble we had. Now I am finding out that everyone else here is using AW 68 oil. I am assuming that the high oil temperature is caused by the relief valves not working at the proper pressures. This is a mess.
If anybody has any encouraging suggestions and recommendations, other than buying another machine, I would really appreciate it.
JCB 8032 pressure settings
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