Reposted this in correct area now Howdy everyone. Recently joined, long time thread searcher though. I have a 216B (RLL01828) that threw a rod last summer and I recently found a core 3024c to rebuild and get the machine running again. Long story short, motor is in and happy, everything checks out but machine will not even try to move. Loader arm and tilt cylinders function as normal, no Parker brake warning lights, fluids are full, no contamination in hyd oil ( I cut the old filter open and no debris) and pump pressures are in spec (440psi) using a Cat hydraulic gauge. I have tested and made sure the park solenoid is working, hydrostatic pilot solenoid is working and work tool. Each one ohms correctly and functions asintended. Any ideas or guidance would be immensely appreciated. Little background on me, I also have a 262B, and a 277B that I have intimate knowledgeof. I have seen many issues with these B models over the years however this one has me perplexed. Thanks in advance, JCB
have you primed the hydrostatic drive pump
Yes, the system has been primed with a hand pump. As another check, I have gone back and cracked lines to ensure no air was trapped and causing cavitation inside the pump. When idling the pressure ports on the pump all show 440-465psi depending rpm speed. The machine will not act like it’s even attempting to load the hydrostatic pump when listening to rpm.
In that case I would be checking the pilot pressure before and after the travel pilot valve
Mark, info on how to do that would be great. I hooked into the pressure port for the speed sensing valve line and I am showing no pressure on what I believe is a spec of 245psi with a variance of 10psi. This line also feeds the left pilot control. I’m going to take apart the speed sensing valve (204-1457) and have a look at it. thoughts?
the easiest place to test is at the travel control valve you can place a tee in a pilot line and connect a gauge and observe pressures while operating the machine I have included a hydraulic schematic and where the actual test points are on the hydrostatic pump, for charge pressure and reduced pressure from the speed valve that supplies the travel pilot valve but it is much easier from in side the cab the test points on the hydrostatic pump are stamped and labled in the pump housing Y for speed sensing ppressure and G1 for charge pressure Don't forget that charge pressure changes with engine RPM
I forgot to mention it doesn't matter which connector you use for testing just move the joystick around until the gauge registers your pressure
So, I took the speed sensing valve out, found it seized. Disassembled, cleaned it and reassembled. Pressure came right into spec and machine is working great. This ordeal has had me chasing my tail for a week. Any thoughts why it would have seized? I found no rust in it. Very odd. Time will tell if it decides to cause me more problems. Cost on a new one is $607. I wonder if a dealer would’ve caught this quickly or condemned the pump. Big difference in the prices
A lot of times you will take something like that apart and not even realize that something made it seize up. The tolerances are so close it doesn't take much to lock things up. Glad to hear you have the problem fixed though.