Hello and good day, sorry i did not get back with you sooner. The issue was...cylinder sequencing caused by a bad or damaged safety valve in the base of the cylinder. R and R cylinder with new due to the scoring on the piston and down time to rebuild of the cylinder was not an option. Thanks for everyone's input!!
Bob
what kevin says could also be the issue
but you might also want to check the 2 outer cylinders as well
if i'm not mistaken one of them has the same type of valve in it too and in some cases can cause the same symtoms
Is the carriage hanging up in the channel? Broken roller in the mast??
I have a truck that does this lifting of the channel before the carriage about once a week. Took the cylinder apart and the snap ring and valve were in place properly. Disassembled, cleaned and checked. Blew out the valve, checked the spring and plunger. Blew out the end of the cylinder rod and piston. Drained the tube and looked inside, clean. Assembled the valve with a new o ring and am hoping for the best. Any other ideas?
no not cylinder replacement
just remove the cylinder cap and take the piston out
the valve should be in the base of the piston
if it isnt then its probably in the bottom of the cylinder in pieces unfortunatly.
this is a common problem i have seen caused by a faulty snapring that holds the safety valve in place that breaks and allows that valve to come out causing the sequencing issue.
if you have any doubts about the removal and repair please call a local cat dealer to make the repair if safety is any concern.
jplayer, you hit it on the nose. What you described is exactly what is happening.
The valve in question is in the cylinder? Cylinder replacement? Maybe just valve replacement?
Thanks for your guys help!!
Bob
as was said it may be mechanical binding
or.....
the most common cause i've seen is cylinder sequencing issues caused by a bad or damaged safety valve in the base of the cylinder which causes incorrect fluid displacement in the cylinders.
when you raise it all the way to the top , then lower it down and then raise it back up does it return back to normal sequencing for a while? this is the tell-tell sign it is the valve.
Sounds like the carriage is binding up in the rail channel,spray it down with some Clark inner slide lube or fifth wheel lube and see if that helps.