Connstellation
Well-Known Member
Greetings. Back again. Some back story first. So I did some major work on the boom/ bucket/ straight travel half of valve body, if anyone's seen the post. Basically I welded a cracked wall/ sleeve 3 bore sections and straightened the boom spool shaft with repeating spot heats. I've got roughly 8 hours on the machine since buttoned up.
The tank still had roughly 20 gallon in it while repair was done, thus the pump was never drained of fluid, but I still followed air bleed procedures. The valve body spools were pre lubricated and filled before first run. Roughly 25 gallons of fresh aw46 fluid put back in.
When working on valve body I had to lightly hone various bores of various functions due to slight movement/grit, etc, nothing more than a polishing.
When I was doing seals I did not fully understand the safety suction valves and how they sealed and noticed one of the boom suction valves wear rings [the one the slides into the sleeve] was a little worn and went to replace thinking it was just an o ring. Boy should I left good enough alone. It split right as I tried to pick it out and realized it wasn't just an o- ring. So I removed the original o-ring and put a thicker round edge on and don't think it's sealing.
So what's happening? Machine starts up with a tip of a tap of my push button. Engine isn't labored. End cap of pump farthest from engine is 110deg/f at idle, 120deg/f when functions worked. Strainer has some metal shards/rubber, but only enough to fill a drop of water, if that, I'm really not suspecting a bad pump, I believe this is left over from when one of the boom cylinder pistons grenaded.
At first the boom cylinder would raise with pilot controls, but drop when let off [like a bypassing cylinder] Didn't have ability to lift machine on down pressure. Bucket would function but seemed to not have power. Both tracks seemed to have power. After cycling everything I heard a hiss, kind of like a high pressure leaking air hose l, but at a higher scale. [This is possibly my boom suction valve?] Shut machine off right away. Checked strainer, couple metal shards seem left overs from cylinder and little rubber.
Started machine again, no hiss. Boom/ bucket 1 track function were significantly weaker to almost not noticeable like pump wasn't working. Swing/arm/ tram about half. After cycling everything the hiss happened again, and shut off. Checked strainer, nothing new metal/rubberwise.
Started machine 3rd time. Almost no function on both pumps. At 75% throttle boom will try to raise, bucket will try to start moving, arm will try to budge, tracks will try to initiate if I try to piggyback both pumps. I have swing.
So im assuming my suction safety isn't sealing and might've been the hiss, would that affect all machine functions? I may have installed the straight travel spool or spring incorrectly, but I doubt it, will need to check. The bottom hose 3/4inchish hose is decently warm relative to end of pump [110deg/f] while rest of pump/ fluid is ambient[90deg/f] which makes me wonder if I am bypassing somewhere due to an oops on my end. I read through the troubleshooting on book, nothing really seemed to apply.
Im confused how I went from a working pump, to a system that is stopping functions at each engine start up. I plan to check function spools, travel straight spools, e.t.c everything I did but not sure if someone has a better idea in mean time while I bang my head against the machine.
I don't have the ability to hook a guage up to pump at this time.
As always I appreciate any input and ideas.
The tank still had roughly 20 gallon in it while repair was done, thus the pump was never drained of fluid, but I still followed air bleed procedures. The valve body spools were pre lubricated and filled before first run. Roughly 25 gallons of fresh aw46 fluid put back in.
When working on valve body I had to lightly hone various bores of various functions due to slight movement/grit, etc, nothing more than a polishing.
When I was doing seals I did not fully understand the safety suction valves and how they sealed and noticed one of the boom suction valves wear rings [the one the slides into the sleeve] was a little worn and went to replace thinking it was just an o ring. Boy should I left good enough alone. It split right as I tried to pick it out and realized it wasn't just an o- ring. So I removed the original o-ring and put a thicker round edge on and don't think it's sealing.
So what's happening? Machine starts up with a tip of a tap of my push button. Engine isn't labored. End cap of pump farthest from engine is 110deg/f at idle, 120deg/f when functions worked. Strainer has some metal shards/rubber, but only enough to fill a drop of water, if that, I'm really not suspecting a bad pump, I believe this is left over from when one of the boom cylinder pistons grenaded.
At first the boom cylinder would raise with pilot controls, but drop when let off [like a bypassing cylinder] Didn't have ability to lift machine on down pressure. Bucket would function but seemed to not have power. Both tracks seemed to have power. After cycling everything I heard a hiss, kind of like a high pressure leaking air hose l, but at a higher scale. [This is possibly my boom suction valve?] Shut machine off right away. Checked strainer, couple metal shards seem left overs from cylinder and little rubber.
Started machine again, no hiss. Boom/ bucket 1 track function were significantly weaker to almost not noticeable like pump wasn't working. Swing/arm/ tram about half. After cycling everything the hiss happened again, and shut off. Checked strainer, nothing new metal/rubberwise.
Started machine 3rd time. Almost no function on both pumps. At 75% throttle boom will try to raise, bucket will try to start moving, arm will try to budge, tracks will try to initiate if I try to piggyback both pumps. I have swing.
So im assuming my suction safety isn't sealing and might've been the hiss, would that affect all machine functions? I may have installed the straight travel spool or spring incorrectly, but I doubt it, will need to check. The bottom hose 3/4inchish hose is decently warm relative to end of pump [110deg/f] while rest of pump/ fluid is ambient[90deg/f] which makes me wonder if I am bypassing somewhere due to an oops on my end. I read through the troubleshooting on book, nothing really seemed to apply.
Im confused how I went from a working pump, to a system that is stopping functions at each engine start up. I plan to check function spools, travel straight spools, e.t.c everything I did but not sure if someone has a better idea in mean time while I bang my head against the machine.
I don't have the ability to hook a guage up to pump at this time.
As always I appreciate any input and ideas.
