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boom cylinder

  1. S

    2003 308 boom drifts one way but not the other

    03 cat 308 c cr. 6000 hours. If you raise boom all the way up and turn loose of controls it will fall to the ground in probably 20 seconds, but you can pick the machine up with the boom and it will stay there all day long. Re did packing/ seals in cylinder, still same problem. Assumed it was...
    • Stevenstl12
    • Thread
    • boom cylinder cat cylinder drift excavator hydraulics
    • Replies: 3
    • Forum: Excavators
  2. I

    Haidrolic moment not working

    A tally handler of JCB whose extended boom gets stuck. We have changed the counter balance of the cylinder and changed the cartridge and the seal but the problem is still the same. One cylinder stops working first and another later.
    • ibadat
    • Thread
    • boom cylinder
    • Replies: 8
    • Forum: Cranes
  3. H

    Boom Cylinder Extends But Will Not Retract

    Cat 304CR (NAD00987) I've got a boom cylinder that will extend but will not retract. In other words, boom goes up but won't come down. When I try to boom down, I hear noise from the relief valve, but the cylinder only moves about 1/4". I don't have a way to test flow, but I have adequate...
    • Howey Matt
    • Thread
    • 304 304c 304cr boom boom cylinder cat caterpillar cylinder excavator relief valve
    • Replies: 34
    • Forum: Compact Excavators
  4. M

    Jcb 215 Main Boom Cylinder Repack Advice

    Hey guys, I was pulling up some stumps this weekend and the seal on my backhoes main boom split and started spraying fluid all over the cab. I’ve been reading the manuals and looking online about how best to change the seals and repack and was hoping I wouldn’t have to take out the entire...
  5. P

    Hitachi ex200-2 boom sticking when warm

    Hi, I have a problem that the boom cylinders respond at expected speed when machine is cold, but after an hr or so and the oil temp comes up, it starts to move very slowly and sounds like the pressure relief valve is going off. All of a sudden (randomly) the sound will stop and the full response...
    • Powerdig285
    • Thread
    • boom cylinder hitachi ex200 series 2 sticky spool
    • Replies: 7
    • Forum: Excavators
  6. D

    644 tt 34 Lull boom cylinder

    Hi all, new to this site, looks to be an awesome place! I am in the process of buying a 644 tt 34 Lull that has a leaking boom cylinder. I have rebuilt cylinders before just nothing of this length (it's about 10' long) It appears as though the cyl has to come out the rear of the boom and I've...
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