• Thank you for visiting HeavyEquipmentForums.com! Our objective is to provide industry professionals a place to gather to exchange questions, answers and ideas. We welcome you to register using the "Register" icon at the top of the page. We'd appreciate any help you can offer in spreading the word of our new site. The more members that join, the bigger resource for all to enjoy. Thank you!

boom cylinder

  1. 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
  2. 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...
  3. 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
  4. 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...
Top