RUBBER BAG

RUBBER BAG 3214 6238 02 is essentially the guts of your hydraulic accumulator, the flexible barrier that keeps the nitrogen gas pre-charge from mixing with the hydraulic oil. It's crucial for dampening pressure pulsations that would otherwise hammer your system components, and it also stores up hydraulic energy for quick demands, like when the rock drill needs that extra punch or the boom needs a smooth ride. Without it, your whole hydraulic circuit takes a beating.

When this bag starts to go, usually what happens is the nitrogen leaks past it or the bag itself ruptures. You'll often notice the rig's hydraulic system acting sluggish, maybe the boom starts to bounce a bit more than usual, or the rock drill's impact feels inconsistent – like it's not hitting with full force every time. A classic sign is also a rapid, erratic fluctuation on your hydraulic pressure gauges, especially if you're watching the accumulator circuit. Sometimes you'll even hear the pump cavitating more, working harder than it should because it's lost that critical dampening effect.

When you're swapping one of these out, don't just yank the old one and shove the new one in. Always, always check the nitrogen pre-charge pressure on the accumulator housing with a proper charging kit after installation. It’s surprising how many guys forget to verify that, or they just assume the old setting is good. Also, give the inside of the accumulator shell a good clean-out before you put the new bag in; any sharp edges or debris can cut the new rubber prematurely. It’s a simple step that saves a lot of headaches down the road.