Quad chip rollers

[leedeerman]

I've got a Greenmech Quadchip which is about three years old, a 2inch gap has developed between the feed rollers meaning small brash is a pain to chip, could anyone point in the right direction to fix it? Also I'd like to sharpen the rollers are they easy to remove? Thanks in advance.

[SEAN TYNAN]

does the spring need tightening for the rollers

[leedeerman]

does the spring need tightening for the rollers

no it's tight and a new spring

[PeteB]

Take the spring off the moving roller and inspect the slide - there might he something preventing it returning to the shut position. Ensure that the carrier rolls the full distance smoothly before replacing. I'm not sure that that much benefit can be gained from putting an edge on the rollers, good spring pressure should suffice.

 

Another thing worth doing on any older chipper is to check the blow off pressure as the spring may reduce its efficiency and it will work at a lower pressure - thus not pulling in so well.

[not for sale sorry]

Take the spring off the moving roller and inspect the slide - there might he something preventing it returning to the shut position. Ensure that the carrier rolls the full distance smoothly before replacing. I'm not sure that that much benefit can be gained from putting an edge on the rollers, good spring pressure should suffice.

 

Another thing worth doing on any older chipper is to check the blow off pressure as the spring may reduce its efficiency and it will work at a lower pressure - thus not pulling in so well.

 

Pete can I ask what the "blow off prussure" is please?

Edited February 26, 2013 by not for sale sorry
spelling

[leedeerman]

Take the spring off the moving roller and inspect the slide - there might he something preventing it returning to the shut position. Ensure that the carrier rolls the full distance smoothly before replacing. I'm not sure that that much benefit can be gained from putting an edge on the rollers, good spring pressure should suffice.

 

Another thing worth doing on any older chipper is to check the blow off pressure as the spring may reduce its efficiency and it will work at a lower pressure - thus not pulling in so well.

ok will do, thanks Pete

[PeteB]

"Blow Off Valve". It isn't an instruction!

 

A hydraulic system has a safety valve that allows the oil to bypass a valve if the pressure is too great for safe working. It prevents a hose exploding or seals from bursting etc if the system is under too much pressure. It is usually an adjustable spring pushing against a ball bearing against a hole in the valve. If the pressure is too great, the ball moves back against the spring, allowing theoil to bypass. If the infeed rollers stop pulling in because the timber is too big, that is "dead ending" the circuit whilst the pump is still pumping which is bad. The valve opens to relieve the pressure, which is good.

 

The pressure at which the blow off operates can be adjusted by the coil spring. A spring can go weak thus opening too early or set too heavy which can pop seals, burst hoses or knacker pumps! If maximum pressure is set to 3000psi then spring weakens to 2000psi, then the rollers will appear weak and inefficient. A reset will bring about a transformation!

[not for sale sorry]

Thanks pete some great info:thumbup1: