Here you’ll find everything you need to know about the installation and adjustment of a GMT grapple saw.
Please do not hesitate to contact our support if your problem is not listed here. View our contact options here.
Table of content
The rotator must be placed on the tilt frame in such a way that the G.O. (grapple open <>) coupling is located on the side of the accumulator. This will automatically mean that the G.C. (grapple close ><) coupling is located on the side of the chain oil reservoir.
Both hydraulic hoses must form a neat loop when attached to the nipples underneath the rotator. The short hose must rest inside the loop created by the long hose.
At all times, there should be a return-hose to the tank for the tilt-down function to work properly. For the felling grapple to perform properly, a drain valve must be attached to the crane valve block of the carrying vehicle. This valve is supplied in a ready-to-use state in the box containing the tools and fittings.
When using a rotating telehandler with only one double hydraulic function, a 6/2 valve should be installed on the jib. A different special valve has to be installed on this valve (these valves are not supplied as standard), which will generate the second double hydraulic function. An electric signal will take care of the controls for the second double function that is being created: the rotation of the grapple.
Please contact us directly if you have questions on installing the drain valve or 6/2-valve.
Do you want to install a quick coupler and grapple saw on a Palfinger Epsilon crane? Please download the instructions below.
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Pressure measurements and/or adjustments may only be performed by authorized persons. It is recommended that two persons work on adjusting the valve block. For detailed information please check the user manual.
For a basic understanding of the grapple saw we will explain the location and purpose of the different valves:
When filling the accumulator becomes necessary more frequently during normal operation, please check the following items:
If this part is in order and the problem still occurs, please contact us directly!
Watch the video
When the saw blade does not extend when the grapple close function is fully activated, please check the following items:
If all parts are in order and the problem still occurs, please contact us directly!
Is the saw blade not retracting? Please watch the video below.
When the grapple saw does not tilt down (grapple is closed and the saw is activated and keeps extended afterwards), please check the following items:
The video below explains how to adjust the pressure settings.
Do you want to know more? At GMT Equipment, we value personal attention and support. So please feel free to contact us. Then we will speak to you personally, in the way that is most convenient for you.
View the contact options here.