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Always use pins with the same diameter and length. Replace a bent pin immediately. If this
is not done, the machine can become unstable. Do not use thicker and/or longer pins than
we supply.
Shorter (ground off) pins can be used when shallower pricking is desired. Be aware that the
operating depth indicated on the decal is only accurate when the maximum length of the pin
is used.
When oval holes are created, this means that there is a weak top layer with a hard layer
underneath. Use thinner pins or wait until the (wet) top layer has dried.
When top dressing must be applied, apply it before using the Verti-Drain.
When the ground is difficult to prick, water the soil first, use thinner and shorter pins, or
adjust the operating depth. If these measures are not taken, the machine will eventually be
damaged.
16.1.2 HOLLOW PINS
The ground can be mixed with hollow pins. Various sizes are available; see the parts page
for more information. The opening of the pin must be directed toward the rear of the
machine.
For hollow pins it is important that the pin angle is set to 90 degrees. The movement of the
pin in the ground is minimal and in this manner a nice “clean” hole is made. When the pin
continuously moves in the ground at an angle less than 90 degrees, the pin may eventually
break.
When top dressing must be applied, use the Verti-Drain first, remove the “cores” and then
spread the sand.
When lots of waste occurs while pricking with hollow pins, reduce the rotational speed or wet
the soil first. The waste can increase the rate of wear to your machine.
If the turf is damaged, first use solid pins to establish a healthy root system and then adjust
the operating depth.
When the hollow pins become plugged, this means that the ground is (very) compact and
solid pins must be used first to break the ground open. Wetting the soil or adjusting the
operating depth can also help solve this problem.
