NPK PH1 Operator's Manual page 33

OPERATION
OPERATING TECHNIQUES & PRECAUTIONS
DO NOT SLANT HAMMER
For the most efficient demolition, align the direction of force (51) from the boom with the
penetration direction (52) of the tool (HH). Failure to do this decreases the transfer of
energy from the piston to the rock and increases the bending forces at the fulcrum of
the tool. This unnecessary added stress leads to the following problems:
1. Premature wearing of the tool bushings and/or tool breakage.
2. Breakage of tie rods.
3. Breakage of bracket bolts.
When the tool is working at the incorrect angle, it will bind causing the sound of the
hammer to change.
Keep the boom direction of force (51)
in the same direction the tool is
penetrating. Use the boom cylinder
to preload the hammer (apply down
force), and use the bucket and stick
cylinders for alignment. Keep the tool
tangent to the arc of the boom (54).
- 32 -