OPERATION
PRE-CHECKS
CHECK FASTENERS FOR PROPER TIGHTNESS
See “NPK Sheet Pile Driver Instruction Manual” for proper fastener torque.
JAW TOOTH PLATE (CHUCK) INSPECTION
Check for jaw tooth wear.
If the chuck (sp5) is worn more than .12” to .16” (3 – 4 mm) per side and the sheet pile
slips out easily, replace the chuck jaws.
RUBBER MOUNT INSPECTION
The rubber mounts will eventually need replacing due to the hours of use or operator
abuse. The mounts are designed to work in a temperature range of 0° to 160°F
(-18° to 70°C). Below 0°F (-18°C), the rubber mounts become very stiff and not as
effective in reducing vibration. Above 160°F (70°C), the rubber mount material
becomes too soft and wears fast. Excessive down force on the Sheet Pile Driver,
overstretches the rubber and can lead to early mount failure. Petroleum products and
solvents will degrade the rubber.
Cracks may appear in the body of the rubber (AD1) or where the rubber bonds to the
metal plates (AD2). Light surface “checking” due to age is acceptable. If cracks
propagate into the body of the rubber, the mount must be replaced immediately. If the
crack is located at the rubber to metal plate bond, and is over 4 inches (100 mm) long,
or 1-1/2 inches (38 mm) deep, the mount must also be replaced.
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