A pile gate, able to accommodate up to 18-inch (45.7 cm) diameter piles, is attached to the
bottom lead section to assist in properly aligning the piles during operation. The pile gate
consists of a pile gate frame, swing arm, and latch. Weight data is stenciled on the sides of the
pile gate and warning and lift point location decals are also located on the pile gate.
An impact hammer stop, installed near the top of the lead tower by removable bolts, replaces
the anti-two block function of the Load Moment Indicator (LMI) system for pile driving
operations. The impact hammer stop physically prevents the impact hammer from colliding with
the boom nose by limiting its vertical travel.
The anti-two block function of the Load Moment Indicator (LMI)
system is disabled and not used during pile driving operations.
Weight, impact hammer orientation (UP), and center-of-gravity location are stenciled on the
individual lead tower sections.
The spotter is a hydraulically-operated, adjustable, mechanical link attached to the bottom lead
section and the crane superstructure to provide stability to and control the location and pitch of
the lead tower. The spotter is attached to the bottom lead section via the spotter slide and to
mounting lugs on the front of the crane superstructure via brackets and two support pins. The
hydraulic connections are provided by the boom hose reel on the crane and connected to two
hydraulic connections (spotter manifold) located on the right-hand side of the spotter base (at
crane superstructure mounting bracket). A hydraulic hose retention chain, attached to the base
of the spotter, is used to secure the hydraulic hose reel lines. The spotter is extended and
retracted by the telescope/clamshell control pedal in the superstructure cab (when the
TELE/CLAMSHELL selector switch is in the CLAMSHELL position).
The spotter consists of two telescoping inner and outer boxes with short and long wear pads on
each, a hydraulic cylinder (3-inch (7.6 cm) diameter x 96-inch (2.4 m) stroke), and spotter slide.
The spotter slide, connected to rails on the rear of the lead tower, allows vertical adjustment of
the spotter connection to the lead tower. A pin on the spotter slide engages holes on the rear of
the lead tower to hold the spotter slide in place along the rails. A manual release on the spotter
slide can be operated by a tag line and enables the pin to be disengaged to allow vertical
movement of the spotter slide along the rails. A retainer pin can be used to hold the manual
release (and spotter slide pin) in the disengaged position during height adjustment. Two
lubrication fittings, located on each side of the spotter slide, enable lubrication of the spotter
Warning and weight data is stenciled on top of the spotter. Warning, lubrication location, and lift
point location decals are located on the spotter. In addition, a decal illustrating crane signals
and additional pile driving hand signals is attached to the left-hand side of the spotter.
The impact hammer is a self-contained, diesel engine-driven, direct drive-type pile driving
hammer operating on compression/ignition, two-cycle operation. The impact hammer utilizes an
air-activated, high pressure fuel injection system with a fuel tank and air-activated, pressurized
lubrication system with attached oil tank. Startup of the impact hammer is controlled by an
integrated hammer trip system with trip safety lock.
The main components of the impact hammer are the piston and impact block, upper and lower
cylinders, hammer trip assembly (mechanical starting device), fuel injection system, lubrication
system, and direct drive system that houses a recoil dampening system and striker plate
Change 1 H-9