TM5-3810-307-10
The upper drive housing, bolted to the bottom of the lower cylinder, contains the recoil
dampening system. The recoil dampening system consists of six cushion rings and the cushion
compression ring secured in the cushion housing by the cushion housing retainer plate. A
cushion shim ring can be installed in between the lower cushion ring and the cushion
compression ring in order to give a 1/8-inch (3.175 mm) cushion ring stack preload.
The lower drive housing, bolted to the bottom of the upper drive housing, is used to hold the
piles in place under the impact hammer during operation. It consists of a bell housing that
contains the striker plate and an 18-inch (45.7 cm) guide plate is bolted onto the bottom of the
bell housing. A striker plate cushion ring protects the bottom of the bell housing from damage
caused by the striker plate.
The fuel injection system consists of a fuel tank, fuel tank fill line and quick connect fitting, two
fuel tank suction strainers, fuel pump, two fuel injectors, throttle valve (needle block), fuel filter
assembly, fuel pump feed inline filter, fuel return inline filter, fuel pump feed shutoff valve, fuel
return shutoff valve, and associated lines and fittings.
The fuel tank, located on the side of the upper cylinder, provides fuel via gravity feed to the fuel
pump located on the front of the lower cylinder. The in-tank suction strainers, located inside the
fuel tank, filter the fuel prior to being delivered to and returned from the system. Two fuel tank
plug/vent valves, located on top of the fuel tank, are used to vent the system during impact
hammer operation.
The fuel tank is filled from the ground by connecting the quick connect fitting on the ground
fueling hand pump to the fuel tank fill line and quick connect fitting located at the bottom of the
lower cylinder and using the hand pump to pump fuel from an external JP-8 or No. 2 diesel fuel
source to the fuel tank on the impact hammer. If the external fuel source has its own pump, it
can be connected directly to the fuel tank fill line and quick connect fitting located at the bottom
of the lower cylinder and the ground fueling hand pump need not be used. The fuel tank fill line
and quick connect fitting on the impact hammer is identified by a red-colored "FUEL" label. In
the absence of the ground fueling hand pump, the fuel tank can be filled manually by removing
the fuel tank plug/vent valves.
The fuel pump, located on the front of the lower cylinder behind the fuel system guard, is an air-
activated, single plunger-type pump that pressurizes and pumps the fuel to the fuel injectors.
Inlet and outlet check valves on the fuel pump prevent fuel from flowing in a reverse direction.
The fuel injectors, located on each side of the lower cylinder, inject atomized fuel into the
combustion chamber to initiate combustion.
The throttle valve (needle block), located on the front of the lower cylinder behind the fuel
system guard, controls the stroke rate (blows per minute) by regulating the amount of fuel
returned to the fuel tank. The throttle valve (needle block) is hydraulically-controlled by the
remote throttle.
The fuel pump feed inline filter and fuel return inline filters, located behind the fuel system
guard, filter the fuel delivered to the fuel pump and returned to the fuel tank respectively. The
fuel pump feed shutoff and fuel return shutoff valves, also located behind the fuel system guard,
are used to turn off the fuel supply in their respective lines.
The fuel filter assembly, mounted on the side of the lubricating oil tank on the lower cylinder, is a
housing that contains a fuel filter element. The fuel filter assembly is downstream from the fuel
pump feed inline filter and further filters the fuel being delivered to the fuel pump.
A waste fuel drip tank receives waste fuel and oil from the fuel injectors and oil pump. A quick
connect fitting allows periodic draining of the waste fuel drip tank. The waste fuel drip tank vent
valve, located on top of the tank, is used to vent the system during impact hammer operation.
H-14 Change 1
