TM 5-3810-307-24-1-2
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.
The lubrication system provides lubricating oil to the lower cylinder and piston during operation. The
system consists of the lubricating oil tank, oil tank fill line and quick connect fitting, oil pump, oil pump
feed shutoff valve, oil pump inline priming pump, and associated lines and fittings.
K-12 Change-1
