TM 5-3810-307-24-1-2
Table K-5. Impact Hammer and Spotter Troubleshooting
Symptom
Probable Cause
Corrective Action
Hammer Trip System
The hammer trip mechanism
1.
The impact hammer is not resting
1a. Ensure impact hammer is resting fully on
in the hammer trip assembly
fully on the pile.
the pile.
does not engage.
1b. Ensure striker plate is in up position,
resting fully on pile, and not stuck in bell
housing in an intermediate position.
2.
The hammer trip assembly will not
2a. Ensure there are no obstructions.
descend fully.
2b. Ensure that the trip safety lever and pin is
pulled over spring tension.
3.
The cam (and lifting pawl) in the
3.
Check all mounting bolts and roll pins.
hammer trip assembly does not rise
to a vertical position.
4.
The piston is not in the proper
4a. Lower the piston so that it rests on the
position for hammer trip engagement.
impact block. The lifting collar of the
piston should be four inches (10 cm)
above the cam in the hammer trip
assembly when in the vertical position.
4b. If the piston will not lower onto the impact
block, check for any obstructions (i.e.
broken compression ring
wedged
between the piston and the impact block
or between the piston and the cylinder
wall.)
5.
The lifting pawl in the hammer trip
5a. Check for worn lifting pawl in the hammer
assembly does not engage the lifting
trip assembly.
collar of the piston.
5b. Ensure the trip engage lug is properly
engaging the cam in the hammer trip
assembly.
6.
The leaf spring does not hold the
6.
Replace the leaf spring in the hammer
cam of the hammer trip assembly in
trip assembly.
the over-center position.
The hammer trip mechanism
1.
The hammer trip track rails are worn
1.
Replace worn or bent hammer trip track
in the hammer trip assembly
or bent.
rails.
does not disengage.
2a. Tighten trip gib mounting
bolts on
2.
The trip gibs on the hammer trip
hammer trip assembly.
assembly are worn or mounting bolts
may be loose.
2b. Replace trip
gibs
on
hammer
trip
assembly.
The piston releases prior to
1.
The hammer trip track rails are worn.
1.
Replace worn hammer trip track rails.
full hammer trip assembly
2.
The trip gibs on the hammer trip
2a. Tighten trip gib mounting
bolts on
height.
assembly are worn or mounting bolts
hammer trip assembly.
may be loose.
2b. Replace trip
gibs
on
hammer
trip
assembly.
Fuel System
The impact hammer will not
1.
The fuel tank is empty
1.
Fill the fuel tank with the proper fuel.
start.
2.
The fuel pump feed shutoff valve is
2.
Ensure the fuel pump feed shutoff valve
not fully open.
is fully open (handle parallel to the lines).
Also ensure the fuel return shutoff valve
is fully open.
3.
The fuel plug/vent valves on the fuel
3.
Ensure the fuel plug/vent valves on the
tank are not open.
fuel tank are fully open.
K-28 Change-1
