TM 5-3810-307-24-1-2
Table K-5. Impact Hammer Troubleshooting (Continued)
Symptom
Probable Cause
Corrective Action
Spotter (Continued)
6.
Troubleshoot crane hydraulic system in
Spotter extends/retracts
6.
Hydraulic hose reel lines portion of
accordance with Section 5, Trouble-
erratically. (Continued)
the crane hydraulic system not
shooting in Volume 1 of 2 of the
functioning properly.
Organizational, General Support, and
Direct Support Maintenance Manual, TM
5-3810-307-24-1-1.
1.
Place the TELE/CLAMSHELL selector
1.
The TELE/CLAMSHELL selector
Spotter will not extend/retract
switch, in the superstructure cab, in the
switch, in the superstructure cab, is
CLAMSHELL position
not in the CLAMSHELL position.
2.
Improper connection of the hydraulic
2.
Reconnect hydraulic hose reel lines
hose reel lines to the hydraulic hose
properly.
connections (spotter manifold) on the
spotter.
3.
Clogged, broken, or loose hydraulic
3.
Clean, tighten, or replace hydraulic lines
lines or fittings.
or fittings.
4.
Damaged hydraulic cylinder.
4.
Replace hydraulic cylinder.
5.
Bent outer or inner box sections.
5.
Replace outer or inner box section(s).
6.
Hydraulic hose reel lines portion of
6.
Troubleshoot crane hydraulic system in
the crane hydraulic system not
accordance with Section 5, Trouble-
functioning properly.
shooting in Volume 1 of 2 of the
Organizational, General Support, and
Direct Support Maintenance Manual, TM
5-3810-307-24-1-1.
Throttle Valve (Needle Block) and Fuel Pump Test
The Throttle Valve (Needle Block) and Fuel Pump Test should be performed if the troubleshooting
steps in the Hammer Trip and Fuel System sections of Table K-5 have not determined the problem.
Test Procedure.
a.
With impact hammer standing upright, open the fuel tank plug/vent valves and the fuel
pump feed and fuel return shutoff valves. Connect the hydraulic hose from the remote
throttle to the throttle valve (needle block) whip line on the impact hammer (labeled
"THROTTLE CONNECTION").
b.
Close the pressure relief valve on the remote throttle and pump the remote throttle to
550 psi (38 bar). This should cause the throttle valve (needle block) to close fully and
prevent fuel from flowing, via gravity, in the fuel return line from the fuel tank to the fuel
pump.
c.
Disconnect either fuel injector line at the fuel injector and drain any remaining fuel. Use
a suitable container to catch the fuel.
NOTE
Only a small amount of fuel should flow out.
K-32 Change-1
