TM 5-3810-307-24-1-2
Fuel System Throttle Valve (Needle Block). (Refer to Figure K-25.)
The throttle valve (needle block) is normally removed for replacement.
Removal.
a.
Remove the fuel system guard from the lower cylinder (Page K-57).
b.
Close the fuel pump feed and return shutoff valves (handles perpendicular to the lines).
c.
Using a suitable container to catch any hydraulic fluid, disconnect the hydraulic throttle
valve whip line (1, Figure K-25) from the throttle valve (needle block) (2).
d.
Using a suitable container to catch any fuel, loosen the hose clamp (3) securing the
rubber fuel line (4) to the fuel outlet fitting on the throttle valve (needle block) (2) and
disconnect the line from the fitting.
e.
Remove the five throttle valve mounting bolts (6) and lockwashers (7) securing the
throttle valve (needle block) (2) to the lower cylinder.
f.
Disconnect the braided fuel line (5) from the fuel inlet fitting on the throttle valve (needle
block) (2).
g.
Remove the throttle valve (needle block) (2) from the lower cylinder.
Installation.
NOTE
The fuel outlet fitting and hex head pipe plug (bleed screw) are secured in
the throttle valve (needle block) with Loctite 545 (purple).
a.
Align the throttle valve (needle block) (2, Figure K-25) with the mounting holes on the
lower cylinder.
b.
Connect the braided fuel line (5) to the fuel inlet fitting on the throttle valve (needle block)
(2).
c.
Place Loctite 272 (red) on the five throttle valve mounting bolts (6). Secure the throttle
valve (needle block) (2) to the lower cylinder with the five throttle valve mounting bolts
(6) and lockwashers (7). Tighten the bolts and torque to 60 ftlb (81 Nm).
d.
Connect the rubber fuel line (4) and hose clamp (3) to the fuel outlet fitting on the throttle
valve (needle block) (2). Tighten the hose clamp (3).
e.
Place Loctite 545 (purple) on the threads of the hydraulic throttle valve whip line (1) and
connect to the throttle valve (needle block) (2).
f.
Install the fuel system guard on the lower cylinder (Page K-57).
NOTE
Prior to starting the impact hammer, ensure fuel system has been bled by
bleeding air from the fuel inlet line at each of the two fuel injectors in
accordance with the Preventive Maintenance Checks and Services
(PMCS) Table in Appendix H of the Operator's Manual, TM 5-3810-307-10.
K-60 Change-1
