of unauthorized modifications, and be certain that
troubleshooting procedures to be perish p while a
authorized modifications have been incorporated.
disabled component is still mounted on the vehicle and
d. Bleed System. Air in the hydraulic system can
after it has been removed.
b. The inceptions made while the component is
cause many malfunctions which might be falsely
attributed
to
a
system
component
Before
mounted on the vehicle are for the most part visual and
troubleshooting the bulldozer hydraulic system, bleed
are to be performed before attempting to operate the
the system to remove all air bubbles, and inspect
bulldozer.
The object of these inceptions is to
condition of hydraulic lines. Replace all damaged lines.
determine the condition of the component, and if found
Refer to organizational maintenance section for
defective, to take precautions to prevent further
instructions for bleeding the system.
damage.
e. Begin Troubleshooting. The troubleshooting
c. Inspection after the component is removed from
procedures have been divided into several table. Start
the vehicle is performed to verify the diagnosis made
by checking out the operation of the system to locate the
when the component was on the vehicle, to uncover
malfunction to a particular component When the faulty
further defects, or to determine malfunctions if the
component has been determined, refer to the table
component alone is received from lower categories of
which details the troubleshooting procedure for the
maintenance. This inspection is particularly important in
faulty component, and proceed to isolate the probable
the last case because it is often the only means of
cause of component malfunction.
The component
determining the malfunction without completely
troubleshooting tables also contain malfunctions which
disassembling the component.
may be evidenced by testing the component after it has
4-15. Troubleshooting Technique.
been removed from the system.
Often a faulty
4-16. Do not operate any power-actuated components
component will be returned for overhaul with no
in the vehicle prior to completing the procedures below.
recorded indication of the malfunction which caused it to
Careful manual operation, where applicable, may be
be removed from the system. In these cases, utilize
performed to determine normal or abnormal functioning
only those portions of the component troubleshooting
where indicated in the procedures.
table which can be applied to a component not installed
4-17. Detail Procedure.
in a system.
a. Inspect Appearance. The appearance of an
4-18. Troubleshooting Procedures.
assembly or component will indicate its general
a. Moldboard Assembly Components. Refer to
condition and will reflect the type of treatment it has
received. Examine for dented surfaces, bent or broken
b. Cylinder and Ram Assembly Components.
lines or parts, fungicidal growth, moisture, corrosion, dirt
or other foreign matter, wear, oil stains, bare wire, worn
insulation, tampering, and other evidence of misuse
d. Control Handle Box Assembly Components.
which might indicate the source of trouble and the need
Refer to table 4-5.
for repairs.
e. Electromagnetic Clutch Assembly Components
Refer to table 4-6.
components are present and are properly mounted.
f. Power Take-Off Transmission Assembly
Secure or replace as required.
c. Inspect Modifications. Check for the presence
Components. Refer to table 4-7.
4-3
