Table 3-4. Troubleshooting - Continued
Malfunction
Probable cause
Corrective action
i. Restriction of oil flow caused by
i.
Inspect check valve for proper
improper operation of safety
operation Removal is necessary to
unloader assembly
valve outlet to unloader valve.
2.
a.
Lack of lubricating oil in right-
a. Fill right-angle drive housing see
angle drive housing.
LO 92590-213-12.
b.
Gears worn.
b. Remove and replace worn gears
c.
d.
Improper backlash.
e.
e. Remove and replace worn
f.
Seals damaged.
3.
Moldboard fails to rise high
a.
Linkage distorted or obstructed.
a. Inspect linkage at front of vehicle
enough to engage carring hooks.
rocks wedged between members
Remove obstructions
b.
b. Check the carrying hooks for
looseness of shaft Correct the
position of carrying hooks on shaft
4.
Moldboard fail to dig properly.
a.
Moldboard cutting edge loose or
a. Inspect cutting edge for looseness
worn.
and tighten attaching bolts if
required. If cutting edge is
excessively worn, reverse or
b.
Moldboard or attaching linkage
b. Check for misalinement of
damaged or loose.
moldboard pushbeams or tilt
Tighten loose components
conjunction with the malfunction approach in
c. Direct Approach. The direct approach may be
troubleshooting the bulldozer. The table contains a list
used when a malfunction is encountered. Find the
of various malfunctions which may occur during
appropriate troubleshooting routine index table 3-5.
operation of inspection of the vehicle. The malfunctions
This table contains a listing of trouble indicating
are grouped by systems (control assembly,
elements which are arranged alphabetically and keyed
electromagnetic clutch system, hydraulic cylinder piping
to applicable troubleshooting routines. From table 3-5,
and guards, etc.). Each malfunction is followed by a list
select the proper troubleshooting routine for
of probable causes. These causes are listed in the
troubleshooting the malfunction encountered. With the
aid of the referenced troubleshooting routine, and
order when troubleshooting. Following each probable
supporting data (schematic diagrams and locational
cause are instructions for performing corrective action.
views), the exact cause of the trouble and the required
Table 3-4 provides either specific instructions for
corrective action may be determined.
correcting the fault, or references to a specific
3-39. Troubleshooting
Table
(Malfunction
troubleshooting routine.
Approach)
3-9