Table 3-2. Quarterly "Q" Preventive-Maintenance Services
(Organizational)
Intervals
Procedure
Quarterly "Q"
(or 750 miles)
INSPECTION AND ROAD TEST
Hydraulic system Operate bulldozer. Check for oil leaks at hydraulic cylinders and all hydraulic
X
lines and connections
Hydraulic control system. Operate bulldozer. Check for hydraulic leaks at oil pump, oil reservoir,
X
and directional control valve and oil line connections.
Carrying hooks Operate the carrying hooks control handle to determine whether hooks will
X
properly engage and disengage the moldboard.
MAINTENANCE OPERATIONS
X
Lubrication. Lubricate in accordance with lubrication order (LO 9-2590-213-12).
Moldboard carrying hook arms, push beams, and trunnion cap assemblies Examine carefully for
X
cracks or distortion.
Pins. Examine pins which attach the moldboard to the push beams, push beams to the mounting
X
brackets, upper arms to the trunnion and cap assemblies, upper arms to the moldboard, and the
hydraulic cylinder piston rams to the push beams. Also, examine the stub shafts by which the
hydraulic cylinders are retained in the trunnion and cap. assemblies Check for distortion and
wear. Tighten nuts and/or bolts which secure the pins Tighten all screws that support the cylinder
brackets to the front eyes on the hull.
Carrying hooks shafts. Examine shafts for distortion Tighten carrying hooks screws and
X
setscrews.
Hydraulic cylinders Examine hydraulic cylinder piston rams for distortion and scoring. Tighten
X
the screws securing the hydraulic cylinder heads to the cylinders and screws securing piston ram
packing glands to cylinder heads Check tightness of all screws securing cylinder guards to
cylinder brackets.
Cables. Examine emergency lift cables for fraying and/or loose connections.
X
Directional control valve and moldboard control handle. Test operation of the bulldozer and note
X
the reaction to positions selected. Check moldboard control handle (fig. 2-1 for distortion and
excessive play.
X
Hydraulic pump and mount assembly. Tighten all mounting screws Check clutch equipment.
Guards-hydraulic lines reservoir, directional control valve Check all screws, nuts, and bolts for
X
tightness
bent or twisted, not chafed or burned, not broken or
3-23. The following general procedures apply to both
cracked, not bare or frayed, not dented or collapsed, not
operator
and
crew
organizational
preventive-
torn or cut, and not deteriorated.
maintenance service, and all inspections. The general
b. Inspection of a unit to see that it is correctly
procedures are just as important as the specific
assembled or stored is usually a visual inspection. The
procedures.
inspection determines if the unit is in its normal position
in the vehicle and if all its parts are present and in their
3-24. Inspections will be made to assure if items are
correct relative positions.
in good condition, correctly assembled or stored, secure,
c. Inspection of a unit to see that it is "secure" is
not excessively worn, not leaking, and adequately
usually a visual, hand-feel, prybar, wrench, or
lubricated. Any or all of these checks that are pertinent
screwdriver inspection for looseness in the unit. This
to any item (including supporting, attaching, or
inspection will include brackets, lockwashers, locknuts,
connecting members) will be performed automatically,
locking wires, and cotter pins as well as connecting
as general procedures, in addition to any specific
tubes, hoses, or wires.
procedures given.
a. Inspection for "good condition" is usually visual
inspection to determine if the unit is safe or serviceable.
Good condition is explained further as meaning: not
3-3