Cleaning And Inspection; General Guidelines - Doosan DX140R Shop Manual

CLEANING AND INSPECTION

General Guidelines

All parts must be clean to permit an effective inspection. During
assembly, it is very important that no dirt or foreign material
enters unit being assembled. Even minute particles can cause
malfunction of close fitting parts such as thrust bearing, matched
parts, etc.
Care should be exercised to avoid inhalation of vapors,
exposure to skin and creating fire hazards when using
solvent type cleaners.
1. Clean all metal parts thoroughly using a suitable cleaning
fluid. It is recommended that parts be immersed in cleaning
fluid and moved up and down slowly until all oils,
lubricants, and/or foreign materials are dissolved and parts
are thoroughly clean.
2. For bearings that can be removed, soak them in a suitable
cleaning fluid for a minute or two, then remove bearings
from cleaning fluid and strike flat against a block of wood to
dislodge solidified particles of lubricant. Immerse again in
cleaning fluid to flush out particles. Repeat above
operation until bearings are thoroughly clean. To dry
bearings, use moisture-free compressed air. Be careful to
direct air stream across bearing to avoid spinning bearings
that are not lubricated. DO NOT SPIN BEARINGS WHEN
DRYING; bearings may be rotated slowly by hand to
facilitate drying process.
3. Carefully inspect all bearing rollers, cages and cups for
wear, chipping or nicks to determine condition. Do not
replace a bearing cone or cup individually without replacing
mating cup or cone at the same time. After inspection, dip
bearings in light weight oil and wrap in clean lintless cloth
or paper to protect them until installation.
For those bearings that are to be inspected in place;
inspect bearings for roughness of rotation, scoring, pitting,
cracked or chipped races. If any of these defects are
found, replace bearings. Also, inspect defective bearing
housing and/or shaft for grooved, galled or burred
conditions that indicate bearing has been turning in its
housing or on its shaft.
4. It is more economical to replace oil seals, O-rings, sealing
rings, gaskets
disassembled than waiting for premature failures; refer to
latest Micro Fiche and/or Parts Book for replacement
items.
General Maintenance Procedures
Page 12
WARNING
and retaining rings when unit is
SP000016