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TM 9-2320-356-BD
D-3.
LUBRICANTS AND HYDRAULIC FLUIDS
a.
This section lists a few elementary characteristics of importance, although
there are no expedient means of measuring or predicting them. A list of basic
fluids which can be used is provided in order of priority. Cautions on
incompatible fluids are mentioned and a means suggested to flush the system.
Table D-2 provides a list of basic fluids which can be used as substitutes
(alternate and expedient).
It is structured around the vehicle lube order.
Alternate products shown are NATO equivalents to the US specifications and can
really be considered as primary fluids.
There are no corresponding ASTM
designators.
The expedients are emergency only substitutions. They may cause
three problems, either individually or in combination.
(1) They may not al low proper or efficient operations because of improper
viscosity.
(2) They may cause high wear rate because of improper viscosity.
(3) They may cause seal damage or create deposits because of improper chemical
composition.
c. There are no established time constraints on these expedients, but the
shorter the time used the better.
D-4.
FLUSHING LUBRICANT AND HYDRAULIC SYSTEMS
a.
Expedient lubricant and hydraulic fluids must be removed as soon as
possible, and the system cleaned and inspected.
b.
For those systems using oils, flushing involves draining; filling with the
proper product; operating to ensure complete circulation and, when possible, stable
operating temperature (this usually means at least 1/2 hour); a redrain; and fill.
For the transmission and hydraulic system,
a second period of operations and a
third drain and refill are needed.
Installation of new filters is desirable.
Filters must as a minimum be removed and cleaned.
Operate without filters only
as a last resort .
While systems should not be disassembled to inspect seals,
maintenance organizations would be prepared to replace seals that show signs of
leaking.
Organizations must observe seals on these systems during subsequent
operations.
c.
For systems using grease,
it is normally necessary to disassemble the system
and wash the parts, especially the bearings, in a suitable solvent.
The parts are
then wiped dry,
inspected for wear and pitting, replaced if needed, and packed with
the proper product.
D-3
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