TM-9-2350-358-BD
HOWITZER, MEDIUM, SELF-PROPELLED, 155MM; M109A6
TECHNICAL MANUAL; OPERATOR’S, UNIT, AND DIRECT SUPPORT SUPPORT MAINTENANCE
MARCH 1994
TM-9-2350-358-BD - Page 325 of 343
TM 9-2350-358-BD
SECTION III.
PETROLEUM, OIL, AND LUBRICANT (POL) SUBSTITUTES
D-6.
SCOPE
This section provides information covering the types, uses, and effects of substitute fuels, lubricants, and hydraulic fluids
used in the M109A6 Howitzers.
It also contains general information covering after-use purging and system flushing
methods.
D-7.
GENERAL
There are three kinds of POL products fuels, lubricants (oil and grease), and hydraulic fluids.
These products vary greatly
in characteristics and chemical properties.
Never assume that since a product is used in a system of another type vehicle
it can be used safely in the same system in the M109A6 Howitzer.
Some POL will be destructive if used.
POL products
fall into three categories as follows:
a.
Primary:
The correct product for the system.
b.
Alternate:
A product that closely matches the primary but may result in reduced performance.
Using the
alternate POL will have no effect on the durability of the system.
There are no restrictions on the duration of use.
c.
Emergency:
A product that can be used for a short period of time only.
These products are a last resort only
and will result in a significant reduction in performance.
The use of an emergency fuel will not materially degrade the
design operating life of the howitzer.
D-8.
PRODUCT IDENTIFICATION
a.
POL Products are usually identified by NSNs or part numbers which identify the product, however,
specification numbers and product names may also be a means of identifying the product.
Guidance provided is keyed to
specification numbers, product names, application (automotive, aviation, marine), and the type of user (military,
commercial, and foreign).
b.
NATO Products can usually be assumed to be direct replacements for US Military products, but there are
some products which do not meet the same user applications.
The American Society of Testing and Measurements
(ASTM) specifications relate to commercial products found in the US.
Table D-4 identifies primary and alternate lubricants and hydraulic fluids.
The primary products listed are reflected in the
vehicle lubrication order.
The "Remarks" column contains specific details about the alternate product, when applicable.
Table D-5 lists primary, alternate, and emergency fuels for use in ground diesel fuel consuming equipment.
D-9.
FLUSHING LUBRICANT AND HYDRAULIC SYSTEMS
a.
For those systems using oils, flushing involves draining, refilling with proper product, operating to ensure
complete circulation and, when possible, stable operating temperature (this usually means at least 1/2 hour), a redrain,
and refill.
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, as a minimum, must be removed and cleaned.
While systems should not be
disassembled to inspect seals, maintenance organizations should be prepared to replace seals that show signs of leaking.
Organizations must observe seals on these systems during subsequent operations.
b.
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
repacked with the proper product.
D-11
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