This descriptive guidebook will familiarize you with
COMMERCIAL Model 15H single and tandem pumps
and motors - their component parts - relative position of
each part - proper methods for assembly or disassembly
of units - care and use of .these oil hydraulic units so
that better performance and greater life expectancy will
result for your benefit.
A photographic presentation with explanatory notes
covers the steps that should be closely followed when
servicing the elements that comprise these units.
Before any work is done in the repair of these units. it is
suggested that all of the steps used in tearing down the
assembled unit and all of the steps used in building up
the unit be read. Such a digest will familiarize you with
the general procedure of the work to be done and give
you the feel of the specific operations involved.
general instructions ...
Here you .have a gear type fixed displacement oil
hydraulic pump or motor which has been built to very
high standards and a new design. The result is the
characteristics far superior to other pumps and motors
of its type. Close fits and small running tolerances were
originally built in to insure peak performance and
highest operating efficiency.
Slippage is a factor which has considerable bearing on
the performance. As the amount of slippage is reduced,
the higher the operating efficiency. Best results develop
when a close fit is made between the gears and all
surfaces they come in contact with. Allowance of a
minimum running clearance is, of course, necessary.
Inspection of all COMMERCIAL pumps and motors will
equipment, made by COMMERCIAL on specially built
machines which produce surfaces within limits much
closer than is standard practice.
Seldom should you find it necessary to service the
Model 15H oil hydraulic pump or motor during its life
performance occur it is advisable to make an inspection
and replace such part or components which, due to
some unusual condition, may have become worn.
Should you find it advisable to replace the gears, insist
that they be in matched pairs and the product of the
original manufacturer. Matched gears are the very
vitals of the gear type pump or motor. Expendable parts
such as "0" ring shaft seals, pocket seals, single and
double-lip oil seals and back-up rings should never be
re-used even though inspection may show these items
as being serviceable for future use. Such parts for
replacement are available at a cost which is insignificant
in view of your investment and when you consider the
vital function of these items is to prevent leakage. All
replacement parts should be given your final inspection
to insure that no damage has resulted after final factory
inspection was made.
All parts of the units with the exception of the outboard
bearing are lubricated by the hydraulic oil in the circuit.
Particular attention must be paid to keep the oil in the
circuit system clean. Whenever there is a pump or
motor failure and there is reason to feel that metal
particles may be in the system. the oil must be drained,
the entire system flushed clean, and any filter screens
thoroughly cleaned. New oil should be supplied for the
entire system. Oil suitable and recommended for use in
circuits involving Model 15H pumps and motors should
meet the following specifications:
Hydraulic oils should have a viscosity index of 90
or higher and a viscosity SUS 150 to 200 at
100°F. Aniline point should be 165 or higher. Oil
operating temperatures should not exceed 200°F.
Oil should have anti-foam and anti-oxidation
Do not use low viscosity naphtha base oils,
aircraft hydraulic fluid, or hydraulic brake fluid.
Oil with a low pour point should be used when
operation is to be in cold, low temperature
At regular intervals the outboard bearing should be
lubricated. You are cautioned that not all lubricants are
satisfactory for proper lubrication of the outboard
bearing. Results from tests and field operation indicate
that a lubricant such as Texaco Starfak #2 is
Commercial Shearing, Inc. 1964