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Chapter 2
Oil Strainer and Cooling Coil
Air pressure from the pump forces lubricating oil from the
tank through a cooling coil to the pump. The oil lubricates the
pump bearings and also provides a seal and lubrication for the
pump vanes.
The cooled oil flows to the pump through the strainer in the
filler pipe. It is possible to visually verify oil flow during
operation by removing the filler cap and checking the flow. If
necessary, the strainer may be cleaned during operation.
In the event it is necessary to clean the strainer during
operation, clean it and replace immediately. It can be cleaned
by immersing in solvent and blowing it dry with compressed
air. Do not operate without the strainer any longer than
necessary, and never add new oil unless the strainer is in
place. A spare strainer basket can be obtained, if desired, and
used on a rotating basis while the other is serviced.
Air-Oil Tank
Pads of steel wool are used in the air-to-oil tank as a filtering
medium to separate the lube oil form the compressed air.
The pads play a very important role and should be replaced
semi-annually. It is also important that a proper grade of steel
wool be used. Only No. 3 coarse grade American steel wool
or equivalent (CB919-124) should be used. Three pads are
required. When replacing the wool, insert two pads into the
cylinder. Alternate the grain of the pads. Install the spacer
with its stub end toward the opening and fit one pad over the
stub. Be careful not to overly compress the wool and be sure
that it is fluffed out to fill all available space. Improper
packing can cause high oil consumption. After the last pad is
in place, slip the retainer screen onto the cylinder. Be sure to
fit an o-ring gasket under the cover so that a tight seal is
obtained.
Follow previous instructions for oil replacement.
2-10
Air-Oil Tank
Air Cleaner
Never operate the air pump without the air cleaner in place.
The cleaner itself must be periodically checked and its
element flushed and cleaned semi-annually.
Flexible Coupling Alignment
Alignment of the pump and motor through the flexible
coupling is extremely important for trouble free operation.
Check the coupling alignment semi-annually and replace the
coupling insert as required. Keep the coupling guard in place.
The most commonly used tools for checking alignment are a
small straightedge and a thickness gauge.
The coupling must be checked for both parallel (offset)
a l i g n m e n t a n d a n g u l a r ( g a p ) a l i g n m e n t . P a r a l l e l
misalignment exists when shaft axes are parallel but not
concentric. Angular misalignment is the reverse situation,
with shaft axes concentric but not parallel.
Checking parallel alignment, both horizontal and vertical, can
be accomplished by laying a straightedge across the coupling
halves and checking with a thickness gauge to obtain the
amount of misalignment. The check should be done on the
top of the coupling and at 90 degrees. A useful aid is to hold
a flashlight behind the straightedge so that any gap can
readily be seen.
Shim stock of appropriate thickness and area is then used
under either the feet of the pump or the motor to establish
parallel alignment. A tolerance of .008" is a permissible limit.
After parallel alignment is established, check for angular
alignment, which is done by checking the gap between
coupling halves. The coupling should have a minimum gap of
1/16" and a maximum of 3/32".
Set the spacing between the halves at one point by using a
thickness gauge and then rotate the coupling slowly to be sure
that clearance at that point remains the same through 360
degrees of rotation. Adjust to obtain proper gap by loosening
the hold-down bolts and shifting either the pump or the motor
as required. Generally, a slight tapping on either the front or
Profire EV/LNEV Burner
750-364
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