750-91 (revised 2009)
Model CB-LE Packaged Boiler Manual
8-21
8.19 — Air Pump and Lubricating System
The oil and its container should be clean. Although there is a strainer in the lube oil line, its purpose is to remove
any unwanted materials rather than to act as a filter for unclean oil.
8.19.3 — Lubricating 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 lubri-
cates 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 an 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 it is in place. A spare strainer basket can be obtained, if desired, and
used on a rotating basis while the other is serviced.
8.19.4 — 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.
8.19.5 — Air-Oil Tank
Pads of steel wool are used in the air oil receiver tank as a filtering medium to separate the lube oil from the com-
pressed 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:
1. Insert two pads into the cylinder.
2. Alternate the grain of the pads.
3. 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.
4. After the last pad is in place, slip the retainer screen onto the cylinder.
Oil must NEVER be added unless the pump is in operation and the strainer screen is in place. Failure to follow these
instructions could result in equipment damage.
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