750-392
CBEX-DE
5-17
Air Pump and Lubricating System
5.18 — Air Pump and Lubricating System
5.18.1 — Air Pump
The air pump itself requires little maintenance. However, the life of the pump is dependent upon a sufficient sup-
ply of clean cool lubricating oil. The oil level in the air-oil tank must be observed closely. Lack of oil will damage
the pump making replacement necessary. Disassembly or field repairs to the pump are not recommended.
FIGURE 5-11. Air Pump
5.18.2 — Lubricating Oil
Lubricating oil must be visible in the sight glass at all times. There is no specific level required as long as oil is
visible. Do not operate if oil is not visible.
Oil with proper viscosity must be used. SAE 20 detergent oil or ISO 68 hydraulic fluid are recommended; SAE 10
detergent is also permissible.
When adding oil, remove the cover from the fill pipe and add oil through the conical strainer in the pipe with the
unit running.
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.
5.18.3 — 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.
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.
OIL FILL PIPE & FILTER
AIR FILTER
AIR / OIL TANK
MOTOR
CHECK VALVE
SIGHT GLASS
(LUBE OIL LEVEL)
AIR PUMP
COMPRESSED AIR OUTLET
LUBE OIL
COOLING COIL
!
Caution
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