CleaverBrooks 4WI, Operation, Service And Parts Manual

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750-211 (revised 2009)
Promethean Boilers, Model 4WI Manual 8-23
8.17 — Air Pump and Lubricating System
Should a pressure adjusting or relief valve become clogged, disassemble by releasing the locknut and backing off
the screw to relieve tension on the diaphragm. Remove the valve cover and the diaphragm to expose any dirt or for-
eign material which may have entered the valves. Clean out carefully and reassemble. It is recommended that the
diaphragms be replaced annually.
8.17 — Air Pump and Lubricating System
8.17.1 — Air Pump
The air pump itself requires little maintenance. However, the life of the pump is dependent upon a sufficient supply
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 8-28.
Air Pump
8.17.2 — 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 visi-
ble. Do not operate if oil is not visible.
Oil with proper viscosity must be used. SAE 20 detergent is recommended, although SAE 10 detergent is also per-
missible.
When adding oil, remove the cover from the fill pipe and add oil through the conical strainer in the pipe with the
unit running.