750-368
CBEX Elite 100-1200 HP
8-19
8.17 — Air Pump and Lubricating System
17. Depress the valve stem and replace the linkage assembly. SINGLE-POINT SYSTEMS: Depress the valve stem and
replace the cam. Mate the match-marks and secure the setscrews. Be sure the cam spring is centered in the
roller.
18. Restore oil flow. Test fire the burner at various firing rates being certain that the metering stem moves freely.
19. Tighten the packing gland after a period of operation, if necessary, to maintain proper pressure on the packing.
Do not over-tighten.
If there are indications that the oil metering valve has become clogged at its orifice, it will be necessary to disas-
semble the control to remove the obstruction. Clean the slotted stem of the oil metering valve with suitable sol-
vent and blow-dry with dry shop air. Follow the procedure outlined above when removing or re-installing the
metering valve stem. Also check all fuel line strainers.
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
foreign 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 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 8-17. Air Pump
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
AIR FILTER
LUBE OIL
COOLER
AIR / OIL TANK
MOTOR
AIR PUMP
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