Chapter 8 — Inspection and Maintenance
Part No. 750-184 8-17
15.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.
16.Restore oil flow. Test fire the burner at various firing rates being certain
that the metering stem freely follows the cam.
17.Tighten the packing gland after a period of operation, if necessary, to
maintain proper tension on the packing. Do not overtighten.
If there are indications that the oil metering valve has become clogged at its
orifice, it will be necessary to disassemble the control to remove the
obstruction. Clean the slotted stem of the oil metering valve with suitable
solvent and blow-dry with an air line. Follow the procedure outlined above
when removing or reinstalling 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
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.
S. AIR PUMP AND LUBRICATING SYSTEM
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.
Lubricating Oil
Lubricating oil must be visible in the gauge 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 is recommended,
although 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.
Oil must NEVER be added unless the pump is in operation
and the strainer screen is in place. Failure to follow these in-
structions can cause damage to the equipment.
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.
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