Chapter 7 Inspection and Maintenance
7-8 750-177
F. Oil Burner Maintenance
Refer to the burner sections for specific information regarding operation and maintenance of the burner.
Oil strainers should be serviced frequently in order to maintain a free and full flow of fuel to the burner.
Installation of a vacuum gauge in the burner supply line between the burner oil pump and the strainer is
strongly recommended. Regular observation and recording of the gauge indication will assist in determining
when the strainer needs servicing.
Strainer Servicing
The fuel oil strainer element must be removed and cleaned or replaced at regular intervals, or when a rising
trend in the burner supply pump suction indicates blockage. When servicing the strainer, fuel supply and
return line valves should be shut off. The strainer should be drained of oil and any sediment collected at the
bottom of the canister. Remove the cover and withdraw the strainer element. Replaceable elements should be
disposed of properly. Reusable elements may be cleaned by immersing them in solvent until attached deposits
have been loosened, and then shaking them dry.
Use only safety type solvents such as Cleaver-Brooks “Safety Solvent” for cleaning strainers or other
components. Work only in a well ventilated area. Do not use gasoline or other flammable liquids as a solvent.
Do not dry the strainer elements with compressed air. Failure to heed this warning could result in serious
personal Injury or death.
Reassemble the strainer, taking care to seal the canister properly to avoid air infiltration and resulting loss of
suction. Open the fuel supply and the return line valves.
G. Gas Burner Maintenance
Refer to the burner sections for specific information regarding operation and maintenance of the burner. The
motorized gas valve requires little maintenance, as the operating mechanism is immersed in oil and
completely sealed. However, proper operation should be checked on a routine basis.
Keep the outer parts of the valve(s) clean, especially the stem between the operator and the valve. A nicked,
scored, or otherwise damaged valve stem can cause leakage. Do not remove dust covers if installed.
The stem packing gland is the O-ring type. If oil is noticed around the operator base, or if leakage occurs, the
valve must be repaired. If the actuator is sluggish or fails to operate, and the oil level is known to be correct,
the operator portion should be replaced.
Solenoid Valves
Foreign matter between the valve seat and the seat disc will cause leakage. Valves are readily disassembled;
however, care must be taken to see that internal parts are not damaged during removal and that reassembly
is in the proper order.
A low hum or buzzing will normally be audible when the solenoid coil is energized. If the valve emits a loud
buzzing or a chattering noise, check for proper voltage. If voltage is correct, clean the plunger assembly and
interior plunger tube thoroughly. Do not use any oil. Make sure that the plunger tube and solenoid are tight
when assembled. Take care not to nick, dent, or damage the plunger tube.
Solenoid coils can be replaced without removing the valve from the line.
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