750-392
CBEX-DE
5-29
Linkage Systems
5.23 — Linkage Systems
(Boilers with single-point positioning)
The burner air control damper should be checked for free movement as a part of the monthly inspection. With
the burner off and the jackshaft damper control rod disconnected, the air control damper should rotate freely
through its entire range of movement. Any resistance to movement or excessive play in the support bearing
should be investigated and corrected before the burner is put back in operation.
The overall tightness of the linkage assembly should be checked monthly. If necessary, tighten the setscrews and
the connections at the uniballs. Check the uniballs for wear and replace if necessary.
The linkage assembly should be tight but should not bind. If the linkage assembly is binding, determine the
cause of the binding and correct as necessary.
Linkage rod end attachment points should be marked on the variable displacement linkage arms as an aid in
subsequent reassembly.
Inspection of the air damper and linkage bearings should be performed on a more frequent basis if the boiler is
operating in a dirty environment.
The fuel cam profile spring should be inspected monthly for wear, scoring or distortion. If any of the questionable
conditions are found, the spring must be replaced immediately to avoid the possibility of breakage in service. Use
care to avoid damaging the cam or spring during installation.
Lubricate occasionally with a non-gumming, dripless, high-temperature lubricant such as graphite or a silicone
derivative.
Combustion should be checked and readjusted whenever the burner is removed or any control linkage is dis-
turbed.
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