750-91 (revised 2009)
Model CB-LE Packaged Boiler Manual
8-33
8.22 — Lubrication
When opening the door, either for routine maintenance or for an annual inspection, do not do so when the boiler
or the door is hot. The refractory will hold its temperature for some time and exposure to ambient temperature or
rapid cooling may cause refractory cracking and/or harm to the boiler and door metal.
Be certain that the davit arm is under tension before opening. Failure to follow these instructions
can result in serious personal injury or death.
Before loosening the door bolts, tighten the nut on the davit stud to ensure tension on the davit arm. Putting the
davit arm under tension will help eliminate sagging, and will facilitate opening and closing.
The opened door should be supported by blocking or jacking to eliminate possible deformation of the door.
After opening the rear door, clean the flange with a scraper or wire brush. Clean the surface of the refractory
carefully with a fiber brush to avoid damaging the surface. Clean the mating surfaces of the baffle and the boiler
shell. Remove all dried sealing material.
Remove the old rope from the rear door baffle. Be careful not to chip or crack the refractory. Apply spray adhesive
(P/N 797-1813) to the groove in the baffle and attach a new length of 1-1/2" diameter fiberglass rope (P/N 853-
1036) to the groove. Be certain that the rope is properly positioned. Wash-coat the lower half of the rear door
refractory prior to closing.
8.21.3 — Closing and Sealing
Attach new tadpole gasket with fasteners 841-00507. Apply spray adhesive 797-1813 around the inner circumference
of the gasket and across the baffle seal area of the tube sheet. Apply blanket insulation 872-1073 to this area. Refer
to Figure 8-16.
Door bolts should be run in snug and tightened evenly to avoid cocking the door and damaging the gasket. Start
tighte
ning at top center and alternate between the top and bottom bolts until both are tight. Do not overtighten.
Tighten alternate bolts until the door is secured and gas tight. After the boiler is back in operation, retighten the bolts
to compensate for any expansion. Loosen the nut on the davit stud to release tension from the davit arm.
8.22 — Lubrication
8.22.1 — Electric Motors
Follow the motor manufacturer’s recommendations for lubrication and care of motor bearings. Siemens motors
used in Cleaver-Brooks applications require an aluminum complex high temperature grease. The grease used must not be
mixed with other lubricants.
The length of time a bearing can run without having grease added will depend upon many factors, including the rat-
ing of the motor, type of motor enclosure, duty, atmospheric conditions, humidity, and ambient temperatures.
!
Warning
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