IMI-CPP - page 7

BULLETIN IMI-CPP
JUNE 2011
PAGE7
Actuator
The lifeof thepiston 'O' ring is such that, under normal operating conditions,
replacement will seldom benecessary. If disassembly isnecessary, follow the
lubricationprocedure inSection
F. REASSEMBLY,Wheel Reassembly
.
BladeThrust Bearings
Bladeassembliesare completewith blade thrust bearings located between the
blade crankarmsand blade skirts. Agrease fitting isprovided, in thewheel hubs,
for each bearing. Thesebearingsare packedwith
DARMEX 123
lubricant during
manufacturewith additional
DARMEX 123
lubricant added during assembly at
theChicagoBlower Corporation factory, until each bearing isone-hundred
percent full.
NOTE:
Basedon resultsof extensive tests, DARMEX 123 andSENTINEL123
are theonlyChicagoBlower Corporation approved lubricants for
thesebearings in this application.
Blade thrust bearings should be re-lubricated every two years as follows:
1. Run unit for five to tenminutes.
2. Stop unit. Lock out switch and removewheel nose spinning.
3. Add
DARMEX 123
or
SENTINEL 123
grease to each bladebearing through
the fittingsprovided until aone-thirty-second inchwide ring of greaseappears
around thebearing outsidediameter inside thewheel hub.
4. Replacewheel nose spinning.
Motor Bearings
1. Stop unit. Lock out switch.
2. Locate thegrease inlet fittings. Clean thearea thoroughly and remove theprotective
plastic caps from thegrease fittings.
3. Refer to themotormanufacturer's instructions. Add the recommended typeand
volumeof lubricant using a hand operated greasegun. If possible, rotate the fan by
hand during lubrication.
E. DISASSEMBLY
WARNING:
Disconnect all power sources from fan to avoidelectrical shock
andpersonal injury from rotatingparts.
Wheel Removal
NOTE: Theactuator andwheel arebalanced as aunit. Tomaintainproper
parts relationships andbalance; note anduse the factory imprinted
matchmarks, or otherwisematchmark theparts, beforedisassembly
and keepall hardware in itsoriginal location.
1. Disconnect thepilot positioner feedback cable clamp at thepilot positioner.
2. Disconnect theair lineat the rotating union and theair lineunion located at the
pilot positioner end of the cablepulley supportmember.
3. Remove the cablepulley supportmember.
4. Remove thewheel nose spinning.
5. Disassembleand remove theactuator:
A. Remove thepiston housing end plate (eight hex socket cap screwsand
lockwashers). Check the condition of theend plate 'O' ring. Replace if
necessary.
B. Remove thepiston assembly (onehex socket cap screw, flat washer,
and 'O' ring in the center).
CAUTION: Thepiston isunder springpressure.
1,2,3,4,5,6 8,9,10,11
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