JOHNSON CONTROLS
82
FORM 102.20-OM2
ISSUE DATE: 6/01/2015
SECTION 4 - SERVICE AND REPAIR
•
For fan or motor RPM, use a tachometer, strobo-
scope or revolution counter.
•
The voltage and amperes can be obtained by using
the appropriate multimeter test device.
• A sketch of the duct configuration would assist us
in trying to resolve the problem.
•
The most important item is to provide a detailed
explanation of the problem.
• An orifice is the best method of measuring flow in
piping and in the air system.
ADJUSTING, REMOVING, AND INSTALLING
SHEAVES
Fixed Pitch Sheaves (T.B Woods With Sure
Grip Bushings)
Tools and Materials Required
•
Standard mechanic’s hand tools
• Medium flat file
•
Torque wrenches (0 to 250 in-lb)
•
Hex (Allen) socket set for torque wrench
•
Standard 3/8 in. or 1/2 in. socket set
•
Hammer
•
Fine Emery cloth
•
Contact cleaner or mineral spirits
Removing Sheave
1. Remove the belts.
2. Remove the cap screws from bushing/sheave as
shown in
.
FLANGE
FLANGE
SLIT
TAPER
SET SCREW
(not shown)
KEYWAY
GROOVE
WEB LOCKWASHERS
CAPS SCREWS
TAPERED
BORE
SHEAVE
BUSHING
LD09664
FIGURE 88 -
INSERTING CAP SCREWS
3. Separate the sheave from the bushing.
4.
Standard Mounted
- Thread the cap screws into
the threaded holes in the sheave. Hand tighten it-
against bushing flange.
5.
Reverse Mounted
- Thread the cap screws into
the threaded holes in bushing. Hand tighten it
against the sheave web.
6. Tighten each cap screw gradually and evenly in
rotation to push the sheave off the taper of the
bushing. Tap lightly with a hammer, if necessary.
7.
Remove or loosen the set screw from the flange of
the bushing. Inspect it, and if necessary, replace it.
8. Pull the bushing off of the shaft. If the bushing
will not come off, insert a screwdriver into the slit
in the bushing.
9. Remove the key from the keyway.
Installing Sheave
Do not use lubricants in this installation.
Bushing and sheave mating surfaces must
be clean and oil free.
1. Inspect the tapered bore of the sheave and the ta-
pered surface of the bushing. Remove any paint,
dirt, oil or grease.
2. Select the type of mounting that best suits this ap-
plication as shown in
and
LD05630
FIGURE 89 -
STANDARD MOUNTING
