Thermo King SB-210, Manual

Page: 110 / 159

Refrigeration Service Operations
110
4. Use the appropriate Allen tool to loosen the
coupling mounting screw.
5. Once the center screw has been loosened,
back the head against the tool and it should
push the coupling off the crankshaft as you
continuing turning the center screw in a
counter-clockwise direction. Using this tool
will prevent the coupling from popping off
because the center bolt and flatwasher will
hold it in place.
Compressor Coupling Installation
(Model 30)
In a tapered fit joint the entire twisting load
should be handled by the friction fit between the
two tapered parts. The key is only a backup and is
used to index the parts correctly. When a taper fit
is machined and assembled properly a key is not
needed. In fact, if the key is not installed correctly
it may be worse than no key at all! If the key does
not fit easily into the keyway, it will push the
tapered components apart and the reduced friction
could lead to slippage and premature failure.
The following procedure requires the key to be
fitted after the tapers are pulled together with
20 ft-lb (27 N•m) torque. This insures that the key
cannot hold the tapers apart when the final bolt
torque is applied.
Use the following procedure to install a
compressor coupling on the compressor
crankshaft.
1. Clean the compressor shaft taper and coupling
bore taper with a solvent that leaves no oily
residue (such as naphtha, lacquer thinner,
brake cleaner or the like).
2. Inspect both mating surfaces for burrs,
oxidation and other surface imperfections.
Dress with crocus cloth if necessary and
re-clean as required.
AGA1059
1
3
4
8
5
6
7
2
1. Coupling 5. 10 mm Allen Tool (for large shaft compressor)
2. Long Spacers (supplied with tool) 6. 5/16 Allen Tool (for small shaft compressors)
3. Short Spacers (supplied with tool) 7. Coupling Removal Tool (P/N 204-991)
4. Socket Head Bolts (supplied with tool) 8. Engine Mounting Flange
Figure 95: Compressor Coupling Removal Tool