Thermo King SB-III 30 SR+, Manual

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Refrigeration Service Operations (Rev. 04/02)
65
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 following procedure to install a compressor coupling
on the compressor crankshaft.
1. Clean the compressor shaft and taper and coupling bore
and 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.
3. Using no lubricants, set the coupling on the crankshaft
and align the keyways using the Keyway Tool (P/N
204-972). Insert the tapered end of the tool into the
keyway and gently move the coupling on the shaft
while pressing the tool into the keyway. This will align
the keyway in the crankshaft with the keyway in the
coupler.
Keyway Tool P/N 204-972
CAUTION: If you are assembling a used
coupler or crankshaft and the tool does not fit
easily there is a problem with one of the keyways! Do
not remove the coupler and place the key in the crank-
shaft keyway and then drop the coupler on. If the tool
does not fit, the key will not fit, and it will hold the
taper in the coupler off the taper on the shaft. Check
both keyways for burrs or corrosion. A key can be
coated with fine lapping compound and used as a
lapping tool to clean the keyways.
AGA333
4. Remove the Keyway Tool and check the fit of the new
key (P/N 55-9024). It should fit into the keyway with a
light press fit requiring only a minimum of light tap-
ping. If the key does not fit properly, remove the cou-
pler and inspect the keyways and key for burrs or other
problems. Recheck the fit as shown above.
5. When the key fits properly, remove the coupling from
the crankshaft.
6. Small (1.0 in.) shaft only—apply a very thin even coat-
ing of blue Loctite™ 242 to the back one third of the
crankshaft taper.
7. Re-install the coupling and align the keyways with the
Keyway Tool.
8. Do not install the key at this time. Install the flat
washer and bolt and pre-torque to 20 ft-lb (27 N•m).
Remove the bolt and washer.
9. Install the key in the keyway. As above, it should fit
with a light press fit requiring only a minimum of light
tapping. Do not install the key into the keyway
beyond the front face of the coupler. If tapped in far-
ther it may cause the coupler to move off center on the
crankshaft.
10. Re-install the bolt and heavy flatwasher and snug the
bolt down by hand. Torque the bolt in the 1.0 in. shaft
to 54 ft-lb (73 N•m). Torque the bolt in the 1.187 in.
shaft to 90 ft-lb (122 N•m).
1. Coat area shown with Blue Loctite 242.
Small Shaft Only
AGA334
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