Thermo King SB-190 30, Manual

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Structural Maintenance (Rev. 12/03)
88
7. After correct end-play is obtained, add oil for the bear-
ings.
8. Lock the assembly in a vise with the vent facing up.
Pour the oil (P/N 203-278) through the top plug until it
runs out of the side hole. The assembly holds 2.2 oz
(65 ml). Check the condition of the O-ring used on the
plugs and replace if necessary. Install the top and side
plugs. Clean up any spillage.
9. Place the assembly on the workbench with the vent up.
Rotate the shaft by hand. The shaft should be free
enough to rotate without having to hold the housing.
CAUTION: When installing the fan shaft
assembly, make sure that the vent is mounted
facing up.
IDLER ASSEMBLY
The unit is equipped with a one-piece idler assembly that
contains tapered roller bearings in a sealed oil reservoir.
This assembly does not require any maintenance. There is a
level plug and a fill plug, but they are not normally used
except after removal and repair of the idler assembly. The
roadside end oil seal and the curbside end oil seal should be
checked during the pre-trip inspection for oil leakage. If
there is any sign of leakage, the idler assembly should be
removed and repaired.
Idler Assembly Overhaul
Disassembly
1. Remove the idler assembly from the unit. Remove both
oil plugs and drain the oil from the housing.
2. After draining the oil from the housing, remove the
four retaining bolts from the curbside end of the assem-
bly.
3. To remove the shaft from the assembly, tap the opposite
end of the shaft with a soft hammer. After the shaft has
been removed, clean all the parts in clean solvent.
4. Using a punch, remove the oil seal from the curbside
end of the assembly. With the seal removed, clean the
housing in solvent.
5. Check the condition of the vent. If it is loose or dam-
aged, it must be repaired or replaced.
6. After all the parts are cleaned, inspect the bearings and
bearing races for wear or damage.
7. To replace the bearings, first drive bearing off shaft
with a punch at notch in the base of the shaft.
Reassembly
1. Install the new bearings on the shaft with a pipe. Place
the pipe over the shaft and drive bearing down. Turn
the shaft upside down, and use the pipe to drive the
other bearing down.
2. Install a new oil seal on the curbside end of the assem-
bly after replacing the bearing race and splash guard.
3. Replace the shaft in the housing. Install a new seal in
the retainer cap. Use the original shims and replace the
O-ring if needed.
4. Install the retainer cap assembly over the shaft, then
install the bolts.
5. Torque the bolts in a criss-cross pattern in equal steps to
80 in-lb (9.04 N•m).
6. Lock the assembly in a vise and set up a dial indicator
to read end-play. To measure the end-play, rotate the
shaft while pushing in one direction, and set the dial
indicator to ‘0’. Now rotate the shaft and pull in the
opposite direction while reading the dial indicator. End-
play should be 0.001 to 0.005 in. (0.025 to 0.127 mm).
If end-play is incorrect, use different shims to obtain
correct end-play.