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8. Checking and Setting High Speed Shaft End Play
If a new high speed shaft assembly, lower gearbox housing, upper or lower high speed journal
bearings, or thrust washers are installed high speed shaft end play must be measured and reset.
NOTE: For accurate checking of shaft end play, all parts must be dry and free of oil.
Step 1 Install the lower journal bearing (151A) in to the lower gearbox housing (101A). Install the
hex head cap screws (905M) and the lock washers (154D). Tighten screws (905M) to
correct torque specification.
Step 2 Install the upper high speed shaft journal bearing (151B) into the bearing plate (102).
Install the hex head cap screws (905N) and tighten to the specified torque.
Step 3 Place both thrust washers (155A) and (155B) (if required) into lower high speed journal
bearing. Place the high speed shaft assembly (A130) into the lower gearbox housing
installing it through the lower high speed shaft journal bearing (151A).
Step 4 With the aid of two large diameter alignment bolts (909C), install the bearing plate (102)
without the o-rings (936T), (936TT) and (936YA). Clamp the bearing plate (102) and the
lower gearbox housing (101A) together with two “C” clamps or bolts.
Step 5 With the shaft in a vertical position, move the shaft up and down while measuring the
total end play with a dial indicator or depth micrometer. Shaft end play must be .015 +/-
.002 inch. If end play is not within this limit, calculate the shim thickness required to place
the shaft within the proper end play. Select the required thickness shim using (158)
series shim spacer sizes. Do not install shims below the lower bearing.
Step 6 Remove the alignment bolts (909C) and the “C” clamps from the bearing plate (102) and
lower gearbox housing (101A). Now remove the bearing plate (102).
Step 7 Remove the upper high speed journal bearing (151B) from the bearing plate (102).
Step 8 Place the required shim thickness over the upper high speed journal bearing (151B) and
reinstall the upper high speed journal bearing (151B) into the bearing plate (102). Tighten
hex head cap screws. Refer to table 8.1.
Step 9 Repeat steps 3 through 5, and verify high speed shaft (A130) end play. When end play is
within factory specification, repeat step 6.
Step 10 Remove the high speed shaft (A130) and the thrust washers (155A).
Step 11 Install thrust washer (155A) into lower high speed shaft journal bearing (151A) and install
a thrust washer (155B) into the upper high speed journal bearing (151B) with the flat side
(NO GROOVES) towards the high speed journal bearing (151A).
Step 12 Lubricate the upper and lower thrust washer (155A) with light turbine oil and install the
high speed shaft (A130) into and through the lower high speed journal bearing.
Step 13
Begin gearbox reassembly. Refer to the detailed Reassembly Procedure.
Step 14 Lubricate all assembled parts with light turbine oil as your mechanic proceeds with the
assembly.
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