16
field repair
Figure 14
Model 3400 Final Assembly
4
6
5
4
3
3
3
2
1
8
8
9
the prescribed preload of .001" to .003" (.025–.076mm)
remove an amount of shims from between the case and
labyrinth ring equal to the measured end play plus .001"
to .003". For example if the measured end play is .005"
(.127mm), remove a total of .006 to .008" (.152–.203mm)
in shim thickness.
f–Tighten labyrinth ring cap screws to 35 ft·lbƒ (48 N·m)
torque.
g–Fill grooves of labyrinth ring and water slinger with lithium-
base grease of NLGI No. 2 consistency.
h–Install water slinger and its O-ring (703) on fan shaft.
9. Install inspection cover, gasket (602), and pipe plugs.
Final Assembly–34.4 Series
Part numbers and references—refer to
Figures 4 and 15.
1. Install O-ring (702) onto pinion cage subassembly.
2. Bolt pinion cage subassembly to case using proper number
of shims to give indicated pinion setting distance which is
etched on front face of pinion gear. See Figure 10. Tighten
to 75 ft·lbƒ (102 N·m) torque.
3. Temporarily install lower fan shaft cap and secure to case
with cap screws. Leave a minimum of 1⁄8" (3mm) clearance
between cap and case. Do not install O-rings or shims at
this time.
4. Lower fan shaft and interstage shaft subassemblies into case
simultaneously. Engage marked spiral bevel ring gear teeth
with marked spiral bevel pinion tooth. The gear and pinion
are match-marked when lapped and must be assembled the
same way. The ring gear has the end of two teeth marked
“X” and the pinion has one tooth so marked— the gears
should be engaged with the X-marked pinion tooth between
those marked on the ring gear. Match mark location can be
checked through the inspection opening.
