Textron Bell 412, Maintenance Manual

Page: 228 / 288

BHT-412-MM-2
5-00-00
Page 180
Rev. 16 26 FEB 2013 Export Classification C, ECCN EAR99
e. Visually inspect upper flange surface and upper pilot
diameter and lower flange surface and lower pilot diameter of
ring gear 205-040-231 for fretting and wear. Visually inspect
upper and lower gear teeth contact patterns for evidence of
pitting, scoring, wear, or damage.
f. Visually inspect upper sun gear 412-040-230 teeth for
wear, damage, and contact pattern.
CAUTION
DO NOT USE SOLVENT TO CLEAN COUPLING
T E E T H . S O LV E N T M AY L E AV E A R E S I D U E,
W H I C H P R E V E N T S L U B R I C A N T S F R O M
ADHERING TO COUPLING.
g. Visually inspect gear tooth contact pattern on the four
pinion assemblies in lower planetary assembly. It is normal for
ring gear meshing side of planet pinions to have a double wear
pattern. Check bearings for smoothness and freedom from
binding by rotating the four pinion assemblies. Visually inspect
all lockwire provisions.
h. Visually inspect lower sun gear 205-040-229 teeth for
wear, damage, and contact pattern.
11. Check backlash in three places approximately 120
°
apart
between gear 412-040-701 and pinion 412-040-700 using
backlash tool 412-240-006. Record backlash on inspection log.
12. Visually inspect manifold assembly 204-040-393. Remove,
clean, and inspect jet No. 7 for evidence of clogging.
13. Remove quill assembly 412-040-362 from main case. Do
not disassemble. Visually inspect mating flanges and pilot
diameters for corrosion, fretting, and wear. Visually inspect all
lockwire provisions. Check duplex bearing for smoothness and
freedom of rotation by manually turning gear 412-040-701.
Visually check index marks on gear and inner race of bearing
set 205-040-245 for alignment.
SPECIAL INSPECTIONS
5-34. EACH 3000 HOURS OF TRANSMISSION (412-040-004) OPERATION (CONT)
DATA REFERENCE INSPECTION TASK DESCRIPTION
INITIAL
MECH OTHER