Chapter 7 Reduction and Reversing Gear
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3,4]H3(B)(CJE
3. Inspection and Servicing
3-1
Clutch case
(1}
Check the clutch case with a test hammer for cracking.
Perform a color check when required.
If
the case is cracked, replace
it.
(2) Check for staining on the inside surface of the bearing
section.
Also, measure the inside diameter of the case.
Replace the case
if it
is worn beyond the wear limit.
3-2 Bearing
(1)
Rusting and damage.
lf the bearing is rusted or the taper roller retainer is
damages, replace the bearing.
(2) Make sure that the bearings rotates smoothly.
If
rotation
is
not smooth,
if
there
is
any binding, or
if
any abnormal sound is evident, replace the baring.
3-3
Gear
Check the surface, tooth face conditions and backlash of
each gear. Replace any defective part.
(1} Tooth surface wear.
Check
the
tooth
surface
for
pitting,
abnormal
wear,dents,and cracks. Repair the lightly damaged
gears and replace heavily damaged gears.
(2)
Tooth surface contact.
Check the tooth surface contact. The amount of tooth
surface contact between the tooth crest and tooth flank
must be at least 70% of the tooth width.
(3) Backlash.
Measure the backlash of each gear, and replace the
gear when it is worn beyond the wear limit.
Maintenance
standard
Input shaft forward gear
and
output shaft
forward
0.05~0.14
gear
Input shaft reverse gear
0.06~0.12
and
intermediate gear
Intermediate gear
and
0.06~0.12
output shaft reverse gear
3-4 Forward and reverse large gears
(1)
Contact surface with drive cone.
mm(in)
Wear
limit
0.2
0.2
0.2
Visually inspect the tapered surface
of
the forward and
reverse large gears where they make contact with the
7-12
drive cone to check if any
abnormal condition
or
sign
of overheating exists.
If
any defect is found,
replace the gear.
(2)
Forward/reverse gear needle bearing.
Tapered
surlace
When an abnormal sound is produced at the needle
bearing, visually inspect the rollers; replace the bear-
inq if the rollers are faulty.
0
i2
'Rollers
3-5 Drive cone
(1) Visually inspect that part of the surface that comes
into contact with the circumferential triangular slot
to check for signs of scoring, overheating or wear.
If
deep
scoring
or
signs
of
overheating
are
found,
replace the cone.
contact surface
Helical involute spline
(2)
Check
the helical involute spline for
any
abnormal
condition on the tooth surface, and repair or replace
the part should any defect be found.
(3}
Measure the amount of wear on the tapered contact
surface
of
the drive cone, and replace the cone when
the wear exceeds the specified limit.
Prjnted in Japan
HINSHI-H8009
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