SANY SRT95C Off-Highway Truck. Service Manual

shaft bevel gears (32) rotate about planetary
bevel gears (34) to provide the required
differential action.

Removal

1. Position the vehicle in a level work area,
raise the body and install the body prop pins.
Refer to Section 23 'BODY AND MOUNTING'.

warning

To prevent personal injury and property

damage, be sure wheel chocks, blocking

materials and lifting equipment are

properly secured and of adequate capacity

to do the job safely. A come-a-long or chain

fall with a minimum capacity of one ton is

required for removal and installation of a

main reducer and differential assembly.

2. Apply the parking brake and switch off
the engine. Turn the steering wheel in both
directions several times to relieve pressure in
the steering system. Block all road wheels.
3. Ensure the battery switch turned to the
'OFF' position.
4. With suitable containers in position, drain
the
lubricant from the banjo housing and wheel
planetary assemblies.

5. Remove the driving flange cover from each

wheel and pull the axle shaft and sun pinion
gear assembly of each driving wheel at least
150 mm (6 in) out of the wheel housing to
disengage the inner axle shaft splines from the
splines of axle shaft bevel gears (32).
6.Identify the relationship of yoke (4) flange
with that of the driveline companion flange
using punch marks. Remove rear driveline
connecting Main reducer an differential
assembly and transmission. Refer to Section
19. Rear driveline.
7. Remove set screw (18) from main reducer

Rear Axle Assembly And Installation

housing(16)  housing  and  replace  it  with  a
lifting eye.
8.Install chain fall or come-a-long to the loop
placed  on  the  body  just  behind  the  hoist
brackets. Attach the other end of the lifting
device to eye previously installed in the main
reducer housing.
9. Support the weight of the main reducer and
differential assembly with the lifting device.
10. Remove the self locking nuts which secure
the main reducer and differential assembly
to the axle banjo housing. These nuts can be
used for several times.
11. Turn the four screws(17) in to break the
seal between the main reducer housing(16)
and banjo housing. If this does not move the
main reducer and differential assembly out
enough, either remove the screws(17) and
insert longer bolts in the four holes, or use a
suitable bar to pry the differential assembly
away from the banjo housing and studs. If a
bar is used, caution should be exercised to
prevent damaging the mounting surfaces.
12.  Pull  the  main  reducer  and  differential
assembly away from the banjo until it clears
the  studs  of  the  axle  banjo  housing,  then
carefully lower the differential assembly.
13. Move main reducer and differential assem-
bly to a clean work area for disassembly.

Disassembly

Numbers in parentheses refer to Fig.1.

Driven spiral bevel gear component

Before the disassembly, make marks between
the joint surfaces of some assembly parts to
facilitate reinstallation:
Make identifying punch marks on both the
bearing caps (20) and main reducer housing
(16), so that the bearing caps can be returned
to their original position in assembly.
Scribe an identifying line on bearing adjusters
(24) and main reducer housing (16) bores
which these adjusters screw into. If the

Rear Axle Assembly And Installation

main  reducer  and  differential  assembly  is
disassembled for inspection purposes only,
this line will be of assistance when readjusting
the preload on the side bearing(25) cups and
cones. If the main reducer and differential
assembly is disassembled and parts replaced,
do not rely on this line for determining the
preload on the side bearings.
Scribe  an  identifying  line  on  the  right
differential housing (26) and left differential
housing (36) and the end of spider (33) to
show their relationship for assembly purposes.
1. Cut and remove lockwires (1), then remove
bolts (23) and locks (22).
2. Use a proper tool to clamp securely the
driven spiral bevel gear (27) to prevent the
driven spiral bevel gear (27) from rotating.
Then loosen the nut (28) on the bolt (29), but
do not remove them.
3. Cut and remove lockwires (1), loosen and
remove the bolt(21). Then remove bearing
caps (20) from main reducer housing (16).
Salvage dowel bushings (19) that are seated
in the bolt holes between the bearing caps and
the main reducer housing. The bushing can be
reused.
4. Unscrew and remove bearing adjusters (24).
5.  Lift  the  differential  assembly  from  main
reducer housing (16) and Position it on a clean
workbench or a spacial support.
6.Inspect whether the bearing(25) cups and
cones on both sides of differential assembly
are damaged, remove cones of bearing (25)
from differential assembly just only if they are
damaged and have to be replaced. Bearing
assembly  is replaceable as an assembly only.
If any component is defective, the complete
assembly must be replaced. When bearing
need not be replaced, wire the bearing(25)
cup and  parts which removed from the same
side (include busing and Bearing Cap, etc.)
for mating in assembly and marks should be
made to prevent the parts from being mixed
during reassembly.

Rear Axle Assembly And Installation

Note

:If the cone of bearing(25) should be

removed,  in  conjunction  with  the  bearing
puller, use a round steel disc, approximately
95 mm (3.75 in) diameter and 10 mm (0.38 in)
thick. This will serve as a centre for the puller
screw to push against. Puller arms must not
exert a force on the bearing roller separator
cage.
7.  Loosen  and  remove  the  bolts  (29)  and
nuts(28)  holding  the  driven  spiral  bevel
gear(27) and the right differential housing(26)
together. Position the differential assembly
vertically on a bench(could be lifted) with the
driven  spiral  bevel  gear's  tooth(27)  facing
downwards. Place thick wood bar under the
gear(27) and then separate  driven spiral bevel
gear(27) from right differential housing(26) by
tapping the edge of the gear(27) with a soft-
faced hammer or a copper stick.
8.  Loosen  bolts  (37)  right  differential
housing(26) and left differential housing(36)
together. Then lift right differential housing(26)
off left differential housing(36).
9. Remove one thrust washer (30) and axle
shaft  bevel  gear  (32),  then  lift  spider  (33)
and planetary bevel gears (34) out of right
differential housing(26).
10.Inspect  whether  it  is  necessary  to
replace  the  spider  (33),  bearing  (35)  and
four planetary bevel gears (34). Do further
disassembling only when the gear or bearing
has been excessively worn or damaged and
replacement is required.
11. Remove the axle shaft bevel gear (32) and
thrust washer (30) from the right differential
housing  (26).  Remove  the  dowel  pin  (31)
from  the  left  differential  housing  (36)  and
right differential housing (26) only when it is
necessary to replace the damaged parts in
them.

Drive spiral bevel gear component

1. Remove bolts (2) and plate (3). Pull yoke
(4) assembly from drive spiral bevel gear (13)

Rear Axle Assembly And Installation

shaft with care so as not to damage or distort

the yoke flange or sleeve surface.

2. Unscrew bolts (9) attaching bearing seat (8)
and shims (10) to the main reducer housing
(16).
3. Remove set screws (7) and screw in two
bolts(M16-80) in the tapped holes of bearing
seat (8) , using these bolts as pullers to
remove bearing seat (8) assembly.

Note:

If the above bearing seat assembly

removal procedure is not feasible, the
following method may be used: Invert main
reducer housing (16), as shown in Fig.4, then
use a copper bar to knock on the drive spiral
bevel gear(13) shaft to drive bearing seat (8)
out of the housing. During this operation, be
careful not to obliterate the etched dimension
on the bottom of drive spiral bevel gear(13)
shaft.
4. Remove shims (10) and wire them together
to aid in assembly.
5. Remove the oil seal (11) from bearing seat
assembly and discard it.
6.Inspect the cups and cones of bearing(12,14)
matched with the drive spiral bevel gear(13)
damaged or not. If yes, using a bearing puller
remove cone of bearing(12,14) from drive
spiral gear (13) shaft. Remove the cups of
bearing(12,14) and shim pack(15) from the
bearing seat(8) and main reducer housing(16)
just when the bearing(12,14) damaged and
need to be replaced.

Note:

If the bearing seat are still serviceable,

wire  the  cups  and  corresponding  cones
together for mating in assembly. Bearing  (12
, 14) is replaceable as an assembly only. If
any  component  is  defective,  the  complete
assembly must be replaced.

Inspection

Numbers in parentheses refer to Fig.1.
The importance of careful and thorough
inspection cannot be over stressed. Thorough

Fig.4 Driving Out bearing seat assembly

Rear Axle Assembly And Installation

inspection  and  necessary  replacement  of
parts now, may eliminate costly and avoidable
trouble later.
1. Clean all parts in a suitable solvent.
2. Immediately after cleaning, dry all parts,
except bearings, with compressed air, or lint-
free cloth. Bearings are better left to air dry,
then inspected and oiled thoroughly with gear
lubricant for protection from corrosion.
3.  With  the  parts  cleaned,  coat  parts
immediately with light oil to prevent corrosion.
If parts are not to be assembled immediately,
treat them with a good rust preventative and
wrap them with treated paper or other suitable
material designed to prevent corrosion.
4. Replace all gaskets, 'O' rings and seals with
new parts.
5.  Before  installing  the  main  reducer  and
differential assembly to the banjo, clean the
inside and outside of the banjo housing to
remove any foreign material.
6. Oil seal (11) rides on a special sleeve (5),
which  is  on  yoke  (4)  to  provide  a  smooth
contact surface. If the sleeve is rough or worn,
pull it from the yoke and install a new one.
Heat the new sleeve to 177 - 205o C (350 -
400° F) in oil to expand it for installation. If oil
heating equipment is not available, heat the
bushing evenly to 205o C (400o F). This takes
about 1 minute using a torch with a heating tip.
Use a Tempilstik or other temperature gauge
to make sure sleeve (5) is hot enough. Slide
heated sleeve on the yoke and tap lightly with
a hammer to seat it. When install the sleeve,
make sure the chamfer outwards, which is
specially used for oil seal's installation.
7.  Examine  bearing  cap  bushings  (19)  for
wear or damage. Replace as necessary.
8. Inspect all gears and splines for cracked
or broken teeth, excessive wear, and pitted
or  scored  surfaces.  Repair  or  replace  as
necessary.

Note:

If either driven spiral bevel gear (27)

or drive spiral bevel gear (13) is defective,

Rear Axle Assembly And Installation

both gears must be replaced, because they
are serviced only as a matched set. This set
is identified by a serial number on the OD
of  driven  spiral  bevel  gear  (27)  and  outer
face of  drive spiral bevel gear (13). It is also
advisable to replace axle shaft bevel gears
(32) or planetary bevel gears (34) in matched
sets only, because a newer gear installed to
operate in conjunction with an older, worn gear
tends to carry an uneven portion of the load.
This creates an excessive amount of stress on
the new gear.
Check  for  pitted,  scored  or  worn  thrust
surfaces of differential housing halves, spider
trunnions  and  thrust  washers.  It  is  also
advisable to replace thrust washers(30) in
sets, as the use of a combination of old and
new washers may cause premature failure.
9. Inspect main reducer housing (16), driven
spiral  bevel  gear  (27),  right  differential
housing(26)  and  bearing  seat(8)  for  bore
damage,  cracks  and  wear.  Replace  as
necessary.
10.  Check  the  amount  of  run-out  on  the
machined surfaces of bearing seat (8). The
outer machined surface matched with the main
reducer housing(16) on the hub of the bearing
cage must be concentric with the bearing cup
bore within 0.05 mm (0.002 in) total indicator
reading (T.I. R.).
11. The  outer  machined  surface  (OD)  on
bearing seat (8) must be concentric within
0.05 mm (0.002 in) T.I. R. with the surface into

which oil seal (11) fits.

12. The threads and bores of bearing caps
(20) and main reducer housing (16) must be
concentric within 0.27 mm (0.005 in) T.I. R.
and must be square with the drive spiral bevel
gear bore within 0.08 mm (0.003 in) when
checked at points 254 mm (10 in) from the
centre line of the drive spiral bevel gear bore.

Note

: Bearing caps (20) and main reducer

housing (16) can only be replaced as an
assembly.

Rear Axle Assembly And Installation

13. The machined mating surfaces of right
differential housing (26) and left differential
housing (36) must be square with the axis of
the housing within 0.075 mm (0.003 in) T.I. R..
The mating diameters of the cases must also
be concentric within 0.075 mm (0.003 in) T.I.
R..

Assembly

Numbers in parentheses refer to Fig.1.

warning

To prevent personal injury and property

damage, be sure lifting equipment is

properly secured and of adequate capacity

to do the job safely.

Drive spiral bevel gear component

Note

: During assembly and installation, make

sure that mated, punch-marked or otherwise
identified parts are returned to their original
positions, if still serviceable.
1. Determine the required shim pack (15)
thickness so as to give the proper gauging
distance within 0.075 mm (0.003 in) etched on
drive spiral bevel gear (13) tail shaft (see Fig.5
and Fig.6) as follows:

Note

: The OD of a bearing(14) cup can be

ground to 189.5- 190mm to provide a slip
fit special tool as an aid in determining the
required thickness of shims (15).
a. Install a shim pack (15) of approximately 1.5
mm(0.060 in), measure and record the actual
thickness as Dimension 'X', and the loosely

fitting bearing cup (14) (see previous note) in

the drive spiral bevel gear shaft bore of main
reducer housing (16).
b. Install bearing(12) cone and bearing(14)
cone on drive spiral bevel gear (13). Install
bearing(12) cup into bearing seat (8) until it
bottoms against the bearing seat shoulder.
Install drive spiral bevel gear assembly (12, 13

Fig.5 Measuring dimension A

Fig.6 Method for measuring the dimension A

千分尺

尺寸

Rear Axle Assembly And Installation

& 14) and bearing seat (8) into main reducer
housing (16). Secure bearing seat (8) with
eight bolts (9) equally spaced.
c. Rotate the drive spiral bevel gear (13) and
tighten bolts (9) until the gear(13) cannot be
rotated by hand to seat the bearing rollers

firmly.

d. Place a flat plate approximately 450 mm
long and 300mm wide across the two bearing
cap (20) mounting surfaces in main reducer
housing (16) as shown in Fig.5. The plate

must lie perfectly flat between the bearing cap

mounting surfaces and must be clean and free
of burrs.
e. Measure the distance from the end of drive
spiral bevel gear (13) shaft to the plate (axle
centre line). See Fig.6.
Record this distance as Dimension 'A'.
f. Record the dimension etched on the end of
drive spiral bevel gear (13) as Dimension 'B'.
g. The correct thickness of shims (15) to
be used is: Dimension 'X' + Dimension 'B' -
Dimension 'A'.
2. Determine shim pack (10) thickness so as
to allow the pair of bearing(12,14) on the drive
spiral bevel gear (13) 0.02 - 0.05mm (0.0007 -
0.002 in) axial end play as follows:
a. With drive spiral bevel gear (13) installed as
previously described in Steps 1-a through 1-f,
rotate drive spiral bevel gear (13) and tighten

the eight bolts (9) evenly spaced, to 110 N•m
(80 lbf•ft) torque to seat the bearing rollers
firmly.

b. Remove bolts (9) and reinstall two of them
180° apart. Tighten the two bolts alternately in

30 N•m (20 lbf•ft) increments to a final torque
of 275 N•m(200 lbf•ft).

c. Measure the gap between bearing seat (8)
and main reducer housing (16) adjacent to
the two installed bolts and record the average
measurement as Dimension 'C'.
d. The correct thickness of shim pack (10) is:
Dimension 'C'(Step 2-c) +Dimension 'B' (Step
1f) - Dimension 'A' (Step 1-c)-0.04mm. This

Rear Axle Assembly And Installation

shim pack thickness should provide 0.02mm-
0.05 mm (0.007-0.002 in) axial end play of
bearing(12,14)on the drive spiral bevel gear
(13).
3. Remove bolts (9) and remove bearing seat
(8) from main reducer housing (16). Adjust
shim  pack  (15)  to  the  required  thickness
as  calculated  in  Step  1-g  and  replace  the
ground bearing(14) cup with bearing cup to be
installed permanently.
4.  Install  drive  spiral  bevel  gear  assembly
(12, 13 & 14) in main reducer housing (16) as
previously described in Steps1 and 2.

Note:

Due to reasons such as measurement

error, incompletely compacted  shims during
the  measurement,  the  thickness  of  shim
pack(15) and shim pack (10) measured and
determined  in  the  above-mentioned  steps
cannot  be  used  as  the  final  assembling
thickness. It just provides a good starting point
or reference to determine the final thickness.
The  final  determining  for  the  thickness  of
shim pack(15) is that make sure the value
deviation is less than 0.075 mm (0.003 in) (see
Fig.7), which between the actual adjustment
distance measured as the bearing(14) pressed
tightly with the clearance disappears and the
dimension etched on the end of drive spiral
bevel gear (13) .
The  final  judgment  for  determining  the
thickness of shims (10) is that position a dial
indicator on the surface of bearing seat(8). the
dial indicator should vertically to the bolt (2)
head. With the bearing seat as the pivot, use a
crowbar to act on the plate. The runout should
be in range of 0.02 - 0.05 mm.
5. Install oil seal (11) into bearing seat (8)

flush with the bearing seat shoulder at the seal

bore.
6. Install measured shim pack (10) as
calculated in Step 2-d on bearing seat (8)
and install the assembly on main reducer
housing (16). Align slot in bearing seat (8) with
the lubrication holes in shims (10) and main

Fig.7 Allowable offset distance for initial
adjustment of drive bevel gear

A = Etched mounting distance ± 0.75

Rear Axle Assembly And Installation

reducer housing(16) and install bearing seat
assembly in main reducer housing.
7. Install bolts (9) connecting bearing seat
(8) to main reducer housing (16) and tighten

to a torque of 270 N•m(198 lbf•ft). Install set

screws (7) in bearing seat (8).
8. Lubricate the lip of sleeve (5) and spline
of drive spiral bevel gear (13) with grease
Lubricant.
9. Install yoke (4) assembly to operator spiral
bevel gear (13) spline until it contacts bearing
cone (12).

Note:

DO not pound on yoke flange.

10. Install plate (3) and secure to drive spiral
bevel gear (13) with bolts (2). Tighten bolts (2)

to a torque of 270 N•m (198 lbf•ft) and secure

with lockwire (1).

Driven spiral bevel gear assembly

1. Press thrust washer dowel pins (31) into
holes in left differential housing(36) and left
differential housing(38), if removed.
2. Install bolts (29) and nuts (28) and tighten

to a torque of 900 N•m (663 lbf•ft).

Spider and component parts assembly

1. If the dowel pin (31) of half shaft bevel
gear gasket (30) is removed, press it into the
locating holes of left differential housing (36)
and right differential housing (26).
2. Lubricate inner walls of left differential
housing (36) and right differential housing (26)
and all component parts with gear lubricant.
3. Position one thrust washer (30), grooved
side facing towards axle shaft bevel gear in
bore of right differential housing (26).
4. Install the first axle shaft bevel gear (32)
machined surface against thrust washer (30)
in right differential housing (26).
5. Install bearings (35) in planetary bevel gears
(34) and install bearings and planetary bevel
gears assembly on spider(35), if removed.
Control the dimensions A and B as shown in
Fig.8.

Fig.8 Installation of spider, bearing and
planetary gear

Dimension

A=114.325

+0.10

Dimension

B=228.65

+0.20

Rear Axle Assembly And Installation

6. Lay complete spider assembly in planetary
bevel gear grooves in face of right differential
housing (26).
7. Install other axle shaft bevel gear (32)
and thrust washer (30), with grooved side of
washer mating with machined surface of axle
shaft bevel gear, in left differential housing (36).
8. Assemble left differential housing (36) to
the driven spiral bevel gear (27) and right
differential housing (26) assembly, making
certain that thrust washers (30) do not slip off
dowel pins (31). Turn left differential housing
(36) until the mating mark made during
disassembly lines up with the mark made on
right differential housing (26).
9. Apply retaining compound to bolts (37) and
install four bolts (37) equally spaced. Tighten

bolts (37) to a torque of 580 N•m (428 lbf•ft).

10. Check assembly for free gear rotation and
correct if necessary. Install remaining bolts (37)

and tighten to a torque of 580 N•m (428 lbf•ft).

11. Press side bearing (25) cones squarely
and firmly over machined cylinders of left
differential housing (36) and right differential
housing (38).

Driven spiral bevel gear component

assembly to main reducer housing

Bearing adjusters(24) have two basic
functions:
Pre-loading cups and cones of bearing(25);
and positioning driven spiral bevel gear(27) to
obtain the correct backlash between the driven
spiral bevel gear(27) and drive spiral bevel
gear(13). The bearing adjuster (24) located on
the same side of drive spiral bevel gear (13)
as driven spiral bevel gear(27), pushes the
driven spiral bevel gear toward the drive spiral
bevel gear. Bearing adjuster (24), located on
the opposite side of drive spiral bevel gear
(13) than the driven spiral bevel gear, pushes
the driven spiral bevel gear away from the
drive spiral bevel gear. The driven spiral bevel
gear assembly must be installed onto main

Rear Axle Assembly And Installation

reducer housing(16) so that cups and cones
of bearing(25)are properly pre-loaded; correct
backlash exists between driven spiral bevel
gear (27) and drive spiral bevel gear (13),
and satisfactory tooth pattern is established
between driven spiral bevel gear (27) and
drive spiral bevel gear (13).
These conditions can be obtained by using the
following procedures:
1. Mount driven spiral bevel gear (27) and
differential assembly on main reducer housing
(16). Make sure that side bearing(25) cups
are properly positioned on side bearing(25)
cones. Install bearing caps (20) over cups and
cones of bearing(25), then secure bearing
caps to the main reducer housing with four
dowel bushings (19) and bolts (21). Secure
bolts snugly, but do not tighten them to torque

specifications at this time.

Note

: Each bearing cap (20) is mated to

main reducer housing (16), therefore, they
must be returned to their original positions by
aligning the identification marks made during
disassembly.
2. Install a dial indicator to check the back
side of driven spiral bevel gear (27) for true
running. Rotate the assembly with an easy
motion and note the back face run-out. The
run-out is not to exceed ±0.075 mm (0.003
in) with the dial indicator position as shown in
Fig.9.
3. Using a micrometer, take a measurement
diagonally across bearing cap (20) lock pads
and record it for reference later.
4. Install bearing adjusters (24) in their
respective bearing caps (20).
5. Place a dial indicator in the position shown
in Fig.10, to check driven spiral bevel gear
backlash. The dial indicator pointer must be
perpendicular to the tooth surface. Tighten
bearing adjuster (24) on the driven spiral bevel
gear side until the backlash between driven
spiral bevel gear (27) and drive spiral bevel
gear (13) reads 0.41mm-0.56mm (0.016-0.022

Fig.9 Checking Driven spiral bevel Gear
Runout

Fig.10 Checking Driven Spiral Bevel Gear
Backlash

The gauge pointer must be perpendicular to the tooth

face, and the clearance value is 0.41~0.56mm.

Rear Axle Assembly And Installation

in) on the dial indicator.
6. Tighten the opposite bearing adjuster (24)
until another measurement across bearing
cap (22) lock pads indicates a 0.05 - 0.13 mm
(0.002 - 0.005 in) expansion when compared
to the measurement recorded in Step 3. At
the same time, rotate the driven spiral bevel

gear(27) until the rotate torque is 9.5N•m-
19N•m. Then the corresponding preload of the

pair of bearing(25) is correct. This preload can
be measured  with a spring scale by pulling
the bolt(29) in the tangential direction making
the driven spiral bevel gear just rotating as the
force is 53N-104N.
7. Recheck the backlash tolerance between
driven spiral bevel gear (27) and  drive spiral
bevel gear (13) which should be 0.41 - 0.56
mm(0.016-0.022  in).  If  this  tolerance  has
not  been  obtained  at  this  point,  it  can  be
accomplished without changing the bearing
preload by backing off one adjuster a certain
number  of  notches  and  tightening  up  the
opposite adjuster an equal number of notches.
8. When a satisfactory backlash tolerance has
been established, check the gear tooth pattern
as described under the heading  'Adjustments'.
9. If gear tooth pattern is not correct, some
correction  can  be  made  by  systematically
loosening and tightening the bearing adjusters
(24), as previously described, but in every
instance  re-check  the  backlash  tolerance.
If a favourable gear tooth pattern cannot be
established  within  the  backlash  tolerance,
it will be necessary to alter, add or remove,
shims(15) between bearing(14) cup and main
reducer housing(16) and alter shims (10) by
the same amount.
10. When altering these shims as described
in ' drive Spiral Bevel Gear Group ', disregard
all  procedures  given  for  comparing  the
micrometer (measured) dimension and etched
dimension on drive Spiral Bevel Gear (13) tail
shaft end.
11. The procedures for keeping differential

Rear Axle Assembly And Installation

side bearing preload, backlash and favourable
gear tooth pattern within specifications is
strictly a ' try, check, and try again ' method.
12. After a satisfactory preload, backlash and
gear tooth pattern is obtained, make certain
that the bolts (9) are tightened to a torque of

270N•m (198 lbf•ft). Again check backlash

tolerance and gear tooth pattern.
13. Tighten bearing cap bolts (21) to a torque

of 900 N•m (663 lbf•ft) and tie with lockwire

(1).  The  lockwire  passes  over  the  top  of
bearing cap (20) and through the heads of the
respective bolts. The same procedure is to be
followed for both bearing caps.
14. A  final  measurement  across  bearing
cap (20) pilot pads must indicate a 0.05 mm
(0.002 in) to 0.13 mm(0.005 in) expansion,
after ten driven spiral bevel gear revolutions
under  a  light  load,  when  compared  to  the
original measurement recorded in Step 3. This
ensures that the side bearings have the proper
preload.
15. Install adjuster locks (22) and secure with
bolts (23). Tighten bolts (23) to a torque of 74

N•m (54 lbf•ft) and tie with lockwire (1).

Adjustment

When  adjusting  a  noisy  main  reducer  and
differential assembly that has been in service
for  some  time,  more  harm  than  good  can
result. Changes in adjustment will frequently
concentrate  the  bearing  area  on  a  small
portion  of  the  teeth  which  often  results  in
failure. Therefore,  it  is  advisable  to  know
exactly  what  the  end  result  will  be  before
adjustments are made in an old differential.

Note:

A rebuilt main reducer and differential

assembly or one that has not worn excessively
may be adjusted as previously described.
The following suggestions are offered to make
gear tooth pattern analysis and identification
easier.
1. Paint twelve teeth of driven spiral bevel
gear with Prussian Blue, oiled red lead, or

Rear Axle Assembly And Installation

some other easily removed paint or dye. When
the drive spiral bevel gear is rotated, the paint
is squeezed away by the contact of the teeth,
leaving bare areas the exact size, shape and
location of the contacts.
2. Make this check by rotating the driven
spiral bevel gear at least ten revolutions under
light drive load. Another method for checking
contact pattern is to turn the driven spiral bevel
gear clockwise and anticlockwise several
times. For sharper impressions apply a drag
on the driven spiral bevel gear by forcing a
wooden block against the edge of the driven
spiral bevel gear gear while it is being turned.
3. Gear tooth patterns can be interpreted by
referring to Figs. 11- 16.
a. If a contact pattern similar to that shown in
Fig.11 is obtained, the adjustment is correct.

b. If the contact area is on the inner side of the
driven spiral bevel gear(27) teeth, see Fig.12,
move driven spiral bevel(27) away from
drive spiral bevel gear(13) by turning bearing
adjusters equal amounts until the proper
bearing pattern is obtained.

Fig.11 Proper Tooth Contact

Fig.12 Insufficient Backlash

Rear Axle Assembly And Installation

SANY SRT95C Off-Highway Truck. Service Manual - page 9