6–11. CENTER SUPP CENTER SUPPORT A ORT ASSEMBL SSEMBLY Y
a.
a. DiDisasassssememblblyy (Foldout 8,B)
1. Place center support assembly 13 upright on the work table.
2. For later models, remove oil filter 24 and seal-ring 23 from center support 16.
3. Remove third clutch piston 9 and second clutch piston 19, with attached parts.
4. Remove inner sealrings 10 and 18 and outer sealrings 11 and 17 from pistons 9 and 19.
5. If parts replacement is necessary, disassemble the two piston assemblies. Cut the push-on nuts to prevent damaging the piston projections (Figure 6–49). Remove four push-on nuts 6 or 22, spring retainer ring 7 or 21, and twenty springs 8 or 20 from each piston.
6. Remove two sealrings 12 from the hub of cen-ter support assembly 13.
7. If bushing 14 in center support 16 is worn or damaged, collapse the bushing inward at the bushing splitline and remove.
8. Remove check ball 15 (freed by removing the bushing) from the hub of the support.
H00159.01
BEARING RACE BEARING RACE FOURTH CLUTCH FOURTH CLUTCH HOUSING ASSEMBLY HOUSING ASSEMBLY
Figu
Figure 6–49.re 6–49. RemoRemoving Puving Push-On Nush-On Nutsts and Spring Retainer and Spring Retainer
9. Determine the serviceability of the sealring grooves on the center support hub. Insert (do not force) gauge J 29198-2 into the groove on the center support hub. Rotate the gauge 360 degrees around the hub. If the gauge does not rotate freely, the support is damaged and should be repaired or replaced.
b.
b. ReworRework Cent(Foldout 8,B)k Center Super Support port Anchor Anchor Bolt HoBolt Holele
1. Starting with S/N 2410260655, a longer (3 ⁄ 8-16 x 3 inch) patch lock anchor bolt 54 (Foldout 10,A) and a chamfered washer 55 are used.
2. Using a drill press, locate the center support against a square, flat surface.
3. Turn a3 ⁄ 8-16 tap into the existing hole by hand.
Use a level and the shank of the tap to ensure that the center support is square and level.
4. Refer to Figure 6–50 for machining instruc-tions.
5. Remove any burr from the top of the bore be-fore checking depth reading (Figure 6–50).
Clean all chips out of the center support.
CAUTION:
CAUTION:
Do not attempt this
Do not attempt this rework procedure unless ad-rework procedure unless ad-equate machining facilities are available.
equate machining facilities are available.
H00160.01
SPRING RETAINER SPRING RETAINER
EJECTOR EJECTOR BOSS BOSS
PUSH-ON NUT PUSH-ON NUT SPRING (20)
SPRING (20) CLUTCH PISTON CLUTCH PISTON
RE
REBU BUIL ILD D OF OF SU SUBA BASS SSEM EMBL BLIE IES S
Figu
Figure 6–50. re 6–50. RewRework of Ceork of Center Sunter Supportpport Anchor Bolt Hole
Anchor Bolt Hole
Figure 6–51.
Figure 6–51. Rework Rework of Center of Center Support fSupport for One or One PiecePiece Thrust Bearing Race
Thrust Bearing Race AssemblyAssembly 1.380" MIN
1.380" MIN (35.0 mm) (35.0 mm)
TAP
TAP DRILL DRILL 1.610 in. 1.610 in. (40.89 mm) MAX (40.89 mm) MAX DEEPDEEP COUNTERDRILL
COUNTERDRILL 0.469 in. DIA (11.91 mm) 0.469 in. DIA (11.91 mm) xx 0.66
0.66 – –0.70 in. (16.760.70 in. (16.76 – –17.78 mm) DEEP 0.37617.78 mm) DEEP 0.376 – –1616 UNC 2B MIN FULL THREAD DEPTH TO DIMENSION UNC 2B MIN FULL THREAD DEPTH TO DIMENSION SHOWN
SHOWN V03296
0.156 in. (3.96 mm) DIA 0.156 in. (3.96 mm) DIA LUBE HOLE LUBE HOLE CENTER SUPPORT
CENTER SUPPORT 0.090 in.
0.090 in.
(2.29 mm) (2.29 mm)
30 30°
0.250 in.
0.250 in.
(6.35 mm) (6.35 mm) NOM.
NOM.
V03297 NOTE:Do not cut groove around the entire circumference of the hub, cut only the area the length of the hole diameter.
0.090 in.
0.090 in.
(2.29 mm) (2.29 mm)
c.
c. RewRework of Cork of Cententer Suer Supporpport for Ot for One Pine Pieceece Thrust Bearing Race Assembly
Thrust Bearing Race Assembly (Foldout 8,B) 1. Later models incorporate a one piece thrust
bearing race assembly 15 (Foldout 8,A). Cen-ter supports prior to S/N 2410226363 require a rework to ensure correct fluid flow and proper positioning of the bearing.
2. Secure the center support with the 0.156 inch (3.96 mm) diameter lube hole on the sealring side facing up (Figure 6–51).
3. Using a number 15 (1 ⁄ 4 x 1 inch) or number 91 (1 ⁄ 4 x3 ⁄ 4 inch) woodruff key cutter wheel or equivalent, undercut the area to the front of the lube hole 0.090 inch (2.29 mm) deep and 0.250 inch (6.35 mm) wide (Figure 6–51). Do not cut a groove around the entire circumference of the hub. Cut only the area the length of the hole di-ameter. Clean all chips out of the center sup-port.
4. With the black oxide race facing upward, make sure there is clearance around the widest lip of the race for fluid flow to bearing 15 and the third clutch.
d.
d. RewoRework of Nrk of Non-Ecceon-Eccentric ntric Center Center Support Support toto Eccentric Support
Eccentric Support (Foldout 8,B)
NOTE:
NOTE:
Transmissions S/N 2410260655 and later have an Transmissions S/N 2410260655 and later have an eccentric center support in which the bushing bore eccentric center support in which the bushing bore is slightly offset from center. This provides is slightly offset from center. This provides im-proved shaft alignment at normal transmission proved shaft alignment at normal transmission op-erating temperature. The center support in erating temperature. The center support in transmissions prior to S/N 2410260655 may be transmissions prior to S/N 2410260655 may be re-worked to provide the offset by machining the worked to provide the offset by machining the cen-ter support OD and installing shim 29 under the ter support OD and installing shim 29 under the support.
support.
CAUTION:
CAUTION:
•• This rework applies for non-eccentric centerThis rework applies for non-eccentric center support assemblies only. Do not rework an support assemblies only. Do not rework an ec-centric center support assembly.
centric center support assembly.
•• Do not attempt this rework unless adequate ma-Do not attempt this rework unless adequate ma-chining facilities are available.
chining facilities are available.
M
MT T((B B) ) 6 64 40 0, , 6 64 43 3, , 6 65 50 0, , 65 65 3 3 AU AUTO TO M MAT ATIIC C T TR RA AN NS SM MIIS SS SIIO ON NS S
1. Determine if the center support assembly is ec-centric or non-ecec-centric (Figure 6–52).
2. Rework the center support anchor bolt hole if it has not previously been reworked. Refer to Paragraph 6–11bb.
3. Collapse center s upport bushing 14 inward at the bushing splitline and remove. Remove ball 15.
4. Mount the center support in a lathe, using a four-jaw chuck on the center support bushing bore. Use a dial indicator to center the support so that runout is no more than 0.002 inch (0.05 mm).
5. Machine the OD of the suppo rt to 11.114 5–
11.1175 inch (282.30–282.40 mm) (Figure 6–53).
6. Machine a 10 degree chamfer on the front and back edges of the OD (Figure 6–53).
7. Machine two grooves on the center support OD. These grooves indicate that the support has been reworked for shim installation.
8. Clean and remo ve all machin ing burrs and debris.
Figu
Figure 6–52.re 6–52. IdenIdentificatification of Cention of Centerter Support — Eccentric vs. Non-Eccentric Support — Eccentric vs. Non-Eccentric CAUTION:
CAUTION:
Do not damage the center support bushing bore Do not damage the center support bushing bore with the chuck jaws.
with the chuck jaws.
DIM. support (anchor bolt hole location) support (anchor bolt hole location)
NON-ECCENTRIC SUPPORT:
NON-ECCENTRIC SUPPORT:
DIM.
DIM.AA – – Measured directly Measured directly opposite DIM.
opposite DIM.BB location location
DIM. equivalent to the reworked center support bolt counterbore. The color will be visible from the valve body mounting face, allowing identifica-tion of a reworked support without complete transmission disassembly.
10. The reworked support requires the installation of shim 29 (P/N 23046695) during transmis-sion reassembly. Refer to Paragraph 7–3nn.
e.
e. AsAssesemmblblyy (Foldout 8,B)
1. If bushing 14 and check ball 15 were removed from the center support, replace with new parts.
2. Install the ball and bushing as illustrated in Figure 6–54. Use installer J 24794 to press the bushing into the center support. The bushing is pre-bored and requires no reaming.
NOTE:
NOTE:
If the pistons are not installed to the bottom of their If the pistons are not installed to the bottom of their cavities during installation of push-on nuts 6 and 22, cavities during installation of push-on nuts 6 and 22, proper clutch clearance cannot be established.
proper clutch clearance cannot be established.
Figu
Figure 6–53.re 6–53. RewRework of Centork of Cent er Supper Support toort to Eccentric Configuration Eccentric Configuration
V03299
11.1145 11.1145 – –11.1175"11.1175"
(282.30 0.030 – –0.060"0.060"
(0.80
RE
REBU BUIL ILD D OF OF SU SUBA BASS SSEM EMBL BLIE IES S
3. Temporarily place third clutch piston 9 in the front piston cavity of center support assembly 13. Install springs 8 into the pockets of the pis-ton. Align spring retainer 7 on the four ejector-pin bosses of the piston. Compress the springs by forcing the retainer into the recess at the outer edge of the center support. Install four new push-on nuts 6 (Figure 6–55) on the ejec-tor pins of the piston, using lock ring installer J 24453. Remove the piston from the center support.
4. Repeat the procedure in Step (3) to assemble second clutch piston components 19 through 22 into the rear cavity of center support assem-bly 13.
NOTE:
NOTE:
The lips of both the inner and outer sealrings must The lips of both the inner and outer sealrings must face the piston cavities of the center support.
face the piston cavities of the center support.
5. Install inner sealrings 10 and 18, and outer sealrings 11 and 17, onto pistons 9 and 19. Re-tain the sealrings with oil-soluble grease.
Figu
Figure 6–54.re 6–54. CenteCenter Support Bushinr Support Bushin g Installag Installa tiontion Notch must be NOTE: After assembly, bushing must withstand 500 lb (2224 N) end load in direction of arrow X.
SECTION
6. Inspect the piston cavities in center support as-sembly 16 for any obstruction or foreign mate-rial. Install piston 19 into the rear of the center support, engaging the lug on the piston with the recess in the support. Leave the assembled third clutch piston out of the center support un-til final installation of the center support as-sembly in Paragraph 7–3nn.
7. If oil filter 24 and sealring 23 were removed, install the new filter, closed end of the cone first, and sealring into the center support. The sealring on the filter must seat against the shoulder in the support. Center supports with-out a fourth clutch filter can be reworked to in-clude the filter with counterbore cutter J 29032.
NOTE:
NOTE:
Do not install center support sealrings 12 (Foldout Do not install center support sealrings 12 (Foldout 8,B) onto the support hub until final a
8,B) onto the support hub until final a ssembly of thessembly of the transmission. Refer to Paragraph 4–6
transmission. Refer to Paragraph 4–6 f f and 7–3 and 7–3 n n..
NOTE:
NOTE:
•• For MT 640, 643 proceed to Paragraph 6–13.For MT 640, 643 proceed to Paragraph 6–13.
•• For MTB 643, proceed to Paragraph 6–14.For MTB 643, proceed to Paragraph 6–14.
Figure 6–55.
Figure 6–55. Installing Installing Retainer Ring Retainer Ring and Push-Oand Push-On Nutsn Nuts
H00073.01