Differential, Reassembly and Installation

TM 10-3930-630-34

Replace all oil seals and gaskets at assembly.

10-16. Differential, Reassembly and Installation

a. Reassembly.

(1) Differential.

(a) Install thrust washer (31, fig. 10-6) in

bottom of flanged case (30). Position side gear (32),

spider (38), spider gears (35 and 27) and thrust washers

(34 and 36) into flanged case (30).

(b) Assemble side gear (33) and washer (31)

on spider and install plain case (29).

NOTE

Make sure case match marks (fig. 10-5) are

aligned.

Tighten screws and bend lock plate tabs over screws.

(d) Install bearing cups (9) and cones (8), on

differential assembly.

(2) Ring gear.

(a) Position two dowels (16, fig. 10-6) in ring

gear and align ring gear with dowel holes in flanged

case.

(b) Install screws (14) and draw ring gear in

Figure 10-7. Measuring shim thickness.

place. Tighten screws and lock with lock wires (13).

(3) Pinion gear.

(h) Install front shim pack (21) on shaft next

to pinion gear, press on front bearing cone (19) and

(a) Press bearing cups (24 and 25, fig. 106)

install assembly in carrier.

into differential carrier (26). Be certain they are firmly

(i) Install new oil seal (23), rear bearing cone

seated.

(22), rear shim pack (18) and spacer (20) on pinion shaft

(b) Press front bearing cone (19) on pinion

(17).

shaft (17) and position shaft in housing. Install rear

(j) Install pinion flange (12) on pinion and

bearing cone (22), pinion flange (12) and nut (11).

install nut (11).

Torque nut to 15 to 25 inch pounds (1.8 to 3.0 N' m)

(k) Torque slotted nut (11) to 15 to 25 inch

and spin gear to seat bearings.

pounds (1.8 to 3.0 N ) and recheck dimensions (para

(d) above). If dimension is correct, install cotter pin

carrier housing, but do not install bearing caps.

(10).

(d) Measure distance between face of pinion

b. Installation.

gear and outside diameter of differential case (fig. 10-7)

(1) Position differential on carrier and engage

Check number etched on end of pinion gear.

ring gear (15, fig. 10-6) and pinion (17). Install bearing

Shim pack thickness can be determined as follows:

caps (7) and secure with screws (6). Do not tighten.

1. Number etched on pinion gear plus 0.171

Install adjusting nuts (4).

inch (4.34 mm) equals proper dimension (example

NOTE

0.004 on pinion gear equals 0.175 inch for proper

Be certain bearing cups (9) and

dimension).

bearing caps (7) are installed in

2. Subtract feeler gage dimension from this

original position as marked during

dimension (example 0.175 inch minus feeler gage

removal.

thickness of 0.012 inch (0.304 mm) equals 0.163 inch

(2) Using a dial indicator and spanner tool on

(4.15 mm) thickness of shim pack).

adjusting nut (4) as illustrated in figure 10-8, adjust ring

(e) Assemble a compressed shim pack of

gear laterally for a backlash of 0.005 to 0.010 inch

shims (18 and 21, fig. 10-6) and measure with a

(0.127 to 0.254 mm). To increase backlash, loosen

micrometer to make up thickness of pack determined

adjusting nut nearest ring gear, and tighten the one

above.

opposite. To decrease backlash, reverse procedure.

(f) Remove differential assembly and pinion

(3) Coat entire ring gear with Prussian Blue or

shaft from carrier.

white lead.

(g) Remove front bearing cone (19) from

(4) Rotate ring gear several times, holding

pinion (17). Remove rear bearing cone (22).

back on pinion to create load effect.

(5) Inspect teeth of pinion and compare with

10-8