Usage:
Start By:
a. remove axles
Fluid Spillage Containment
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the machine. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to "Tools And Shop Products Guide", NENG2500 for tools and supplies suitable to collect and contain fluids in Caterpillar machines. Dispose fluids according to local regulations and mandates.
NOTE: The left and right brake housing assemblies are identical. All operations covered in this section must be performed on both the right and the left brake housing assemblies.
1. Remove plate carrier (3) from brake housing (1) and discs and plates (2).
2. Remove plate pack (2).
3. Place alignment marks on bushing (4) located on the inside portion of brake housing (1). Carefully remove bushing (4) from the two pins which hold it.
NOTE: The direction and position of the grooves in bushing (4) are important. The direction of these grooves are important for proper lubrication. It will be necessary to replace this bushing in exactly the same manner.
4. Using a suitable lifting device, remove brake housing (1) from differential housing.
NOTE: Remove brake housing slowly to prevent damage to the bevel gear assembly. Be prepared to secure bevel gear from falling out of the differential housing.
5. Remove large O-ring (5) from brake housing (1).
6. Loosen ten hex head screws (8), remove spring caps (7) and compression springs (6).
7. Remove six screws (9) of the automatic brake adjuster.
8. Remove cap (10). Using either a small hydraulic pump or air pressure push piston (11) out of brake housing.
NOTE: Apply pressure at the brake hydraulic fitting. Place a covering such as shop towel over the brake housing while performing this procedure. This will prevent the sudden release of hydraulic fluid from the brake housing.
9. Remove grooved ring (12), grooved ring (14) and backup ring (13) an (15) from the brake housing.
NOTE: Identify and record the order of O-rings (12) and (14) and back-up rings (13) and (15).
10. Remove six rings (16) from piston (11). Each of the rings is located under each of six screws (9).
11. Remove sixteen lock nuts (17) and six guide pins and ten studs from brake housing
12. Remove bearing race (18) from brake housing (11)
Assemble Brakes (Rear) (All Wheel Steer)
Fluid Spillage Containment
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the machine. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to "Tools And Shop Products Guide", NENG2500 for tools and supplies suitable to collect and contain fluids in Caterpillar machines. Dispose fluids according to local regulations and mandates.
NOTE: Both the left and the right brake housing are identical. Only one brake housing will be displayed in this assembly story. Both brake housing must be assembled using the following procedure.
1. Remove the right and left brake housings if they were temporarily attached to the differential.
2. Mount thrust washer (1) with the lubricating groove facing upward and secure it by means of the two grooved pins (2). Installation depth of the pins should be 0.3 to 0.6 mm (.01 to .02 in).
3. Install ten pins (3) if they were not previously installed.
4. Insert six guide pins (4) in the bore of brake housing and secure by means of sixteen lock nuts (5). Tighten lock nuts to a torque of 34 N·m (25 lb ft).
NOTE: Use new lock nuts to secure the sixteen pins. Removal of the pins and nuts during disassembly may have damaged some of the nuts.
5. Lightly lubricate and install grooved O-rings (7) and backup rings (8) into the grooves in the brake housing (6). Install sealing lip of grooved O-rings facing toward the piston.
6. Install O-rings as shown above.
7. Lightly lubricate piston (9). Place piston in the brake housing against the shoulder. Check for proper alignment using the marks placed on the piston and the brake housing during disassembly.
8. Using a tooling (A), press piston (9) into brake housing (6).
9. The illustration above shows the components of the automatic brake adjuster.
10. Insert ring (10) into piston (9) until it is fully seated in the bottom of the piston against pin (4).
11. Apply some 9S3263 Threadlocker to the threads of six screws (11) and tighten screws (11) to a torque of 9.5 N·m (7 lb ft).
12. Slide compression spring (12) and spring cage (13) over guide pins (3) and secure them by means of screw (14). Apply some 9S3263 Threadlocker to the threads of six screws (14) and tighten screws (11) to a torque of 9.5 N·m (7 lb ft).
13. If spring pin (15) was removed, insert spring pin (15) in the side of the brake housing and drive it into place until it has bottomed out.
14. If spring pin (16) was removed, insert spring pin (16) in the side of the differential housing and drive it into place until it has bottomed out.
15. Lubricate O-ring (17) and insert it into the groove on both brake housings.
16. Attach a suitable lifting device to brake housing (6) and install both brake housings onto the differential housing. Install three bolts and washers to hold the brake housings in place until the next several steps are completed.
17. Install brake pack (18) consisting of five plates and four discs. The plates and discs should installed in an alternate fashion with a plate be on the outside of both ends of the pack.
18. Install the brake pack into the brake housing so that the five plates fit into the notches on the inside of the brake housing.
19. Install plate carrier (19) into the center of the brake pack. Turn the plate carrier to engage all four of the discs until the plate carrier is fully seated.
20. Mount thrust washer (20) with the lubricating groove facing upward and secure it by means of the two grooved pins (21). Installation depth of the pins should be 0.3 to 0.6 mm (.01 to .02 in).
21. Lightly lubricate O-ring (22) and install O-ring in groove on axle housing facing brake housing.
22. Carefully remove the three retaining bolts installed earlier. Using a suitable lifting device position axle housing (23) in position on the brake housing. Align the marks placed on the two housings during disassembly. Insure that the spring pin in the brake housing will fit into the hole on the face of the axle housing.
23. If the final drive and axle have already been installed in the axle housing, align the spline of the axle with plate carrier (19) and insure that both splines have meshed. Rotate the final drive slightly to accomplish this.
24. Install sixteen axle housing bolts (24) securing the axle housing, and brake housing to the differential housing. Tighten bolts (24) to a torque of 195N·m (144 lb ft).
NOTE: After installation of the brakes and axle, check the axle for the proper amount of lubricant. Consult the Operation And Maintenance Manual, Caterpillar Publication number SEBU6873 for the proper lubricant levels.
End By:
a. install axles