793B Off-Highway Truck Air System and Brakes Service and Parking Brake (Rear) Caterpillar


Service and Parking Brake (Rear)
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Illustration 1g00294223


Illustration 2g00103689
Section A-A


Illustration 3g00103690
Section B-B


Illustration 4g00103692
Section C-C

(1) When you assemble the wheel to the machine, the plugs will be in the front set of ports and in the top set of ports.

(2) Torque for 47 studs ... 260 ± 40 N·m (192 ± 30 lb ft)

Note: Apply red Loctite 271 to studs (2) prior to assembly.

(3) Torque for 21 studs ... 400 ± 40 N·m (295 ± 30 lb ft)

Note: Apply red Loctite 271 to studs (3) prior to assembly.

(4) Torque for 55 bolts ... 500 ± 50 N·m (370 ± 37 lb ft)

(5) Torque for eight studs ... 100 ± 15 N·m (75 ± 11 lb ft)

(6) Torque for eight nuts ... 270 ± 25 N·m (200 ± 18 lb ft)

Note: Torque each nut (6) by one revolution to evenly pull down the housing. When all the nuts bottom out, tighten the nuts to the specified torque in the letter sequence that is provided in illustration 1.

(7) When you assemble the wheel to the machine, the plugs will be in the bottom ports.

Note: Rubber toric seals and all the surfaces that come in contact with rubber toric seals must be clean at the time of assembly. Allow rubber toric seals and all the surfaces that come in contact with rubber toric seals to dry before the time of assembly. Immediately before assembly, put a small amount of oil on any surfaces that contact the rubber toric seals. Seal rings must be assembled squarely with the bore. Rubber toric seals should not be twisted. Do not allow the rubber toric seals to bulge.

(8) Torque for 12 studs ... 100 ± 15 N·m (75 ± 11 lb ft)

(9) Torque for 12 nuts ... 270 ± 25 N·m (200 ± 18 lb ft)

Note: Torque each nut (9) by one revolution to evenly pull down the housing. When all the nuts bottom out, tighten the nuts to the specified torque in a crisscross pattern.

(10) Assembled brake pack

Thickness of 15 new discs, 14 new plates, and two new damper assemblies ... 123.70 ± 2.60 mm (4.870 ± 0.102 inch)
Thickness of one new 7T-2815 Friction Disc ... 5.08 ± 0.08 mm (0.200 ± 0.003 inch)
Thickness of one new 8W-0212 Plate ... 2.413 ± 0.064 mm (0.0950 ± 0.0025 inch)
Thickness of one new 6G-6500 Damper Assembly ... 6.86 ± 0.25 mm (0.270 ± 0.010 inch)

Note: Install the damper assembly so that the facing material faces toward the plate and the piston.

Note: At assembly, lubricate the friction discs with the oil that is used in the brakes. See the Operation and Maintenance Manual, "Lubricant Viscosities"
for that information.

(11) Torque for 44 bolts ... 500 ± 50 N·m (370 ± 37 lb ft)

(12) 9D-6093 Spring (outer)

Quantity ... 46
Test length ... 90.5 mm (3.56 inch)
Test force ... 4235 ± 254 N (952 ± 57 lb)
Free length after test ... 116.5 mm (4.59 inch)
Outside diameter ... 46.02 mm (1.81 inch)

(13) 9D-6135 Spring (inner)

Quantity ... 42
Test length ... 90.50 mm (3.56 inch)
Test force ... 1535 ± 44 N (345 ± 10 lb)
Free length after test ... 115.49 mm (4.55 inch)
Outside diameter ... 26.59 mm (1.05 inch)

(14) 9D-9121 Spring (return)

Quantity ... 4
Test length ... 74.90 mm (2.95 inch)
Test force ... 890 ± 27 N (200 ± 6 lb)
Free length after test ... 91.13 mm (3.59 inch)
Outside diameter ... 26.59 mm (1.05 inch)

(15) Torque for 12 bolts ... 500 ± 50 N·m (370 ± 37 lb ft)

Information System:

322B, 322B L, 325B and 325B L Excavators Operation
793B Off-Highway Truck Air System and Brakes Service and Parking Brake (Front)
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IT28G Integrated Toolcarrier Material Handling Arm Rated Load
3208 Marine Engine Cooling System Supplemental Coolant Additive (SCA) - Test/Add
IT28G Integrated Toolcarrier Bucket Rated Load
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793C and 793C XQ Off-Highway Truck Hydraulic System Hoist Cylinder
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950G Wheel Loader, 962G Wheel Loader and IT62G Integrated Toolcarrier Braking System Service Brakes
3208 Marine Engine Water/Supplemental Coolant Additive (SCA)
IT28G Integrated Toolcarrier Battery Disconnect Switch
631E Series II Wheel Tractor-Scrapers Tire Inflation with Nitrogen
561M Pipelayer Cooling System Additive (DEAC) - Add
IT28G Integrated Toolcarrier Pallet Fork Rated Load
322B, 322B L, 325B and 325B L Excavators Operating Technique Information
561M Pipelayer Seat Adjustment
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IT28G Integrated Toolcarrier V-Belts - Inspect/Adjust/Replace
IT28G Integrated Toolcarrier Attachment Arm and Cylinder Linkage - Lubricate
IT28G Integrated Toolcarrier Battery Electrolyte Level - Check
IT28G Integrated Toolcarrier Bulldozing and Dumping
IT28G Integrated Toolcarrier Cooling System Coolant Additive (DEAC) - Add