69D and 769D Off-Highway Trucks and 771D Quarry Truck Machine Systems Caterpillar

Service and Parking Brake (Rear) - Disassemble

Usage:

769D 5SS

Disassembly Procedure

Show/hide table

Table 1
Required Tools
Tool	Part Number	Part Description	Qty
A	FT-0120	Lifting Bracket	1
B	FT-0797	Lifting Hook Bracket	1
C	164-4622	Clamp Assembly	1
D	1P-7405	Eyebolts	2
E	8S-1378	Remover, Stud, and Resetting	1

Start By:

Remove the service and parking brake. Refer to Disassembly and Assembly, "Service and Parking Brake (Rear) - Remove".

Show/hide table




Illustration 1	g02965742

Remove 13 friction discs, and 13 outer plates from brake housing (2) . Remove damper assembly (1) .

Show/hide table




Illustration 2	g00484006

Position Tool (A) , as shown. Attach Tool (A) to a suitable hoist. Remove brake hub (3) from brake housing (2) . The weight of the brake hub (3) is 33 kg (72.8 lb).

Remove 16 bolts (4) and the washers that fasten the backup plate to brake housing (2) .

Show/hide table




Illustration 3	g00484007

Remove ring seal (5) and the seal ring from brake hub (3) .

Show/hide table




Illustration 4	g00484008

Position Tool (B) on backup plate (7) , as shown. Attach Tool (B) to a suitable hoist. Remove four nuts (6) evenly. Remove four nuts (6) gradually. Remove the backup plate from the brake housing. The weight of the backup plate is 29 kg (64 lb). Use Tool (E) to remove the taperlock studs from the brake housing.

Show/hide table




Illustration 5	g00484009

Remove O-ring seal (8) from brake housing (2) .

Show/hide table




Illustration 6	g00484228

Show/hide table

Personal injury can result from being struck by parts propelled by a released spring force.
Make sure to wear all necessary protective equipment.

Follow the recommended procedure and use all recommended tooling to release the spring force.

Use Tool (C) (not shown) to compress spring (9) . Remove the pin that holds spring guide (10) in the piston.

Slowly release the tension of spring (9) . Remove Tool (C) .

Remove spring guide (10) and spring (9) from the inside of the housing support.

Repeat Step 7 through Step 9 for the remaining three spring guides (10) .

Remove four springs (9) and spring guides (10) from the housing support.

Show/hide table




Illustration 7	g00484229

Use two 3/8 inch - 16 NC forcing screws (12) to separate piston (11) from cylinder (13) .

Show/hide table




Illustration 8	g00484231

Remove two plastic ring seals (14) and the two rubber ring seals from piston (11) .

Show/hide table




Illustration 9	g00484234

Remove four bolts (15) and the washers that fasten housing support (16) to cylinder (13) .

Show/hide table




Illustration 10	g00484236

Install Tooling (D) to housing support (16) . Fasten a suitable lifting device to Tooling (D) . Attach the lifting device to a hoist. Remove housing support (16) and the housing from cylinder (13) . The weight of housing support (16) and the housing is 52 kg (115 lb). Remove the three O-ring seals from housing support (16) .

Show/hide table




Illustration 11	g00484239

Position housing support (16) , as shown. Remove 12 bolts (17) and the washers that fasten housing (18) to housing support (16) . Install Tooling (D) (not shown) to housing (18) . Attach a suitable lifting device to Tooling (D) . Attach the lifting device to a hoist. Remove housing (18) from housing support (16) . The weight of housing (18) is 30 kg (66.1 lb).

Show/hide table




Illustration 12	g00484263

Remove three O-ring seals (19) from the housing support.

Show/hide table




Illustration 13	g00484264

Put an alignment mark on piston (20) and housing (18) for assembly purposes. Put supports under piston (20) . Use a soft hammer to push housing (18) out of piston (20) .