- Off-Highway Truck/Tractor
- 770G (S/N: RMA1-101; TWA1-152; KDH1-367; ECM1-355; ECX1-114)
- 772G (S/N: TWB1-249; LTS1-437; KEX1-266; LTX1-207)
Description Of Change: The brake control group has been improved on the machines listed above. New hose arrangement is used to provide simplified brake pump pressure testing.
Adaptable To:
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| Illustration 1 | g06148700 |
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(1) (2) | |
New 520-5004 Hose As (1) and 508-4183 Hose As (2) are part of the service brake control group.
New hose assembly (1) and hose assembly (2) are adaptable to machines within the listed serial numbers, and are effective with all machines after the listed serial numbers.
Use the below rework procedure to install new hose assemblies in the service brake control group.
Rework Procedure
| NOTICE |
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Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting, and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to Special Publication, PERJ1017, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat® products. Dispose of all fluids according to local regulations and mandates. |
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Hot hydraulic oil under high pressure can remain in the components of the hydraulic system or the power train system after the engine has been stopped. The uncontrolled release of the hydraulic oil can cause sudden machine movement and can also result in the following conditions:
If hydraulic oil penetrates body tissue, the injury must be treated immediately by a doctor who is familiar with this type of injury. Use a board or a piece of cardboard to check for a hydraulic oil leak. Make sure that all of the attachments have been lowered to the ground and that all trapped pressure has been released from the hydraulic system and the power train system. Also, make sure that the hydraulic oil is cool before the removal of any components or lines. Remove the hydraulic oil filler cap only when the engine is stopped and the filler cap is cool enough to touch with your bare hand. |
| Parts List | |||
| Item | Qty | Part | Description |
| 1 | 1 | Hose As | |
| 2 | 1 | Hose As | |
| 3 | 1 | Fitting | |
| 4 | 1 | O-Ring Seal | |
| 5 | 1 | O-Ring Face Seal Swivel Tee | |
| 6 | 2 | O-Ring Seal | |
| 7 | 1 | Fitting | |
| 8 | 1 | O-Ring Seal | |
| 9 | 1 | Dust Cap | |
| 10 | 1 | O-Ring Seal | |
| 11 | 1 | Clip | |
| 12 | 1 | Clip | |
| 13 | 1 | Grommet | |
| 14 | 1 | Spacer | |
| 15 | 3 | Hard Washer | |
| 16 | 1 | Nut | |
| 17 | 1 | Taperlock Stud | |
| 18 | 1 | Spacer | |
| 19 | 1 | Bolt | |
| 20 | 1 | Nut | |
- Move machine to safe area and secure
- Place truck in parking position
- Shut off engine
- Chock wheels
- Shut off main disconnect
- Relieve the pressure from the system, move the engine start switch to the OFF position. Refer to Operation and Maintenance Manual, SEBU8491, System Pressure Release for more information.
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Illustration 2 g06148710 Show/hide table
Illustration 3 g06148712 View of Area A
(B)317-6860 Hose As
(C)362-4843 Tube As
(D)348-1769 Hose As - Remove hose assembly (D) and tube assembly (C) between the brake charge pump and brake oil filter base. Discard the hose assembly (D) and tube assembly (C) and retain the hardware for reuse. Remove the straight fitting from the oil filter base.
- Remove and discard hose assembly (B) from the brake control valve.
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Illustration 4 g06148714 (1) 520-5004 Hose As
(3)5E-9684 Fitting
(4)238-5084 O-Ring Seal - Install hose assembly (1) on brake control valve.
- Install fitting (3) with O-Ring seal (4) to filter base.
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Illustration 5 g06148717 (3) 5E-9684 Fitting
(5)8T-4834 O-Ring Face Seal Swivel Tee
(6)228-7093 O-Ring Seal
(7)6V-3965 Fitting
(8)214-7568 O-Ring Seal
(9)6V-0852 Dust Cap - Install O-Ring face seal swivel tee (5) to fitting (3) with two O-Ring seals (6).
- Install fitting (7), O-Ring seal (8), and dust cap (9) to swivel tee (5).
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Illustration 6 g06148720 (2) 508-4183 Hose As
(5)8T-4834 O-Ring Face Seal Swivel Tee
(10)4J-0520 O-Ring Seal - Install hose assembly (2) with O-Ring seal (10) to swivel tee (5) and pump. Use hardware that was retained in Step 3to secure hose assembly (2) to pump.
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Illustration 7 g06150625 (E) 133-7810 Taperlock Stud - Remove and discard taperlock stud (E) used to secure the hose to the inside of the frame rail.
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Illustration 8 g06148731 (2) 508-4183 Hose As
(11)5P-7468 Clip
(12)5P-7469 Clip
(13)5P-8444 Grommet
(14)133-6934 Spacer
(15)8T-4121 Hard Washer
(16)8T-4133 Nut
(17)259-7140 Taperlock Stud - Install taperlock stud (17) to the boss on the inside of the frame rail. Place the hose clip back on the stud.
- Secure hose assembly (2) to stud (17) using spacer (14), clip (11), clip (12), grommet (13), hard washer (15), and nut (16).
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Illustration 9 g06148733 (2) 508-4183 Hose As
(11)5P-7468 Clip
(12)5P-7469 Clip
(13)5P-8444 Grommet
(15)8T-4121 Hard Washer
(18)091-7717 Spacer
(19)8T-4196 Bolt
(20)344-5675 Nut - Install plate (18) behind the hose clip on the inside of the front cab support.
- Secure hose assembly (2) to plate (18) using clip (11), clip (12), grommet (13), bolt (19), hard washer (15), and nut (20).
- Return machine to service.
