Larger Front Apron Cylinders are Now Used on Certain Asphalt Pavers {5102, 7562} Caterpillar

Asphalt Paver

AP1000F (S/N: AC4303-440)

AP1055F (S/N: TJ5570-950)

AP500F (S/N: 503103-110; AF51-101; 449120-149; F5M1-110)

AP555F (S/N: AP5174-272; M45104-105; 5F5112-112; RBM101-101)

AP600F (S/N: AP6146-201; JA6102-112; LR6112-125; D6F1-107)

AP655F (S/N: 480123-157; 452101-104; 453104-104; P65125-126; MH6254-417; ML6120-120; 479154-178)

AP655F L (S/N: AC6101-101)

Description Of Change: New front apron cylinders are now used on machines listed above. The new cylinders have larger bore to provide increased lifting force for the new straight hinge apron design.

Adaptable To:

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Do not operate or work on this product unless you have read and understood the instruction and warnings in the relevant Operation and Maintenance Manuals and relevant service literature. Failure to follow the instructions or heed the warnings could result in injury or death. Proper care is your responsibility.

1. Lower the hopper and raise the center apron to allow access to hydraulic cylinders.

2. Turn the machine off and lock out machine to prevent it from starting.

3. Use suitable blocking to support the front apron.

4. Remove and cap the four hydraulic lines that go to the fittings on the apron lift cylinders.

5. Remove 3B-4629 Cotter Pins that retain the hydraulic mounting pins.

6. Remove the mounting pins.
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   Illustration 1	g06395471

7. The new cylinders have a slightly larger outside diameter, so it is recommended to add a 5.0 mm (0.19 inch) chamfer to the front bumper at the location (A) indicated in Illustration 1.

8. Touch up the area where the material was removed with Yellow primer and Paint.

9. Note the orientation of the fittings in old hydraulic cylinders.

10. Remove the fittings from old cylinders.

11. Install two new seals (2) and two seals (3) in the fittings on each cylinder.
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    Illustration 2	g06395473

12. Install the fittings in the new cylinders with same orientation. For typical fitting orientation, refer Illustration 2.

13. Install the new cylinders (1) in the paver, and use the new cotter pins (1) to retain the mounting pins.

14. Remove the caps and install the hydraulic lines onto the fittings.

15. Remove the blocking and lockout on machine.

16. Start the machine and slowly cycle the front apron, to ensure there are no leaks and there is adequate clearance from the frame to the apron cylinders.

17. After ensuring there is no interference, cycle the apron ten times to purge air from the system.