Procedure to Rework the Latches for the Rear Access Egress System RAES on the 993K Wheel Loaders{0679, 7011, 7256, 7273, 7277} Caterpillar

Introduction

The following Special Instruction is used to rework the latches for the Rear Access Egress System RAES on 993K Wheel Loaders.

Do not perform any procedure that is outlined in this publication until you understand the information that is contained in this document.

Refer to Special Instruction, REHS1841, "General Welding Procedures" for information on any general welding procedures.

Required Parts for the Rework Procedure

Removal and Rework Procedure

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Illustration 1	g01963172
(1) 313-4593 Access Door Gp

1. Remove access door (1) and retain the hardware.

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Illustration 2	g01963179
(2) 316-5580 Handrail Gp

2. Remove two handrails (2) and retain the hardware.

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Illustration 3	g01963355
(3) 313-4592 Plate (4) 313-4588 Post Assembly

3. Remove plate (3) from post (4) .

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Illustration 4	g01963388
(5) 321-5259 Bracket (A) 25.4 mm (1 inch) (B) 1127 ± 1.5 mm (44.4 ± 0.06 inch)

4. Place bracket (5) onto post (4). The new location of bracket (5) is measured from the center of the bottom mounting hole to the center of the bracket. Tack weld the bracket in place. Finish this step by welding bracket (5) onto post (4) with a 3 mm (0.12 inch) fillet weld. Refer to Illustration 4 for the proper weld location.

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Illustration 5	g01963361
(6) 9C-4935 Plate (7) 318-4885 Handrail As

5. Remove plate (6) from handrail (7) and retain the hardware.

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Illustration 6	g01963422
(7) 318-4885 Handrail As (8) 9C-4935 Plate (9) Mounting hole (C) 54.2 mm (2.10 inch) (D) 971 ± 1.5 mm (38.22827 ± 0.06 inch)

6. Measure up distance (D) from the center of hole (9) on handrail (7). The center of the bottom hole in plate (8) is the end point of measurement (D). Tack weld plate (8) onto handrail (7). Verify that the measurements for the new location for plate (8) are correct. Finish this step by welding plate (8) onto handrail (7) with a 3 mm (0.12 inch) fillet weld. Refer to Illustration 6 for the proper weld location.

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Illustration 7	g01963378
(7) 8X-5942 Block (10) 313-4601 Handhold As

7. Remove plate (8) from handrail (10) and retain the hardware.

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Illustration 8	g01963439
(10) 313-4601 Handhold As (11) 8X-5942 Block (12) Mounting hole (E) 230.8 ± 2 mm (9.1 ± 0.10 inch) (F) 980 ± 2 mm (39 ± 0.10 inch) (G) 73.2 mm (3 inch)

8. The new location for block (11) is found by measuring up distance (F) from the center of hole (12). The center of the bottom hole in block (11) is the end point of measurement (F). The next measurement is taken from the center of hole (12) to the center of the top hole in block (11) until distance (E) is reached. The center of the top hole in block (11) is the end point of measurement (E). Tack weld block (11) in place. Verify that the measurements for the new location of block (11) are correct. Finish this step by welding block (11) onto handrail (10) with a 3 mm (0.12 inch) fillet weld. Refer to Illustration 8 for the proper weld location.

Installation Procedure for the New Door Assembly and the New Handrail Assemblies

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Illustration 9	g01963857
(1) 316-5580 Handrail Gp (2) 313-4593 Access Door Gp (3) 347-4604 Handrail Gp

1. Install the following new parts with the existing hardware. Refer to Illustration 9.
   • 313-4593 Access Door Gp

   • 316-5580 Handrail Gp

   • 347-4604 Handrail Gp

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Illustration 10	g01963858
(4) 348-2528 Plate (5) 347-4606 Plate

2. Install plate (4) onto the 8X-5942 Block . Now fasten the plate to the 313-4601 Handhold As with the existing hardware. Next install plate (5) onto the 318-4885 Handrail As that has been reworked. Now fasten plate (4) to the 318-4885 Handrail As with the existing hardware. Refer to Illustration 10.

Procedure for Adjustment of the Latches

Illustration 11	g01964999
(1) Location of latches

Illustration 12	g01965027
Typical view of latches

The improved latches can be adjusted for the proper fit. Each latch can be adjusted. LEFT, RIGHT, UP, DOWN, IN and OUT. These adjustments will help place the latch in a location parallel to the plate.