Procedure for the Removal and the Replacement of the Engine Enclosure on the 631G and 637G Wheel Tractor-Scrapers{7251, 7405, 7553, 7557} Caterpillar

Wheel Tractor-Scraper:

631G (S/N: DFA1-334)

637G (S/N: DFJ1-366)

Introduction

This Special Instruction contains the necessary procedures and information for the removal and replacement of the engine enclosure of the 630G Tier III Wheel Tractor-Scraper.

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Do not attempt to disassemble or assemble this machine until you read and understand the disassembly and assembly instructions. Improper disassembly and assembly procedures could result in injury or death.

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Accidental engine starting can cause injury or death to personnel working on the equipment. To avoid accidental engine starting, disconnect the battery cable from the negative (−) battery terminal. Completely tape all metal surfaces of the disconnected battery cable end in order to prevent contact with other metal surfaces which could activate the engine electrical system. Place a Do Not Operate tag at the Start/Stop switch location to inform personnel that the equipment is being worked on.

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Personal injury can result from flame cutting or welding on painted areas. The effect of gasses from burned paint is a hazard to the person doing the cutting or welding. Do not flame cut or weld on painted areas.

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Personal injury or death can result from fumes, gases and ultraviolet rays from the weld arc. Welding can cause fumes, burn skin and produce ultraviolet rays. Keep your head out of the fumes. Use ventilation, exhaust at the arc, or both, to keep fumes and gases from your breathing area. Wear eye, ear and body protection before working. Protect yourself and others; read and understand this warning. Fumes and gases can be dangerous to your health. Ultraviolet rays from the weld arc can injure eyes and burn skin. Electric shock can cause death. Read and understand the manufacturer's instructions and your employer's safety practices. Do not touch live electrical parts. See "American National Standard Z49.1, Safety in Welding and Cutting" published by the American Welding Society. American Welding Society 2501 N.W. 7th Street Miami, Florida 33125 See "OSHA Safety and Health Standards, 29 CFR 1910", available from U.S. Department of Labor. U.S. Department of Labor Washington, D.C. 20210

The suggested tools and equipment should be readily available at the place of assembly. If the tools are not available, assembly will be more difficult and more time will be necessary to complete the assembly.

Do not perform any procedures until you read the information and you understand the information that is contained in this manual. Do not order any parts until you read the information and you understand the information that is contained in this manual.

Prepare the machine for use after you complete the assembly. Use the Parts Manual and Service Manual with this instruction.

ReferenceService Manual, RENR5780, "631G (S/N: DFA1-UP) Wheel Tractor-Scraper"

ReferenceParts Manual, SEBP4238, "631G (S/N: DFA1-UP) Wheel Tractor-Scraper"

ReferenceService Manual, RENR5790, "637G (S/N: DFJ1-UP) Wheel Tractor-Scraper"

ReferenceParts Manual, SEBP4240, "637G (S/N: DFJ1-UP) Wheel Tractor-Scraper"

Note: After completion of this Special Instruction, properly dispose of the following items:

• 240-9475 Front Hood As

Removal and Installation of the Engine Enclosure

Parts List

Table 1

Parts that are required for the installation of the 302-1540 Hood As
Part Number	Description	Quantity
291-2960 (1)	Plate	1
4M-5281 (1)	Bolt	4
5P-4115 (1)	Hard Washer	4
320-3258 (2)	Block	1
7X-0345 (3)	Bolt	3
198-4780 (3)	Hard Washer	7
291-2984 (3)	Plate As	1
302-1540 (3)	Hood As	1
7X-0343 (3)	Bolt	4
7K-1181	Cable Strap	10
4C-4200	Paint	1
Required parts needed to Improve the Stability of the Air Filter Frame.
317-6951	Plate As	1
314-2415	Support As	1
8T-4835	Bolt	3
198-4778	Hard Washer	3
315-4823 (4)	Boss	1 (3 (5))
269-3940	Latch As	2
283-2534	Latch Striker	2
311-8798 (3)	Bracket	4
4M-6425 (3)	Bolt	8
8T-4224 (3)	Hard Washer	16
6V-8189 (3)	Nut	8
4S-8287 (3)	Pop Rivet	16
117-9066	Latch As	4
315-5173	Plate	2
7X-0325	Bolt	4
9X-0941	Locknut	4
5P-1076	Hard Washer	8

( 1 )	Part not required on 637 push/pull machines.
( 2 )	Part is not required on S/N:DFA326-UP and ; S/N:DFJ350-UP machines.
( 3 )	Part is not required on S/N:DFA328-UP and ; S/N:DFJ352-UP machines.
( 4 )	Part is not required on S/N:DFA331-UP and ; S/N:DFJ365-UP machines.
( 5 )	Three pieces are required on S/N:DFA1-217 and ; S/N:DFJ1-276 machines.

Table 2

Parts that are Required for the Installation of the Films for the 631G Wheel Tractor-Scraper
Part Number	Description	Quantity
253-0861 (1)	Film	1
266-9903 (1)	Film	1
281-7268 (1)	Film	1
266-9899 (1)	Film	1

( 1 )

Part is not required on machines after S/N:DFA328-UP.

Table 3

Parts that are Required for the Installation of the Films for the 637G Wheel Tractor-Scraper
Part Number	Description	Quantity
253-0861 (1)	Film	1
266-9903 (1)	Film	1
281-7268 (1)	Film	1
266-9901 (1)	Film	1

( 1 )

Part is not required on machines after S/N:DFJ352-UP.

Required Tooling

Table 4

Tooling that is Required for the Installation of the Engine Enclosure

Description

17/32 Drill Bit

5/8 - 11 Tap

21/64 Drill Bit

Rivet Tool

Magnetic Drill

9/16 Drill Bit

27/64 Drill Bit

1/2-13 Tap

Note: A welder is required for the ""Preparation of the Holes for the Engine Enclosure" ".

Illustration 1	g01428558
In order to manufacture T-Plate (AK), use 12.7 mm (0.5 inch) steel.

Note: T-Plate (AK) will be used to locate the additional support block on machines with the following serial numbers: (S/N: DFA1-325; DFJ1-349)

Note: T-Plate (AK) can be used on multiple machines.

Table 5

T-Plate Specifications
Item	Dimension
A	106 mm (4.17 inch)
B	404.5 mm (15.93 inch)
C	13.8 mm (0.54 inch)
D	20 mm (0.79 inch)
E	80 mm (3.15 inch)
F	146.5 mm (5.77 inch)
G	185 mm (7.28 inch)
H	30 mm (1.18 inch)
J	60 mm (2.36 inch)
K	17 mm (0.67 inch)
L	15.9 mm (0.63 inch)
M	487.5 mm (19.19 inch)

Torque Specifications

Unless a torque is specified in this instruction, all bolts should be torqued to the standard torque that is found in Specifications, SENR3130, "Torque Specifications for All Caterpillar Products".

Specifications for Cables, Chains, and Lifting Devices

Use approved cables, chains, and lifting devices in order to lift components. Refer to the manufacturer's literature in order to determine the application when you select cables, chains, and lifting devices. When you lift a component, the lift angle is critical. Refer to the Illustration that follows in order to see the effect of the lift angle on the working load limit.

Illustration 2	g00629745
Lift angles for lifting slings (A) The load capacity is 100 percent of the working load limit for the sling. (B) The load capacity is 86 percent of the working load limit for the sling. (C) The load capacity is 70 percent of the working load limit for the sling. (D) The load capacity is 50 percent of the working load limit for the sling.

Sequence for the Removal of the Engine Enclosure

Note: The following sequence is recommended for the removal of the engine enclosure for machines with the following serial numbers: (S/N: DFA1-327; DFJ1-351)

The following list of major components is suggested for the removal of the engine enclosure.

1. 240-9476 Access Door As

2. 240-9475 Front Hood As

Sequence for the Installation of the Engine Enclosure

Note: The following sequence is for the installation of the engine enclosure for machines with the following serial numbers: (S/N: DFA1-327; DFJ1-351)

The following list of major components is suggested for the installation of the engine enclosure.

1. 240-9476 Access Door As

2. 302-1539 Scraper Hood Gp

3. Film Groups

Removal Procedures for the Engine Enclosure

Removal of the Hood Group

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Illustration 3	g01425821
View of the hood that is being removed from the machine

1. Attach a suitable lifting device to top hood (A). The weight of the top hood is approximately 78 kg (172 lb).

2. Raise top hood (A) in order to gain access to struts (B) .

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Illustration 4	g01425831
View of strut that is being disconnected

3. Disconnect the left and right struts (B) at the connection to the top hood. Retain all removed parts (C) .

4. After the hardware has been removed, place struts (B) downward.

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Illustration 5	g01425816
View of the hood and bolts that are being removed

5. Remove nine bolts (D) and nine washers (E) that attach top hood (A) to the machine. Retain bolts (D) and washers (E). This hardware will be reused later in this Special Instruction.

6. Remove top hood (A). Set the hood aside to be reused at a later time.

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Illustration 6	g01442733
View of front right side door that is being removed

7. Remove the front right side door (F) from the front hood (G). Retain all mounting hardware (BM). This hardware will be reused later in this Special Instruction.

Removal of the Front Hood Panel

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Illustration 7	g01439468
View of the bolts that are being removed on the grill assembly

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Illustration 8	g01425873
View of the removal of the grill assembly

1. Remove four bolts (H) and remove four washers (J) that secure grill assembly (K) to front hood (G) .

2. Remove the grill assembly and retain the hardware.

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Illustration 9	g01425877
View of the removal of the bumper assembly

3. If the procedure is applicable, remove bumper assembly (L), by removing hardware (BJ). The removal of bumper assembly (L) is not required on the 637G machines.

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Illustration 10	g01436896
View of front hood

4. If the machine is not equipped with a bail cylinder, remove four bolts (M) and remove four washers (N). Discard plate (P) and hardware (M-N) .

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Illustration 11	g01436939
View of front hood that is being removed

5. Attach a suitable lifting device to front hood (G). The weight of front hood (G) is approximately 94 kg (207 lb).

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Illustration 12	g01425882

6. In order to remove front hood (G), remove the three bolts (R) and washers (S) on the inside of the right side of the front hood (G). Retain all hardware. This hardware will be reused later in this Special Instruction.

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Illustration 13	g01440413

7. Remove the three bolts (T) and washers (U) on the outside of the left side of the front hood (G). Retain all hardware. This hardware will be reused later in this Special Instruction.

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Illustration 14	g01431221
View of harness that is being removed

8. Disconnect the harness at plug connection (V) that is located in the front left location. Remove the harness from radiator (W). Retain all hardware. This hardware will be reused later in this Special Instruction.

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Illustration 15	g01431230
View of harness that is being removed

9. Disconnect the harness from the ether aid (X), front washer fluid bottle (Y), and rear washer fluid bottle (Z) .

10. Remove front hood (G) .

11. Retain the front hood for needed parts later in this Special Instruction.

Removal of the Bail Cylinder (If Equipped)

1. Release the hydraulic system pressure.

   ReferenceSee Disassembly and Assembly, "Hydraulic System Pressure - Release" for your machine.

   Note: Ensure that the connections are capped after disassembly in order to prevent contamination.

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Illustration 16	g01437471
View of bail cylinder that is being removed

2. Attach a suitable lifting device to bail cylinder (AA). The weight of bail cylinder (AA) is approximately 29 kg (65 lb).

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Illustration 17	g01437474
View of hose assembly that is being removed

3. Disconnect hose assembly (AB) from bail cylinder (AA) .

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Illustration 18	g01437475
View of hose and pin assemblies that are being removed

4. Remove hose assembly (AC) and pin assembly (AD) from bail cylinder (AA) .

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Illustration 19	g01437477
View of pin assembly and bail cylinder that is being removed

5. Remove pin assembly (BF) from bail cylinder (AA) .

6. Remove bail cylinder (AA) from the machine.

Preparation of the Frame for the Engine Enclosure

Table 6

Parts that are Required for the Installation of the Holes for the Engine Enclosure
Item	Part Number	Description	Quantity
1	7X-0345	Bolt	3
2	198-4780	Hard Washer	3
3	320-3258 (1)	Block	1
4	291-2984	Plate As	1

( 1 )

Part is not required on S/N:DFA326-UP and ; S/N:DFJ350-UP machines.

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Illustration 20	g01434754
View of support block that is being removed

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Illustration 21	g01425912
View of right side mounting block

1. Remove support block (AE) from mounting block (AF). Remove two bolts (AG) and two washers (AH). Mounting block (AF) and support block (AE) are located on the left side of the radiator.

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Illustration 22	g01435051

2. Verify distance (AJ) from the center line of the holes to the edge of the blocks on the right and left hand sides. Distance (AJ) should be a maximum of 37 mm (1.46 inch). If the distance is greater, cut the outside of the blocks.

3. On the right side mounting block (BM), grind a small chamfer that measures 3 mm (0.12 inch) to 4 mm (0.16 inch). The chamfer will allow clearance for the weld on the hood.

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Illustration 23	g01405204
View of support block that is being bolted to the T-Plate

4. Locate T-Plate (AK) on the existing mounting block (AF) .

5. Bolt support block (AE) on top of T-Plate (AK) with two bolts (AG) and two washers (AH) .

   Note: Ensure that the 13.8 mm (0.5433 inch) hole in T-Plate (AK) is toward the inside of the machine.

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Illustration 24	g01434730
View of new mounting hole location in left front frame rail

6. Locate the new hole location (AL) on the front bumper with T-Plate (AK) by using the 13.8 mm (0.5433 inch) hole.

7. By using a transfer punch, mark the location for the 13.8 mm (0.5433 inch) hole for the left side of the machine.

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Illustration 25	g01425913

8. Verify that the hole location is 1441 mm (56.7 inch) from the newly located hole (AL) to mounting hole (AM) on the right side of the support for the bumper.

9. After T-Plate (AK) is in the correct position, drill a hole that measures 17/32 inch.

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Illustration 26	g01425916
View of hole that is being tapped

10. Remove T-Plate (AK) .

11. Tap the hole for a 5/8-11 thread.

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Illustration 27	g01405203
View of mounting block that is being bolted to the T-Plate

12. Flip T-Plate (AK). Attach T-Plate onto the support for bumper (L) by using one bolt (1) and one washer (2) .

13. Fasten two bolts (AG) and two washers (AH) to support block (AE) and mounting block (AF) .

14. Shim the bottom surface or grind the bottom surface of new mounting block (3) in order to provide a minimal gap between the block and the deck plate.

15. Secure the new mounting block (3) for the frame to the T-Plate (AK) with two bolts (1) and two washers (2) .

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Illustration 28	g01434745
View of new block that is being welded

Note: Clean the paint before welding the surface around the block.

16. Weld new block (3) in place and paint the new block. The top of the new block should be in the same horizontal plane as the mounting surfaces of the other machines. Use a 6 mm (0.24 inch) fillet weld all the way around.

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Illustration 29	g01436998
View of support block that is being reinstalled

17. Remove T-Plate (AK) .

18. Clean the sides of the blocks and paint the sides of the blocks and the weld area.

19. Reinstall support block (AE) with two previously removed bolts (AG) and two washers (AH). Make sure that the recessed holes are located to the outside.

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Illustration 30	g01434763
View of left front bracket that is being installed

20. Install new left front support bracket (4) with three new bolts (1) and three new washers (2) .

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Illustration 31	g01405148
View of support block that is being aligned

21. Align support block (AE) with a 3 mm (0.1181 inch) gap (BH) on the inside of the plane of support bracket (4) .

Note: The alignment of the block is 3 mm (0.1181 inch) from support bracket (4) .

Preparation of the Hood Prior to Installation

Note: The following sequence is recommended for preparation of the hood on machines with the following serial numbers: (S/N: DFA1-327; DFJ1-351)

Note: Unless a torque is specified in this instruction, all bolts should be torqued to the standard torque that is found in Specifications, SENR3130, "Torque Specifications for All Caterpillar Products".

Table 7

Parts that are Required for the Preparation of the Hood
Item	Part Number	Description	Quantity
5	302-1540	Hood As	1
6	7X-0343	Bolt	4
7	198-4780	Hard Washer	4
8	291-2960 (1)	Plate	1
9	4M-5281 (1)	Bolt	4
10	5P-4115 (1)	Hard Washer	4

( 1 )

Part not used on 637 push/pull machines.

Installation of Lamps

1. Transfer engine shutdown switch (AT), plugs (AU), and harness (V) from old front hood (G) .

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Illustration 32	g01434769
View of headlights that are being transferred

2. Transfer headlights (AN) on the right and left hand side.

3. Transfer hinge (AV) to new hood (5) .

Removal and Installation of 160-6184 Flood Lighting Gp (If Equipped)

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Illustration 33	g01438439
View of lighting group that is being removed on the left and right side of machine

1. Remove four bolts (AW) and remove four washers (AX) from the front hood that was removed. Do not discard the hardware that was removed.

2. Move the lighting group to new hood (5) .

3. Install four washers (AX) and install four bolts (AW) in front hood (5) .

4. If necessary, adjust the aim of the side light. Tighten bolt (BG) to maximum torque of 20 N·m (15 lb ft). Tighten bolt (BH) to 25 ± 6 N·m (18 ± 4 lb ft).

Installation of the Front Hood and Top Hood

Note: The following sequence is recommended for installation of the front hood on machines with the following serial numbers: (S/N: DFA1-327; DFJ1-351)

Installation of the Front Hood

1. Attach a suitable lifting device to front hood (5). The weight of front hood group (5) is approximately 114 kg (250 lb).

2. Position front hood (5) on the machine.

   Note: New front hood (5) will be mounted to the new support bracket (4). Make sure that the hood hangs evenly from each side to each side for easy installation.

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Illustration 34	g01437658

3. Install three bolts (R) and three washers (S) on the inside of the right side front hood (5). Leave the bolts loose at this time.

   Note: Ensure that Step 3 is performed before proceeding.

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Illustration 35	g01442731

4. Install four bolts (6) and four washers (7) to the support bracket on the left side of the front hood. On the rear block, install three bolts (T) and three washers (U) on the outside of the left side of the front hood.

5. Tighten the bolts that were left loose in Step 3.

6. Reconnect the harness to the main chassis harness and secure the harness to the radiator with the removed hardware.

7. Visually check the clearance of the top air conditioning line that goes to the evaporator on the front of the cab. Adjust the air conditioning line.

8. Reconnect the harness to ether aid (X), front washer fluid bottle (Y), and rear washer fluid bottle (Z). Refer to Illustration 15 for the correct locations.

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Illustration 36	g01425873
View of grill assembly that is being installed

9. Install the grill assembly (K). Secure grill assembly (K) with four bolts (H) and four washers (J) .

10. If the procedure is applicable, reinstall bumper assembly (L) .

    Note: Reinstallation of bumper (L) is not required on 637G machines.

Cover for the Bail Cylinder

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Illustration 37	g01425921
View of new plate assembly that is being installed

1. Install the new plate assembly (8) with four bolts (9) and four washers (10) on the cover for the bail cylinder.

Installation of the Top Hood

1. Attach a suitable lifting device to top hood (A). The weight of top hood (A) is approximately 78 kg (172 lb).

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Illustration 38	g01434792
View of top hood that is being installed

2. Position hood (A) at hinge (AV) .

3. Reinstall nine bolts (D) and nine washers (E) in order to reinstall top hood (A) to the machine.

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Illustration 39	g01434793
View of strut that is being reconnected

4. Reconnect the left and right struts (B) with hardware (C) that was previously removed.

5. Adjust the latches for a 1 mm (0.039 inch) to 3 mm (0.19 inch) of deflection to the fork. Use Loctite on the jam nuts that are located on the latches.

Air Cleaner Modification and New Latch Installation

Note: The following sequence is recommended for the modification of the air cleaner on machines with the following serial numbers: (S/N: DFA1-334; DFJ1-366)

Procedure for Modification of the Air Cleaner

Note: The canister for the air filter will need to be removed for this procedure.

Table 8

Parts that are Required for the Installation of the Air Cleaner and Latches
Item	Part Number	Description	Quantity
11	317-6951	Plate As	1
12	314-2415	Support As	1
13	8T-4835	Bolt	3
14	198-4778	Hard Washer	3
15	315-4823 (1)	Boss	1 (3 (2))
16	315-5173	Plate	2
20	269-3940	Latch As	2
21	283-2534	Striker As	2
22	311-8798 (3)	Bracket	4
23	4M-6425 (2)	Bolt	8
24	8T-4224 (2)	Hard Washer	16
25	6V-8189 (2)	Nut	8
26	4S-8287 (2)	Pop Rivet	16
27	117-9066 (2)	Latch As	4
28	7X-0325	Bolt	4
29	9X-0941	Locknut	4
30	5P-1076	Hard Washer	8

( 1 )	Part is not required on S/N:DFA331-UP and ; S/N:DFJ365-UP machines.
( 2 )	Three pieces are required on S/N:DFA1-217 and ; S/N:DFJ1-276 machines.
( 3 )	Part is not required on S/N:DFA328-UP and ; S/N:DFJ352-UP machines.

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Illustration 40	g01435000
View of bonnet that is being removed

1. Remove canister (AZ) for the air filter and protect the air inlet for the turbocharger.

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Illustration 41	g01443376
View of plates that are being installed

2. Weld plates (16) into the correct location. On the brace, weld a 3 mm (0.12 inch) fillet weld.

3. Paint the braces for the air filter frame that have been welded.

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Illustration 42	g01435080
View of the cover plate for the battery that is being replaced

4. Replace the old battery cover assembly with the new battery cover assembly (11) by reusing the existing hardware.

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Illustration 43	g01435017
View of the support for the air filter frame that is being installed

5. Secure the support for the air filter frame assembly (12) with two bolts (13) and two washers (14) through the cover plate for the battery. Grind the tread plate flush under the mounting surface of the brace.

   Note: If the holes do not align on the battery box cover, refer to the next section.

6. Locate four bolt holes (BC) for the top of air filter frame assembly (12) .

   Note: Air filter frame assembly (12) should be perpendicular to battery cover assembly (11) .

7. Locate bolt hole (BB) for air filter frame assembly (12) in the front right deck plate.

8. After all holes (BB) and (BC) are located, remove the support in order to facilitate the drilling location. Drill holes (BC) 14.3 mm (9/16 inch) in all locations.

9. Drill hole (BB) in the front deck plate according to the following instructions.
   • Location (BB) uses a 14.3 mm (9/16 inch) drill bit on (S/N: DFA1-330) and (S/N: DFJ1-364) machines only.

   • Drill 27/64 and tap for a 1/2-13 thread on (S/N: DFA331-334) and (S/N: DFJ365-366) machines.

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Illustration 44	g01435024
View of air filter frame assembly that is being installed

10. Bolt the support assembly into the correct location by using four bolts (28), four nuts (29), and eight washers (30) at the stand for the air cleaner.

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Illustration 45	g01435328
View of boss that is being welded

11. Secure the bracket to the battery box cover with three bolts (13), three washers (14), and one boss (15) .

    Note: The boss is used on (S/N: DFA1-330) and (S/N: DFJ1-364) machines.

12. Weld boss (15) under the right front deck plate.

Modifications of the Battery Box Cover

Note: The following sequence is recommended for the modification of the battery box cover on machines with the following serial numbers: (S/N: DFA1-217; DFJ1-276)

1. On the back side of the cover, drill a pilot hole 27 mm (1 1/16 inch) forward from the center of the existing bosses.

2. On the bottom side of the tubing, enlarge the hole to 3/4 inch in order to allow the boss to slide into the tube.

3. On the top side of the cover, enlarge the hole to 17/32 inch in order to allow the bolts for the air filter frame assembly to fit.

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Illustration 46	g01469905
View of bosses that are being welded

4. Insert one 315-4823 Boss into each hole on the bottom side of the cover and weld into place.

Installation of the New Latches on Side Doors

Note: The following sequence is for the installation of the new latches for machines with the following serial numbers: (S/N: DFA1-327; DFJ1-351)

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Illustration 47	g01435115
View of latch assembly and striker that is being replaced

1. Replace latch as (20) and striker (21) on each side door.

2. Remove rear side door (BE) and retain all hardware.

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Illustration 48	g01404566
View of front side door (F)

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Illustration 49	g01404764
View of rear side door (BE)

3. Drill holes for the four new brackets (22) in each side door (F) and (BE).
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   Table 9

   Specifications for the Front and Rear Side Doors
   A	102 mm (4.02 inch)
   B	62 mm (2.44 inch)
   C	210 mm (8.2677 inch)
   D	10.5 mm (0.41 inch)
   E	577 mm (22.72 inch)
   F	81 mm (3.19 inch)
   G	41 mm (1.61 inch)
   H	525 mm (20.67 inch)

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Illustration 50	g01435117
View of side doors that are being installed

4. Install side doors (F) and (BE) to the machine.

5. On each side door, install two new brackets (22). On each bracket (22), install two bolts (23), four washers (24), and two nuts (25) .

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Illustration 51	g01404336
View of the front air filter frame

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Illustration 52	g01404291
View of the rear air filter frame

6. Drill four holes with a 3.6 mm (9/64 inch) drill bit in the air cleaner housing. Dimensions on the air filter frame are dependent on the alignment of the door. Double check the measurements and alignment before drilling the holes. Adjust the height of the hole in the air cleaner housing support for the rubber latch. Do not adjust the stretch.
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   Table 10

   Specifications for the Front and Rear Air Filter Frame
   J	54.4 mm (2.14 inch)
   K	38.5 mm (1.52 inch)
   L	188 mm (7.40 inch)
   M	3.6 mm (0.14 inch)
   N	555 mm (21.85 inch)
   P	240 mm (9.45 inch)

7. Install rubber straps (27) to the air filter frame with rivets (26). Secure the cup to the bracket with rivets (26) .

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Illustration 53	g01435109
View of bonnet that is being reinstalled

8. Reinstall the canister for the air filter (AZ) and reconnect the hoses.

Installation of the Film Groups

Note: The following sequence is recommended for the installation of the film groups on machines with the following serial numbers: (S/N: DFA1-327; DFJ1-351)

Table 11

Parts that are Required for the Installation of the Films for 631G Wheel Tractor-Scraper
Item	Qty	Part Number	Description
31	1	253-0861	Film
32	1	266-9903	Film
33	1	281-7268	Film
34	1	266-9899	Film

Table 12

Parts that are Required for the Installation of the Films for 637G Wheel Tractor-Scraper
Item	Qty	Part Number	Description
31	1	253-0861	Film
32	1	266-9903	Film
33	1	281-7268	Film
35	1	266-9901	Film

Illustration 54	g01439894

Illustration 55	g01439899

Distance (BK) is equal to 60 mm (2.36 inch).

Distance (BL) is equal to 95 mm (3.74 inch).