785D OEM Off-Highway Truck Machine Systems Caterpillar

Center Arm (Steering) - Remove and Install

Usage:

785D DMC

Removal Procedure

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Table 1
Required Tools
Tool	Part Number	Part Description	Qty
A	4C-3386	Spanner Wrench	1
B	5S-6084	Socket (3 1/2 inch)	1
	478-3993	Hydraulic Torque Wrench	1
	385-3995	Hydraulic Pump Gp	1
	384-8916⁽¹⁾	Hydraulic Pump Gp	1
C	231-4904	Wedge	1
D	1U-7505	Transmission Jack	1
D	485-8004	Support Stand	1
E	1U-9749	Transmission Jack	1
F	1P-1837	Bearing Puller Adapter	1
	5P-4184	Stud	1
	6V-3170	Cylinder Group	1
	9U-6600	Hand Hydraulic Pump	1
	7H-7539	Nut (1 1/4 inch - 12NF)	1
G	-	Retaining Ring Pliers	1

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⁽¹⁾	Available Substitute

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NOTICE

Keep all parts clean from contaminants. Contaminants may cause rapid wear and shortened component life.

Note: Put identification marks on all hose assemblies and on all tube assemblies for installation purposes. Plug all hose assemblies and all tube assemblies. This helps to prevent fluid loss and this helps to prevent contaminants from entering the system.

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Illustration 1	g01591531

Disconnect grease hose assemblies (1).
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Illustration 2 g01591535
Disconnect grease hose assemblies (2).
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Illustration 3 g01591556
Use Tooling (G) to remove retaining rings (3) and (5). Remove retaining ring (3) and plug (4). Remove retaining ring (5) and plug (6).
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Illustration 4 g01591576

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Illustration 5 g01591654
Use Tooling (A) to retain ball stud (7). Use Tooling (B) to loosen locknut (8).
Note: Do not remove locknut (8) completely from ball stud (7).
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Illustration 6 g01591734
Use Tooling (C) to drive ball stud (7) out of the taper. Remove locknut (8). Separate steering link (9) from center arm (10).
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Illustration 7 g01591773
Use Tooling (D) to support steering link (9). The weight of steering link (9) is approximately 115 kg (253 lb).
Secure steering link (9) out of the way. Remove Tooling (D).
Repeat Steps 4 and 7 for the remaining ball stud.
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Illustration 8 g01591800

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Illustration 9 g01591893
Use Tooling (E) to support center arm (10). The weight of center arm (10) is approximately 90 kg (198 lb).
Remove bolts (11) and lock (12). Lower pin (13) onto plate (14). Remove plate (14) to remove pin (13).
Remove center arm (10).
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Illustration 10 g01591913
Remove shims (15).
Note: Note the order and the quantity of shims (15) for installation purposes.
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Illustration 11 g01591935
Use Tooling (F) to remove bearing (16) from the frame assembly.
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Illustration 12 g01591953
Use Tooling (F) to remove bearing (17) from the frame assembly.

Installation Procedure

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Table 2
Required Tools
Tool	Part Number	Part Description	Qty
A	4C-3386	Spanner Wrench	1
B	5S-6084	Socket (3 1/2 inch)	1
	478-3993	Hydraulic Torque Wrench	1
	385-3995	Hydraulic Pump Gp	1
	384-8916⁽¹⁾	Hydraulic Pump Gp	1
C	231-4904	Wedge	1
D	1U-7505	Transmission Jack	1
D	485-8004	Support Stand	1
E	1U-9749	Transmission Jack	1
F	1P-1837	Bearing Puller Adapter	1
	5P-4184	Stud	1
	6V-3170	Cylinder Group	1
	9U-6600	Hand Hydraulic Pump	1
	7H-7539	Nut (1 1/4 inch - 12NF)	1
H	4C-5592	Anti-Seize Compound	1

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⁽¹⁾	Available Substitute

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NOTICE

Keep all parts clean from contaminants. Contaminants may cause rapid wear and shortened component life.

Note: Inspect the O-ring seals. Replace the O-ring seals that are worn or damaged.

Note: Lubricate all the O-ring seals lightly with the lubricant that is being sealed.

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Illustration 13	g01591953

Lower the temperature of bearing (17). Use Tooling (F) to install bearing (17) into the frame assembly.
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Illustration 14 g01591935
Lower the temperature of bearing (16). Use Tooling (F) to install bearing (16) into the frame assembly.
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Illustration 15 g01591800

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Illustration 16 g01592036
Use Tooling (E) to position center arm (10). The weight of center arm (10) is approximately 90 kg (198 lb).
Measure the distance between the top of center arm (10) and the bottom of the frame. Install several shims (15) that provides a gap of 0.7 ± 0.6 mm (0.03 ± 0.02 inch).
Install pin (13). Install plate (14). Install lock (12) and bolts (11).
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Illustration 17 g01591773
Apply Tooling (H) onto the ball stud. Use Tooling (D) to install steering link (9). The weight of steering link (9) is approximately 115 kg (253 lb). Remove Tooling (D).
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Illustration 18 g01591576

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Illustration 19 g01591654
Apply Tooling (H) onto the face of locknut (8). Install locknut (8). Use Tooling (A) to retain ball stud (7). Use Tooling (B) to tighten locknut (8). Tighten locknut (8) to a torque of 2060 ± 100 N·m (1519 ± 74 lb ft).
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Illustration 20 g01591556
Use Tooling (G) to install retaining rings (5) and (3). Install plug (6) and retaining ring (5). Install plug (4) and retaining ring (3).
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Illustration 21 g01591535
Connect grease hose assemblies (2).
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Illustration 22 g01591531
Connect grease hose assemblies (1).
Check the alignment of the front wheels. Refer to Steering Systems Operation/Testing and Adjusting, "Front Wheel - Align".