794 AC Off-Highway Truck Field Assembly Caterpillar

Front Axle - Install

Usage:

Parts and Specification Information

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Illustration 1	g03841470

Note: Verify that all parts are shipped and undamaged for preparation of assembly. missing or damaged parts can be ordered prior to assembly to avoid delays during assembly.

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Observe the safe working load limits of all lifting and blocking devices and keep a safe distance from suspended/blocked loads. Personnel may be seriously injured or killed by falling loads.

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Personal injury or death can occur from heavy components falling during removal or installation.

Properly support the component with a suitable lifting device during removal or installation.

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Climbing equipment may be required to access this service point. Refer to the Operation and Maintenance Manual, "Mounting and Dismounting"
topic for safety information.

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Table 1
Item	Part Number	Description	Qty	Specification	Approximate Weight
1	431-5790	Pin	2	Coat spherical and bore surfaces of bearings with 4C-5599 Anti-Seize Compound before installing pins	34 kg (75 lb)
2	431-5791	Retainer	2
3	5P-2566	Bolt	8	Apply 420-5249 Sealant
4	8T-4223	Hard Washer	8
5	432-7860	Ring	8
6	431-5787	Eccentric Pin	2	Coat spherical and bore surfaces of bearings with 4C-5599 Anti-Seize Compound before installing pins	18 kg (40 lb)
7	431-5789	Pin Retainer	2
8	431-5786	Pin	1	Coat spherical and bore surfaces of bearings with 4C-5599 Anti-Seize Compound before installing pins	19 kg (43 lb)

Installation Procedure

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Illustration 2	g03841672
View of the lifting point on the front of the frame

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Illustration 3	g03841696
View of the lifting points on the rear of the frame

Use two suitable cranes to lift the main frame at the four lifting points indicated in Illustrations 2 and 3. The main frame weighs approximately 55338 kg (122000 lb).
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Illustration 4 g03841703

View of the frame positioned above the front axle
Slowly position the main frame above the front axle.
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Illustration 5 g03841711

View of the frame positioned above the front axle
Use the adjustable lifting devices to adjust the height of the front axle rods. Position the rods so the rods line up with the front axle mounting points.
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Illustration 6 g03841764

View of the right side front axle rods
Install the lower front axle rod to the front axle using one pin (1), one retainer (2), two bolts (3), two hard washers (4), and two rings (5) on each side.
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Illustration 7 g03841885

View of the front axle rods
Remove the retainer bar hardware from the left side upper rod eccentric pin at the frame. Install the upper rod to the front axle with one eccentric pin (6). Rotate eccentric pin (6) and the eccentric pin on the frame to position the slot vertical and the eccentric portion of the pin up.
Rotate the retainer bar hardware from the right side upper rod eccentric pin at the frame. Rotate the right upper eccentric pin to position the slot vertical and the eccentric portion of the pin up.
Rotate the three installed eccentric pins until the upper right side axle pin bores line up to allow installation of the last eccentric pin (6) on the right side of the machine at the front axle.
Secure the eccentric pins in place with a pin retainer (7), two bolts (3), two hard washers (4), and two rings (5).
Repeat Steps 4 through 8 for both sides of the machine.
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Illustration 8 g03841977

View of the right side front suspension
Secure the front axle to the right side of the frame using one pin (8), one pin retainer (7), two bolts (3), and two hard washers (4). Install two rings (5) on pin (8).
Connect the front axle to the front suspension cylinders using one pin (1), one retainer (2), two bolts (3), and two hard washers (4) on each side. Install two rings (5) on each pin (1).
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Illustration 9 g03842063

View of the frame and front axle being positioned on stands
Depending on the site layout and assembly conditions either use blocking or stands to support the main frame with the front axle or use stands to support the main frame. Refer to Illustration 9 for a typical example of using stands to support the main frame. Position the stands under the front axle rod mounting points, and under the hoist cylinders. If blocking is used, block the hoist cylinder mounts at a height where the rear axle may be positioned under the main frame.
Note: 794 AC machines are typically assembled using blocking.