Loader Arm Issues {6118, 6119} Caterpillar

Backhoe Loader

416E (S/N: MFG1-UP)

Introduction

The problem that is identified below does not have a known permanent solution. Until a permanent solution is known, use the solution that is identified below.

Problem

The Lift Arm on 416E Backhoe Loaders Built in Brazil May Have Some Operational and Aesthetic Problems During Normal Operation

Operational

• Lift arm torsion

• Retaining ring to come out of the groove

Aesthetic

• Bucket not sitting level

• Clearance wear bars on the lift arm and wear bars on the radiator guard

Solution

Operational

Lift arm torsion ( (S/N: MFG1-11033))

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Illustration 1	g06011291
Pin bore identification

1. Identify pin bores

1. Check tower dimensions according to Special Instruction, REHS0142, "Rebuilding the Backhoe Loader Pin Bores". Identify which bores is out of alignment and rework as necessary. Refer to Illustration 1.

   Note: To check Y-pin bores alignment between the 2 tubes, use a portable coordinate measuring machine or a go/no-go gauge.

   Note: Brazilian dealers reworked (machined) the A-pin bore solving the issue, even if the Y-pin bore was identified as out of alignment.

   Note: The E-series backhoe loader is not listed in Special Instruction, REHS0142, "Rebuilding the Backhoe Loader Pin Bores" but the loader arm and tower dimensions are the same.

Retaining Ring to Come Out of The Groove ( (S/N: MFG11034-UP))

Reminder

Illustration 2	g06009246
Location of grease point

Grease point under the cowl / behind brake reservoir (S/N: MFG1-UP). Refer to Illustration 2.

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Illustration 3	g06009187
Area to be machined

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Illustration 4	g06009163
(A) Area to be machined (B) Boss (C) Shim (D) Chassis

1. Machine internal/external boss surfaces until the A-pin groove is aligned with the boss surface, correcting any perpendicularity issue with A-pin it will increase ring retention due to better surface settlement between ring and boss. Refer to Illustrations 3and 4.

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Illustration 5	g01253154

1. Refer to the disassembly and assembly module for your machine. Support the lift arms with a suitable lifting device. Remove the washers (1) and the retaining ring (2). Note the location of washers to aid in installation. Remove the pin from the lift arms.

2. Drill a hole and tap a hole into each end of the pin. The depth of the holes should be 55 mm (2.2 inch). The threads should be M16 X 2.
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   Illustration 6	g01252823

3. Fabricate two plates from steel. The steel must meet the following specifications: ASTM A513, ASTM A519, ASTM A572, ASTM A656, ASTM A808, ASTM A1011, and ASTM A1018

   Fabricate the plates to the following dimensions.

   • (A) 9.3 ± 0.5 mm (0.37 ± 0.02 inch)

   • (B) 25.4 ± 0.5 mm (1.00 ± 0.02 inch)

   • (C) Diameter of 97.8 ± 0.5 mm (3.85 ± 0.02 inch)

   • (D) Diameter of 71.1 ± 0.5 mm (2.80 ± 0.02 inch)

   • (E) Diameter of 18.0 ± 0.5 mm (0.71 ± 0.02 inch)
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   Illustration 7	g01252844

4. Install the pin. Install the washers (1) and install the retaining rings (2).
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   Illustration 8	g01252846

5. Install the plates on each end of the pin. Use one 9X-8257 Washer (3) and one 8T-4193 Bolt (4) to hold each plate in place.

Aesthetic

Bucket not sitting level

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Illustration 9	g06009282
(A) 19 mm (0.75 inch)

1. Due to stack up tolerances when you lower the loader arms and rest the bucket on the concrete floor, the bucket can actually be off by as much as 19 mm (0.75 inch) from one side of the cutting edge to the other. Refer to Illustration 9.

   Note: There is no need for rework at this case

Clearance wear bars on the lift arm and wear bars on the radiator guard (S/N: MFG1-9590)

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Illustration 10	g06009326
(B) Lift arm wear bar (C) Radiator guard wear bar (D) Right-hand side (E) Left-hand side (F) minimum of 10 mm (0.39 inch)

1. Check the clearance between the wear bar on the Lift arm wear bar (B) and Radiator guard wear bar (C) on the radiator guard, should be at least 10 mm (0.39 inch) on each side.

   Check the difference between the clearances from Right-hand side (D) to Left-hand side (E) (D-E = 6 mm (0.24 inch)). The value should be within 6 mm (0.24 inch). Refer to Illustration 10.

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   Illustration 11	g06009348

2. If necessary, use shims to provide the clearance between the wear bar on the lift arm and wear bar on the radiator guard (Minimum 10 mm (0.39 inch)). The difference between the clearances from Left-hand/.Right-hand should be within 6 mm (0.24 inch).

   Note: A minimum of one 128-7905 Spaceris required between loader arm and tower on both sides