PRODUCT IMPROVEMENT PROGRAM FOR ADJUSTING THE SWING GEAR ON CERTAIN 301.7D CR MINI HYDRAULIC EXCAVATORS Caterpillar

PRODUCT IMPROVEMENT PROGRAM FOR ADJUSTING THE SWING GEAR ON CERTAIN 301.7D CR MINI HYDRAULIC EXCAVATORS

Usage:

TEBE5320-02

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21Oct2016

(Revised 10May2017)

D-473

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Priority	PRODUCT IMPROVEMENT PROGRAM FOR ADJUSTING THE SWING GEAR ON CERTAIN 301.7D CR MINI HYDRAULIC EXCAVATORS
5058 7050 6506		PI32693

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NOTE:

Caterpillar’s obligations under this Service Letter are subject to, and shall not apply in contravention of, the laws, rules, regulations, directives, ordinances, orders, or statutes of the United States, or of any other applicable jurisdiction, without recourse or liability with respect to Caterpillar.

NOTE:

This Program must be administered as soon as possible. When reporting the repair, use "PI32693" as the Part Number and "7751" as the Group Number, "56" as the Warranty Claim Description Code and "T" as the SIMS Description code. Exception: If the repair is done after failure, use "PI32693" as the Part Number, "7751" as the Group Number, "96" as the Warranty Claim Description Code, and "Z" as the SIMS Description Code.

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NOTE:

The information supplied in this service letter may not be valid after the termination date of this program. Do not perform the work outlined in this Service Letter after the termination date without first contacting your Caterpillar product analyst.

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NOTE:	This Revised Service Letter replaces the 21Oct2016 (Revised 15Feb2017) Service Letter. Changes have been made to the Rework Procedure, Step 2A, bolt part number.

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COMPLETION DATE	TERMINATION DATE
30Apr2017	31Oct2017

PROBLEM

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The swing gear needs to be adjusted on certain 301.7D CR Mini Hydraulic Excavators. The existing swing gear and swing motor pinion teeth can be damaged or broken.

AFFECTED PRODUCT

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Model	Identification Number
301.7D CR	LJD00903, 906, 908-916, 918, 930-933, 935-939, 958-960

PARTS NEEDED

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Qty	Part Number	Description
1	3792852	MOTOR-SWING (After Failure Only)
1	4342967	GEAR-SWING (After Failure Only)
In order to allow equitable parts availability to all participating dealers, please limit your initial parts order to not exceed 36% of dealership population. This is an initial order recommendation only, and the ultimate responsibility for ordering the total number of parts needed to satisfy the program lies with the dealer.

ACTION REQUIRED

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Refer to the attached Rework Procedure.

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OWNER NOTIFICATION

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Owners in the following countries will receive the attached Owner Notification:
US
Canada

SERVICE CLAIM ALLOWANCES

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Caterpillar		Dealer Suggested		Customer Suggested
Parts %	Labor Hrs%	Parts %	Labor Hrs%	Parts %	Labor Hrs%
100%	100%	0%	0%	0%	0%

NOTE: This is a 1.0-hour job
Before Failure: This is a 1.0 hour job to adjust the existing swing gear backlash. After Failure: An additional 10.0 hours is allowed for a total of 11.0 hours to replace the swing motor and bearing and adjust the gear backlash.

PARTS DISPOSITION

Handle the parts in accordance with your Warranty Bulletin on warranty parts handling.

MAKE EVERY EFFORT TO COMPLETE THIS PROGRAM AS SOON AS POSSIBLE.

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EXAMPLE COPY OF OWNER NOTIFICATION

XYZ Corporation
3240 Arrow Drive
Anywhere, YZ 99999

PRIORITY - PRODUCT IMPROVEMENT PROGRAM FOR ADJUSTING THE SWING GEAR

MODELS INVOLVED - CERTAIN 301.7D CR MINI HYDRAULIC EXCAVATORS

Dear Cat Product Owner:

The swing gear needs to be adjusted on the products listed below. The existing swing gear teeth or swing motor pinion teeth can be damaged or broken. You will not be charged for the service performed.

Contact your local Cat dealer immediately to schedule this service. The dealer will advise you of the time required to complete this service.

If you are no longer the owner of this product(s), please contact your local Cat dealer so that our records can be updated. Please refer the dealer to their Service Letter dated 21Oct2016 when scheduling this service.

We regret the inconvenience this may cause you, and urge you to have this service performed as soon as possible to prevent unscheduled downtime.

Caterpillar Inc.

Identification #(s)

Attached to 21Oct2016 Service Letter

Rework Procedure

Note: Ensure that all safety information, warnings, and instructions are read and understood before any operation or any maintenance procedures are performed. Refer to the Operation and Maintenance Manual "Safety Section".

Refer to the Service Manual if/as necessary.

Preparation of the Machine for Rework:

- Park the machine on level ground in an open location where the upper frame can be rotated in a complete circle with the boom and stick extended. Extend the tracks. Place the blade on the ground and secure the machine from rolling.

- Remove the work tool and retract the bucket cylinder. Use the swing cylinder to center the boom to the middle of the machine. Extend the stick and lower the boom over the blade until the work tool end of the stick is just above the ground but not touching the ground.

- Stop the engine.

1. Measure the swing gear clearance.

1A. Place a tape measure under the work tool end of the stick and note the location of each side of the stick. Refer to Image1.3.1.

Image1.3.1

1B. Use a force gauge to apply 7kg +/- 0.5kg force to one side of the stick. Measure and record the distance of movement at the end of the stick. Refer to Image1.4.1.

Image1.4.1

1C. Use a force gauge to apply 7kg +/- 0.5kg force to the other side of the stick. Measure and record the distance of movement at the end of the stick. Refer to Image1.5.1.

Image1.5.1

1D. Rotate the upper frame 90 degrees so that the boom and stick extend over one track and repeat Steps 1A through 1C.

1E. Rotate the upper frame 90 degrees so that the boom and stick extend to the rear of the undercarriage and repeat Steps 1A through 1C.

1F. Rotate the upper frame 90 degrees so that the boom and stick extend over the other track and repeat Steps 1A through 1C.

Evaluate the Measurements:

The stick should move between 30mm and 45mm in each location.

- If the measurements in Step 1 are not between 30mm and 45mm then adjust the swing gear as instructed in Step 2 below.

- If the measurements taken in Step 1 are between 30mm and 45mm then no further action is needed.

2. Adjust the swing gear.

2A. Loosen the outer 438-5838 Bolts (in 438-5837 Frame Group) that secure the ring gear to the upper frame until there is a 2mm gap between the washer and the gear. Refer to Image1.8.1.

Image1.8.1

2B. Keeping the boom and stick extended, using the swing motor, rotate the upper frame two complete turns to the right then two turns to the left to release assembly stress and optimize the meshing of the ring gear and swing motor pinion. Then retract the boom and the stick.

2C. Gently tighten one bolt on each side until there is no gap between the washer and the upper frame. Then gently tighten one bolt on the front and one in the rear of the machine. Gently tighten the rest of the bolts in the same diagonal pattern to ensure and even gear mesh.

2D. Use the same tightening pattern in Step 2C to tighten each bolt to a specified torque of 125 N.m.

Note: Place a paint mark on each subsequent bolt after applying the final torque to ensure successful completion of all bolts. Confirm that all 17 outer race bolts are installed and torqued.