Usage:
November 1, 2002
U-284
A-195
AU-209
S-208
H-206
O-232
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PRODUCT SUPPORT PROGRAM FOR ADDING STOPS TO THE BLADE TO PREVENT ANGLE CYLINDER FAILURES ON CERTAIN D6M TRACTORS |
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PS50512
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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.
TERMINATION DATE
November 30, 2004PROBLEM
Stops need to be added to the blade to prevent angle cylinder failures on certain D6M Tractors. Angle cylinder breaking can occur, due to stack up tolerances and due to high corner blade loading application, the 1J2175 Bolt which hold the cylinder piston to the rod can either breaks or be loose carrying out to an angle cylinder failure.AFFECTED PRODUCT
| Model | Identification Number |
| D6M | 9ZM1-Up
2RN1-Up 3WN1-Up 4JN1-Up 5NR1-Up 5WR1-Up 6LR1-Up
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| D6M XL | 2YS1-Up |
| D6M LGP | 4GS1-Up |
PARTS NEEDED
2 - 2004163 Plate Assembly1 - 2056194 Stop Assembly - RH
1 - 2056195 Stop Assembly - LH
ACTION REQUIRED
Add stops on rear of the blade and on C-frame structure. This will add 100 kg on front of tractor and minimizes the angling capability by some degrees. This rework will prevent repetitive failures. See the attached Rework Procedure.SERVICE CLAIM ALLOWANCES
Product smu/age whichever comes first |
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84-96 months |
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PARTS DISPOSITION
Handle the parts in accordance with your Warranty Bulletin on warranty parts handling.Attach. (1-Rework Procedure)
Rework Procedure
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Miscellaneous hardware:
One portable welding equipment
One portable grinding machine
Two clamps
One steel or wooden log able to support dozer
with C-Frame in horizontal position
One small manual lifting jack (lift blade
stops # 25 kg)
Two small tacking parts (15 mm thick)
Steel strips (total length around 1 meter ? width around 50 mm ? thickness around 8 mm)
Estimated duration
One person
6 hours
Procedure
1. Dozer positioning
Lift the dozer and lay it on the log.
The log must be positioned right under the C-Frame tower and the C-Frame must be almost horizontal when in position.
Angle the blade at maximum in order to make one of the work areas accessible.
2. C-Frame Stop positioning
When aligning the bottom line of the stops
15-mm above the bottom of the C-Frame, the stop is fully constrained.
Grind the paint of the C-Frame around the perimeter of the stop.
Weld the two tacking parts down on the front
of the frame so that, once resting on these parts, the stop is positioned
15 mm above the bottom of the frame.
3. C-Frame Stop tacking
Press the front area of the stop against the frame with a clamp and tack it.
Due to fabrication tolerances, the rear part of the stop may then go away from the frame by several millimeters. Using clamps, press it against the frame and tack the stop.
4. Weld the C-Frame stop
Remove the two tacking parts and weld the stop
all around the perimeter with as few stops as possible.
5. Blade stops positioning
Grind
the paint of the blade around the perimeter of the stop. The edge of the
stop will be at 175 mm from the edge of the double plate of the angle cylinder
bracket.
Weld two strips on the bottom face of the blade. Those strips will support the stop during the welding operations. Grind them
so that the stop can slide between the blade and the strips.
With two small strips welded together, make a fixture tool that will clamp the 15-mm thick plate of the stop against the structure of the blade. Weld it far enough from the center of the blade so that the stop can slide to its nominal position.
Use the lifting jack to push and adjust the
stop up against the back of the blade.
6. Blade stops welding
Tack weld the stop and then weld it with as few stops as possible. Remove the taking strips.
7. Other side and painting
Once the operation is done on one side, angle
the blade on the other side and repeat the operation.
