OPERATOR AR 3414963 - Caterpillar

PARTS NEEDED
Qty
Part Number Description
6 8T0372 BOLT
18 3101945 STUD-TAPERLOCK
ACTION REQUIRED
See attached rework procedure.
OWNER NOTIFICATION
U.S. and Canadian owners will receive the attached Owner Notification.
SERVICE CLAIM ALLOWANCES
Caterpillar Dealer Suggested Customer Suggested
Parts % Labor Hrs% Parts % Labor Hrs% Parts % Labor Hrs%
100% 100% 0% 0% 0% 0%
This is a 24.0-hour job
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.
COPY OF OWNER NOTIFICATION FOR U.S. AND CANADIAN OWNERS
XYZ Corporation
3240 Arrow Drive
Anywhere, YZ 99999
PRIORITY - PRODUCT IMPROVEMENT PROGRAM FOR REWORKING 238-6841 AND 239-1266 SERVICE BRAKE GROUPS ON CERTAIN 770 AND 772 OFF-HIGHWAY TRUCKS
MODELS INVOLVED - 770-772 Off-Highway Trucks
Dear Caterpillar Product Owner:
The 238-6842 Brake Anchor (770) or 239-1267 Brake Anchor (772) as well as the 238-6846 Plate need to be reworked on the products listed. The existing brake anchor studs can fail as the parking brake is released which will not allow the release of the parking brake. You will not be charged for the service performed.
Contact your local Caterpillar dealer immediately to schedule this service. The dealer will advise you of the time required to complete this service.
Please refer the dealer to their Service Letter dated 24Oct2007 when scheduling this service.
We regret the inconvenience this may cause you, but urge you to have this service performed as soon as possible to prevent unscheduled downtime.
Caterpillar Inc.
Identification #(s)
Attached to 24Oct2007 Service Letter
Rework Procedure
Each of the (3) tapped holes and (9) taper lock tapped holes affected by this publication are identified in the 238-6841 and 239-1266 brake group illustration below. Eight (8) holes identified as (A) and (C) must be reworked to the specified depths before re-assembly. The resultant installed stud height should be the same as the previous design.
Marked (A) - 3 holes Drill 10.5 ? A ( to 51mm depth)
Tap M12 x 1.75 H ( to 42.8mm depth)
Drill 13.8 ? B (to 25mm depth)
Marked (B) - 4 holes No Rework required
10.5-A (25mm depth)
M12 x 1.75 6H taperlock (15mm depth)
Marked (C) - 5 holes Drill 10.5-A (to 33mm depth)
Tap M12 x 1.75 6H taperlock (to 23mm depth)
(See attached image)
During assembly, tighten nuts (B) in a crisscross pattern to 100 Nm and insure the piston housing is seated against the anchor.
Tighten the (8) bolts to 100 Nm in a crisscross pattern.
Retighten the nuts (B) in a crisscross pattern to 100+/-20 Nm.
Retighten the (8) bolts in a crisscross pattern to 100+/-20 Nm.
Image1.1.1