The Truck Body Canopy May Crack on Certain 777D, 777F, and 777G Off-Highway Trucks{7250, 7258, 7302} Caterpillar

Off-Highway Truck:

777D (S/N: FKR1-UP)

777F (S/N: JRP1-UP)

777G (S/N: TNM1-UP; RDR1-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

Illustration 1	g03739506
(A) Stringer plate (B) C-channel

Illustration 2	g03739507
View C

Illustration 3	g03739508
View D

The following problem is only applicable to the machines listed above that are equipped with one of the following X-Body arrangements: 327-0400 Body and Canopy As , 363-5111 Truck Body Option Ar , 363-5112 Truck Body Option Ar or 363-5113 Truck Body Option Ar .

The canopy can develop a crack where stringer plate (A) and C channel (B) meets at location shown in Illustration 2 and Illustration 3. The crack shown in Illustration 2 can develop on either side of the C channel. The cracks may be observed in several locations along the length of the C channel.

Solution

Caterpillar is aware of this problem, recommending removal of crack, and reweld affected area using applicable general weld procedures. Refer Special Instruction, REHS1841, "General Welding Procedures".

Regardless in the event of a failure, observed cracks or no cracks, record the information as requested below in the ""Machine Observation Report" " and send information to:

Note: Respond by 1December 2014

Machine Observation Report

Machine Information

Machine Serial No: RDR _______, TNM _______, FKR _______, JRP _______

Machine Hours: __________

Body Information

Body Serial No: FHA _______

Is the canopy cracked (Circle one): Yes or No

Hours on machine when cracks first observed: _______

Have the cracks been repaired (circle one): Yes or No

Have the cracks reoccurred (circle one):Yes or No

Application

Type of application (circle one): Mining, Quarry, Construction.

Material being mined _____________

Haul Road Conditions (circle one): Good, Average, Poor.

Operation

Days/Week _______

Hours/Shift _______

Number of Shifts _______