23413-ZW4-E50 Honda GEAR C, PRIMARY DRIVE (28T) (Honda Code 4799896). (YELLOW)

Introduction
This Special Instruction provides the procedure to rework the 342-7800 Scavenge Pump to eliminate potential for misalignment during assembly on certain Off-Highway Truck engines.Do not perform any procedure in this Special Instruction until you have read the information and you understand the information.Note: The rework is not intended to be a field fit, the rework is intended to be completed at a Component Repair Center (CRC) during an engine or component rebuild.Important Safety Information
Work safely. Most accidents that involve product operation, maintenance, and repair are caused by failure to observe basic safety rules or precautions. An accident can often be avoided by recognizing potentially hazardous situations before an accident occurs. A person must be alert to potential hazards. This person should also have the necessary training, skills, and tools to perform these functions properly.Safety precautions and warnings are provided in this instruction and on the product. If these hazard warnings are not heeded, bodily injury or death could occur to you or to other persons. Caterpillar cannot anticipate every possible circumstance that might involve a potential hazard. Therefore, the warnings in this publication and the warnings that are on the product are not all inclusive.Ensure that all personnel are safe when using a tool, procedure, work method, or operating technique not recommended by Caterpillar. Ensure that the product will not be damaged or the product made unsafe by the operation, lubrication, maintenance, or the repair procedures that are used.
Do not operate or work on this product unless you have read and understood the instruction and warnings in the relevant Operation and Maintenance Manuals and relevant service literature. Failure to follow the instructions or heed the warnings could result in injury or death. Proper care is your responsibility.
Personal injury or death can result from improper maintenance procedures. To avoid injury or death, follow the procedures exactly as stated below.
Personal injury can result from improper handling of chemicals.Make sure you use all the necessary protective equipment required to do the job.Make sure that you read and understand all directions and hazards described on the labels and material safety data sheet of any chemical that is used.Observe all safety precautions recommended by the chemical manufacturer for handling, storage, and disposal of chemicals.
Reference Section
Reference: Disassembly and Assembly, KENR6052, "Engine Oil Scavenge Pump - Assemble" for pump assembly procedure.Required Parts
Table 1
Qty Part Number Description
4 533-5073 Shim
4 244-2331 Washer
4 7X-3319 Hex Socket Screw
2 160-8750 Bolt
1 20R-7833 Scavenge Pump
2 275-2200 Bolt
4 319-3527 Hard Washer
1 331-8555 Gasket
1 391-7219 Face Seal
1 391-7220 Face Seal
1 391-7223 Face Seal Rework Procedure
Perform the following instruction for oil scavenge pump rework.
Illustration 1 g06265807
(A) 96.84 0.1 mm (3.813 0.004 inch)
(B) 3.4 mm (0.13 inch)
Note: Dimension (A) to the shaft centerline with tolerance is the critical dimension to maintain the desired gear mesh.Note: The gears back lash should be 0.257 to .597 mm (0.010 to 0.024 inch).
Illustration 2 g06267240
(E) 248 mm (9.764 inch)
(F) 269.6 mm (10.614 inch)
(G) 88.84 mm (3.498 inch)
(H) 88.84 mm (3.498 inch)
Illustration 3 g06296032
(J) 45 Degrees
(K) 1.0 to 2.0 mm (0.04 to 0.08 inch)
Illustration 4 g06296051
(L) 130.76 mm (5.148 inch)
(M) 15 mm (0.6 inch)
(N)