This collection contains the following 4 manuals:

Komatsu PC55MR-3 & PC45MR-3 shop manual
Komatsu PC55MR-3 Operation and maintenance manual
Komatsu PC55MR-3 parts manual
Komatsu 68E thru 88E engine service manual (Yanmar 4D88E-6BPDB)

Manual descriptions as follows.

Komatsu PC45MR-3 PC55MR-3 Operation and maintenance manual.
Pages 287
Model and serial number range
PC45MR-3 6243 and up
PC55MR-3 16609 and up
This operation and maintenance manual provides essential
information with regard to the operation and maintenance
of this machine. Careful handling, correct periodical
inspections and maintenance. This manual should always
be present with machine.

Komatsu PC55MR-3 and PC45MR-3 shop manual.
Model and serial number range.
PC55MR-3 15001 and up.
PC45MR-3 5001 and up.
This is a high quality factory PDF.
Pages 572
This factory service manual has easy-to-read text sections
with top quality diagrams, pictures and illustrations. The
step by step instructions show you how to fault find or
complete any repair or overhaul, correctly and efficiently,
saving time and avoiding cockups. All specifications and
tolerances are listed. Functions of components and systems
are also explained.

Komatsu PC55MR-3 parts manual. s/n 15001-up
Pages 860.
This is a fully illustrated parts list with exploded views.
It can be a very helpful tool to assist your mechanic with disassembly and assembly

Komatsu 68E-88E series engine service https://www.tradebit.coms is a high quality manual. 212 Pages.
This manual covers following model engines.
2D68E
3D68E
3D74E
3D78AE
3D82AE
3D82E
3D84E
3D88E
4D82E
4D84E
4D88E
S3D84E
S4D84E

Contents of manual

https://www.tradebit.comCIFICATIONS AND PERFORMANCE
https://www.tradebit.comSS SECTIONAL VIEWS
https://www.tradebit.comLING WATER, LUBRICATING OIL AND FUEL OIL
https://www.tradebit.comUBLESHOOTING
https://www.tradebit.comCIAL SERVICE TOOLS AND MEASURING INSTRUMENTS
https://www.tradebit.comSUREMENT, INSPECTION AND ADJUSTMENT
https://www.tradebit.comSURING PROCEDURES, SERVICE DATA AND CORRECTIVE ACTION
https://www.tradebit.comASSEMBLY AND REASSEMBLY
https://www.tradebit.comVICE DATA
https://www.tradebit.comHTENING TORQUE
https://www.tradebit.comL INJECTION PUMP FOR INDIRECT INJECTION SYSTEM
https://www.tradebit.comL INJECTION PUMP FOR DIRECT INJECTION SYSTEM
https://www.tradebit.comERNOR
https://www.tradebit.comRBOCHARGER
https://www.tradebit.comVICE INFORMATION FOR CARB ULG REGULATION
https://www.tradebit.comACHED DRAWING
EPA CERTIFIED ENGINE