This collection contains the following 3 manuals

Komatsu 68E-88E series engine service manual. This manual covers following models.
2D68E,3D68E,3D74E,3D78AE,3D62AE,3D82E,3D84E,3D88E,4D84E,4D82E,4D88E,S3D84E,S4D84E.
This is a high quality workshop manual which covers all aspects of engine rebuilding.212 pages.
The PC20R-8 uses 3D74E-3
The PC25R-8 and PC27R-8 both use 3D82E-3 engine

Komatsu PC20R-8,PC25R-8,PC27R-8 shop manual. This is a quality manual, 473 pages.
Model and serial number ranges
PC20R-8 10001 and up
PC25R-8 10001 and up
PC27R-8 10001 and up
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 costly mistakes. All specifications
and tolerances are listed. Functions of components and
systems are also explained.

Komatsu PC27R-8 operation and maintenance manual. This quality manual has 209 pages .
SERIAL NUMBERS PC27R-8 F31103 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.