Parts Manual

THIS IS A MANUAL PRODUCED BY JENSALES INC. WITHOUT THE AUTHORIZATION OF J.I. CASE OR IT’S SUCCESSORS. J.I. CASE AND IT’S SUCCESSORS

ARE NOT RESPONSIBLE FOR THE QUALITY OR ACCURACY OF THIS MANUAL.

TRADE MARKS AND TRADE NAMES CONTAINED AND USED HEREIN ARE THOSE OF OTHERS, AND ARE USED HERE IN A DESCRIPTIVE SENSE TO REFER TO THE PRODUCTS OF OTHERS.

Parts

Man

ual

688 Crawler Excavator S/n 74123-74485 &

11501-11555 Volume 1 of 2

CA-P-688 CLREX

Lep 8-3472

688 Crawler Excavator

Parts . Catalog Lep 8-3472

This Publication Replaces Lep 8-3471

Copyright © 1990 CASE CORPORATION

Issued December, 1990 Printed in England

1-4 688 Crawler Excavator

SERIAL PRODUCT IDENTIFICATION NUMBERS LOCATIONS

ENGINE SERIAL NUMBER (Plate on timing cover at right front of engine)

PRODUCT IDENTIFICATION NUMBER (Plate on frame)

NOTE: Many major components (valves, motors, planetary transmissions) also have a serial number

for reference use.

Lep 8-3472

688 Crawler Excavator 1-7

PICTORIAL SECTION INDEX

GENERAL 1

----- ENGINE 2

FUEL 3

----- ELECTRICAL 4

STEERING 5

----- POWER TRAIN 6

BRAKES 7

----- HYDRAULICS 8

Issued December, 1990

CHASSIS/ MOUNTED 9 EQUIPMENT

NUMERICAL 1 0 INDEX

Printed in England

REF.

688 Crawler Excavator

PICTORIAL INDEX

HYDRAULIC SYSTEM

DESCRIPTION

1-9

PAGE

1 Charge Suction Line. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 8-17. 8-19 2 Pressure Check .................................................. 8-27. 8-29 3 Swing Control Valve Pressure Hose. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 8-31. 8-33 4 Pilot and Leak Return Tubes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 8-31. 8-33 5 Oil Cooler Return Hose to Reservoir ................................. 8-17. 8-19 6 Oil Cooler Return Hose ............................................ 8-17. 8-19 7 Leak Return Tube. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 8-69. 8-71 8 Hose Return at Oil Cooler. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 8-17 - 8-21

Lep 8-6042 Issued September. 1990 Printed in England

REF.

688 Crawler Excavator

PICTORIAL INDEX HYDRAULIC SYSTEM

DESCRIPTION

1-11

PAGE

1 Hose, Control Circuit .......................•..................... 8-99, 8-101 2 Pressure Check ................................................. 8-99, 8-101 3 Hose, Control Circuit ................................................... 8-103 4 Hose, Control Circuit ................................................... 8-105 5 Hose, Foot Pump Control Circuit ........................................ 8-105 6 Tube, Control ....................•.............................. 8-73, 8-75 7 Hose, Swing ...............................................•........... 8-77 8 Tube, Control Circuit .................................................... 8-77

Lep 8-6042 Issued September, 1990 Printed in England