Case 788 988 788 988 Plus Wheeled Excavators Official Workshop Service Repair Manual
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This is the COMPLETE Official Service Repair Manual for the Case 788 988 788 988 Plus Wheeled Excavators.
This manual contains deep information about maintaining, assembly, disassembly and servicing your Tractor Wheeled Excavators.
This PDF file is Bookmarked and SEARCHABLE to make what you need easy to find.
which give you complete step by step operations on repair, servicing, technical maintenance & troubleshooting procedures for your machine.
this manual offers full information you need for repair your machine.
the information in this manual will enable you to find trouble and to understand how to repair and maintain your machine without going into service.
all pages are printable, so run off what you need and take it with you into the garage or workshop.
Models & Serials Covered:
7-79416
788/988 – 788/988 Plus Crawler Excavators
788/988 – 788/988 Plus Wheeled Excavators
Table of Contents:
1 GENERAL INFORMATION
Safety, general and torque settings ………………………………………………………..1001
Specifications (Crawler excavators)………………………………………………………..1002
Specifications (Wheeled excavators)………………………………………………………1002
2 ENGINE
Engine removal and installation (788 – 988 – 988 Plus ………………………………2002
Engine removal and installation (788 Plus)………………………………………………2002 Radiator and oil cooler ………………………………………………………………………….2003
4 ELECTRICAL SYSTEM
Electrical schematic (Crawler excavators) – (before November 1999)………….4001
Electrical schematic (Wheeled excavators) – (before November 1999)………..4001
Electrical schematic (Crawler excavators) – (November 1999 and after)………4001
Electrical schematic (Wheeled excavators) – (November 1999 and after)…….4001
Electronic system and troubleshooting (Crawler excavators) ……………………..4002
Electronic system and troubleshooting (Wheeled excavators) ……………………4002
Starter motor ……………………………………………………………………………………….4003
Alternator ……………………………………………………………………………………………4004
Powersensor diagnostic tool ………………………………………………………………….4010
5 UNDERCARRIAGE
Track group (Crawler excavators)…………………………………………………………..5002
6 DRIVE TRAIN
Travel reduction gear and brake (Crawler excavators) ………………………………6002
Swing reduction gear and brake (788 – 788 Plus)……………………………………..6003
Swing reduction gear and brake (988)…………………………………………………….6003
Swing reduction gear and brake (988 Plus)……………………………………………..6003
Front axle and service brake (Wheeled excavators)………………………………….6004
Rear axle and service brake (Wheeled excavators) ………………………………….6005
Gearbox and parking brake (Wheeled excavators) …………………………………..6008
Twin wheels (Wheeled excavators) ………………………………………………………..6020
7 UNDERCARRIAGE HYDRAULICS
Hydraulic travel motor (Mono-speed crawler excavators)…………………………..7002
Hydraulic travel motor (Two-speed crawler excavators) …………………………….7003
Hydraulic travel motor (Wheeled excavators) …………………………………………..7003
Travel control valve (Crawler excavators)………………………………………………..7030
Travel, stabilizer and dozer blade control valve
(wheeled excavators) ……………………………………………………………………….7031
Steering, stabilizer, dozer blade and front axle locking cylinders
(wheeled excavators ) ………………………………………………………………………7080
8 UPPERSTRUCTURE HYDRAULICS
Hydraulic inspection, adjustment and schematics
(crawler excavators) …………………………………………………………………………8001
Hydraulic inspection, adjustment and schematics
(wheeled excavators) ……………………………………………………………………….8001
Hydraulic swivel (Crawler excavators) …………………………………………………….8011
Hydraulic swivel (Wheeled excavators) …………………………………………………..8011
Hydraulic pumps (788 – 788 Plus)…………………………………………………………..8020
Hydraulic pumps (988 – 988 Plus)…………………………………………………………..8020
Hydraulic swing pump…………………………………………………………………………..8021
Attachment control valve……………………………………………………………………….8031
Swing control valve ………………………………………………………………………………8033
Rotary control valve (Orbitrol) (Wheeled excavators) ………………………………..8037
Hydraulic swing motor and forced-feed safety block …………………………………8040
Attachment and swing control block ………………………………………………………8050
Travel and option control block
(Foot pedal, Wheeled excavators)………………………………………………………8051
Travel hand control block (Inching, wheeled excavators) …………………………..8052
Direction of travel inverter control block (Inching, crawler excavators)…………8053
Travel control block (788 – 788 Plus 988 – 988 Plus wheeled excavators) ……8054
Brake module (wheeled excavators)……………………………………………………….8060
Parking brake electro-control valve (wheeled excavators) …………………………8061
Electro-control valve block (Crawler excavators)………………………………………8070
Electro-control valve block (wheeled excavators)……………………………………..8071
Selector block (788 Plus) ………………………………………………………………………8072
Attachment cylinders…………………………………………………………………………….8080
Safety valve ………………………………………………………………………………………..8081
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