1999 Case Excavator 788 / 788 Plus / 988 / 988 Plus Service Manual (P/N Cre 7-80183GB)

• Covers the 1999 Case 788, 788 Plus, 988, and 988 Plus series crawler and wheeled excavators, including P, PL, P2A, P2AL, and P2A+2A configurations.

• Official Case France publication Cre 7-80183GB (issued November 1999, updated 06–2000).

• Contains 364 pages of technical data in a comprehensive PDF format, detailing chassis specifications, hydraulic schematics, and electrical diagrams.

• Acts as the baseline factory reference for launch builds, detailing the integrated electrical and hydraulic schematics essential for referencing mechanical systems prior to any standard repair.

• Comprehensive electronic system troubleshooting

• Factory torque specification charts

• Precise machine overall dimension views

• Detailed wiring diagrams for diagnostics

• Essential hydraulic pressure adjustment procedures

• Specific twin wheel safety protocols

• Powersensor hydraulic regulation system

• Orbitrol steering control components

• Injection pump servo-motor linkages

• Combination switch (commodo) circuits

• Printed circuit board (PCB) layouts

• Monoblock and articulated boom variations

• Diagnostic test socket mapping

Technical Coverage and Schematic Overview

Before executing any maintenance, always consult the included safety protocols and standardized hardware tightening orders to prevent equipment damage or personal injury. This documentation delivers a structured breakdown of the 788 and 988 machine systems. You get complete electrical cabinet printed circuit diagrams for both standard and optional equipment. It details pinout identification alongside exact schematic symbol definitions. Beyond electrical components, the manual outlines hydraulic power management and provides undercarriage dimensions for configurations like the CK and LC track setups. Included are precise instrument panel electrical schematics, twin wheel safety drawings, fluid requirement charts, and transportation overall dimension views. Engine specifications, including turbo-charged diesel power ratings, are mapped out clearly for accurate shop reference.

Troubleshooting Value and Specification Highlights

Deep-dive specification tables break down exact fluid and lubricant requirements. It outlines ISO VG 46, 100, and 22 viscosities based strictly on ambient climate conditions. In the general machine data section, the engine oil capacity for the Case 788 clocks in at exactly 10 liters. The hydraulic system working pressure sits at 350 bar across both models.

Navigating heavy excavator electrical mechanics comes with hidden risks; a common diagnostic trap on these models is misdiagnosing a sluggish hydraulic response as a failing main pump when the root cause actually originates from degraded connections at the injection pump servo-motor. Furthermore, attempting to disassemble wheeled variants without completely deflating both tires can cause an explosive twin wheel retaining ring failure. Relying on the factory pinout data to verify the electronic control box via the printed circuit diagnostic LED will save your shop from replacing perfectly functional, expensive parts.

While this OEM publication serves purely as an informational review of the mechanical, electrical, and dimensional specifications for the complete machine portfolio rather than basic mechanical teardowns, it crucially delivers the step-by-step system tests, pressure adjustments, and electronic troubleshooting sequences required to bypass expensive dealership diagnostic fees.