Case David Brown 770, 780, 880, 990, 1200 Implematic Tractor Service Manual

Table of Contents

Front Axle and Steering

• Front Wheel Alignment
• Front Hubs
• Stub Axles
• Front Axle
• Steering Box

Power Assisted Steering

• Operation
• Maintenance and Services
• Fault Finding
• Repair Operations

Hydrostatic Power Steering

• Operation
• Operation of Servo Valve
• Maintenance and Service
• Fault Finding
• Repair Operations

Dimension data

Introduction
The engine fitted to 990 Agricultural Tractors is designated A04/47 and is a four-cylinder unit of 3i in. bore and 4½ in. stroke, fitted with wet cylinder sleeves. As the engine must have a flywheel suitable for the clutch (Live drive or Non-Live drive) the suffix A or B is included in the designation to indicate the type of flywheel fitted and therefore the tractor model on which the engine is used.

The engine fitted to 990 Industrial Tractors is designated 104/47 and is basically identical to the A04/47 engine, the only difference being that the 104/47 engine is fitted with a flywheel suitable for the twin-plate clutch and has a splined coupling flange attached to the longer flywheel bolts.