Case 980 Excavator Service Manual Workshop Guide

Format : PDF
SUPPLIED AS DOWNLOADABLE LINK

Manual Included:
Service Manual:
513 pages
Specifications:
Brand:
Case
Model:
980
Type:
Excavator
Manuals:
Service Manual
Publication Numbers:
9-73476 (May 1977)
Language:
English
Format:
PDF

Description
Table of Contents
General
Engines
Fuel System
Hydraulics
Track and Suspension
Power Train
Brakes
Mounted Equipment
Manual Extract Engine Preignition
Preignition is the igniting of the fuel before the normal ignition occurs. This causes wild pinging, severe knock, and power loss. High temperature and pressure from preignition usually burns a hole through the center of the piston. The following are causes of preignition:
A. Carbon deposits that remain incandescent.
B. Valves operating at higher than normal temperature because of excessive guide clearance or improper seal with valve seats.
C. Hot spots caused by an inefficient or damaged cooling system.
D. Nozzles set at wrong cracking pressure.
E. Detonation or conditions leading to it.
F. Sharp edges in combustion chamber.
G. Wrong or contaminated fuel.