Komatsu D155A-6 Dozer Service Manual

Description

Table of Contents

00 Index and foreword
Foreword and general information
01 Specification
Specification and technical data
10 Structure, function and maintenance standard
Engine and cooling system
Power train
Undercarriage and frame
Hydraulic system
Work equipment
Cab and its attachments
Electrical system
20 Standard value table
Standard service value table
30 Testing and adjusting
40 Troubleshooting
50 Disassembly and assembly
60 Air conditioner
90 Diagrams and drawings

1. General Instructions
This section presents under one heading the basic information and procedures common to the sections on “Disassembly and Assembly”, “Testing and Adjustments”, “Troubleshooting”, and “Removal and Installation”. It is essential for the serviceman to thoroughly understand and know this section till it becomes a part of his common sense.

2. Structure and Function.
This section gives a detailed explanation of the “Structure” with details and drawings of the “Constituent Parts” and “block” or “circuit” diagrams, arranged for the serviceman, but also useful as a textbook for training service personnel. The Training Aids should is use to cover the basic theory in this Manual.

3. Testing and Adjustments.
Procedures of all the necessary “Tests” and “Adjustments” are describe with photographs showing the necessary measuring equipment and the location for making the measurements. This should aid the serviceman in his trouble shooting, checking and adjusting work.

4. Troubleshooting
Typical common troubles are listed and systematically described; with their causes and the procedures for finding and diagnosing the symptoms.
As it is impossible to list all of the possible troubles, the serviceman should study the sections covering the “Structure and Function” and “Testing and Adjustments” and apply this knowledge to diagnose any non-listed troubles.

5. Manual Specifications Dozer
In this section, all standard dimensions and tolerances that are necessary to perform Testing and Adjustments is mention with drawings together with, appropriate procedures for disassembly and assembly, performing repairs, or troubleshooting. However, basic dimensions and tolerances, for repairs or rebuilding, are limited to those machine parts most commonly worked on.

Hydraulic motor
Function
– This hydraulic motor is called a swash plate type axial piston motor. It converts the energy of the pressurized oil sent from the hydraulic pump into rotary motion.

Principle of operation
– The oil sent from the hydraulic pump flows through valve plate (7) into cylinder block (5).
This oil can flow on only one side of the (Y-Y) line connecting the top dead center and bottom dead center of the stroke of piston (4).
– The oil sent to one side of cylinder block (5) presses piston (4) [4 or 5 pieces], and generates force (F1)[F1 = P x xD2/4].
– This force is applied to thrust plate (2). Since thrust plate (2) is fixed to the angle of (a) degrees to the output shaft(1), the force is divided into components (F2) and (F3).
– The radial component (F3) generates torque [T = F3 x ri] against the (Y-Y) line connecting the top dead center and bottom dead center.
– The result of this torque [T = (F3 x ri)] rotates cylinder block (5) through the piston.
– Since this cylinder block (5) is splined to the output shaft, the output shaft revolves to transmit the torque.