Komatsu Dresser TD7H, TD8H, TD9H Dozer Service Manual

Table of Contents

INTRODUCTION – SECTION 1
MISCELLANEOUS – SECTION 2
BRAKES – SECTION 4
STEERING – SECTION 5
COOLING – SECTION 6
DRIVE TRAIN – SECTION 7
DIRECT DRIVE – SECTION 7A
TORQUE CONVERTER – SECTION 7B
TRANSMISSION – SECTION 7C
STEERING DRIVE – SECTION 7E
SPROCKET DRIVE – SECTION 7F
ELECTRICAL – SECTION 8
FRAME – SECTION 9
HYDRAULICS – SECTION 10
PUMPS AND MOTORS – SECTION 10A
VALVES – SECTION 10B
CYLINDERS – SECTION 10C
INSTRUMENTS – SECTION 11
POWER – SECTION 12
SUPERSTRUCTURE – SECTION 13
UNDERCARRIAGE – SECTION 14
TRACK CHAIN – SECTION 15
MOUNTED EQUIPMENT – SECTION 17

This Dresser shop manual includes information for locations, specifications, service/special tools, tolerances, pressures, lubricants and sealants, special torques, tests and adjustments, assembly tips and service bulletin references for various components of the machine. This shop manual is divided into major sections. These sections are indexed by title and divided by individual section index tab. To use this shop manual, locate the section required and turn to that section index tab.

The cranking motor provides high starting torque by using a high speed motor through an offset gear reduction unit. It produces up to 4 hp (3 kW) of output.

The cranking motor has a totally enclosed, solenoid (1) operated mechanism for positive shift of the pinion into engagement. The solenoid waffle type contact faces and a solid link between the contact disc assembly and the solenoid plunger helps prevent contact sticking.

The shift lever (11) of the Dresser TD7H, TD8H, TD9H Dozer is attached to the plunger on one end and mates with a collar on the clutch drive (2) at the other end. The action of the lever forces the drive pinion into engagement with the engine flywheel when the magnetic pull of the solenoid draws the plunger in.

A medium duty, 5 roll overrunning drive is used for low overrun friction and long operating life. The drive shaft (15) is supported by a ball bearing (10) at the gear reduction end and by a sleeve bushing (6) at the drive end. An external helical spline on the drive shaft of the Dresser TD7H, TD8H, TD9H Dozer turns the pinion as it moves into engagement with the engine flywheel. An internal gear at the gear reduction end of the drive shaft is driven by the armature (21) shaft gear at a speed of one drive shaft revolution for each 3-7/s revolutions of the armature.

The armature is dynamically balanced and rides in sealed ball bearings (8 and 9)at each end. Steel banding and varnish impregnation are used for added armature strength. The molded bar commutator receives electrical power through radially positioned, one piece brushes (4 and 5). Constant pressure brush springs (7) are used for even brush wear and long brush life.