卡特彼勒推土机选型指导Basics

APPLICATION GUIDE

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MEDIUM TRACK-TYPE TRACTORS APPLICATION GUIDE

CAT MEDIUM TRACK-TYPE TRACTORS

TRACK-TYPE TRACTOR BASICS

TABLE OF CONTENTS

ESSENTIAL TRACTOR ANATOMY

Major operating components of track-type tractors.

Cab

All Cat Track-Type Tractor cabs are ergonomically designed to maximize operator comfort and efficiency throughout a long working shift.

Blade

Properly matching a tractor to the right dozer blade for its

intended application is critical in achieving maximum production and fuel efficiency. Factors to consider in blade selection include material weight, particle size and shape, presence of voids in the material, water content, incline and the distance the material needs to be moved.

Common Blade Types Universal (U)

Semi-Universal (SU)Straight (S)Angle (A)

Variable Pitch, Power Angle Tilt (VPAT)

Variable Pitch, Power Angle Tilt (VPAT) – foldable

Blades for specialized applications include: Variable Radius, Angling, Coal, Woodchip, Waste and Cushion blades.

Ground Engaging Tools (GET)

Ground engaging tools—such as blade cutting edges, end bits and ripper tips—impact tractor productivity by changing implement penetration and wear characteristics. GET can also dramatically affect blade life. Proper GET selection is another key to overall dozer productivity and operating costs. Lift Cylinder

Hydraulic cylinder that raises the blade up and down. Tilt Cylinder

Hydraulic cylinder that tilts the blade from side to side.Two tilt cylinders, one on each side of the blade, provide the ability to hydraulically adjust the pitch of the blade without leaving the seat of the tractor.

Angle Cylinder

Hydraulic cylinder that angles the blade either left or right.Push Arm

The large arms on either side of the tractor hold the dozer blade and allow it to move up and down and tilt side to side as the arms

pivot on the trunnions.

Outside Mounted C-Frame

Transfers blade load back through to the track roller frame and provides mounting point of mechanical angle blades.

Inside Mounted C-Frame

Transfers blade loads back through to the mainframe and provides mounting point of VPAT blades.

Tilt Brace

This brace sets the vertical angle (pitch) of the blade’s cutting edge to match the material and application. A fixed tilt brace must be adjusted manually by placing the push arm mounted end into one of three holes. For Variable Pitch Blades that angle, the tilt brace is replaced by a Pitch Link, which can be manually adjusted, without tools, to change the blade pitch.

Tag Link

Allows closer mounting of the blade to the machine to reduce machine length for improved maneuverability, balance, penetration, and pry out force. It also restricts side-to-side

movement, resulting in more stable dozing operations, and assists in transmitting blade loads to the tractor’s mainframe (D8T).

Trunnion

This large bearing attaches the blade push arm to the tractor’s track roller frame and allows the push arm to pivot up and down.

Final Drive

The final drives deliver engine power to the sprockets on either side of the tractor, which in turn pull the track over the rollers and idlers and power the machine forward or backward. On a “high-drive” tractor, the final drives are located above the track roller frame and idlers. On a “low-drive” tractor, they are located directly behind the track roller frame structure. Both high-drives and low-drives are isolated from any loads produced by the blade or the track roller frame.

Sprocket

This large toothed gear pulls the track around the roller frame. Sometimes the combined final drive/sprocket assembly is

referred to as the “sprocket.” A high-drive tractor is sometimes referred to as an “elevated sprocket” machine.

Idler

The unpowered counterpart to the sprocket, the idler guides the track around the front of a low-drive machine (high-drive configurations use an additional idler at the rear).

Roller Frame

The track roller frame is the large undercarriage assembly that supports the weight of the tractor. It provides mounting points for the idlers, bottom rollers that ride on the track and carrier rollers that support the track as it passes above the roller frame.

ESSENTIAL TRACTOR ANATOMY

Track

The track is a chain assembly that acts as “an infinite steel road” that the tractor lays down and picks back up as it travels. The large surface area of the track gives the tractor a very high level of traction and flotation on rough, soft and uneven ground. Track-type tractors are sometimes known as “crawler” tractors.

Track Shoes

Track shoes are the wide plates attached to the track chain. Track shoes may be wide or narrow, depending on the traction and flotation needed for each application. Track shoes may also have relief holes cut into the center to allow materials to extrude out of the track link box area.

Grousers

The raised portions of the track shoes are called grousers. Grousers may be taller, shorter, straight or angled or missing altogether, depending on the requirements and underfoot conditions of the application.

Undercarriage

A tractor’s undercarriage consists of the entire structure upon which the machine rests and the tracks ride. Undercarriage comes in many configurations—high-drive or low-drive,

suspended (D8T) or solid-mounted, standard and longer lengths, wider and longer for lower ground pressures and so on. Choosing the right undercarriage and track system means

balancing flotation versus slippage for the application, materials and underfoot conditions, the variety of applications a given machine is expected to take on and many other considerations.Once the machine goes to work, p …… 此处隐藏：9657字，全部文档内容请下载后查看。喜欢就下载吧 ……