Tractores de Cadenas:
D8N (N/S: 9TC1-Y SIG.; 1XJ1-Y SIG.; 5TJ1-Y SIG.; 7TK1-Y SIG.) D8Rserie II (N/S: AKA1-Y SIG.; 6YZ1-Y SIG.)
D8R (N/S: 7XM1-Y SIG.; 9EM1-Y SIG.) D8T (N/S: J8B1-Y SIG.; KPZ1-Y SIG.)
ReferenciaConsulte la Instrucción Especial, REHS4336, "Descripción de características, servicio de información e identificación de partes para el Tren de Rodaje SystemOne D8" para obtener información acerca del tren de rodaje SystemOne de los Tractores de Cadenas D8N, D8R, D8R serie II y D8T. La Instrucción Especial indicada anteriormente contiene la siguiente información acerca del Tren de Rodaje SystemOne D8:
• Conjunto de cartucho SystemOne de Caterpillar con un buje giratorio
• Eslabones maestros serrados
• Segmentos de acero resistentes con siete pernos
• Diseño de eslabón y Rueda Guía de Banda de Rodadura Central (CTI) resistente al desgaste por la torsión lateral axial
• Fácil modernización de las máquinas D8N, D8R y D8T
• Posicionamiento de la rueda guía SystemOne D8
• Ajuste de cadena para tren de rodaje SystemOne D8
• Piezas de repuesto reemplazables para la cadena SystemOne D8
• Expectativas de vida útil de la cadena y del sistema SystemOne D8
• Preinclinación del SystemOne D8
• Tablas de desgaste de los componentes de tren de rodaje para cadenas SystemOne D8 Nota: El tren de rodaje SystemOne D8 no recomendado para configuraciones de tren de rodaje no suspendido. Actualmente, la configuración de amortiguación de los bastidores de cadena no suspendidos no permite tanto desplazamiento de amortiguación como el de los bastidores de rodillos de cadena
suspendidos. Esto limita la capacidad del sistema de tren de rodaje para adaptarse a los efectos del conjunto de caja de eslabones, lo que puede producir la avería prematura de los sellos debido a la entrada de material a su alrededor. Además, no hay un conjunto de protección disponible para evitar la entrada de material alrededor de las ruedas guía.
Description of Features, Service Information and Parts
Identification for D8 SystemOne Undercarriage{4150}
SMCS - 4150Track-Type Tractor:
D8N (S/N: 9TC1-UP; 1XJ1-UP; 5TJ1-UP; 7TK1-UP) D8R Series II (S/N: AKA1-UP; 6YZ1-UP)
D8R (S/N: 7XM1-UP; 9EM1-UP) D8T (S/N: J8B1-UP; KPZ1-UP)
Introduction
Note: D8 SystemOne undercarriage is available from the factory on new machines as an optional attachment
Note: Effective with the dates that D8 SystemOne undercarriage becomes available, Non-Positive Pin Retention (Non-PPR) link assemblies will no longer be available from the factory on new D8 machines. Instead Positive Pin Retention (PPR) track will be standard, and SystemOne will be optional. Replacement Non-PPR track will continue to be available through the Parts Distribution System.
Note: SystemOne undercarriage will be available for the D8R and D8T for European Union (EU) countries on the effective target date from Cat Brazil Ltd with conventional idlers only.
SystemOne undercarriage for the D8T, D8R, and D8N is designed to extend undercarriage system life beyond that of PPR track and Non-PPR track in abrasive applications. The rotating bushing design in SystemOne track eliminates the need for a mid-life bushing turn as typically performed on PPR or non- PPR track. SystemOne track may be used with either conventional idlers or Center Tread Idlers (CTI). Link rail wear is reduced with the use of CTI's due to the fact that the CTI never contacts the link rail surface. Additionally, the CTI design reduces link scallop, a common source of operator discomfort. The narrow profile of the CTI allows for improved guarding that effectively keeps abrasive material from entering the track system.
SystemOne is not recommended for waste handling applications, LGP applications, hard bottom (non-suspended) configurations, or in heavy packing applications such as caliche or hard clay. The design of D8 SystemOne overcomes the effects of outward thrust wear which is common to all Track- Type Tractors. This is accomplished by the addition of hardened wear material to the inner links and to the sides of the CTI. Additionally, when purchased from the factory on new machines, cambered track roller frames will be standard. The addition of camber further eliminates the effects of outward thrust of the tracks and allows the full utilization of available wear material on the link, roller, and CTI.
See ""Track Life and System Life Expectations for D8 SystemOne" " for information on track and system life expectations. See ""Camber for D8 SystemOne" " for details of camber for the D8 SystemOne. Note: Do not perform any procedure that is outlined in this publication until you have read the information and you understand the information. Do not order parts until you read the information and you understand the information.
Do not attempt to disassemble or assemble this machine until you read and understand the disassembly and assembly instructions. Improper disassembly and assembly procedures could result in injury or death.
Accidental engine starting can cause injury or death to personnel working on the equipment.
To avoid accidental engine starting, disconnect the battery cable from the negative (−) battery terminal. Completely tape all metal surfaces of the disconnected battery cable end in order to prevent contact with other metal surfaces which could activate the engine electrical system. Place a Do Not Operate tag at the Start/Stop switch location to inform personnel that the equipment is being worked on.
The machine must be on a level, hard surface before a separation of the track is made. Any time a separation of both tracks is made, the
machine must have blocks correctly positioned so the machine will not move.
Keep away from the front of the machine when the track is pushed off the final drive. A minimum distance of 7.6 m (25 ft) is needed in front of the track to permit the track to move out onto the floor.
ReferenceRefer to the appropriate Disassembly and Assembly manual for your machine.
Features of D8 SystemOne
Caterpillar SystemOne Cartridge Assembly with a Rotating Bushing
Ver imagen
Illustration 1 g01449901
(1) Collar
(3) Insert (4) Seals (5) Pin
• The SystemOne rotating bushing design provides longer bushing life and eliminates the need for pin and bushing turns.
• SystemOne bushings rotate upon entering sprocket segments, eliminating the sliding wear that typically occurs in the reverse drive cycle with conventional track.
• All four seal lip contact surfaces within the SystemOne cartridge are treated with Caterpillar's unique Advanced Surface Technology which is a hard-face coating proven to extend leak free seal life.
• The cartridge is lifetime filled with Caterpillar premium synthetic 75W-140 track oil.
• Seal design within the cartridge has been optimized by the addition of an increased volume of seal material that allows for extended service life.
• The cartridge collars are precision welded to the center pin to control joint end-play throughout the life of the track.
• The cartridge is not a serviceable part. (See ""Serviceable Replacement parts for D8 SystemOne Track" " for a list of the serviceable replacement parts for the D8 SystemOne track.)
Serrated Master Links
Ver imagen
Illustration 2 g01449945
(6) 321-2018 Link Assembly Comprised of an inner link box and the non-threaded master link half. (7) 321-2019 Link Assembly Comprised of an inner link box and the threaded master link half. (8) Inner link
(9) Outer link
• D8 SystemOne is the first model of SystemOne undercarriage to offer the popular serrated tooth style of master links for ease of track separation and track connection.
• D8 SystemOne serrated tooth master links are serviced as a link box, meaning the serrated master link halves are only available from the factory assembled to inner links. Installation requires that this assembly must be assembled to the outer links in the SystemOne track. Refer to Illustration 2.
Ver imagen
Illustration 3 g01450013
(6) 321-2018 Link Assembly (7) 321-2019 Link Assembly
Since it is possible to install the individual master link box in the wrong orientation, please note the following procedure for the correct installation:
• 321-2018 Link Assembly : The serrated links in this section have through holes without threads. Consider
the serrated links in this section similar to the bushing end master link in standard track. The majority of the track shoe makes contact with the serrated link on this assembly. Refer to Illustration 3.
• 321-2019 Link Assembly : The serrated links in this section contain the threads for the bolts. Consider the
serrated links in this section similar to the pin end master link in standard track. The shoe grouser is over the bore for the cartridge on this assembly. Refer to Illustration 3.
Note: The bolt hole pattern on the master link shoe for the D8 SystemOne has a different bolt hole pattern than standard D8 SystemOne shoes. The bolt hole pattern on the master link shoe is wider than the bolt hole pattern on standard shoe. Also, the master link shoe is the only shoe on the D8 SystemOne track that has clipped grousers.
Illustration 4 g01748834
(A) Bolt hole width on standard track shoe 173.5 mm (6.8 inch) (B) Bolt hole width on master track shoe 200 mm (7.9 inch) Tough Steel Segments With Seven Bolts
Ver imagen
Illustration 5 g01451084
(10) Tough steel segments with seven bolts
• New segments with seven bolts eliminate the problem of segment bolt loosening on D8 SystemOne undercarriage.
• D8 SystemOne sprocket segments incorporate the latest design which utilizes added material on the ends of the segment in order to allow close tolerance machining. This allows the segments to make contact or to bridge under a load, thus sharing the load and resisting bolt loosening.
• The design for the rotating bushing on D8 SystemOne results in a lower wear rate for the segment. In most applications this allows for reuse of the segments for a second undercarriage track life. The longer available
service life with the D8 SystemOne segments generated the need for extended segment retention capability which was the basis for the seven bolt design.
• Instructions to retro-fit existing D8N, D8R, and D8T final drive hubs for use of seven bolt segments for conversion to D8 SystemOne are included in Special Instruction, REHS3373.
• Torque plus turn is required to attain maximum bolted joint life. Tighten the bolts to a torque of 300 ± 50 N·m (220 ± 37 lb ft). Tighten the bolts an additional 1/3 turn.
• The hardened washer should be placed under the bolt head and against the final drive hub.
Note: The link pitch for the undercarriage for D8 SystemOne is 2.1 mm (0.083 inch) longer than the link pitch for standard D8N, D8R, and D8T track, so the correct sprocket segments must be used for D8 SystemOne. The pitch length can be described as the center to center distance between the link pin bores. The part number for D8 SystemOne segments is 278-2375 Sprocket Segment .
Link and CTI Design that Resists Thrust Bias Wear
Ver imagen
Illustration 6 g01451076
(11) New design for the inner link with additional wear surface on the side
Illustration 7 g01451245
(12) D8 SystemOne link with the original design
(13) D8 SystemOne center tread idler with the original design (14) D8 SystemOne center tread idler with the new design. (15) D8 SystemOne link with the new design
(16) Thrust wing
• Field follow of early D8 SystemOne track in applications that are wet and highly abrasive indicated that thrust bias wear could result in dry joints.
• Thrust bias wear is wear to the inner link caused by contact with the center tread idler and the sides of the sprocket segments. This contact is caused by the outward thrust of the link assemblies occurring when the weight of the machine combines with the force of the final drive pulling up on the track as it wraps around the rear idler in FORWARD drive under load. Third body abrasive material between the inner link and the CTI accelerates this wear. When inner link wear becomes excessive, the inner seal can become exposed resulting in seal damage, oil loss in the cartridge, and joint failure.
• A redesign was completed on track links and center tread idlers that added additional hardened wear material to the contact surfaces of the links and the CTI. Refer to Illustration 6 and Illustration 7.
• The additional wear material on links and center tread idlers will eliminate exposure to the inner seal for the life of the track in most applications.
• In order to gauge the risk of inner seal wear of the link cartridge, the CTI thrust wings should be monitored. Refer to Illustration 7. In applications with extreme sand and water, consistent side slope operation, or on LGP models, the thrust wings on the inner sides of the idler may wear.
• If at track replacement time the thrust wings of the CTI are worn sufficiently from the inner side of the idler, the idler may be rotated 180 degrees for continued use. To do so rotate the CTI so that the unworn idler thrust wing toward the outside of the machine is installed toward the inside of the machine.
• A common wear pattern for the CTI is dimpling or indentation on the bushing contact surface. This wear pattern does not affect the functionality of the CTI and can be expected.
• CTI life is determined by three variables: Thrust wing wear, 120% tread wear and Wear life of the Duo-Cone seal assemblies
• A CTI is not reusable when both wings are worn away, 120% tread wear is reached, or Duo-Cone seal life is reached.
• Complete Custom Track Service (CTS) wear charts are available for the CTI and other D8 SystemOne components. Refer to ""Wear Charts for D8 SystemOne Undercarriage Components" " for the wear charts.
• The CTI for D8 SystemOne have internal components that are common to the conventional D8 idlers and follow the same rebuild guidelines.
• Pre-production use of CTIs on D8 SystemOne track showed idler tread wear life equal to two sets of track in most applications.
Note: The D8 has two different idler diameters, with the larger diameter idler positioned at the front of the machine and the smaller diameter idler at the rear of the machine.
Easy Retro-Fit to D8N, D8R, and D8T Machines
• A complete 316-8674 Idler Guarding Kit is available. This kit contains a complete set of parts for use with all D8 machines with a conventional suspended undercarriage. This idler guarding kit does an excellent job of preventing the entry of material around both front and rear idlers.
• 307-0761 Idler Fastener Group contains all of the hardware for shimming the conventional suspended
undercarriage.
• Refer to Special Instruction, REHS3373 for complete instructions on conversion and the installation of guarding.
Note: D8 SystemOne undercarriage is not recommended for waste handling applications. Note: D8 SystemOne undercarriage is not recommended for LGP applications.
Note: D8 SystemOne undercarriage is not recommended for hard-bottom (non-suspended) undercarriage configurations. At this time the recoil arrangement found in the hardbottom track frames does not allow as much recoil travel as that found in the suspended track roller frames. This limits the ability of the undercarriage system to accommodate the effects of link box packing which can potentially lead to premature seal failure due to material ingestion around the seals.
Additionally, there is no guarding package available to prevent material ingestion around the idlers.
D8 SystemOne Idler Positioning
Correct idler rise height ensures a smooth ride and also provides for accurate fine dozing capability.
• For conversion of D8N, D8R, or D8T machines from a conventional suspended undercarriage to SystemOne undercarriage, the 307-0761 Idler Fastener Gp provides idler block spacers and bogie shims to maintain correct idler rise height throughout system life. Refer to Special Instruction, REHS3373, "Converting D8N, D8R, and D8T To SystemOne Undercarriage", page 18, Illustration 41.
• D8 SystemOne undercarriage ordered as optional equipment on new machines from the factory will be equipped with new front and rear major bogie arms that will correctly position the CTI without the use of the idler block spacers.
Track Adjustment for D8 SystemOne Undercarriage
Upon installation of the D8 SystemOne undercarriage, track tension should be adjusted and maintained to the same tolerance as the D8 standard fixed bushing track.
Table 1
Track Tension
Application With Out Carrier Roller With Carrier Roller
Normal operation
Moderate tendency for sprocket jumping
100 ± 10 mm (3.9 ± 0.4 inch) 60 ± 10 mm (2.4 ± 0.4 inch)
Severe tendency for sprocket jumping
90 ± 10 mm (3.5 ± 0.4 inch) 55 ± 10 mm (2.2 ± 0.4 inch)
Note: In applications with moderate to heavy packing, track tension should be monitored after initial operation to be sure the track tension is maintained within guidelines.
Note: Center Tread Idlers are not recommended for heavy packing environments. Conventional Idlers are recommended for heavy packing environments.
Note: D8 SystemOne should never be operated with a track sag of less than 80 mm (3.1 inch) as overheating may occur which could damage the seals.
Serviceable Replacement parts for D8 SystemOne Track
Ver imagen
Illustration 8 g01749196
(9) Outer link
Illustration 9 g01749198
(8) Inner link
• The outer link, part number 304-5680. Refer to Illustration 8.
• The inner link box, part number 318-5033. This contains two inner links that are assembled to two cartridge assemblies. Refer to Illustration 9.
• The link assembly, part number 304-5688. This contains 44 joints of assembled SystemOne track and includes serrated master links.
• The serrated master link part numbers are 321-2018 and 321-2019. Refer to ""Serrated Master Links" " for the features of the serrated master link.
• Master link bolts (four per link assembly), part number 6V-1725. This is the same part as the long master link bolts in the conventional D8 fixed bushing track.
• The seven bolt sprocket segments for D8 SystemOne is 278-2375. Refer to ""Tough Steel Segments With Seven Bolts" " for the features of the seven bolt sprocket segments.
• Segment bolts, part number 5P-7665 ; hard washers, part number 6V-5841 ; and nuts, part number 7H- 3608
• Track rollers used for the D8 SystemOne are the standard D8N, D8R, and D8T single flange rollers, part number 246-0775. All rollers used with the D8 SystemOne are single flange rollers.
• Track guides for the D8 SystemOne are the same as used on conventional fixed bushing track, part number 248-2987. Bolts for track guides are part number 8T-8924 and washers for the track guide bolts are part number 8T-4994 .
• Standard CTIs for the D8 SystemOne are 308-4364 Track Idler Gp for the front and 308-4365 Track Idler Gp for the rear.
• All Track Groups made to order (MTO), Track Shoes, CTI Guarding Kit, Idler Fastener Kit, and associated hardware are listed and described in Special Instruction, REHS3373.
• The standard Multi-Pitch Tool is updated with attachments for use on D8 SystemOne undercarriage. Refer to Service Magazine, SEPD0936, "Tooling for Machines with D8 SystemOne Undercarriage " for the complete tool list for the Standard Multi-Pitch Tool. Refer to Special Instruction, REHS2403, "Installation and Removal of SystemOne Track with the Multi-Pitch Track Press" for instructions for using the Multi-Pitch Tool. Refer to Undercarriage Reconditioning Bulletin, SEBF9100, "Field Repair of SystemOne Track with the Multi-Pitch Track Press" for instructions regarding field repair of D8 SystemOne track using the Multi-Pitch tool.
Track Life and System Life Expectations for D8 SystemOne
• The design of the D8 SystemOne undercarriage wear life will allow for the reuse of the original CTIs and sprocket segments throughout a second set of tracks in most applications.
• Replacement of CTI duo cone seals is recommended every 6000 hours.
• All rollers on the D8 SystemOne are single flange rollers. Since D8 single flange rollers are 6 mm (0.236 inch) larger in diameter than double flange rollers, maximum roller tread diameter is utilized throughout the roller system.
• It is common for the D8 SystemOne rollers to run in a 1:1 ratio with the D8 SystemOne track.
• D8 SystemOne pre-production track was placed in a variety of extreme applications that included: High Impact, Wet and Dry Abrasion, Aggregate and General Earthmoving
• Undercarriage wear life varies with the application and operating conditions
• Most D8 SystemOne undercarriage life improvements ranged from 1.25 to 2 times the life of standard fixed bushing track put in the same application.
• Best life improvements were seen in abrasive applications where some machines exceeded 2 times the life of standard undercarriage.
• With D8 SystemOne track and center tread idlers, less wear occurs on the link rail surface, resulting in