1-1

INTRODUCTION

Section 1: Introduction ......................................... 1-1

Safety Precautions, Hazard Seriousness Level ... 1-2

Reporting Safety Defects ..................................... 1-2

Section 2: Specifications ...................................... 2-1

Section 3: Operation ............................................ 3-1

Section 4: Maintenance ....................................... 4-1

1-2

Reporting Safety DefectsSafety Precautions,Hazard Seriousness Level

1-3

1-4

1-5

1-6

2-1

Specifications and General Information ......................................................... 2-1

Model RTN35TD-T1 .................................................................... 2-2

Model RTN50TD3-T1 .................................................................. 2-3

Torque Specifications for Standard Hardware ............................................... 2-4

Standard Hardware Identification ................................................................... 2-4

Section 2 Specifications

2-2

Model RTN35TD-T1

SPECIFICATIONS

2-3

Model RTN50TD3-T1

2-4

Torque Specifications for Standard Hardware

Standard Hardware

3-1

Table of Contents .......................................................................................................................................................... 3-1

General ............................................................................................................................................................. 3-2

Trailer to Tractor Connecting Procedures ..................................................................................................................... 3-2

Trailer to Tractor Disconnection Procedure ................................................................................................................... 3-3

Gooseneck Removal ..................................................................................................................................................... 3-4

Gooseneck Attachment ................................................................................................................................................. 3-4

Multiple Ride Height Adjustment ................................................................................................................................... 3-4

Gooseneck to Platform Connections ............................................................................................................................ 3-5

Compression Block Adjustment .................................................................................................................................... 3-5

High Lift Gooseneck Operation ..................................................................................................................................... 3-6

Loading and Unloading Procedures .............................................................................................................................. 3-6

Front Loading and Unloading Procedures .................................................................................................................... 3-7

Rear Loading And Unloading Procedures ..................................................................................................................... 3-7

General Road Check Procedures ................................................................................................................................. 3-8

Table of ContentsSection 3 Operation

Illustrations

Figure 3-1. Inspection of Kingpin for wear .................................................................................................................... 3-2

Figure 3-2. Identification of Controls ............................................................................................................................. 3-3

Figure 3-3 Compression Block Positions ...................................................................................................................... 3-5

Figure 3-4.Gooseneck to Platform Connections ........................................................................................................... 3-5

Figure 3-5.Compression Block Adjustment ................................................................................................................... 3-5

Figure 3-6. Ride Height Adjustment .............................................................................................................................. 3-6

Figure 3-7. Blocking Under Rear of Trailer and Under Load Ramps ............................................................................ 3-8

3-2

Trailer to Tractor Connecting ProceduresGeneral

Figure 3-1. Inspection of Kingpin for wear

3-3

Trailer to Tractor DisconnectionProcedure

Figure 3-2. Identification of Controls

3-4

Gooseneck Removal

Gooseneck Attachment

Multiple Ride Height Adjustment

3-5

Figure 3-3 Compression Block Positions

Figure 3-4.Gooseneck to Platform Connections

Figure 3-5.Compression Block Adjustment

3-6

Figure 3-6. Ride Height Adjustment

High Lift Gooseneck Operation

Loading and Unloading Procedures

3-7

Front Loading and Unloading Procedures

Rear Loading And UnloadingProcedures

3-8

General Road Check Procedures

Figure 3-7. Blocking Under Rear of Trailer and Under Load Ramps

3-9

3-10

4-1

Table of Contents ............................................................ 4-1General ........................................................................... 4-3Maintenance Schedule ................................................... 4-3Maintenance Procedures ................................................ 4-6Fifth Wheel Plate & Kingpin Inspection & Lubrication ..... 4-6Frame Inspection ............................................................ 4-6Weld Repairs ................................................................... 4-6Wheel Bearings ............................................................... 4-7

Undercarriage ................................................................. 4-7Installation & Maintenance “Hutch” Spring Susp ............ 4-8Service Guide - Trailer Air Suspensions ....................... 4-10Periodic Inspections ...................................................... 4-10Suspension Components .............................................. 4-10Pivot Connection ........................................................... 4-10Alignment Adjustment ................................................... 4-10Height Control Valve ..................................................... 4-10Component Replacement - Air Suspension .................. 4-10Air Sprimgs.................................................................... 4-10Shocks ...........................................................................4-11Commonly Misdiagnosed Bushing Problems ................4-11Pivot Bushing .................................................................4-11

Tire, Rims and Disc Wheels .......................................... 4-13Tire Inflation .................................................................. 4-13Tire Overinflation ........................................................... 4-13Tire Underinflation ......................................................... 4-13Matching Dual tires ....................................................... 4-14Tire Measurement ......................................................... 4-14Removing Tire and Rim Assemblies ............................. 4-14Removing Tire and Disc Wheel Assemblies ................. 4-14Mounting & Dismounting Tires on Rims or DiscWheels .......................................................................... 4-16Mounting Tire and Rim Assemblies ............................... 4-16Mounting Tire and Ball Seat Type Disc WheelAssemblies .................................................................... 4-16Mounting Tire and Hub Piloted Type Disc Wheels ........ 4-16Checking Tightness on Cast Wheel/Rim Assemblies ... 4-16

Wheels and Hubs .......................................................... 4-17General ......................................................................... 4-17Checking Tightness on Mounted Dual Disc Wheels ..... 4-17Cast Wheel or Hub Removal ........................................ 4-18Inspection and Cleaning ............................................... 4-18Cast Wheel or Hub Installation ..................................... 4-18Preparing Bearing for Assembly ................................... 4-18

Air System and Brakes ................................................. 4-19Air System and Brakes - General ................................. 4-19Air System Tests ........................................................... 4-19Air Reservoir ................................................................. 4-20Air Hoses and Tubing .................................................... 4-20Brake Relay Emergency Valve ...................................... 4-20Air Brake Chambers ...................................................... 4-20Brake Air Supply System Description ........................... 4-20Relay Emergency Valve ................................................ 4-20Brake Chambers ........................................................... 4-23Brake Chamber Servicing ............................................. 4-23Brake Chamber Removal .............................................. 4-23Brake Chamber Disassembly ....................................... 4-23Cleaning and Inspection of Parts .................................. 4-23Brake Chamber Assembly ............................................ 4-23Installation ..................................................................... 4-24

Operating Checks ......................................................... 4-24Air Brakes - General ..................................................... 4-24Air Brakes...................................................................... 4-24Foundation Brake Components .................................... 4-24Brake Assembly ............................................................ 4-25Automatic Slack Adjuster .............................................. 4-25Recommended Preventive Maintenance ...................... 4-25Slack Adjuster ............................................................... 4-25Every Three Months or 25,000 Miles ............................ 4-25Every Six Months or 50,000 Miles ................................ 4-25Testing Adjuster Function .............................................. 4-26Boot Replacement ........................................................ 4-26Lining/Drum Replacement Procedure ........................... 4-27Camshaft Removal ....................................................... 4-28Cleaning and Inspection ............................................... 4-28Camshaft Installation .................................................... 4-28

Brake Disassembly ....................................................... 4-29Relining Brakes ............................................................. 4-29Installing New Brake Linings ......................................... 4-29Checking Brake Drums ................................................. 4-29Refinishing Brake Drums .............................................. 4-30Checking Brake Parts ................................................... 4-30Trouble Analysis For Air Brakes .................................... 4-31Assembling Brakes ....................................................... 4-31Electrical ........................................................................ 4-35Lighting System ............................................................ 4-35

Table of ContentsSection 4 Maintenance

4-2

Hydraulics, General ...................................................... 4-36Hydraulic Power Pack Filter .......................................... 4-36Checking Hydraulic Reservoir Oil Level ........................ 4-36Changing Hydraulic Oil ................................................. 4-36Hydraulic Power Pack Battery ...................................... 4-36Checking and Adjusting Relief Pressure on theGooseneck Control Valve .............................................. 4-38Trouble Analysis for Hydraulic Systems ........................ 4-39

Figure 4-1. Maintenance Checkpoints ............................ 4-5Figure 4-2. Check Oil Level of Oil Lubricated Bearings .. 4-7Figure 4-3. Tightening Sequence .................................... 4-7Figure 4-4. Proper tire Inflation ..................................... 4-13Figure 4-5. Measuring Tire With Endless Tape ............. 4-14Figure 4-6 Use of Tire Straightedge .............................. 4-14Figure 4-7. Removal of Rims on Cast Spoke Wheels ... 4-15Figure 4-8. Removal of Tires & Ball Seat Disc Wheels . 4-15Figure 4-8a. Removal of Tires &Hub Piloted Disc Wheels .............................................. 4-15Figure 4-9. Tightening Sequence of Standard GuniteDisc Wheels .................................................................. 4-17Figure 4-10. Filling Oil Lubricated Hub ......................... 4-18Figure 4-11. Brake Air Supply System .......................... 4-19Figure 4-12. Relay Emergency Valve ............................ 4-21Figure 4-13. Brake Chamber ........................................ 4-22Figure 4-14. Foundation Brake Components ................ 4-24Figure 4-17. Brake Assembly ........................................ 4-29Figure 4-18. Checking for Scored Drum ....................... 4-30Figure 4-19. Checking for Bell Mouthing ....................... 4-30Figure 4-20. Typical Trailer Electrical Schematic (AirBrakes) .......................................................................... 4-35Figure 4-22. Hydraulic Oil Check .................................. 4-36Figure 4-24. Hydraulic System Schematic ................... 4-37Figure 4-25. Directional Control Valve Pressure Relief . 4-38

Figure 6. Lubrication Points - Slack Adjuster ................ 4-25Figure 7. Adjuster Function ........................................... 4-26Figure 8. Location of Clevis Pins, Hex Extension, andBoot ............................................................................... 4-27Figure 9. Boot ............................................................... 4-27Figure 11. Measuring Maximum Stroke ........................ 4-27

Table 4-1. Maintenance Schedule ................................... 4-3Table 4-2. Electrodes for Weld Repairs ........................... 4-6

4-3

Maintenance ScheduleGeneral

Table 4-1 Maintenance Schedule

4-4

4-5

Figure 4-1. Maintenance Checkpoints

4-6

Maintenance Procedures

Weld Repairs

Frame Inspection

Fifth Wheel Plate and Kingpin Inspectionand Lubrication

Table 4-2. Electrodes For Weld Repairs

4-7

Undercarriage

Wheel Bearings

Figure 4-2. Check Oil Level of Oil Lubricated Bearings

Figure 4-3. Tightening Sequence

4-8

Installation and Maintenance“Hutch” Spring Suspension

4-9

4-10

Service Guide - Trailer Air Suspensions

Periodic Inspections

Suspension Components

Pivot Connection

Alignment Adjustment

Height Control Valve

Component Replacement - AirSuspension

Air Sprimgs

4-11

Commonly Misdiagnosed Bushing Problems

Shocks Pivot Bushing

4-12

4-13

Tire Inflation

Tire, Rims and Disc Wheels

Tire Overinflation

Tire Underinflation

Figure 4-4. Proper tire Inflation

4-14

Tire Measurement

Matching Dual tires

Removing Tire and Disc WheelAssemblies

Figure 4-5Measuring Tire With Endless Tape

Removing Tire and Rim Assemblies

Figure 4-6 Use of Tire Straightedge

4-15

Figure 4-7. Removal of Rims on Cast Spoke Wheels

Figure 4-8. Removal of Tires and Ball Seat Disc Wheels

Figure 4-8a. Removal of Tires and Hub Piloted Disc Wheels

4-16

Mounting Tire and Hub Piloted TypeDisc Wheels

Mounting and Dismounting Tires on Rimsor Disc Wheels

Checking Tightness onCast Wheel/Rim Assemblies

Mounting Tire and Rim Assemblies

Mounting Tire and Ball Seat Type DiscWheel Assemblies

4-17

General

Checking Tightness onMounted Dual Disc Wheels

Wheels and Hubs

Figure 4-9. Tightening Sequence ofStandard Gunite Disc Wheels

4-18

Preparing Bearing for Assembly

Inspection and CleaningCast Wheel or Hub Removal

Cast Wheel or Hub Installation

Figure 4-10. Filling Oil Lubricated Hub

4-19

Air System and Brakes - General

Air System and Brakes

Air System Tests

Figure 4-11. Brake Air Supply System

4-20

Brake Air Supply System Description

Air Hoses and Tubing

Air Reservoir

Brake Relay Emergency Valve

Air Brake Chambers

Relay Emergency Valve

4-21

Figure 4-12. Relay Emergency Valve

4-22

Figure 4-13. Brake Chamber

4-23

Brake Chambers

Brake Chamber Servicing

Brake Chamber Removal

Brake Chamber Disassembly

Cleaning and Inspection of Parts

Brake Chamber Assembly

4-24

Installation

Air Brakes

Air Brakes - General

Figure 4-14.Foundation Brake Components

Operating Checks

4-25

Brake Assembly

Slack Adjuster

Automatic Slack AdjusterRecommended Preventive MaintenanceEvery Three Monthsor 25,000 Miles

Every Six Monthsor 50,000 Miles

Figure 6.Lubrication Points - Slack Adjuster

4-26

Testing Adjuster Function

Boot Replacement

Figure 7. Adjuster Function

4-27

Figure 8. Location ofClevis Pins, Hex Extension, and Boot

Figure 9. Boot

Figure 10. Boot Position

Lining/Drum ReplacementProcedure

Figure 11. Measuring Maximum Stroke

4-28

Camshaft Removal

Cleaning and Inspection

Camshaft Installation

4-29

Checking Brake Drums

Relining Brakes

Installing New Brake Linings

Brake Disassembly

Figure 4-17. Brake Assembly

4-30

Refinishing Brake Drums

Checking Brake Parts

Figure 4-18. Checking for Scored Drum

Figure 4-19. Checking for Bell Mouthing

4-31

Trouble Analysis For Air Brakes

Assembling Brakes

4-32

4-33

4-34

4-35

Figure 4-20. Typical Trailer Electrical Schematic (Air Brakes)

Electrical

Lighting System

4-36

Hydraulics

Hydraulics, General Hydraulic Power Pack Battery

Hydraulic Power Pack Filter

Checking Hydraulic Reservoir Oil Level

Figure 4-22.Hydraulic Oil Check

Hydraulic Oil Drain Plug.

Changing Hydraulic Oil

4-37

Figure 4-24. Hydraulic System Schematic

4-38

Checking and Adjusting Relief Pressureon the Gooseneck Control Valve

Figure 4-25.Directional Control Valve Pressure Relief

4-39

Trouble Analysis for Hydraulic Systems

4-40