MACK T313, T318 Service Manual

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TRANSMISSIONS

T313–T318(L)(LR)(21)(L21)(LR21)

SERVICE MANUAL

OCTOBER 2008

(REVISED)

10-123

TRANSMISSIONS

T313–T318(L)(LR)(21)(L21)(LR21)

SERVICE MANUAL

T313–T318(L)(LR)

OCTOBER 2008 (REVISED — SUPERSEDES ISSUE DATED JULY 2003)

T313–T318(21)(L21)(LR21)

10-123

ATTENTION

The information in this manual is not all inclusive and cannot take into account all unique situations. Note that some illustrations are typical and may not reflect the exact arrangement of every component installed on a specific chassis.

The information, specifications, and illustrations in this publication are based on information that was current at the time of publication.

No part of this publication may be reproduced, stored in a retrieval system, or be transmitted in any form by any means including (but not limited to) electronic, mechanical, photocopying, recording, or otherwise without prior written permission of Mack Trucks, Inc.

Page ii

TABLE OF CONTENTS

Page iii

TABLE OF CONTENTS

INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

SAFETY INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Advisory Labels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Service Procedures and Tool Usage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

EXPLANATION OF NUMERICAL CODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

CONVERSION CHART . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

VISUAL IDENTIFICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

TRANSMISSION IDENTIFICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Unit Identification Stamping Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

DESCRIPTION AND OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

DESCRIPTION AND OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

T313–T318(L)(LR)(21)(L21)(LR21) Transmissions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

T313 Series Gear Ratios and Shift Pattern . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

T318 Series Gear Ratios and Shift Pattern . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

T313(L)(LR)(21)(L21)(LR21) Shifting Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

T318(L)(LR)(21)(L21)(LR21) Shifting Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Guidelines for PTO Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

T313 Power Flow Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27

T318 Power Flow Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30

COMPONENT LOCATOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

TRANSMISSION MAJOR COMPONENT LOCATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

TROUBLESHOOTING CHARTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

TRANSMISSION MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

Checking Oil Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

Changing Oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

Magnetic Oil Filter Plug . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

Air Breather(s) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

REPAIR INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

TRANSMISSION DISASSEMBLY PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

TRANSMISSION COMPONENT DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

Main Case Shift Cover Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

Rear Case Shift Cover Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84

Three-Position Range Shift Cylinder Disassembly (Compound Neutralizing) . . . . . . . . . . . . . . 86

Two-Position Range Shift Cylinder Disassembly (Compound Non-Neutralizing) . . . . . . . . . . . 89

Range Shift Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90

Main Drive Pinion Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92

Front Mainshaft Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .95

Rear Mainshaft (Output Shaft) and Synchronizer Disassembly . . . . . . . . . . . . . . . . . . . . . . . . 103

Rear Mainshaft Bearing Cover Disassembly: T313–T318(L)(LR) . . . . . . . . . . . . . . . . . . . . . . 115

Rear Output Housing Disassembly: T313–T318(21)(L21)(LR21) . . . . . . . . . . . . . . . . . . . . . . 117

Front Countershaft Front Bearing Cover Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118

Front Countershaft Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119

Front Countershaft Rear Bearing Cover Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122

Rear Countershaft Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123

Rear Countershaft Bearing Cover Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124

Reverse Idler Gear Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125

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TABLE OF CONTENTS

INSPECTION OF PARTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126

Inspection and Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126

Bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126

Gears . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126

Shifter Forks, Sliding Clutches and Shift Rails . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126

Oil Seals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127

General Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128

General Reassembly Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128

TRANSMISSION COMPONENT REASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129

Reverse Idler Gear Reassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129

Rear Countershaft Bearing Cover Reassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130

Rear Countershaft Reassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131

Front Countershaft Rear Bearing Cover Reassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133

Front Countershaft Reassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134

Front Countershaft Front Bearing Cover Reassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139

Rear Mainshaft Bearing Cover Reassembly: T313–T318(L)(LR) . . . . . . . . . . . . . . . . . . . . . . 140

Rear Output Housing Reassembly: T313–T318(21)(L21)(LR21) . . . . . . . . . . . . . . . . . . . . . . 142

Rear Mainshaft (Output Shaft) and Synchronizer Reassembly . . . . . . . . . . . . . . . . . . . . . . . . 145

Front Mainshaft Reassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159

Main Drive Pinion Reassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 168

Range Shift Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171

Two-Position Range Shift Cylinder Reassembly (Compound Non-Neutralizing) . . . . . . . . . . . 173

Three-Position Range Shift Cylinder Reassembly (Compound Neutralizing) . . . . . . . . . . . . . 178

Rear Case Shift Cover Reassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 181

Main Case Shift Cover Reassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 184

TRANSMISSION REASSEMBLY PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 198

SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 223

TRANSMISSION SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 224

Torque Specifications, T313–T318(L)(LR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 224

Torque Specifications, T313–T318(21)(L21)(LR21) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 226

Gear Identification, T313–T318(21) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 228

Gear Identification, T313–T318(L)(LR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 230

Gear Identification, T313–T318(L21)(LR21) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 232

Fits and Limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 234

General Tolerances, T313–T318(L)(LR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 235

General Tolerances, T313–T318(21)(L21)(LR21) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 236

Transmission Specifications and Capacities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 237

SCHEMATIC & ROUTING DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 239

AIR PIPING DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 240

T313–T318(L)(LR)(21)(L21)(LR21) Air Control without Compound Neutralizing for

PTO Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 240

T313–T318(L)(LR)(21)(L21)(LR21) Air Control with Compound

Neutralizing for PTO Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 242

SPECIAL TOOLS & EQUIPMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 245

SPECIAL TOOLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 246

DISASSEMBLED VIEWS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 247

TRANSMISSION DISASSEMBLED VIEWS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 248

INDEX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 257

Page v

NOTES

Page vi

INTRODUCTION

Page 1

INTRODUCTION

SAFETY INFORMATION

Advisory Labels

Cautionary signal words (Danger-Warning-Caution) may appear in various locations throughout this manual. Information accented by one of these signal words must be observed to minimize the risk of personal injury to service personnel, or the possibility of improper service methods which may damage the vehicle or cause it to be unsafe. Additional Notes and Service Hints are used to emphasize areas of procedural importance and provide suggestions for ease of repair. The following definitions indicate the use of these advisory labels as they appear throughout the manual:

Danger indicates an unsafe practice that could result in death or serious personal injury. Serious personal injury is considered to be permanent injury from which full recovery is NOT expected, resulting in a change in life style.

Warning indicates an unsafe practice that could result in personal injury.

Personal injury means that the injury is of a temporary nature and that full recovery is expected.

Caution indicates an unsafe practice that could result in damage to the product.

Note indicates a procedure, practice, or condition that must be followed in order for the vehicle or component to function in the manner intended.

A helpful suggestion that will make it quicker and/or easier to perform a procedure, while possibly reducing service cost.

Page 2

INTRODUCTION

Service Procedures and Tool Usage

Anyone using a service procedure or tool not recommended in this manual must first satisfy himself thoroughly that neither his safety nor vehicle safety will be jeopardized by the service method he selects. Individuals deviating in any manner from the instructions provided assume all risks of consequential personal injury or damage to equipment involved.

Also note that particular service procedures may require the use of a special tool(s) designed for a specific purpose. These special tools must be used in the manner described, whenever specified in the instructions.

1. Before starting a vehicle, always be seated in the driver's seat, place the transmission in neutral, apply the parking brakes, and push in the clutch pedal. Failure to follow these instructions could produce unexpected vehicle movement, which can result in serious personal injury or death.

2. Before working on a vehicle, place the transmission in neutral, set the parking brakes, and block the wheels. Failure to follow these instructions could produce unexpected vehicle movement, which can result in serious personal injury or death.

Engine-driven components such as Power Take-Off (PTO) units, fans and fan belts, driveshafts and other related rotating assemblies, can be very dangerous. Do not work on or service engine-driven components unless the engine is shut down. Always keep body parts and loose clothing out of range of these powerful components to prevent serious personal injury. Be aware of PTO engagement or nonengagement status. Always disengage the PTO when not in use.

Do not work under a vehicle that is supported only by a hydraulic jack. The hydraulic jack could fail suddenly and unexpectedly, resulting in severe personal injury or death. Always use jackstands of adequate capacity to support the weight of the vehicle.

Before towing the vehicle, place the transmission in neutral and lift the rear wheels off the ground, or disconnect the driveline to avoid damage to the transmission during towing.

REMEMBER,

SAFETY . . . IS NO ACCIDENT!

Page 3

INTRODUCTION

Mack Trucks, Inc. cannot anticipate every possible occurrence that may involve a potential hazard. Accidents can be avoided by recognizing potentially hazardous situations and taking necessary precautions. Performing service procedures correctly is critical to technician safety and safe, reliable vehicle operation.

The following list of general shop safety practices can help technicians avoid potentially hazardous situations and reduce the risk of personal injury. DO NOT perform any services, maintenance procedures or lubrications until this manual has been read and understood.

앫 Perform all service work on a flat, level

surface. Block wheels to prevent vehicle from rolling.

앫 DO NOT wear loose-fitting or torn clothing.

Remove any jewelry before servicing vehicle.

앫 ALWAYS wear safety glasses and protective

shoes. Avoid injury by being aware of sharp corners and jagged edges.

앫 Use hoists or jacks to lift or move heavy

objects.

앫 NEVER run engine indoors unless exhaust

fumes are adequately vented to the outside.

앫 Be aware of hot surfaces. Allow engine to

cool sufficiently before performing any service or tests in the vicinity of the engine.

앫 Keep work area clean and orderly. Clean up

any spilled oil, grease, fuel, hydraulic fluid, etc.

앫 Only use tools that are in good condition,

and always use accurately calibrated torque wrenches to tighten all fasteners to specified torques. In instances where procedures require the use of special tools which are designed for a specific purpose, use only in the manner described in the instructions.

앫 Do not store natural gas powered vehicles

indoors for an extended period of time (overnight) without first removing the fuel.

앫 Never smoke around a natural gas powered

vehicle.

Page 4

INTRODUCTION

EXPLANATION OF NUMERICAL CODE

The organization of MACK service manuals has been upgraded to standardize manual content according to a reference system based on component identification. The reference system helps link the information contained in this publication with related information included in other MACK service-warranty publications, such as associated service bulletins, warranty manuals, and MACK Service Labor Time Standards.

The system is based on a numerical code first digit of which identifies the general component grouping as listed here:

GROUP 000 — GENERAL DATA

GROUP 100 — CHASSIS

GROUP 200 — ENGINE

GROUP 300 — CLUTCH, TRANSMISSION, TRANSFER CASE AND PTO

, the

GROUP 400 — STEERING, AXLES, WHEELS AND TIRES, DRIVELINE

GROUP 500 — BRAKES, AUXILIARY SYSTEMS

GROUP 600 — CAB, TRUCK BODY

GROUP 700 — ELECTRICAL

The second two digits of the three-digit code are used to identify the system, assembly or subassembly, as appropriate, within each of the groupings. The codes applicable to this publication are shown at the beginning of each procedure, as necessary, to guide you to specific component information.

Additionally, a two-character alpha-code [GA] CASE, MAIN) may be shown with each operation. This alpha code, in combination with the three-digit Group number, identifies the specific assembly, sub-assembly or part, and directly relates to the first five positions of the operation code listed in MACK Service Labor Time Standards.

(i.e.,

Example of Numerical Code

Page 5

INTRODUCTION

CONVERSION CHART

Conversion Units Multiply By:

Length Calculations

Inches (in) to Millimeters (mm) 25.40

Inches (in) to Centimeters (cm) 2.540

Feet (ft) to Centimeters (cm) 30.48

Feet (ft) to Meters (m) 0.3048

Yards (yd) to Centimeters (cm) 91.44

Yards (yd) to Meters (m) 0.9144

Miles to Kilometers (km) 1.609

Millimeters (mm) to Inches (in) 0.03937

Centimeters (cm) to Inches (in) 0.3937

Centimeters (cm) to Feet (ft) 0.0328

Centimeters (cm) to Yards (yd) 0.0109

Meters (m) to Feet (ft) 3.281

Meters (m) to Yards (yd) 1.094

Kilometers (km) to Miles 0.6214

Area Calculations

Square Inches (sq-in) to Square Millimeters (sq-mm) 645.2

Square Inches (sq-in) to Square Centimeters (sq-cm) 6.452

Square Feet (sq-ft) to Square Centimeters (sq-cm) 929.0

Square Feet (sq-ft) to Square Meters (sq-m) 0.0929

Square Yards (sq-yd) to Square Meters (sq-m) 0.8361

Square Miles (sq-miles) to Square Kilometers (sq-km) 2.590

Square Millimeters (sq-mm) to Square Inches (sq-in) 0.00155

Square Centimeters (sq-cm) to Square Inches (sq-in) 0.155

Square Centimeters (sq-cm) to Square Feet (sq-ft) 0.001076

Square Meters (sq-m) to Square Feet (sq-ft) 10.76

Square Meters (sq-m) to Square Yards (sq-yd) 1.196

Square Kilometers (sq-km) to Square Miles (sq-miles) 0.3861

Volume Calculations

Cubic Inches (cu-in) to Cubic Centimeters (cu-cm) 16.387

Cubic Inches (cu-in) to Liters (L) 0.01639

Quarts (qt) to Liters (L) 0.9464

Gallons (gal) to Liters (L) 3.7854

Cubic Yards (cu-yd) to Cubic Meters (cu-m) 0.7646

Cubic Centimeters (cu-cm) to Cubic Inches (cu-in) 0.06102

Liters (L) to Cubic Inches (cu-in) 61.024

Liters (L) to Quarts (qt) 1.0567

Liters (L) to Gallons (gal) 0.2642

Cubic Meters (cu-m) to Cubic Yards (cu-yd) 1.308

Page 6

INTRODUCTION

Conversion Units Multiply By:

Weight Calculations

Ounces (oz) to Grams (g) 28.5714

Pounds (lb) to Kilograms (kg) 0.4536

Pounds (lb) to Short Tons (US tons) 0.0005

Pounds (lb) to Metric Tons (t) 0.00045

Short Tons (US tons) to Pounds (lb) 2000

Short Tons (US tons) to Kilograms (kg) 907.18486

Short Tons (US tons) to Metric Tons (t) 0.90718

Grams (g) to Ounces (oz) 0.035

Kilograms (kg) to Pounds (lb) 2.205

Kilograms (kg) to Short Tons (US tons) 0.001102

Kilograms (kg) to Metric Tons (t) 0.001

Metric Tons (t) to Pounds (lb) 2205

Metric Tons (t) to Short Tons (US tons) 1.1023

Metric Tons (t) to Kilograms (kg) 1000

Force Calculations

Ounces Force (ozf) to Newtons (N) 0.2780

Pounds Force (lbf) to Newtons (N) 4.448

Pounds Force (lbf) to Kilograms Force (kgf) 0.456

Kilograms Force (kgf) to Pounds Force (lbf) 2.2046

Kilograms Force (kgf) to Newtons (N) 9.807

Newtons (N) to Kilograms Force (kgf) 0.10196

Newtons (N) to Ounces Force (ozf) 3.597

Newtons (N) to Pounds Force (lbf) 0.2248

Torque Calculations

Pound Inches (lb-in) to Newton Meters (N•m) 0.11298

Pound Feet (lb-ft) to Newton Meters (N•m) 1.3558

Pound Feet (lb-ft) to Kilograms Force per Meter (kgfm) 0.13825

Newton Meters (N•m) to Pound Inches (lb-in) 8.851

Newton Meters (N•m) to Pound Feet (lb-ft) 0.7376

Newton Meters (N•m) to Kilograms Force per Meter (kgfm) 0.10197

Kilograms Force per Meter (kgfm) to Pound Feet (lb-ft) 7.233

Kilograms Force per Meter (kgfm) to Newton Meters (N•m) 9.807

Radiator Specific Heat Dissipation Calculations

British Thermal Unit per Hour (BTU/hr) to Kilowatt per Degree Celsius (kW/°C) 0.000293

Kilowatt per Degree Celsius (kW/°C) to British Thermal Unit per Hour (BTU/hr) 3414.43

Temperature Calculations

Degrees Fahrenheit (°F) to Degrees Celsius (°C) (°F − 32) x 0.556

Degrees Celsius (°C) to Degrees Fahrenheit (°F) (1.8 x °C) + 32

Page 7

INTRODUCTION

Conversion Units Multiply By:

Pressure Calculations

Atmospheres (atm) to Bars (bar) 1.01325

Atmospheres (atm) to Kilopascals (kPa) 101.325

Bars (bar) to Atmospheres (atm) 0.98692

Bars (bar) to Kilopascals (kPa) 100

Bar (bar) to Pounds per Square Inch (psi) 14.5037

Inches of Mercury (in Hg) to Kilopascals (kPa) 3.377

Inches of Water (in H2O) to Kilopascals (kPa) 0.2491

Pounds per Square Inch (psi) to Kilopascals (kPa) 6.895

Pounds per Square Inch (psi) to Bar (bar) 0.06895

Kilopascals (kPa) to Atmospheres (atm) 0.00987

Kilopascals (kPa) to Inches of Mercury (in Hg) 0.29612

Kilopascals (kPa) to Inches of Water (in H2O) 4.01445

Kilopascals (kPa) to Pounds per Square Inch (psi) 0.145

Power Calculations

Horsepower (hp) to Kilowatts (kW) 0.74627

Kilowatts (kW) to Horsepower (hp) 1.34

Fuel Performance Calculations

Miles per Gallon (mile/gal) to Kilometers per Liter (km/L) 0.4251

Kilometers per Liter (km/L) to Miles per Gallon (mile/gal) 2.352

Velocity Calculations

Miles per Hour (mile/hr) to Kilometers per Hour (km/hr) 1.609

Kilometers per Hour (km/hr) to Miles per Hour (mile/hr) 0.6214

Volume Flow Calculations

Cubic Feet per Minute (cu-ft/min) to Liters per Minute (L/min) 28.32

Liters per Minute (L/min) to Cubic Feet per Minute (cu-ft/min) 0.03531

Page 8

VISUAL IDENTIFICATION

Page 9

VISUAL IDENTIFICATION

TRANSMISSION IDENTIFICATION

Figure 1 — Location of Identification Stamping on Left Side of Main Case

Unit Identification Stamping Location

The following model code information is stamped on the left side of the transmission, toward the rear of the main case.

Figure 2 — Unit Identification Stamping

1. Unit Symbol Identification T = transmission 3 = 300 series 13/18 = useable forward speeds L = low forward gear R = low reverse gear 21 = 2100 lb-ft torque capacity

2. Transmission Serial No.

3. Transmission Assembly (Part) No. * = digits may vary

4. Specific variant of the base assembly number (variant to item No. 3)

Page 10

VISUAL IDENTIFICATION

Figure 3 — Cutaway View of T313/T318 Transmission

Page 11

VISUAL IDENTIFICATION

Figure 4 — Cutaway View of T313L/T318L Transmission

Page 12

VISUAL IDENTIFICATION

Figure 5 — Cutaway View of T313LR/T318LR Transmission

Page 13

VISUAL IDENTIFICATION

Figure 6 — Cutaway View of T313L21/T318L21 Transmission

Page 14

VISUAL IDENTIFICATION

Figure 7 — Cutaway View of T313LR21/T318LR21 Transmission

Transmission model not shown:

앫 T31321/T31821

Page 15

NOTES

Page 16

DESCRIPTION AND OPERATION

Page 17

DESCRIPTION AND OPERATION

T313–T318(L)(LR)(21)(L21)(LR21) Transmissions

DESCRIPTION

The T313/T318 series transmissions are a member of a new family of MACK transmissions designated as MAXITORQUE transmissions. These transmissions are the next evolution of the durable triple-countershaft transmission. New features and product enhancements have been engineered into these transmissions to provide a wide range of advantages which include the following:

앫 New and revised gear ratios for greater

overall range and versatility

앫 Lower “LOs” in forward and reverse for

superior site maneuvering

앫 Improved shift quality through the use of a

new sliding clutch with a fine-pitch tooth design versus the coarse-pitch tooth design of previous transmissions

앫 Enhanced durability

앫 Weight reduction versus the previous series

transmissions

The T313/T318 transmissions are triple-countershaft units. They consist of a compact main box which houses five non-synchronized forward-speed gear sets plus a reverse gear set. The rear case of the T313/T318 transmission is also a triple-countershaft unit. The rear case consists of Lo-range and Hi-range gear sets plus a splitter section.

A single gearshift lever is used to shift through a “progressive-H” shift pattern. In addition, an air-operated valve (with two selectors), mounted on the shift lever, is used to shift both the range gears and splitter gears in the compound. A plate-type synchronizer is used to range shift between the Hi-range and Lo-range gear sets.

ES (T300) series

T313 series transmission provides two reverse speeds, while the T318 series provides three reverse speeds. The reverse speeds are produced by the gear sets in the main case and by means of the Lo-range, Hi-range and splitter gearing in the compound case.

The T318 series transmission has 18 forward speeds produced by five forward gear sets in the main case (Lo, first, second, third and fourth), along with a splitter gear set and the Lo-range and Hi-range gear sets. With the Lo-range gear set in the compound selected, the five main case gear sets can be split shifted to obtain 10 forward speeds, starting with Lo gear. The main case Lo gear is used only when the compound is in Lo range and is not used in Hi range. To obtain eight additional forward speeds, the Hi-range gear set in the compound is selected and the main case gearshift lever positions of first through fourth are split shifted a second time, for a total of 18 forward speeds.

The T313 series transmission has 13 forward speeds produced by the same five gear sets (Lo, first, second, third and fourth) as the T318 series. The T313 series, however, is not split shifted while the compound is in the Lo-range. This provides five forward, Lo-split, Lo-range speeds. To obtain the remaining eight forward speeds, the compound Hi-range gear set is selected and the main case gearshift lever positions of first through fourth are repeated, only this time, split shifted for a total of 13 forward speeds. Refer to “T313(L)(LR)(21)(L21)(LR21) Shifting Instructions” on page 23 or “T318(L)(LR)(21)(L21)(LR21) Shifting Instructions” on page 24 for complete shifting procedure information.

The main case and the bell housing of both the 13- and the 18-speed transmissions are constructed of a one-piece casting, made from aluminum and heat-treated for strength.

The main case also has six- and eight-bolt openings that allow for the addition of Power Take-Off (PTO) units. PTO operation is off the countershaft fourth (8th) speed gear. The rear case has six- and eight-bolt openings also, to allow for additional PTO units. PTO operation is off the Hi-range/Hi-split gear.

Page 18

DESCRIPTION AND OPERATION

Provisions for Rear-Mounted Power Take-Off (RMPTO) units are available on these transmissions. The output speed (as a percentage of engine speed) of the RMPTO units, depends on which T300 transmission it is mounted on and is fixed at that percentage, regardless of which transmission gear is selected. The PTO speed to engine RPM percentage for the T313 and T318 series transmissions are all at 70 percent.

The bearings are housed in cast-iron bearing retainers (covers). Tapered roller bearings are used at each end of all transmission countershafts.

All gears are of the spur-type design and are in constant mesh with mating gears. All shifting is done by forks and sliding clutches. The shift rails and forks are integral with the shift cover for the main case.

The six countershafts, three in the main case and three in the rear case, are equally spaced around the mainshafts. This design distributes the load equally among the countershafts, thus keeping normal deflection and gear tooth loading to a minimum.

Lubrication

SPLASH LUBRICATION

All parts inside the transmission are lubricated by a splash-and-gravity system. To minimize churning, only the lower countershaft dips into the lubrication oil. As the gears on that countershaft spin, a constant spray of oil is directed to all internal parts of the transmission. The oil cools as it circulates over the aluminum case. Troughs and passages, cast into the inside of the case, capture and direct oil to the bearings.

Figure 9 — Splash Lubrication

Figure 8 — Equal Torque Distribution

Page 19

DESCRIPTION AND OPERATION

TRANSMISSION CASE OIL COOLER LINE PLUGS

An integral oil cooler pump system has been developed for MACK T300 series transmissions. The oil cooler is optional for engine ratings under 400 hp and chassis ratings under 80,000 GVW. The oil cooler system is required when the engine rating is equal to or exceeds 400 hp, or the chassis rating is greater than 80,000 GVW.

On T313/T318 series transmissions that are not built with oil cooler pump systems, the tube line openings are plugged or capped. The main suction tube area contains a metal plug and the outlet fitting area receives a plastic cap.

MAGNETIC OIL FILTER

A magnetic oil filter assembly is built into the right side of the main case. It consists of a magnetic plug which removes ferrous metallic particles from the passing oil. After passing the magnetic plug, the oil is channelled upward to an outlet, where it returns (by gravity) down into the transmission case sump. The magnetic plug is removable from the outside of the transmission, without the necessity of draining the oil since this plug is above the oil level. The drain plug at the bottom of the case is also magnetic.

Figure 10 — Transmission Case Oil Cooler Line Plugs

1. Outlet Plastic Cap 2. Suction Tube Plug

Figure 11 — Plug Locations

1. Magnetic Filter Plug

2. Oil Temperature Sensor

3. Oil Drain Plug

4. Oil Fill and Level Plug

Page 20

DESCRIPTION AND OPERATION

T313 Series Gear Ratios and Shift Pattern

Figure 12 — T313(L)(LR)(21)(L21)(LR21) Shift Pattern

T313(L)(LR)(21)(L21)(LR21) SHIFT PATTERN

Gear Position

(Main Box) Splitter Range T313(21)Ratios

Lo Lo Lo 13.44 16.42 16.42

1 Lo Lo 8.78 8.78 8.78

2 Lo Lo 6.28 6.28 6.28

3 Lo Lo 4.52 4.52 4.52

4 Lo Lo 3.22 3.22 3.22

Range Shift

5 Lo Hi 2.29 2.29 2.29

5 Hi Hi 1.94 1.94 1.94

6 Lo Hi 1.64 1.64 1.64

6 Hi Hi 1.39 1.39 1.39

7 Lo Hi 1.18 1.18 1.18

7 Hi Hi 1.00 1.00 1.00

8 Lo Hi 0.84 0.84 0.84

8 Hi Hi 0.71 0.71 0.71

Reverse

R Lo Lo 15.91 15.91 28.98

R Lo Hi 4.15 4.15 N/A

R Hi Hi 3.52 3.52 6.41

T313(L)(L21)

Ratios

T313(LR)(LR21)

Ratios

Page 21

DESCRIPTION AND OPERATION

T318 Series Gear Ratios and Shift Pattern

Figure 13 — T318(L)(LR)(21)(L21)(LR21) Shift Pattern

T318(L)(LR)(21)(L21)(LR21) SHIFT PATTERN

Gear Position

(Main Box) Splitter Range T318(21) Ratios

Lo Lo Lo 13.44 16.42 16.42

Lo Hi Lo 11.40 13.93 13.93

1 Lo Lo 8.78 8.78 8.78

1 Hi Lo 7.45 7.45 7.45

2 Lo Lo 6.28 6.28 6.28

2 Hi Lo 5.33 5.33 5.33

3 Lo Lo 4.52 4.52 4.52

3 Hi Lo 3.83 3.83 3.83

4 Lo Lo 3.22 3.22 3.22

4 Hi Lo 2.73 2.73 2.73

Range Shift

5 Lo Hi 2.29 2.29 2.29

5 Hi Hi 1.94 1.94 1.94

6 Lo Hi 1.64 1.64 1.64

6 Hi Hi 1.39 1.39 1.39

7 Lo Hi 1.18 1.18 1.18

7 Hi Hi 1.00 1.00 1.00

8 Lo Hi 0.84 0.84 0.84

8 Hi Hi 0.71 0.71 0.71

Reverse

R Lo Lo 15.91 15.91 28.98

R Hi Lo 13.49 13.49 24.58

R Lo Hi 4.15 4.15 N/A

R Hi Hi 3.52 3.52 6.41

T318(L)(L21)

Ratios

T318(LR)(LR21)

Ratios

Page 22

DESCRIPTION AND OPERATION

T313(L)(LR)(21)(L21)(LR21) Shifting Instructions

The shifting instructions in this Service Manual may have been upgraded and superseded due to Mack’s continuous program of testing and evaluating to provide the best possible product.

Be sure to check the latest shifting instructions found in the on-line Operator’s Handbooks located on the Mack website at www.macktrucks.com.

The T313 series transmission is a range and split shifted unit which has 12 forward gears with an extra Lo gear in the Lo range. It features an air-operated Lo range, Hi range and splitter section in the rear compound, controlled by a range selector and splitter selector on the shift lever. The Lo range provides five low ratios (includes Lo gear). In Hi range there are eight additional forward gears that can be obtained. Reverse gear can be used in Lo and Hi ranges for a total of two reverse speeds:

앫 Lo Range — Lo Split

앫 Hi Range — Hi Split

When making a split shift (from one gear to the next gear), the splitter selector must not be actuated, either up or down, until the main case is in neutral. When making a split shift (in the same gear), especially under heavy load, the splitter will not shift until driveline torque is relieved by depressing the clutch pedal or backing off the throttle. An audible shift is heard (engine speed drops approximately 200 rpm).

When making a range shift, it is important to preselect the shift. This means that the range selector must be moved to the next position (up or down) before the gearshift lever is moved. Preselect the range shift and then move the shift lever through neutral to the desired gear position. As the lever passes through neutral, the range shift is automatically completed.

UPSHIFTING (NORMAL HIGHWAY)

To begin, position the shift lever in neutral and move the range selector to the Hi position (a mechanical interlock prevents splitter selector movement to the Lo position). Next, select Lo split using the splitter selector. Then select Lo range using the range selector.

Refer to the shift pattern and move the shift lever to the Lo speed gear (Lo range, Lo split) position. Apply the accelerator, engage the clutch and accelerate to governed speed. Shift up through first, second, third and fourth speed gears, double-clutching between the gears.

Continue shifting while in fourth gear (Lo range, Lo split) by preselecting Hi range with the range selector and then moving the shift lever through neutral to the fifth gear position. As the lever moves through neutral, the range shift to Hi will be completed. The transmission is now in fifth gear (Hi range, Lo split). To continue, use a combination of splitter selector and shift lever to shift to fifth (Hi range, Hi split), sixth (Hi range, Lo split), sixth (Hi range, Hi split) and so on, until eighth (Hi range, Hi split) is achieved, double-clutching between the gears.

To upshift from Lo-split to Hi-split (in the same gear), accelerate the engine to governed speed, move the splitter switch to Hi (preselect), then depress the clutch and back off the accelerator pedal. Reapply the accelerator and engage the clutch when the audible shift is heard, or when the engine speed falls by approximately 200 rpm. Depressing the clutch may not be necessary to break the driveline torque, but this will vary with road conditions.

To upshift from a Hi-split gear to the next higher gear's Lo-split (in Hi-range), accelerate the engine to governed speed, break the driveline torque by depressing the clutch or backing off the accelerator pedal, then move the splitter switch to Lo and, at the same time, move shift lever through neutral to the next higher gear. Note that the splitter switch must not be actuated down to the Lo position until the main box is in neutral.

Page 23

DESCRIPTION AND OPERATION

DOWNSHIFTING (NORMAL HIGHWAY)

Shift from eighth (Hi range, Hi split) to eighth (Hi range, Lo split), then to seventh (Hi range, Hi split) to seventh (Hi range, Lo split) and so on, double-clutching between each gear until fifth (Hi range, Lo split) is reached.

While in fifth (Hi range, Lo split), preselect Lo range with the range selector and move the shift lever through neutral (range shift automatically occurs) to fourth (Lo range, Lo split). Then, continue using only the shift lever to shift down to third, second, first and so on.

To downshift from Hi split to Lo split (in same gear position), as engine speed falls, move the splitter switch to Lo split, release the accelerator and reapply it (audible shift should be heard). To downshift from Lo split in one gear to the next gear Hi split, move the shift lever into neutral, select Hi split, and move the shift lever to the next lower gear.

앫

Be careful not to overspeed the engine during downshifting. Damage to powertrain components may result.

앫

To avoid transmission damage, do NOT change range while moving in reverse gear.

앫

Make sure air pressure is at least 100 psi and unit is warmed before making range shifts.

T318(L)(LR)(21)(L21)(LR21) Shifting Instructions

The shifting instructions in this Service Manual may have been upgraded and superseded due to Mack’s continuous program of testing and evaluating to provide the best possible product.

Be sure to check the latest shifting instructions found in the on-line Operator’s Handbooks located on the Mack website at www.macktrucks.com.

The T318 series transmission is a range- and split-shifted unit that has 16 forward gears with two extra Lo gears in the Lo range (Lo split and Hi split). It features an air-operated Lo range, Hi range and splitter section in the rear compound, controlled by a range selector and splitter selector on the shift lever. The Lo range provides 10 low ratios (includes Lo gear — Lo split and Hi split). In Hi range there are eight additional forward gears that can be obtained. Reverse gear can be used in Lo and Hi ranges for a total of three reverse speeds:

앫 Lo Range — Lo Split

앫 Hi Range — Lo Split

앫 Hi Range — Hi Split

앫

Always start in Lo range per shift marker plate instructions. Never start higher than second (Lo range, Lo split) gear, including when dynamometer testing.

앫

With truck stationary, do not shift into Hi range and then move the truck. Damage to the synchronizer can result.

Page 24

When making a split shift (from one gear to the next gear), the splitter selector must not be actuated, either up or down, until the main case is in neutral. When making a split shift (in the same gear), especially under heavy load, the splitter will not shift until driveline torque is relieved by depressing the clutch pedal or backing off the throttle. An audible shift should be heard (engine speed drops approximately 200 rpm).

DESCRIPTION AND OPERATION

UPSHIFTING (NORMAL HIGHWAY)

To begin, position the shift lever in neutral and select Lo split using the splitter selector. Then select Lo range using the range selector.

Move the shift lever to the Lo-speed gear (Lo range, Lo split) position. Apply the accelerator, engage the clutch and accelerate to governed speed. Select Hi with the splitter selector and release the accelerator. Wait for the split shift to complete and then reapply the accelerator. Shift up through first (Lo range, Lo split), first (Lo range, Hi split), second (Lo range, Lo split), second (Lo range, Hi split) and so on, until fourth (Lo range, Hi split) is reached. Double-clutch between the gears.

Continue shifting while in fourth gear (Lo range, Hi split), move the range selector to Hi (preselect), select Lo on the splitter selector (preselect) and then move the gear shift to fifth (Hi range, Lo split). As the gear shift lever passes through neutral, the range shift to Hi and the split shift to Lo is completed. To continue, use a combination of splitter selector and shift lever to shift to fifth (Hi range, Hi split), sixth (Hi range, Lo split), sixth (Hi range, Hi split) and so on, until eighth (Hi range, Hi split) is achieved.

To upshift from Lo split to Hi split (in the same gear), accelerate the engine to governed speed, move the splitter switch to Hi (preselect), then depress the clutch and back off the accelerator pedal. Reapply the accelerator and engage the clutch when the audible shift is heard, or when the engine speed falls by approximately 200 rpm. Depressing the clutch may not be necessary to break the driveline torque, but this will vary with road conditions.

To upshift from a Hi-split gear to the next higher gear's Lo split (in Hi-range), accelerate the engine to governed speed, break the driveline torque by depressing the clutch or backing off the accelerator pedal, then move the splitter switch to Lo and, at the same time, move shift lever through neutral to the next higher gear. Note that the splitter switch must not be actuated down to the Lo position until the main box is in neutral.

DOWNSHIFTING (NORMAL HIGHWAY)

While in fifth (Hi range, Lo split), move the range selector to Lo (preselect), select Hi on the splitter selector (preselect) and then move the gear shift to fourth (Lo range, Hi split). As the gear shift lever passes through neutral, the range shift to Lo and the split shift to Hi is completed. Then, continue using the shift lever and splitter selector as described to shift down to Lo (Lo range, Lo split).

To downshift from Hi split to Lo split (in same gear position), as engine speed falls, preselect Lo split, release the accelerator and reapply it (audible shift should be heard). To downshift from Lo split in one gear to the next gear Hi split, move the shift lever into neutral, select Hi split, and move the shift lever to the next lower gear.

앫

Be careful not to overspeed the engine during downshifting. Damage to powertrain components may result.

앫

To avoid transmission damage, do NOT change range while moving in reverse gear.

앫

Make sure air pressure is at least 100 psi and unit is warmed before making range shifts.

앫

Always start in Lo range per shift marker plate instructions. Never start higher than second (Lo range, Lo split) gear, including when dynamometer testing.

앫

With truck stationary, do not shift into Hi range and then move the truck. Damage to the synchronizer can result.

Page 25

DESCRIPTION AND OPERATION

Guidelines for PTO Use

SIDE-MOUNTED PTO APPLICATION INFORMATION

For ease of PTO operation, and transmission and PTO reliability and durability, the recommended choice for PTO location is on either opening of the main case. Hydraulic pumps, product pumps, blowers and some mechanical winches, operate best when the PTO is located on the main case.

Properly engineered, direct-mount SAE-type splined pump drives, which eliminate PTO shafts and joints, should be bracket-mounted as close as possible to the rear engine supports. This reduces static and dynamic loads on components and support members.

Rear compound PTO openings are available for applications that require multi-speed capabilities, such as some mechanical winches, or units that require unique speeds or have multiple PTO requirements. To prevent transmission damage when using the rear compound PTO locations, use the following operating procedure.

DISENGAGING PTO

1. Depress the clutch pedal to disengage the clutch.

2. Move the shift lever to the neutral position.

3. Disengage the PTO.

4. Move the dash-mounted compound neutral control valve to the Off position. This moves the rear compound synchronizer clutch to the Lo range.

5. Move the shift lever to the desired main case gear ratio.

6. Release the parking brakes.

7. Release the clutch pedal to engage the clutch for vehicle operation, if desired.

Preferred Method for Engaging T313/T318 Series High Range Gear for Output Shaft Driven Power Take-Off Operation

METHOD NO. 1

After positioning the vehicle for power take-off operation, and with vehicle wheels off the ground:

PREFERRED OPERATING PROCEDURES FOR REAR COMPOUND-MOUNTED PTO APPLICATIONS

ENGAGING PTO

1. Select Lo split and Lo range, using the splitter and range selectors on the shift lever. (The transmission MUST be in Lo range and Lo split at all times during PTO operation.)

2. Depress the clutch pedal to disengage the clutch.

3. Set the parking brakes.

4. Move the shift lever to the neutral position.

5. Move the dash-mounted compound neutral control valve to the On position. This moves the rear compound synchronizer clutch to a neutral position.

6. Engage the PTO.

7. Move the shift lever to the desired main case gear ratio.

1. Shift the transmission to neutral.

2. Engage power take-off drive.

3. Move range selector to Hi range.

4. Disengage engine clutch and select reverse.

5. Feather the clutch until the transmission range clutch engagement is heard.

6. Disengage engine clutch.

7. Select “thirteenth” gear for T313 series or “eighteenth” gear for T318 series.

8. Engage clutch when power take-off operation is desired.

METHOD NO. 2

After positioning the vehicle for power take-off operation, and with vehicle wheels on the ground:

1. Shift the transmission to neutral.

2. Move range selector to Hi range.

3. Disengage engine clutch and select reverse.

8. Release the clutch pedal to engage the clutch.

9. Operate the PTO-driven load.

Page 26

4. Feather the clutch until the transmission range clutch engagement is heard.

5. Disengage engine clutch.

DESCRIPTION AND OPERATION

6. Engage power take-off drive.

7. Select “thirteenth” gear for T313 series or “eighteenth” gear for T318 series.

8. Engage clutch when power take-off operation is desired.

T313 Power Flow Diagrams

The following illustrations show power flow through the T313, T313L T313LR, T31321 T313L21 or T313LR21 transmission in each gear range (T313L shown).

Figure 16 — Second Speed (Lo Split, Lo Range)

Figure 14 — Lo Speed (Lo Split, Lo Range)

Figure 15 — First Speed (Lo Split, Lo Range)

Figure 17 — Third Speed (Lo Split, Lo Range)

Figure 18 — Fourth Speed (Lo Split, Lo Range)

Page 27

DESCRIPTION AND OPERATION

Figure 19 — Fifth Speed (Lo Split, Hi Range)

Figure 22 — Sixth Speed (Hi Split, Hi Range)

Figure 20 — Fifth Speed (Hi Split, HI Range)

Figure 21 — Sixth Speed (Lo Split, Hi Range)

Figure 23 — Seventh Speed (Lo Split, Hi Range)

Figure 24 — Seventh Speed (Hi Split, Hi Range)

Page 28

DESCRIPTION AND OPERATION

Figure 25 — Eighth Speed (Lo Split, Hi Range)

Figure 27 — Reverse Speed (Lo Split, Lo Range)

Figure 26 — Eighth Speed (Hi Split, Hi Range)

Figure 28 — Reverse Speed (Hi Split, Hi Range)

Page 29

DESCRIPTION AND OPERATION

T318 Power Flow Diagrams

The following illustrations show power flow through the T318, T318L, T318LR, T31821, T318L21 or T318LR21 transmission in each gear range (T318L shown).

Figure 29 — Lo Speed (Lo Split, Lo Range)

Figure 32 — First Speed (Hi Split, Lo Range)

Figure 30 — Lo Speed (Hi Split, Lo Range)

Figure 31 — First Speed (Lo Split, Lo Range)

Figure 33 — Second Speed (Lo Split, Lo Range)

Figure 34 — Second Speed (Hi Split, Lo Range)

Page 30

DESCRIPTION AND OPERATION

Figure 35 — Third Speed (Lo Split, Lo Range)

Figure 38 — Fourth Speed (Hi Split, Lo Range)

Figure 36 — Third Speed (Hi Split, Lo Range)

Figure 37 — Fourth Speed (Lo Split, Lo Range)

Figure 39 — Fifth Speed (Lo Split, Hi Range)

Figure 40 — Fifth Speed (Hi Split, Hi Range)

Page 31

DESCRIPTION AND OPERATION

Figure 41 — Sixth Speed (Lo Split, Hi Range)

Figure 44 — Seventh Speed (Hi Split, Hi Range)

Figure 42 — Sixth Speed (Hi Split, Hi Range)

Figure 43 — Seventh Speed (Lo Split, Hi Range)

Figure 45 — Eighth Speed (Lo Split, Hi Range)

Figure 46 — Eighth Speed (Hi Split, Hi Range)

Page 32

DESCRIPTION AND OPERATION

Figure 47 — Reverse Speed (Lo Split, Lo Range)

Figure 49 — Reverse Speed (Hi Split, Hi Range)

Figure 48 — Reverse Speed (Lo Split, Hi Range)

Page 33

NOTES

Page 34

COMPONENT LOCATOR

Page 35

COMPONENT LOCATOR

TRANSMISSION MAJOR COMPONENT LOCATIONS

Figure 50 — Major Component Locations for T313/T318 Transmission

1. Main Drive Pinion Assembly

2. Main Case Shift Cover Assembly

3. Range Shift Valve

4. Rear Case Shift Cover (Splitter) Assembly

5. Range Shift Cylinder Assembly

Page 36

6. Rear Mainshaft Bearing Cover

7. Rear Mainshaft and Synchronizer Assembly

8. Rear Countershaft Bearing Cover

9. Rear Countershaft Assembly

10. Front Countershaft Rear Bearing Cover

11. Reverse Idler Gear

12. Front Countershaft Assembly

13. Front Countershaft Front Bearing Cover

14. Front Mainshaft Assembly

COMPONENT LOCATOR

Figure 51 — Major Component Locations for T313L/T318L Transmission

1. Main Drive Pinion Assembly

2. Main Case Shift Cover Assembly

3. Range Shift Valve

4. Rear Case Shift Cover (Splitter) Assembly

5. Range Shift Cylinder

6. Rear Mainshaft Bearing Cover

7. Synchronizer Assembly

8. Rear Countershaft Bearing Cover

9. Rear Countershaft Assembly

10. Front Countershaft Rear Bearing Cover

11. Reverse Idler Gear

12. Front Countershaft Assembly

13. Front Countershaft Front Bearing Cover

14. Front Mainshaft Assembly

Page 37

COMPONENT LOCATOR

Figure 52 — Major Component Locations for T313LR/T318LR Transmission

1. Main Drive Pinion Assembly

2. Main Case Shift Cover Assembly

3. Range Shift Valve

4. Rear Case Shift Cover (Splitter) Assembly

5. Range Shift Cylinder

6. Rear Mainshaft Bearing Cover

7. Synchronizer Assembly

8. Rear Countershaft Bearing Cover

9. Rear Countershaft Assembly

10. Front Countershaft Rear Bearing Cover

11. Reverse Idler Gear

12. Low Reverse Gear

13. Front Countershaft Assembly

14. Front Countershaft Front Bearing Cover

15. Front Mainshaft Assembly

Page 38

COMPONENT LOCATOR

Figure 53 — Major Component Locations for T313L21/T318L21 Transmission

1. Main Drive Pinion Assembly

2. Main Case Shift Cover Assembly

3. Range Shift Valve

4. Rear Case Shift Cover (Splitter) Assembly

5. Range Shift Cylinder

6. Rear Output Housing (Extended Output Shaft)

7. Synchronizer Assembly

8. Rear Countershaft Bearing Cover

9. Rear Countershaft Assembly

10. Front Countershaft Rear Bearing Cover

11. Reverse Idler Gear

12. Front Countershaft Assembly

13. Front Countershaft Front Bearing Cover

14. Front Mainshaft Assembly

Page 39

COMPONENT LOCATOR

Figure 54 — Major Component Locations for T313LR21/T318LR21 Transmission

1. Main Drive Pinion Assembly

2. Main Case Shift Cover Assembly

3. Range Shift Valve

4. Rear Case Shift Cover (Splitter) Assembly

5. Range Shift Cylinder

Transmission Model Not Shown:

앫 T31321/T31821 Transmission

6. Rear Output Housing (Extended Output Shaft)

7. Synchronizer Assembly

8. Rear Countershaft Bearing Cover

9. Rear Countershaft Assembly

10. Front Countershaft Rear Bearing Cover

11. Reverse Idler Gear

12. Low Reverse Gear

13. Front Countershaft Assembly

14. Front Countershaft Front Bearing Cover

15. Front Mainshaft Assembly

Page 40

TROUBLESHOOTING

Page 41

TROUBLESHOOTING

TROUBLESHOOTING CHARTS

NOISY TRANSMISSION

Probable Cause Remedy

a. Low oil level a. Fill to correct level.

b. Wrong oil used b. Drain and refill with correct oil.

c. Mismatched carrier ratios c. Install correct matched gearing.

d. Resonating (ringing) driveshaft d. Install suitable dampening material, then high-speed

e. Side-mounted PTO mounted too loose or too tight e. Reinstall PTO correctly.

f. Loose bell housing to flywheel housing capscrews f. Install new capscrews using Loctite

g. Incorrect clutch-driven discs used g. Install correct clutch-driven discs.

h. Gears worn, chipped, rough, cracked h. Replace gears.

i. Bearings worn, cracked, corroded, galled, etc. i. Replace bearings.

j. Improperly adjusted fifth/sixth eccentric pin (SB-323-004) j. Adjust properly.

k. Driveline angles (air bags deflated) k. Correct driveline angles (allow air bags to fill).

HARD SHIFTING

balance the driveshaft.

Probable Cause Remedy

a. Incorrect driving practices a. Train driver in correct driving practices.

b. Low oil level b. Fill to correct level.

c. Improperly adjusted clutch, clutch linkage, clutch brake or

shift linkage

d. Wrong oil used d. Drain and refill with correct oil.

e. Remote shift linkage not lubricated e. Clean and lubricate.

f. Shift lever binding or interference f. Relieve binding or interference.

g. Poppet balls binding in their holes g. Clean holes and balls.

h. Loose setscrews in shifters or shift forks h. Tighten to correct torque.

i. Worn spigot bearing i. Replace bearing.

j. Clutch brake tangs broken j. Replace clutch brake.

k. Clutch discs worn into main drive pinion shaft splines k. Replace clutch discs and main drive pinion.

l. Mainshaft snap ring or thrust washer failure l. Replace snap rings or thrust washers.

m. PTO engaged m. Disengage PTO.

n. Improperly adjusted third/fourth eccentric pin

(SB-323-004)

c. Adjust properly.

n. Adjust properly.

Page 42

TROUBLESHOOTING

GEAR DISENGAGEMENT (JUMPING OUT OF GEAR)

Probable Cause Remedy

a. Excessive weight and/or length of gear shift lever and/or

knob

b. Shift lever interference b. Remove interference.

c. Improperly adjusted remote control linkage c. Adjust properly.

d. Worn or loose mounting insulators d. Replace insulators.

e. Loose, broken or missing capscrews between clutch

housing and flywheel housing

f. Weak or broken shifter rail poppet springs f. Replace springs.

g. Bent or worn shifter forks g. Replace forks.

h. Broken snap rings h. Replace snap rings.

i. Shift rail bent or poppet notches worn i. Replace shift rail.

j. Worn taper or chipped teeth on sliding clutch teeth j. Replace sliding clutch and mating gear if its clutch teeth

k. Worn or damaged spigot bearing k. Replace bearing.

l. Engine flywheel housing misalignment l. Realign properly.

m. Chassis resonant ride m. Correct resonance.

a. Replace with standard lever and/or knob.

e. Replace capscrews, check threads in case.

are damaged.

OIL LEAKS

Probable Cause Remedy

a. Oil level too high a. Drain to correct level.

b. Drain plug, fill plug or magnetic filter plug loose b. Tighten plugs.

c. Loose or missing capscrews c. Tighten or replace.

d. Improper lubricant used d. Drain and refill with correct oil.

e. Clogged air breather e. Clean or replace.

f. Gaskets or O-rings broken, shifted or squeezed out of

position

g. Worn oil seals g. Replace seals.

h. O-rings in air shift cylinder or cover leaking air pressure

into transmission

BEARING FAILURE

Probable Cause Remedy

a. Dirt in system a. Clean system, replace bearings as needed, flush and

b. Wrong grade of oil, or contaminated oil b. Clean system, replace bearings as needed, flush and

c. Excessive vibrations c. Eliminate vibrations, replace bearings.

d. Binding or seized propeller shaft slip yoke d. Clean and replace as needed.

e. Improper bearing clamping e. Replace bearings and re-clamp using correct procedures.

f. Improper bearing installation (preloads, etc.) f. Replace using correct procedures.

f. Replace gaskets or O-rings.

h. Replace O-rings.

refill with clean lubricant.

Page 43

TROUBLESHOOTING

AIR SHIFT MALFUNCTIONS

Probable Cause Remedy

a. Low system air pressure a. Wait for pressure to build back up to normal.

b. Restricted or clogged air filter in range shift valve b. Replace air filter.

c. Restricted air line (bent, squeezed, twisted, etc.) c. Re-route and/or replace air lines.

d. Air lines too small d. Replace with correct size air lines.

e. Defective O-rings in air shift cylinder e. Replace O-rings.

f. Scored air shift cylinders or pistons f. Repair or replace cylinders or pistons.

g. Defective range shift valve and/or air shift selector valve

(on shift lever)

h. Defective synchronizer h. Repair or replace as needed.

i. Range synchronizer friction discs worn or burned i. Replace synchronizer discs as needed.

j. Intermixed synchronizer parts j. Install matched parts.

g. Repair or replace as needed.

Page 44

MAINTENANCE

Page 45

MAINTENANCE

TRANSMISSION MAINTENANCE

Checking Oil Level

Perform oil level check when the oil is at operating temperature. The vehicle must be in a level position, both front-to-rear and side-to-side.

앫 Check the transmission oil level at the

intervals specified in the Maintenance and Lubrication Manual (TS494).

앫 To check the oil level in the transmission,

first remove the filler plug (2) from the right side of the main case (Figure 55).

Figure 56 — Correct Oil Level

앫 If oil can only be felt by reaching the finger

down into the unit, the oil level is too low.

Figure 55 — Oil Filler and Check Plug

1. Magnetic Filter Plug (Not for Level Check)

2. Oil Filler and Check Plug

앫 The oil must be level with the bottom of the

filler plug hole as determined by feel or by visual inspection.

Be careful not to burn your finger in hot gear oil when checking the oil level in the transmission.

Figure 57 — Incorrect Oil Level

앫 If needed, add specified make-up oil until the

oil is level with the bottom of the filler plug hole. Do NOT overfill. Use oil of the proper specification (refer to “Transmission Specifications and Capacities” on page

237).

앫 Reinstall and tighten the oil filler plug

(Figure 55) as follows:

1. Check that the O-ring on the plug is not cut or damaged.

2. Install the plug and tighten to 41–48 N•m (30–35 lb-ft) of torque.

DO NOT exceed 48 N•m (35 lb-ft) as plug can seize, resulting in damage to the transmission case when attempting to remove the plug.

Page 46

MAINTENANCE

Changing Oil

Preserve the environment! Drained gear oil is classified as a hazardous toxic material which must be recovered, handled, stored and disposed of according to applicable State or Federal guidelines.

CHANGE INTERVAL

앫 Change the oil at intervals specified in the

Maintenance and Lubrication Manual (TS494).

DRAINING OIL

앫 Before draining oil from the transmission, the

oil should be at normal operating temperature.

앫 Remove the magnetic drain plug (Figure 58)

from the bottom of the transmission main case and drain the hot oil into an industry-approved recovery container.

앫 Clean and replace the magnetic drain plug,

then torque plug to 34–41 N•m (25–30 lb-ft).

OIL FILL

앫 Remove the oil filler plug (2) (Figure 59),

then fill the transmission using specified oil until the oil is level with the bottom of the filler plug hole (also see Figure 56). Do NOT overfill.

MACK-approved lubricants can be found on the internet at www.macktrucks.com

, then click on

the PARTS AND SERVICE category.

앫 Reinstall and tighten the oil filler plug as

follows:

1. Check that the O-ring on the plug is not

cut or damaged.

2. Install the plug and tighten to

41–48 N•m (30–35 lb-ft) of torque.

DO NOT exceed 48 N•m (35 lb-ft) as plug can seize, resulting in damage to the transmission case when attempting to remove the plug.

Figure 58 — Plug Locations

1. Magnetic Filter Plug

2. Oil Temperature Sensor

Figure 59 — Oil Filler and Check Plug

1. Not for Oil Fill 2. Oil Filler and Check Plug

3. Oil Drain Plug

4. Oil Fill and Level Plug

Page 47

MAINTENANCE

Be sure to add oil to the transmission through the filler hole, NOT the magnetic filter plug hole. Damage to the transmission and seals may occur due to overfilling. The magnetic oil filter hole is higher on the transmission case than the filler hole.

Magnetic Oil Filter Plug

Remove the magnetic oil filter plug and clean the magnet in the plug every time the oil is changed. Reinstall the magnetic plug. Tighten the plug to 27–31 N•m (20–23 lb-ft) torque.

Air Breather(s)

The T313–T318(L)(LR)(21)(L21)(LR21) transmissions have one air breather, located on the main case shift cover. The air breather should be removed and cleaned with a suitable solvent every time the oil is changed. Also check to be sure that airflow through the breather is unobstructed. Reinstall breather into the main case shift cover and tighten until snug.

Figure 60 — Shift Cylinder Breather Vent Shown

Removed (1) and Installed (2)

The optional three-position (compound neutralizing) range shift cylinder contains a breather vent screen which should be cleaned any time the main case shift cover is cleaned. The following figure shows the breather vent removed (1) and installed (2). Check the breather vent for free airflow. Clean or replace as necessary.

Page 48

REPAIR INSTRUCTIONS

Page 49

REPAIR INSTRUCTIONS

TRANSMISSION DISASSEMBLY PROCEDURES

[320]

Unless a complete overhaul is necessary, remove only those parts required to gain access to faulty parts. Do not disturb parts with a heavy press fit (interference fit) unless replacement is necessary. When replacement is necessary, use proper press setups and pullers so that usable parts are not damaged.

Lift and move the transmission with a hoist, using the two lifting brackets provided.

2. Remove the clutch release bearing assembly, shafts, yoke and clutch brake (if equipped).

3. Disconnect the air lines attached to the range shift cylinder, rear case shift cover (splitter) and range shift valve. Air lines are installed using a push/pull-type fitting and are best removed using tool kit 9032-1800trk which can be obtained through the MACK Parts System. Disconnect the air lines using the following procedure:

External inspection of the unit before cleaning and disassembly often reveals information about existing operating conditions. This may help when diagnosing problems.

During disassembly, remember the sequence in which components and individual parts are removed from the transmission. It is good practice to keep related parts together in groups when removed. Small parts such as shims and spacers can be wired to the larger pieces they go with. Groups of parts can be kept together in boxes.

Keep parts such as shim packs, bearing cones, bearing retainers (covers), bearing cups and gears with the original countershaft from which they are removed. Mark each countershaft and bearing cover before removal. Mark the upper left front and rear countershafts and bearing covers (viewed from rear) as number 1. Mark the upper right front and rear countershafts and bearing covers (viewed from rear) as number 2. Mark the lower front and rear countershafts and bearing covers as number 3.

a. Select the appropriate size release tool

from kit 9032-1800trk.

b. Insert the tool over the air line and

release the lines from the fittings by pushing in toward the fitting and at the

1. Air Line Removal Tool

9032-1800trk

same time, pulling on the hose.

Figure 61 — Removing Air Lines

2. Air Hose Fitting Release Ferrule

1. Clean the transmission externally and mount it in an overhaul stand. Drain the lubricant and plug any air line openings to prevent dirt from entering.

Page 50

4. Label the air lines for proper reassembly.

REPAIR INSTRUCTIONS

5. Remove the range shift valve 5/32-inch Allen

screws (outer) and capscrews (inner), using the appropriate tools.

Figure 62 — Removing Range Shift Valve Screws (Air

Lines Removed for Clarity)

6. Remove the range shift interlock sleeve,

spring, pin and O-ring from the main case shift cover.

7. Remove the range shift valve, dual-double check valve, pressure switch and associated brackets from the transmission.

8. Leave all air lines and valves connected. Then remove the valves and air lines as an assembly.

Figure 64 — Removing Air Lines and Valves

9. With the transmission in neutral, remove the main case shift cover capscrews.

Figure 63 — Removing Range Shift Valve

1. Range Shift Valve (Reference)

2. O-Ring

3. Interlock Sleeve

4. Interlock Spring

5. Interlock Pin

6. Main Case Shift Cover

Figure 65 — Removing Main Case Shift Cover

Capscrews

Page 51

REPAIR INSTRUCTIONS

10. Remove the main case shift cover assembly and cover gasket.

Figure 66 — Removing Main Case Shift Cover

11. Remove the rear case shift cover capscrews.

14. Reach into the main case top opening and move at least two sliding clutches into engagement. This locks two different gears to the mainshaft and prevents the gears and shaft of the transmission from rotating.

15. Remove the drive yoke nut from the extended output shaft.

Figure 68 — Removing Drive Yoke Nut

(T313L21/T318L21 Shown)

Figure 67 — Removing Rear Case Shift Cover

Capscrews

12. Remove the rear case shift cover and gasket.

To remove the drive yoke nut (extended output shaft) or yoke (or flange), clamp plate bolt and clamp plate (conventional output shaft), place at least two gears in both the main case and the rear case into engagement. This is done to lock the transmission gearing and prevent it from rotating while removing the yoke bolt or nut.

13. Reach through the rear case top opening and verify that both the splitter sliding clutch and the synchronizer assembly sliding clutch are engaged.

16. Remove the drive yoke or drive flange capscrew and clamp plate from the conventional output shaft.

Effective June 2007, drive yoke clamp plate capscrews were changed to a Scotch-Grip™ torque retention method. DO NOT reuse these fasteners, as they are one-time use only.

Figure 69 — Removing Clamp Plate and Capscrew

(T313L/T318L Shown)

Page 52

REPAIR INSTRUCTIONS

17. Remove the drive yoke or drive flange, using a suitable puller such as J 07804-A or equivalent.

Figure 70 — Removing Drive Yoke (T313L/T318L Shown)

18. Shift the transmission gears into neutral. Verify that the transmission is in neutral.

19. Reach inside the rear case opening and remove the range shift fork setscrew.

20. Remove the range shift cylinder capscrews.

Figure 72 — Removing Range Shift Cylinder Capscrews

21. Remove the range shift cylinder cover and O-ring, and set aside.

Effective June 2007, shift fork setscrews were changed to a Scotch-Grip™ torque retention method. DO NOT reuse these fasteners, as they are one-time use only.

Figure 73 — Removing Range Shift Cylinder Cover

Figure 71 — Removing Range Shift Fork Setscrew

Page 53

REPAIR INSTRUCTIONS

Figure 74 — Removing Range Shift Cylinder O-Ring

22. While holding the shift fork, slide the shift cylinder from the rear of the transmission.

23. For transmission models with the two-position range shift cylinder (non-neutralizing), also remove the gasket as shown in Figure 76.

Figure 76 — Two-Position Shift Cylinder Gasket

24. Remove the range shift fork from the rear case. Note the offset of the range shift fork. Straight side of the fork faces the front; angled side of fork faces the rear.

To help remove the shift cylinder, use a plastic mallet to lightly tap on the piston to loosen the shift rail from the fork.

Figure 75 — Removing Range Shift Cylinder

Figure 77 — Shift Fork Offset

Page 54

REPAIR INSTRUCTIONS

25. Position the transmission vertically, rear end up.

26. Remove the rear output housing oil seal on the extended output housing transmission: T313–T318(21)(L21)(LR21).

Figure 78 — Removing Output Housing Oil Seal for

T313L21/T318L21 Series

27. On the extended output housing transmissions: T313–T318(21)(L21)(LR21), remove the rear output housing capscrews. Remove the jackscrew plugs from the housing.

28. Using jackscrews, separate the output housing from the rear case on extended output housing transmissions.

Figure 80 — Separating Output Housing from Case

(T313L21/T318L21 Shown)

29. Remove the output housing along with the outer bearing cone and bearing preload collapsible spacer.

Figure 79 — Removing Extended Output Housing

Capscrews (T313L21/T318L21 Shown)

Figure 81 — Removing Output Housing, Bearing Cone

and Spacer (T313L21/T318L21 Shown)

Page 55

REPAIR INSTRUCTIONS

30. On the conventional output shaft model transmissions: T313–T318(L)(LR), remove the capscrews from the rear mainshaft bearing cover.

Figure 82 — Removing Rear Mainshaft Bearing Cover

Capscrews

31. For the conventional output shaft model transmissions: T313–T318(L)(LR), remove the rear mainshaft bearing cover. Jackscrew holes are provided to assist in removal.

Figure 84 — Rear Mainshaft Bearing Cover Removed

32. Remove the output housing gasket from either the housing or the case as needed.

33. Number the front countershaft front bearing covers and the rear countershaft bearing covers, using a grease pencil. Write number 1 on the upper right front cover (viewed from front), number 2 on the upper left front cover (viewed from front) and number 3 on the lower front cover. Write number 1 on the upper left rear cover (viewed from rear), number 2 on the upper right rear cover (viewed from rear) and number 3 on the lower rear cover.

Figure 83 — Removing Rear Mainshaft Bearing Cover

Using Jackscrews

Page 56

Figure 85 — Mark Front Countershaft Front Bearing

Covers for Placement

REPAIR INSTRUCTIONS

Figure 86 — Mark Rear Countershaft Bearing Covers for

Placement

34. Remove all of the rear countershaft bearing cover capscrews.

35. Remove the jackscrew plugs from the covers.

Figure 88 — Removing Jackscrew Plugs

Pry the plugs loose using a thin knife-edge or similar tool. Do not cut through plugs during removal. Save for reuse or replace if necessary.

Figure 87 — Removing Rear Countershaft Bearing Cover

Capscrews

36. Remove the rear countershaft bearing covers, shims and O-rings. Jackscrew holes are provided to assist removal.

Figure 89 — Removing Bearing Cover

Page 57

REPAIR INSTRUCTIONS

37. Mark the rear countershafts so they can be installed in the same position during reassembly.

Figure 90 — Marking Rear Countershafts

(T313L21/T318L21 Shown)

38. Place the transmission in a vertical position (rear case upward), and remove the two capscrews located inside the rear case.

39. Remove all of the remaining capscrews and dowel bolts that hold the rear case to the main case.

Tap dowel bolts out of the rear case using a brass hammer or a combination of a brass hammer and a steel hammer as long as contact is made with the brass hammer only.

When separating the rear case from the front case, make sure the transmission is in the vertical position. The rear countershafts are not supported when the case is removed. They can fall out and cause damage or personal injury.

Figure 91 — Removing Outer Rear Case-to-Main Case

Capscrews

Figure 92 — Removing Inner Rear Case-to-Main Case

Capscrews

Figure 93 — Removing Dowel Bolts

Page 58

REPAIR INSTRUCTIONS

Be sure unit is vertical, so that the countershafts will not fall out when the case is removed.

40. Using a hoist and chain, remove the rear case from the main case. Only the rear case should be lifted, not the output assembly. If necessary, tap on the end of the output shaft to loosen it from the case. Lift only the case, not the compound gear set or mainshaft and synchronizer assembly.

41. For the extended output shaft transmissions: T313–T318(21)(L21)(LR21), using a hoist and suitable output yoke retaining nut with welded strap, lift and remove the synchronizer and output shaft assembly.

Figure 94 — Removing Rear Case (T313L/T318L Shown)

Figure 95 — Removing Mainshaft and Synchronizer

Assembly (T313L21/T318L21 Shown)

Page 59

REPAIR INSTRUCTIONS

42. On the conventional output shafted transmissions: T313–T318(L)(LR), use a hoist and a threaded eye-bolt to lift and remove the mainshaft and synchronizer assembly from the rear case.

Remember to mark the countershafts so they can be installed in the same position during reassembly. Also, notice the gear timing marks. Countershaft gear timing should be marked in alignment with the countershaft keyway.

Figure 96 — Removing Mainshaft and Synchronizer

Assembly (T313L/T318L Shown)

1. Timing Marks

43. Remove the three compound countershafts from the rear of the transmission.

44. If not already done, mark the rear countershafts so that they can be installed in the same location during installation.

Figure 97 — Removing Compound Countershafts

(T313L/T318L Shown)

1. Timing Marks

45. Remove the splitter sliding clutch from the rear of the front mainshaft.

Figure 98 — Removing Splitter Sliding Clutch

Page 60

REPAIR INSTRUCTIONS

46. Remove the compound Lo-split gear snap ring using snap ring plier set J 34629 or suitable, internal-toothed thrust washer and Lo-split gear from the mainshaft.

To help in removing the compound Lo-split gear snap ring, use a pry bar to lift the front mainshaft slightly during removal. This allows more clearance and frees the snap ring from the snap ring groove.

47. Remove the No. 2 (upper right) front countershaft rear bearing cover capscrews.

48. Using jackscrews, remove the No. 2 (upper right) front countershaft rear bearing cover.

100

Figure 100 — Removing No. 2 Front Countershaft Rear

Bearing Cover (T313L/T318L Shown)

49. Remove the capscrews from the front of the mainshaft rear bearing cover. Then remove the cover.

101

Figure 99 — Removing Snap Ring, Thrust Washer and

Lo-Split Gear (T313L/T318L Shown)

1. Lo-Split Gear

2. Internal-Toothed Thrust Washe r

3. Snap Ring Groove

If not already done, mark the front countershaft rear bearing covers so they can be installed in the same position during reassembly.

Figure 101 — Removing Mainshaft Rear Bearing Cover

Capscrews (T313L/T318L Shown)

Page 61

REPAIR INSTRUCTIONS

50. Remove the front mainshaft snap ring next to the rear bearing.

102

Figure 102 — Removing Rear Bearing Snap Ring

52. Press the sleeve out of the mainshaft rear bearing.

104

Figure 104 — Pressing Sleeve Out of Bearing

51. Remove the front mainshaft rear bearing from the case.

103

Figure 103 — Removing Front Mainshaft Rear Bearing

(T313L/T318L Shown)

Page 62

REPAIR INSTRUCTIONS

53. Remove the front mainshaft rear bearing spacer and spacer snap ring from the mainshaft.

105

54. Remove the snap ring from inside the reverse speed gear, using suitable snap ring pliers.

106

Figure 105 — Removing Front Mainshaft Spacer and

Snap Ring (T313L/T318L Shown)

Figure 106 — Removing Snap Ring from Inside Reverse

Speed Gear (T313L/T318L Shown)

1. Reverse Gear 2. Reverse Gear Snap Ring

Page 63

REPAIR INSTRUCTIONS

55. Remove the external-toothed and internal-toothed thrust washers from inside the reverse speed gear. Then remove the reverse gear mainshaft snap ring, using suitable snap ring pliers.

107

108

Figure 108 — Removing Internal-Toothed Thrust Washer

and Snap Ring (T313L/T318L Shown)

1. Internal-Toothed Thrust Washer

2. Reverse Gear Snap Ring

56. Position the transmission case horizontally. Remove the main drive pinion bearing cover capscrews.

109

Figure 107 — Removing External- and Internal-Toothed

1. Internal-Toothed Thrust Washe r

Thrust Washers

2. External-Toothed Thrust Washer

Figure 109 — Removing Pinion Bearing Cover

Capscrews

Page 64

REPAIR INSTRUCTIONS

57. Remove the main drive pinion assembly. Jackscrew holes are provided to assist in removal.

58. Remove main drive pinion assembly from the case.

110

Figure 110 — Use Jackscrews to Remove Main Drive

Pinion Assembly

112

Figure 112 — Removing Main Drive Pinion Assembly

59. Remove the third/fourth (7th/8th) sliding clutch.

113

On transmissions built with oil cooler circulation pumps, the oil pump discharge line must be removed before the main drive pinion assembly can be removed.

111

Figure 111 — Oil Pump Discharge Line (if Equipped)

1. Oil Pump Discharge Line

Figure 113 — Removing Sliding Clutch

60. Using a soft mallet, drive the mainshaft forward in the case to free the mainshaft gears from the countershafts.

61. Remove the No. 2 (upper right) countershaft from the case by lifting the front end off the front bearing cone and then sliding the countershaft through the opening.

Removal is easier if the transmission is in the vertical position.

Page 65

REPAIR INSTRUCTIONS

114

Figure 114 — Removing No. 2 Countershaft from

Transmission Case

62. Remove the No. 2 (upper left) front countershaft front bearing cover capscrews.

115

63. Using jackscrews, remove the No. 2 (upper left) front countershaft front bearing cover.

116

Figure 116 — Removing No. 2 Front Countershaft Front

Bearing Cover

117

Figure 115 — Removing No. 2 Front Countershaft Front

Bearing Cover Capscrews

Page 66

Figure 117 — No. 2 Front Countershaft Front Bearing

Cover Removed

REPAIR INSTRUCTIONS

64. Using tool J 34630 or a slide hammer, remove the upper right reverse idler shaft (next to No. 2 countershaft location). To prevent damage to the reverse idler gear, catch the gear as it separates from the shaft.

118

Figure 118 — Using Tool J 34630 to Remove Reverse

Idler Shaft

119

120

Figure 120 — Sliding Reverse Gear and Lo/Reverse

Clutch Forward

69. Using a pry bar, move the rear end of the No. 1 (upper left) countershaft away from the mainshaft as far as possible without damaging the bearing. Block the countershaft in this position, using wadding made from rags.

121

Figure 119 — Removing Reverse Idler Gear and Shaft

65. Remove the No. 1 (upper left) front countershaft rear bearing cover capscrews.

66. Remove the No. 1 (upper left) front countershaft rear bearing cover, using jackscrews. Remove shims with cover.

67. Using tool J 34630 or slide hammer, remove the upper left reverse idler shaft (next to No. 1 countershaft). To prevent damage to the reverse idler gear, catch the gear as it separates from the shaft.

68. From the top of the case, slide the mainshaft reverse gear and Lo/reverse sliding clutch forward toward the front of the transmission.

Figure 121 — Moving and Blocking No. 1 (Upper Left)

Countershaft Away from Mainshaft

70. Tip the front end of the mainshaft outward and remove it from the case.

Be careful when handling the mainshaft assembly, the reverse gear is free on the shaft and can fall off during handling.

Page 67

REPAIR INSTRUCTIONS

122

Figure 122 — Removing the Mainshaft

71. Remove the No. 3 (lower) front countershaft rear bearing cover capscrews.

72. Remove the No. 3 (lower) front countershaft rear bearing cover, using jackscrews. Remove shims with cover.

73. Using tool J 34630 or a slide hammer, remove the lower reverse idler shaft (next to No. 3 countershaft). To prevent damage to the reverse idler gear, catch the gear as it separates from the shaft.

75. Remove the No. 3 (lower) countershaft by pulling and tilting the front end of the shaft upward.

124

Figure 124 — Removing No. 3 Lower Countershaft

76. Remove the remaining No. 1 (upper right, viewed from front) and No. 3 (lower) front countershaft front bearing cover capscrews and bearing covers. Use jackscrews to remove the covers.

125

74. Remove the No. 1 (upper left) front countershaft by pulling and tilting the front end of the shaft upward.

123

Figure 123 — Removing No. 1 Upper Left Countershaft

Figure 125 — Remaining No. 1 and No. 3 Front

Countershaft Bearing Covers

Page 68

REPAIR INSTRUCTIONS

TRANSMISSION COMPONENT DISASSEMBLY

[320]

Unless a complete overhaul is necessary, remove only the parts that are required to repair the assembly. Do not disturb parts that have a heavy press fit (interference fit) unless replacement of the part is necessary. When replacement is necessary, use proper pullers and press setups to prevent damage to usable parts.

Main Case Shift Cover Disassembly

[323]

126

127

Figure 127 — Shift Cover Assembly

Figure 126 — Main Case Shift Cover Component Locator

(T313L/T318L Shown)

Page 69

128

REPAIR INSTRUCTIONS

1. Third/Four th Shift Fork

2. First/Second Shift Fork

3. Lo/Reverse Shifter

4. Shifter Body Spring (Interlock)

5. Shifter Body Plunger (Interlock)

6. Lo/Reverse Shift Fork

7. Third/Four th Shifter

8. Third/Fourth Rocker Pin

9. Washer

10. Third/Fourth Rocker Arm

11. Bushing

Page 70

Figure 128 — Exploded View of Main Case Shift Cover

12. Washer

13. Interlock Pin

14. Poppet Ball

15. Poppet Ball Spring

16. Interlock Rocker Hardware

17. Interlock Sleeve and O-Ring

18. Interlock Spring

19. Third/Fourth Rocker Pin Hardware

20. Interlock Rocker

21. Interlock Rocker Bolt

22. Pipe Plug

23. Breather

24. Interlock Pin

25. Interlock Ball

26. Lo/Reverse Shift Rail

27. First/Second Shift Rail

28. Interlock Ball

29. Interlock Pin

30. Interlock Ball

31. Third/Fourth Shift Rail

32. Lo/Reverse Shifter Ball

33. Lo/Reverse Shifter Spring

REPAIR INSTRUCTIONS

1. Remove the nut and washers from the

interlock rocker bolt.

129

Figure 129 — Remove Nut and Washers

3. Remove the interlock ball from the cover.

131

Figure 131 — Remove Interlock Ball from Cover

2. Remove the interlock rocker and bolt from

the cover.

130

Figure 130 — Remove Interlock Rocker and Bolt

Page 71

REPAIR INSTRUCTIONS

4. Remove the setscrew from the Lo/reverse shift fork.

Effective June 2007, shift fork setscrews were changed to a Scotch-Grip™ torque retention method. DO NOT reuse these fasteners, as they are one-time use only.

132

5. Remove the setscrew from the Lo/reverse shifter.

Effective June 2007, shift fork setscrews were changed to a Scotch-Grip™ torque retention method. DO NOT reuse these fasteners, as they are one-time use only.

133

Figure 132 — Removing Setscrew from Lo/Reverse Shift

Fork

Page 72

Figure 133 — Removing Setscrew from Lo/Reverse

Shifter

REPAIR INSTRUCTIONS

6. Slide the Lo/reverse shift rail to the left and remove the interlock pin.

134

7. Remove the Lo/reverse shift fork from the cover.

135

Figure 134 — Sliding Lo/Reverse Shift Rail

Figure 135 — Removing Lo/Reverse Shift Fork

Page 73

REPAIR INSTRUCTIONS

8. Push the Lo/reverse shift rail forward, using a metal bar or large screwdriver. Hold a shop towel over the top opening. The shop towel prevents the spring and ball under the rail from popping out and becoming lost.

Poppet balls are spring loaded and may cause injury when released.

136

9. Remove the poppet ball and spring from the Lo/reverse shift rail vertical pocket in line with the rail.

A magnet is helpful in removing the poppet ball and spring.

137

Figure 136 — Pushing Lo/Reverse Shift Rail Forward

Page 74

Figure 137 — Removing Poppet Ball and Spring

REPAIR INSTRUCTIONS

10. Remove the interlock ball from the horizontal pocket between the Lo/reverse shift rail and the first/second shift rail.

138

11. Continue sliding the Lo/reverse shift rail forward to remove the Lo/reverse shifter.

139

Figure 138 — Removing Interlock Ball

Figure 139 — Removing Lo/Reverse Shifter

Page 75

REPAIR INSTRUCTIONS

12. Slide the Lo/reverse shift rail from the shift cover and at the same time, remove the third/fourth shift fork.

140

13. Remove the setscrew from the first/second shift fork.

Effective June 2007, shift fork setscrews were changed to a Scotch-Grip™ torque retention method. DO NOT reuse these fasteners, as they are one-time use only.

141

Figure 140 — Removing Third/Fourth Shift Fork

Figure 141 — Removing Setscrew from First/Second

Shift Fork

Page 76

REPAIR INSTRUCTIONS

14. Push the first/second shift rail forward using a metal bar or large screwdriver. Hold a shop towel over the top opening. The shop towel prevents the spring and ball under the rail from popping out and becoming lost.

Poppet balls are spring loaded and can cause injury when they are released.

142

15. Remove the poppet ball and spring from the first/second shift rail vertical pocket in line with the rail.

A magnet is helpful in removing the poppet ball and spring.

143

Figure 142 — Pushing First/Second Shift Rail Forward

Figure 143 — Removing Poppet Ball and Spring

Page 77

REPAIR INSTRUCTIONS

16. Remove the interlock ball from the horizontal pocket between the first/second shift rail and the third/fourth shift rail.

144

17. Remove the interlock pin from the first/second shift rail.

145

Figure 144 — Removing Interlock Ball

Figure 145 — Removing Interlock Pin

Page 78

REPAIR INSTRUCTIONS

18. Slide the first/second shift rail further forward and remove the first/second shift fork.

146

20. Remove the setscrew from the third/fourth shifter.

Effective June 2007, shift fork setscrews were changed to a Scotch-Grip™ torque retention method. DO NOT reuse these fasteners, as they are one-time use only.

148

Figure 146 — Removing First/Second Shift Fork

19. Continue sliding the first/second shift rail until it clears the cover.

147

Figure 147 — Removing First/Second Shift Rail

Figure 148 — Removing Setscrew from Third/Fourth

Shifter

Page 79

REPAIR INSTRUCTIONS

21. Push the third/fourth shift rail forward, using a metal bar or large screwdriver. Hold a shop towel over the top opening. The shop towel prevents the spring and ball under the rail from popping out and becoming lost.

Poppet balls are spring loaded and can cause injury when they are released.

149

22. Continue sliding the third/fourth shift rail forward out of the shift cover. At the same time, remove the third/fourth shifter.

150

Figure 149 — Pushing Third/Fourth Shift Rail Forward

Figure 150 — Removing Third/Fourth Shifter

Page 80

REPAIR INSTRUCTIONS

23. Remove the poppet ball and spring from under the third/fourth shift rail.

A magnet is helpful in removing the poppet ball and spring.

151

24. Remove the poppet ball and spring and interlock plunger and spring from the Lo/reverse shifter.

152

Figure 152 — Lo/Reverse Shifter Disassembled

25. Remove the reverse light switch from the shift cover.

153

Figure 151 — Removing Poppet Ball and Spring

Figure 153 — Removing Reverse Light Switch

Page 81

REPAIR INSTRUCTIONS

26. Remove the reverse light switch rod.

154

27. Remove the nut and washers from the third/fourth rocker pin.

155

Figure 154 — Removing Reverse Light Switch Rod

Figure 155 — Loosening Third/Fourth Rocker Pin Nut

Page 82

REPAIR INSTRUCTIONS

156

28. Remove the third/fourth rocker pin and rocker arm.

157

Figure 156 — Recovering the Lock Washer, Flat Washer

and Nut

Figure 157 — Removing Third/Fourth Rocker Pin and

Rocker Arm

29. Remove the shift cover breather vent.

158

Figure 158 — Removing Breather Vent

Page 83

REPAIR INSTRUCTIONS

Rear Case Shift Cover Disassembly

[324]

159

Figure 159 — Rear Case Shift Cover Component Locator

160

(T313L/T318L Shown)

1. Remove the setscrew that secures the shift fork to the shift piston.

Effective June 2007, shift fork setscrews were changed to a Scotch-Grip™ torque retention method. DO NOT reuse these fasteners, as they are one-time use only.

161

Figure 160 — Exploded View of Rear Case Shift Cover

1. Cover O-Ring

2. Piston O-Ring

3. Splitter Shift Piston

4. Capscrew (10)

5. Rear Case Shift Cover

6. Gasket

7. Shift Fork Setscrew

8. Splitter Shift Fork

9. Capscrew (4)

10. Piston Cover

11. Shaft O-Ring

Figure 161 — Removing Setscrew

2. Remove the piston cover capscrews and shift piston cover.

162

Figure 162 — Removing Cover Capscrews

Page 84

REPAIR INSTRUCTIONS

3. Slide the shift piston out of the housing and at the same time, remove the shift fork. Note the orientation of the shift fork; the offset faces forward.

163

5. Remove the O-ring (that seals the shaft of the piston) from the rear of the shift piston housing.

165

Figure 165 — Removing O-Ring from Rear of Housing

6. Remove the O-ring located on the shift piston.

166

Figure 163 — Removing Piston and Shift Fork

4. Remove the piston cover O-ring from the housing of the shift cover.

164

Figure 164 — Removing Piston Cover O-Ring

Figure 166 — Removing Piston O-Ring

Page 85

REPAIR INSTRUCTIONS

Three-Position Range Shift Cylinder Disassembly (Compound Neutralizing)

[324]

167

Figure 167 — Range Shift Cylinder Component Locator

(T313L/T318L Shown)

168

1. With the range shift cylinder in hand, tap the end of the piston shift rail on a firm surface to remove the piston assembly.

169

Figure 169 — Piston Assembly Partially Removed

2. Remove the sleeve from the shift piston.

170

Figure 168 — Cutaway View of Range Shift Cylinder

1. Shift Fork

2. Rail

3. O-Ring

4. Shift Piston

5. O-Ring

6. Piston Sleeve

7. Shift Cylinder

8. O-Ring

Page 86

9. Shift Cylinder Cover

10. Piston/Rail Nut

11. O-Ring

12. Cover Capscrew

13. O-Ring

14. Breather Vent

15. O-Ring

16. O-Ring

Figure 170 — Removing Sleeve from Piston

3. Remove the shift piston and rail assembly from the range shift cylinder.

4. Remove the O-ring from the outside front end of the shift cylinder. Also remove the shift rail O-ring located inside the cylinder, using a pick or suitable tool.

REPAIR INSTRUCTIONS

171

Figure 171 — Removing Shift Cylinder Outside O-Ring

172

6. Remove the front O-ring at the shift rail end of the piston.

174

Figure 174 — Removing O-Ring from Front of Piston

7. Remove the nut securing the shift piston to the shift rail. Then separate rail and piston.

Figure 172 — Removing Shift Cylinder Inside O-Ring

5. Remove the O-ring from the rear of the shift piston.

173

Do not clamp the shift piston or shift rail in a vise. This can cause damage to the piston or rail, preventing proper shifting.

To prevent damage to the shift rail or piston when removing the nut, temporarily install the shift fork and tighten the setscrew. This provides leverage for loosening the nut.

175

Figure 173 — Removing O-Ring from Rear of Piston

Figure 175 — Removing Shift Piston Retaining Nut

Page 87

REPAIR INSTRUCTIONS

8. Remove the O-ring located on the shift rail.

176

Figure 176 — Removing Shift Rail O-Ring

9. Remove the O-ring from the piston sleeve.

177

10. The following figure shows the breather vent removed (1) and installed (2). Check the breather vent for free airflow. Clean or replace, if necessary.

178

Figure 177 — Removing O-Ring from Sleeve

Figure 178 — Shift Cylinder Breather Vent Shown

Removed (1) and Installed (2)

Page 88

REPAIR INSTRUCTIONS

Two-Position Range Shift Cylinder Disassembly (Compound Non-Neutralizing)

[324]

179

Figure 179 — Range Shift Cylinder Component Locator

(T313L/T318L Shown)

180

1. With the range shift cylinder in hand, tap the end of the piston shift rail on a firm surface to begin removal of the piston/shift rail assembly.

181

Figure 181 — Piston Assembly Partially Removed

2. Continue moving the piston/shift rail out of the cylinder housing to completely separate the piston/shift rail from the housing.

3. Using a small screwdriver, remove the

Te fl on

seal and O-ring from the shift rail

bore inside the cylinder housing.

182

Figure 180 — Range Shift Cylinder Cutaway View

1. Shift Rail Seal

2. Piston Seal

3. Shift Cylinder Wiper Ring

4. Shift Cylinder Housing

5. Housing-to-Cover O-Ring

6. Cylinder Housing Cover

7. Bolt

8. Piston/Shift Rail Assembly

9. Gasket

Figure 182 — Removing Teflon® Seal and O-Ring

Expander

Page 89

REPAIR INSTRUCTIONS

4. Remove the wiper ring from the piston groove.

183

Figure 183 — Removing Wiper Ring from Piston Groove

5. Using a small screwdriver, remove the

Te fl on

seal and O-ring expander from the

second piston groove.

184

Range Shift Valve

[324]

185

Figure 185 — Range Shift Valve Component Locator

186

(T313L21/T318L21 Shown)

Figure 184 — Removing Teflon® Seal and O-Ring from

Piston Grooves

Page 90

Figure 186 — Cutaway View of Range Shift Valve

Assembly

1. 4 mm Screw

2. Top Cover Seal

3. Top Cover

4. Sintered Bronze Filter

5. Silicone Rubber O-Ring

REPAIR INSTRUCTIONS

1. Remove the four (4 mm) interlock valve top

cover screws.

187

Figure 187 — Valve Top Cover Screws

2. Separate cover from valve housing and remove sintered bronze filter and silicone rubber O-ring.

The sintered bronze filter is the only part that is serviceable on the range shift valve. Replace the range shift valve as an assembly if any internal component has failed or if the valve has become contaminated.

188

Figure 188 — Removing Sintered Bronze Filter

1. Sintered Bronze Filter

2. Cover

3. Valve Housing

3. Inspect top cover gasket and replace as necessary.

Page 91

REPAIR INSTRUCTIONS

Main Drive Pinion Disassembly

[322]

189

Figure 189 — Main Drive Pinion Component Locator

190

(T313L/T318L Shown)

1. Remove the gasket from the main drive pinion bearing cover.

191

Figure 191 — Removing Gasket from Main Drive Pinion

Bearing Cover

2. Remove the spiral snap ring from the end of the main drive pinion shaft, inside the main drive pinion gear. Using a flat-blade screwdriver, roll the snap ring out of the groove and over the shoulder of the main drive pinion.

192

Figure 190 — Exploded View of Main Drive Pinion

1. Main Drive Pinion Shaft

2. Spigot Bearing

3. Snap Ring

4. Main Drive Pinion Gear

5. Spiral Snap Ring

6. Snap Ring

Page 92

7. Bearing

8. Spiral Snap Ring

9. Gasket

10. Pinion Bearing Cover

11. Oil Seal

Figure 192 — Removing Snap Ring from Main Drive

Pinion

The action of removing the snap ring may destroy the snap ring. Make sure a replacement snap ring is available.

3. Remove the main drive pinion gear by lifting it straight up.

REPAIR INSTRUCTIONS

193

Figure 193 — Removing Main Drive Pinion Gear

4. Remove the spigot bearing snap ring from the main drive pinion, using suitable snap ring pliers.

194

6. Remove the main drive pinion cover bearing snap ring, using suitable snap ring pliers.

The large snap ring is very difficult to compress and remove, and may fly off the snap ring pliers, causing injury.

196

Figure 194 — Removing Spigot Bearing Snap Ring

5. Remove the spigot bearing from inside the end of the main drive pinion shaft.

195

Figure 196 — Removing Main Drive Pinion Cover

Bearing Snap Ring

7. Separate the main drive pinion shaft and bearing assembly from the main drive pinion bearing cover.

197

Figure 197 — Removing Main Drive Pinion Shaft and

Bearing from Cover

Figure 195 — Spigot Bearing Removed from Main Drive

Pinion Shaft

Page 93

MACK T313, T318 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual