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FOREWORD 
This workshop manual has been prepared to provide information regarding repair procedures on Hino Vehicles. 
Applicable model:W04D-J, W04D-TM, TN engine 
When making any repairs on your vehicle, be careful not to be injured through improper procedures. 
As for maintenance items, refer to the Owner's Manual. 
All information and specifications in this manual are based upon the latest product information available at the time 
of printing. 
Hino Motors reserves the right to make changes at any time without prior notice. 
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Repair Manual Quality Report 
Att.) Service Manager, Your Distributor 
Pub. No. 
Name of Dealer 
Subject 
Problem Description 
Issue Date 
Name of Reporter 
Correction Proposal 
A114682E01 
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CAUTION 
This contents does not include all the necessary items about repair and service. This manual is made for 
the use of persons who have special techniques and certifications. If non-specialized or uncertified 
technicians perform repairs or service only using this manual or without proper equipment or tools, this 
may cause severe injury to you or other persons nearby and also cause damage to your customer's 
vehicle. 
In order to prevent dangerous operation and damage to your customer's vehicle, be sure to follow the 
instructions shown below. 
This contents must be read thoroughly. It is especially important to have a good understanding of all 
the contents written in the PRECAUTION of "INTRODUCTION" section. 
The service method written in this manual is very effective to perform repair and service. When 
performing the operations following the procedures using this manual, be sure to use tools specified 
and recommended. If using non-specified or tools other than recommended tools and service 
methods, be sure to confirm the safety of the technicians and that there is no possibility of causing 
personal injury or damage to the customer's vehicle before starting the operation. 
If part replacement is necessary, the part must be replaced with the same part number or equivalent 
part. Do not replace it with an inferior quality part. 
It is important to note that this manual contains various "Cautions" and "Notices" that must be carefully 
observed in order to reduce the risk of personal injury during service or repair, or reduce the possibility 
that improper service or repair may damage the vehicle or render it unsafe. It is also important to 
understand that these "Cautions" and "Notices" are not exaggerations and are possible hazardous 
consequences that might result from failure to follow these instructions. 
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INTRODUCTION 
PREPARATION 
SERVICE SPECIFICATIONS 
ENGINE CONTROL SYSTEM 
ENGINE MECHANICAL 
FUEL 
EMISSION CONTROL 
INTAKE 
EXHAUST 
COOLING 
LUBRICATION 
STARTING 
CHARGING