Yanmar RT70 User manual

RT70
Yanmar® 4TNV98CT, equipped with tires or tracks
Operator’s
Manual
CMW® 053-3307
Issue 2.0
Original Instruction

RT70 Operator’s Manual Overview - 1
Overview
Chapter Contents
Serial Number Location . . . . . . . . . . . . . . . . . . . . . 2
Intended Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Equipment Modification . . . . . . . . . . . . . . . . . . . . 3
Machine Components . . . . . . . . . . . . . . . . . . . . . . 4
Regulatory Notices . . . . . . . . . . . . . . . . . . . . . . . . . . 5
• United States. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
• Canada . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Operator Orientation . . . . . . . . . . . . . . . . . . . . . . . 6
Operating Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
About This Manual . . . . . . . . . . . . . . . . . . . . . . . . . 7
• Bulleted Lists . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
• Numbered Lists . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
California Proposition 65
Diesel engine exhaust and some of its constituents are known to the State of California to
cause cancer, birth defects, and other reproductive harm. www.P65warnings.ca.gov.

Overview - 2 RT70 Operator’s Manual
Serial Number Location
Serial Number Location
Record serial numbers and date of purchase in spaces provided. Serial number is located as shown.
Item
Date of manufacture
Date of purchase
Machine serial number
Front attachment serial number
Rear attachment serial number
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RT70 Operator’s Manual Overview - 3
Intended Use
Intended Use
The RT70 is a riding trencher designed to install buried service lines of various sizes using a variety of Ditch
Witch® attachments.
This machine is intended for operation only according to the instructions in this manual. Operate machine
in ambient temperatures from 10° to 115°F (-12° to 46°C). Contact your Ditch Witch dealer for provisions
required for operating in extreme temperatures. Use in any other way is considered contrary to the
intended use.
This machine should be used with genuine Ditch Witch chain, teeth, and sprockets. It should be operated,
serviced, and repaired only by professionals familiar with its particular characteristics and acquainted
with the relevant safety procedures.
Equipment Modification
This equipment was designed and built in accordance with applicable standards and regulations.
Modification of equipment could mean that it will no longer meet regulations and may not function
properly or in accordance with the operating instructions. Modification of equipment should only be
made by competent personnel possessing knowledge of applicable standards, regulations, equipment
design functionality/requirements and any required specialized training.
Attachment Max. width/diameter Max. depth
BH70 backhoe 18” (460mm) bucket 89” (2.3m)
CT70 trencher 12” (305mm) 61” (1.54m)
MT12 microtrencher 0.75-1.25” (19-32mm) 6-12.5” (165-318mm)
MT16 microtrencher 0.5-1.5” (12.7-38.1mm) 0-16” (0-406mm)
RC20 reel carrier 84” (2.1m) reel diameter n/a
ST70 trencher 12” (305mm) 63.8” (1.62m)
VP70 plow n/a 36” (915mm)
NOTICE: The protection offered by the Rollover Protective Structure (ROPS) will be impaired if it has
been subjected to any modification, structural damage, or has been involved in an overturn accident.
The ROPS must be replaced after a roll-over.

Overview - 4 RT70 Operator’s Manual
Machine Components
Machine Components
1. Rollover Protective Structure (ROPS)
2. Operator station
3. Center console
4. Engine compartment
5. Backfill blade*
*Optional
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RT70 Operator’s Manual Overview - 5
Regulatory Notices
Regulatory Notices
Your equipment is designed and tested to meet regulatory codes and standards for electromagnetic compatibility. Digital
electronics including wireless devices may be options on your equipment.
United States
Your equipment may contain the following: FCC ID: XPYLISAU200 or FCC ID: XMR201903EG25G
This device complies with Part 15 of the FCC Rules. Operation is subject to the following conditions: (1) this device may not cause
harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired
operation. Changes or modifications not expressly approved by The Charles Machine Works, Inc. could void the user’s authority
to operate the equipment.
This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC
rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This
equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the
instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not
occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be
determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the
following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect equipment into an outlet on a circuit different from that to which the receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help.
Canada
CAN ICES-2/NMB-2
This device complies with Industry Canada license-exempt RSS standard(s). Operation is subject to the following two conditions:
(1) this device may not cause interference, and (2) this device must accept any interference, including interference that may
cause undesired operation of the device.
Your equipment may contain the following IC: 8595A-LISAU200 or IC: 10224A-201903EG25G.
Le présent appareil est conforme aux CNR d'Industrie Canada applicables aux appareils radio exempts de licence. L'exploitation
est autorisée aux deux conditions suivantes: (1) l'appareil ne doit pas produire de brouillage, et (2) l'appareil doit accepter tout
brouillage radioélectrique subi, même si le brouillage est susceptible d'en compromettre le fonctionnement.
Votre équipement peut contenir les éléments suivants IC: 8595A-LISAU200 ou IC: 10224A-201903EG25G

Overview - 6 RT70 Operator’s Manual
Operator Orientation
Operator Orientation
1. Front
2. Right side
3. Rear
4. Left side
Operating Area
Operate only from designated seat(s).
IMPORTANT: Top view of machine is shown.
11
2244
33
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RT70 Operator’s Manual Overview - 7
About This Manual
About This Manual
This manual contains information for the proper use of this machine. Cross references such as “See page
50” will direct you to detailed procedures.
Bulleted Lists
Bulleted lists provide helpful or important information or contain procedures that do not have to be
performed in a specific order.
Numbered Lists
Numbered lists contain illustration callouts or list steps that must be performed in order.

Overview - 8 RT70 Operator’s Manual
About This Manual

RT70 Operator’s Manual Foreword - 9
Foreword
This manual is an important part of your equipment. It provides safety information and operation
instructions to help maintain your Ditch Witch equipment.
Read this manual before using your equipment. Keep it with the equipment at all times for future
reference. If you sell your equipment, be sure to give this manual to the new owner.
If you need a replacement copy, contact your Ditch Witch dealer. If you need assistance in locating a
dealer, visit our website at www.ditchwitch.com or write to the following address:
The Charles Machine Works, Inc.
ATTN: Marketing Department
PO Box 66
Perry, OK 73077-0066
USA
The descriptions and specifications in this manual are subject to change without notice. The Charles
Machine Works, Inc. reserves the right to improve equipment. Some product improvements may have
taken place after this manual was published. For the latest information on Ditch Witch equipment, see
your Ditch Witch dealer.
Thank you for buying and using Ditch Witch equipment.

Foreword - 10 RT70 Operator’s Manual
RT70
Operator’s Manual
equipped with tires or track
Issue number 2.0/OM-07/21
Part number 053-3307
Copyright 2021
by The Charles Machine Works, Inc.
and Ditch Witch are registered trademarks of The Charles Machine Works, Inc. Other trademarks
and trade names are those of their respective owners.
This product and its use may be covered by one or more patents at http://charlesmachine.works/patents.

RT70 Operator’s Manual Contents - 11
Contents
Overview 1
Machine serial number, information about the type of work this machine is designed
to perform, basic machine components, and how to use this manual
Foreword 9
Part number, revision level, and publication date or this manual, and factory contact
information
Safety 13
Machine safety alerts and emergency procedures
Prepare 31
Procedures for preparing jobsite, preparing operator, and preparing equipment
Controls 39
Machine controls, gauges, and indicators and how to use them
Drive 83
Procedures for startup, cold start, driving, and shutdown
Transport 89
Procedures for lifting, hauling, and retrieving
Backhoe 97
Procedures for digging with backhoe
Microtrench 103
Procedures for microtrenching
Plow 113
Procedures for plowing
Reel Carrier 119
Procedures for using reel carrier

Contents - 12 RT70 Operator’s Manual
Trench 123
Procedures for trenching
Systems and Equipment 129
Chain, teeth, sprockets, and optional equipment
Complete the Job 141
Procedures for restoring the jobsite and rinsing and storing equipment
Service 143
Service intervals and instructions for this machine including lubrication, replacement
of wear items, and basic maintenance
Specifications 195
Machine specifications including weights, measurements, power ratings, and fluid
capacities
Support 221
The warranty policy for this machine and procedures for obtaining warranty
consideration and training

RT70 Operator’s Manual Safety - 13
Safety
Chapter Contents
Safety Alert Classification . . . . . . . . . . . . . . . . . . . 14
Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Emergency Procedures . . . . . . . . . . . . . . . . . . . . . 16
• Electric Strike Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
• If an Electric Line is Damaged . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
• If a Gas Line is Damaged . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
• If a Fiber Optic Cable is Damaged . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
• If Machine Catches on Fire . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Machine Safety Alerts . . . . . . . . . . . . . . . . . . . . . 19
For additional precautions, see “Prepare” chapter.

Safety - 14 RT70 Operator’s Manual
Safety Alert Classifications
Safety Alert Classifications
These classifications and the icons defined on the following pages work together to alert you to situations
which could be harmful to you, jobsite bystanders or your equipment. When you see these words and
icons in the book or on the machine, carefully read and follow all instructions. YOUR SAFETY IS AT STAKE.
Watch for the three safety alert levels: DANGER, WARNING and CAUTION. Learn what each level means.
indicates a hazardous situation that, if not avoided, will result in death or serious injury.
This signal word is to be limited to the most extreme situations.
indicates a hazardous situation that, if not avoided, could result in death or serious injury.
indicates a hazardous situation that, if not avoided, could result in minor or moderate
injury.
Watch for two other words: NOTICE and IMPORTANT.
NOTICE indicates information considered important, but not hazard-related (e.g., messages relating to
property damage).
IMPORTANT can help you do a better job or make your job easier in some way.

RT70 Operator’s Manual Safety - 15
Guidelines
Guidelines
Follow these guidelines before operating any jobsite equipment:
• Complete proper training.
• Read and understand operator’s manual before using equipment.
• Wear personal protective equipment including long pants, hard hat, eye protection, hearing
protection, and protective footwear.
• Do not wear jewelry or loose clothing.
• Mark proposed path with white paint and have underground utilities located before working. In the
US or Canada, call 811 (US) or 888-258-0808 (US and Canada). Also contact any local utilities that do
not participate in the One-Call service. In countries that do not have a One-Call service, contact all
local utility companies to have underground utilities located.
• Classify jobsite based on its hazards and use correct tools and machinery, safety equipment, and work
methods for jobsite.
• Mark jobsite clearly and keep spectators away.
• Review jobsite hazards, safety and emergency procedures, and individual responsibilities with all
personnel before work begins. Safety videos are available from your Ditch Witch dealer or at
www.ditchwitch.com/safe. Safety Data Sheets (SDS) are available at www.ditchwitch.com/support.
• Fully inspect equipment before operating. Repair or replace any worn or damaged parts. Replace
missing or damaged safety shields and safety alert signs. Contact your Ditch Witch dealer for
assistance.
• Follow instructions on all safety alert signs on machine.
• Use equipment carefully per the instructions in this manual. Stop operation and investigate anything
that does not look or feel right.
• Do not operate machine where flammable gas may be present.
• Only operate equipment in well ventilated areas.
• Always tie down equipment and properly stow accessories, even if traveling short distances.
Misuse of machine can cause death or serious injury.
Read and understand operator’s manual and all other safety instructions
before use. Know how to use all controls.
Raised component. Crushing can cause death or serious
injury. Stay away. Use correct equipment and procedures.

Safety - 16 RT70 Operator’s Manual
Emergency Procedures
• Contact your Ditch Witch dealer if you have any questions about operation, maintenance, or
equipment use.
• Complete the equipment checklist located at www.ditchwitch.com/safe.
Emergency Procedures
Before operating any equipment, review emergency procedures and check that all safety precautions
have been taken.
Electric Strike Description
When working near electric cables, remember the following:
• Electricity follows all paths to ground, not just path of least resistance.
• Pipes, hoses, and cables will conduct electricity back to all equipment.
• Low voltage current can injure or kill. Many work-related electrocutions result from contact with less
than 440 volts.
Most electric strikes are not noticeable, but indications of a strike include:
• power outage
• smoke
• explosion
• popping noises
• arcing electricity
If any of these occur, assume an electric strike has occurred.
Underground utilities. Contact can cause death or
serious injury. Locate and verify underground utilities before digging or
drilling.
EMERGENCY SHUTDOWN: Shut off machine or press remote engine stop button (if equipped).

RT70 Operator’s Manual Safety - 17
Emergency Procedures
If an Electric Line is Damaged
If you suspect an electric line has been damaged, DO NOT MOVE. Take the following actions. The order
and degree of action will depend on the situation.
• If you are on the machine, REMAIN ON MACHINE. Raise attachments and drive from immediate area.
•If you are off the machine,
• DO NOT TOUCH ANY EQUIPMENT.
• If you must leave the area, take small steps with feet close together to reduce the hazard of being
shocked from one foot to the other.
• Warn people nearby that an electric strike has occurred. Instruct them to leave the area.
• Have someone contact electric company to shut off power.
• If you leave the area, do not return to jobsite or allow anyone into area until given permission by
utility company.
If a Gas Line is Damaged
If you suspect a gas line has been damaged, take the following actions. The order and degree of action will
depend on the situation.
• Immediately shut off engine(s), if this can be done safely and quickly.
• Remove any ignition source(s), if this can be done safely and quickly.
• Warn others that a gas line has been cut and that they should leave the area.
• After warning others to leave the area, leave jobsite as quickly as possible.
• Immediately call your local emergency phone number and utility company.
• If jobsite is along street, stop traffic from driving near jobsite.
• Do not return to jobsite until given permission by emergency personnel and utility company.
If a Fiber Optic Cable is Damaged
Do not look into cut ends of fiber optic or unidentified cable. Vision damage can occur. Contact utility
company.
If Machine Catches on Fire
Perform emergency shutdown procedure and then take the following actions. The order and degree of
action will depend on the situation.
• Immediately move battery disconnect switch (if equipped and accessible) to disconnect position.
• If fire is small and fire extinguisher is available, attempt to extinguish fire.
• If fire cannot be extinguished, leave area as quickly as possible and contact emergency personnel.

Safety - 18 RT70 Operator’s Manual
Emergency Procedures

RT70 Operator’s Manual Safety - 19
RT70 Safety Alerts
RT70 Safety Alerts
1. Tiedown location. See Transport chapter for more information.
2. Pre-heater. Fire or explosion can cause death or
serious injury. Never use starter fluid.
3. Moving machine. Fall can cause death or serious
injury. Only operator is allowed on machine. No riders.
4. Underground utilities. Contact can cause death or
serious injury. Locate and verify underground utilities before
digging or drilling.