How it Works
Ditch Witch
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RT Line
User Manual
115 pgs2.82 Mb0
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Ditch Witch RT Line User Manual

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RT12/RT16/RT20/RT24
Operator’s Manual
CMW
®
Issue 1.0
Original Translation
053-2439

Overview

Chapter Contents
Serial Number Location . . . . . . . . . . . . . . . . . . . . . . 2
Intended Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Equipment Modification . . . . . . . . . . . . . . . . . . . . . . 3
Unit Components . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Operator Orientation. . . . . . . . . . . . . . . . . . . . . . . . . 4
About This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . 4
• Bulleted Lists. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
• Numbered Lists. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
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Overview - 2 RT12/RT16/RT20/RT24 Operator’s Manual

Serial Number Location

Serial Number Location
Record serial numbers and date of purchase in spaces provided. Trencher serial number is located as shown.
CMW
Item
date of manufacture date of purchase trencher serial number trailer serial number engine serial number

Intended Use

Intended Use
The RT12, RT16, RT20, and RT24 pedestrian trenchers are designed to install buried cable and pipe to depths of 48” (1220 mm) and widths of 8” (200 mm). These units are intended for operation in ambient temperatures from 20° to 115°F (-7° to 46°C). Use in any other way is considered contrary to the intended use.
RT12, RT16, RT20, and RT24 units should be used with genuine Ditch Witch chain, teeth, and sprockets. They should be operated, serviced, and repaired only by persons familiar with their 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 testing.

Unit Components

1. Control console
2. Engine
3. Digging boom and chain
4. Trail wheel
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Overview - 4 RT12/RT16/RT20/RT24 Operator’s Manual

Operator Orientation

Operator Orientation
1. Front of unit
2. Right side of unit
3. Rear of unit
4. Left side of unit

About This Manual

This manual contains information for the proper use of this machine. See the beige Operation Overview pages for basic operating procedures. 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.
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Foreword

This manual is an important part of your equipment. It provides safety information and operation instructions to help you use and 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.
CMW
Foreword - 6 RT12/RT16/RT20/RT24 Operator’s Manual
RT12/RT16/RT20/RT24
Operator’s Manual
Machine Works, Inc.
Issue number 1.0/OM-12/11
Part number 053-2439
Copyright 2011
by The Charles Machine Works, Inc.
, Ditch Witch, CMW, and Roto Witch are registered trademarks of The Charles
CMW

Contents

Overview
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
part number, revision level, and publication date of this manual, and factory contact information
Safety
machine safety alerts and emergency procedures
Controls
machine controls, gauges, and indicators and how to use them
Prepare
procedures for inspecting and classifying the jobsite, planning the installation path, and preparing the jobsite for work
Drive
procedures for startup, cold start, driving, and shutdown
Transport
procedures for lifting, hauling, and towing
1
5
9
21
31
37
41
Trench
procedures for trenching
Drill
procedures for drilling
Systems and Equipment
chain, teeth, sprockets, and optional equipment
Complete the Job
procedures for backfilling and restoring the jobsite and rinsing and storing equipment
Service
service intervals and instructions for this machine including lubrication, replacement of wear items, and basic maintenance
49
53
61
69
71
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Contents - 8 RT12/RT16/RT20/RT24 Operator’s Manual
Specifications
machine specifications including weights, measurements, power ratings, and fluid capacities
Support
the warranty policy for this machine, and procedures for obtaining warranty consideration and training
Service Record
a record of major service performed on the machine
95
109
113
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Safety

Chapter Contents
Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Safety Alert Classifications . . . . . . . . . . . . . . . . . . 11
Safety Alerts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Emergency Procedures . . . . . . . . . . . . . . . . . . . . . 15
• Electric Strike Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
• If an Electric Line is Damaged . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
• If a Gas Line is Damaged . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
• If a Fiber Optic Cable is Damaged . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
• If Machine Catches on Fire. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
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Safety - 10 RT12/RT16/RT20/RT24 Operator’s Manual

Guidelines

Guidelines
Follow these guidelines before operating any jobsite equipment:
• Complete proper training and read operator’s manual before using equipment.
• Contact your local One-Call (811 in USA) or the One-Call referral number (888-258-0808 in USA and Canada) to have underground utilities located before digging. Also contact any utilities that do not participate in the One-Call service.
• 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.
• Wear personal protective equipment.
• 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.
• Replace missing or damaged safety shields and safety signs.
• Use equipment carefully. Stop operation and investigate anything that does not look or feel right.
• Do not operate unit where flammable gas may be present.
• Contact your Ditch Witch dealer if you have any question about operation, maintenance, or equipment use.
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RT12/RT16/RT20/RT24 Operator’s Manual Safety - 11

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.
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Safety - 12 RT12/RT16/RT20/RT24 Operator’s Manual

Safety Alerts

Safety Alerts
Moving digging teeth will kill you or cut off arm or leg. Stay away.
Turning shaft will kill you or crush arm or leg. Stay away.
Electric shock. Contacting electric lines will cause death or serious injury.
Know location of lines and stay away.
Deadly gases. Lack of oxygen or presence of gas will cause sickness or
death. Provide ventilation.
correct equipment and work methods. Use and maintain proper safety equipment.
proper procedures and equipment or stay away.
Jobsite hazards could cause death or serious injury. Use
Crushing weight could cause death or serious injury. Use
Moving parts could cut off hand or foot. Stay away.
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Safety Alerts
Explosion possible. Serious injury or equipment damage could occur.
Follow directions carefully.
Incorrect procedures could result in death, injury, or property damage.
Learn to use equipment correctly.
Improper control function could cause death or serious injury. If control does
not work as described in instructions, stop machine and have it serviced.
Looking into fiber optic cable could result in permanent vision damage. Do
not look into ends of fiber optic or unidentified cable.
Pressurized fluid or air could pierce skin and cause injury or
death. Stay away.
Fire or explosion possible. Fumes could ignite and cause burns. No
smoking, no flame, no spark.
Moving traffic - hazardous situation. Death or serious injury could result.
Avoid moving vehicles, wear high visibility clothing, post appropriate warning signs.
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Safety - 14 RT12/RT16/RT20/RT24 Operator’s Manual
Safety Alerts
Hot pressurized cooling system fluid could cause serious burns. Allow to
cool before servicing.
Flying objects may cause injury. Wear hard hat and safety glasses.
Hot parts may cause burns. Do not touch until cool.
Exposure to high noise levels may cause hearing loss. Wear hearing
protection.
Fall possible. Slips or trips may result in injury. Keep area clean.
Battery acid may cause burns. Avoid contact.
Improper handling or use of chemicals may result in illness, injury, or equipment damage. Follow instructions on labels and in material safety data sheets (MSDS).
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Emergency Procedures

Emergency Procedures
Jobsite hazards could cause death or serious injury. Use correct equipment and work methods. Use and maintain proper safety equipment.
Before operating any equipment, review emergency procedures and check that all safety precautions have been taken.
EMERGENCY SHUTDOWN - Release all controls and turn ignition switch to STOP.

Electric Strike Description

Electric shock. Contacting electric lines will cause death or serious injury.
Know location of lines and stay away.
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.
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Safety - 16 RT12/RT16/RT20/RT24 Operator’s Manual
Emergency Procedures

If an Electric Line is Damaged

If you suspect an electric line has been damaged and you are near pedestrian unit, DO NOT MOVE and do not touch unit. Take the following actions. The order and degree of action will depend upon the situation.
• Warn people nearby that an electric strike has occurred. Instruct them to leave the area and contact utility.
• Do not allow anyone into area until given permission by utility company.
• Do not allow anyone to touch equipment.

If a Gas Line is Damaged

Fire or explosion possible. Fumes could ignite and cause burns. No
smoking, no flame, no spark.
Explosion possible. Serious injury or equipment damage could occur.
Follow directions carefully.
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.
• 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.
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Emergency Procedures

If a Fiber Optic Cable is Damaged

Do not look into cut ends of fiber optic or unidentified cable. Vision damage can occur.

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) 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.
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Safety - 18 RT12/RT16/RT20/RT24 Operator’s Manual
Emergency Procedures
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Operation Overview

Chapter Contents
Planning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Trenching. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Leaving Jobsite. . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
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Operation Overview - 20 RT12/RT16/RT20/RT24 Operator’s Manual

Planning

Planning
1. Gather information about jobsite. See page 31.
2. Inspect jobsite. See page 33.
3. Classify jobsite. See page 34.
4. Select best chain type and tooth pattern for your application. See page 62.
5. Consider optional equipment, if necessary. See page 64.
6. Check supplies and prepare equipment. See page 36.
7. Load unit onto trailer. See page 43.

Trenching

1. Unload unit from trailer. See page 46.
2. Leave optional backfill blade, if equipped, in stowed position with digging boom low to ground.
3. Start unit. See page 38.
4. Drive to starting point of trench. See page 39.
5. Dig the trench. See page 51.
6. Shut down unit. See page 39.

Leaving Jobsite

1. Restore the jobsite. See page 70.
2. Rinse unit and stow tools. See page 70.
3. Load unit onto trailer. See page 43.
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Controls

Chapter Contents
Control Console . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
RT12 Engine Controls . . . . . . . . . . . . . . . . . . . . . . 26
RT16 Engine Controls . . . . . . . . . . . . . . . . . . . . . . 27
RT20 and RT24 Engine Controls . . . . . . . . . . . . . . 29
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Controls - 22 RT12/RT16/RT20/RT24 Operator’s Manual

Control Console

Control Console
1. Digging chain/Roto Witch® control
2. Selector valve control (Roto Witch® option)
3. Boom lift control
4. Speed/direction controls
5. Parking brake lever
6. Hourmeter/tachometer (RT16 option) 6B. Hourmeter (RT 12 option)
7. Ignition Switch (RT12)
8. Throttle switch (RT12)
CMW
Control Console
Item Description Notes
1. Digging chain control To start digging chain, pull
toward operator, then push down to dig position.
To stop digging chain, release control.
To dislodge a rock or other obstruction, pull up on control to reverse chain.
IMPORTANT: This control changes function when equipped with optional Roto Witch.
In drill mode:
To drill clockwise, push down. To stop drill rotation, release
control. To drill counterclockwise, pull
up.
NOTICE: Trenching movement is always backward (toward you).
NOTICE: To dislodge obstructions, reverse chain.
NOTICE: Do not attempt to travel with digging chain control pulled up (chain in reverse position).
2. Selector valve control Optional selector valve control used on units equipped with Roto Witch to change function of digging
chain control. To select drill mode, pull up. To select dig mode, push
down.
3. Boom lift control To lower boom, push. To raise boom, pull.
NOTICE: Keep digging boom low when operating on a slope or transporting. Drive slowly and cautiously at all times.
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Controls - 24 RT12/RT16/RT20/RT24 Operator’s Manual
Control Console
Item Description Notes
4. Speed/direction
controls
5. Parking brake To engage parking brake,
To drive straight forward, push BOTH controls slowly forward.
To drive straight in reverse, pull BOTH controls slowly rearward.
To turn left, move RIGHT speed/direction control for forward or reverse.
To turn right, move LEFT speed/direction control for forward or reverse.
To go faster in any direction, move controls farther from neutral position.
To stop, release controls.
move lever to the right. To disengage parking brake,
move lever left to notch.
NOTICE: Trenching movement is always backward (toward you).
IMPORTANT:
• Move unit slightly to ensure parking brake pins are engaged.
• It might be necessary to move unit slightly to disengage parking brake.
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Control Console
Item Description Notes
6. Hourmeter/tachometer (RT16 option)
Displays engine operating time and engine speed.
6B. (RT12 option)
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7. Ignition switch (RT12) To start engine, turn key all
the way clockwise. Release key as engine starts.
Use engine operating times to schedule service.
To stop engine, turn key counterclockwise.
8. Throttle control (RT12) To increase engine speed,
press bottom. To decrease engine speed,
press top.
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Start unit with throttle switch in the low position.
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Controls - 26 RT12/RT16/RT20/RT24 Operator’s Manual

RT12 Engine Controls

RT12 Engine Controls
1
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1. Fuel shut-off valve
Item Description Notes
1. Fuel shut-off valve To stop fuel flow from fuel
tank to engine, slide lever away from engine.
To allow fuel flow, slide lever toward engine.
Close valve when transporting unit to or from jobsite, or whenever machine is parked.
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RT16 Engine Controls

RT16 Engine Controls
1. Throttle control
2. Choke control
Item Description Notes
1. Throttle control To increase engine speed,
pull up. To decrease engine speed,
push down.
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3. Ignition switch
4. Fuel shut-off valve
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Controls - 28 RT12/RT16/RT20/RT24 Operator’s Manual
RT16 Engine Controls
Item Description Notes
2. Choke control To close choke valve, pull
choke control.
3. Ignition switch To start engine, turn key all
the way clockwise. Release key as engine starts.
To stop engine, turn key counterclockwise.
4. Fuel shut-off valve To stop fuel flow from fuel
tank to engine, turn valve clockwise.
To allow fuel flow, turn valve counterclockwise.
This valve can be closed to enrich air/fuel mixture and help start cold engine.
Open choke valve after engine runs for a few seconds.
Close valve when transporting unit to or from jobsite, or whenever machine is parked.
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RT20/RT24 Engine Controls

RT20/RT24 Engine Controls
1. Throttle control
2. Choke control
3. Ignition switch
Item Description Notes
1. Throttle control To increase engine speed,
pull up. To decrease engine speed,
push down.
4. Oil pressure indicator
5. Hourmeter
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Controls - 30 RT12/RT16/RT20/RT24 Operator’s Manual
RT20/RT24 Engine Controls
Item Description Notes
2. Choke control To close choke valve, pull
choke control.
3. Ignition switch To start engine, turn key all
the way clockwise. Release key as engine starts.
To stop engine, turn key counterclockwise.
4. Oil alert Indicator Lights when oil level is too
low. Engine will not start.
This valve can be closed to enrich air/fuel mixture and help start cold engine.
Open choke valve after engine runs for a few seconds.
Check oil level. Add oil as needed.
5. Hourmeter Displays number of hours
engine has operated.
CMW

Prepare

Chapter Contents
Gather Information . . . . . . . . . . . . . . . . . . . . . . . . . 32
• Review Job Plan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
• Notify One-Call Services. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
• Arrange for Traffic Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
• Plan for Emergency Services . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Inspect Site . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
• Identify Hazards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Classify Jobsite. . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
• Inspect Jobsite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
• Select a Classification. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
• Apply Precautions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Check Supplies and Prepare Equipment . . . . . . . 36
• Supplies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
• Fluid Levels. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
• Condition and Function. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
• Accessories. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
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Prepare - 32 RT12/RT16/RT20/RT24 Operator’s Manual

Gather Information

Gather Information
A successful job begins before you dig. The first step in planning is reviewing information already available about the job and jobsite.

Review Job Plan

Review blueprints or other plans. Check for information about existing or planned structures, elevations, or proposed work that may be taking place at the same time.

Notify One-Call Services

Contact your local One-Call (811 in USA) or the One-Call referral number (888-258-0808 in USA and Canada) to have underground utilities located before digging. Also contact any utilities that do not participate in the One-Call service.

Arrange for Traffic Control

If working near a road or other traffic area, contact local authorities about safety procedures and regulations.

Plan for Emergency Services

Have the telephone numbers for local emergency and medical facilities on hand. Check that you will have access to a telephone.
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Inspect Site

Inspect Site
Inspect jobsite before transporting equipment. Check for the following:
• changes in elevation such as hills or other open trenches
• obstacles such as buildings, railroad crossings, or streams
• signs of utilities (See “Inspect Jobsite” on page 34.)
• traffic
• access
• soil type and condition

Identify Hazards

Identify safety hazards and classify jobsite. See “Classify Jobsite” on page 34.
Jobsite hazards could cause death or serious injury. Use correct equipment and work methods. Use and maintain proper safety equipment.
NOTICE:
• Wear personal protective equipment including hard hat, safety eye wear, and hearing protection.
• Do not wear jewelry or loose clothing.
• Notify One-Call and companies which do not subscribe to One-Call.
• Comply with all utility notification regulations before digging or drilling.
• Verify location of previously marked underground hazards.
• Mark jobsite clearly and keep spectators away.
Remember, jobsite is classified by hazards in place -- not by line being installed.
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Prepare - 34 RT12/RT16/RT20/RT24 Operator’s Manual

Classify Jobsite

Classify Jobsite

Inspect Jobsite

• Follow U.S. Department of Labor regulations on excavating and trenching (Part 1926, Subpart P) and other similar regulations.
• Contact your local One-Call (811 in USA) or the One-Call referral number (888-258-0808 in USA and Canada) to have underground utilities located before digging. Also contact any utilities that do not participate in the One-Call service.
• Inspect jobsite and perimeter for evidence of underground hazards, such as: – “buried utility” notices
– utility facilities without overhead lines – gas or water meters – junction boxes – drop boxes – light poles – manhole covers – sunken ground
• Have an experienced locating equipment operator sweep area within 20’ (6 m) to each side of trench path. Verify previously marked line and cable locations.
• Mark location of all buried utilities and obstructions.
• Classify jobsite.

Select a Classification

Jobsites are classified according to underground hazards present.
If working... then classify jobsite as...
within 10’ (3 m) of a buried electric line electric within 10’ (3 m) of a natural gas line natural gas in sand or granite which is capable of producing crystalline silica
(quartz) dust within 10’ (3 m) of any other hazard other
NOTICE: If you have any doubt about jobsite classification, or if jobsite might contain unmarked hazards, take steps outlined previously to identify hazards and classify jobsite before working.
crystalline silica (quartz) dust
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Classify Jobsite

Apply Precautions

Once classified, precautions appropriate for jobsite must be taken.
Electric Jobsite Precautions
Use one or both of these methods.
• Expose line by careful hand digging or soft excavation.
• Have service shut down while work is in progress. Have electric company test lines before returning them to service.
Natural Gas Jobsite Precautions
In addition to positioning equipment upwind from gas lines, use one or both of these methods.
• Expose lines by careful hand digging or soft excavation.
• Have gas shut off while work is in progress. Have gas company test lines before returning them to service.
Crystalline Silica (Quartz) Dust Precautions
NOTICE: Cutting, drilling, or working materials such as concrete, sand, or rock containing quartz may
result in exposure to silica dust. Use water spray or other means to control dust. If workers are exposed to dust they must wear appropriate breathing protection. Silica dust may cause lung disease and is known to the State of California to cause cancer.
Other Jobsite Precautions
You may need to use different methods to safely avoid other underground hazards. Talk with those knowledgeable about hazards present at each site to determine which precautions should be taken or if job should be attempted.
CMW
Prepare - 36 RT12/RT16/RT20/RT24 Operator’s Manual

Check Supplies and Prepare Equipment

Check Supplies and Prepare Equipment

Supplies

• fuel
• keys
• personal protective equipment, such as hard hat and safety glasses

Fluid Levels

• fuel
• hydraulic fluid (SAE15W40)
• battery charge
• engine oil

Condition and Function

• digging chain and teeth
• filters (air, oil, hydraulic, and fuel if equipped)
• tires and tracks
• pumps and motors
• hoses and valves
• signs, guards, and shields

Accessories

Fire Extinguisher
If required, mount a fire extinguisher near the power unit but away from possible points of ignition. The fire extinguisher should always be classified for both oil and electric fires. It should meet legal and regulatory requirements.
CMW

Drive

Chapter Contents
Start Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Drive. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Shut Down . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
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Drive - 38 RT12/RT16/RT20/RT24 Operator’s Manual

Start Unit

Start Unit
1. Check that all controls are in neutral.
2. If necessary, use choke control to start cold engine.
Explosion possible.
Using starting fluids will cause ignition in the intake manifold.
3. Move throttle to 1/4 open. RT12: Set throttle switch to low.
4. Turn ignition switch to START position to crank engine.
5. Release key when engine starts.
IMPORTANT: If engine does not start, turn ignition switch to OFF position and check for fuel blockage or electrical system problems.
6. Run engine at half throttle or less for five minutes before operating trencher. During warm-up, check that all controls work properly.
EMERGENCY SHUTDOWN: Release controls and turn ignition switch to OFF position.
CMW

Drive

Drive
NOTICE: Keep digging boom low when operating on a slope or transporting. Drive slowly and
cautiously at all times.
1. Disengage parking brake.
Improper control function could cause death or serious injury. If control does not work as described in instructions, stop machine and have it serviced.
2. Pull boom control to raise digging boom.
3. Move throttle to 3/4 open. RT12: Set throttle switch to high/full.
4. Move speed/direction control in direction of preferred travel. Ground speed increases with control movement.

Shut Down

1. Release speed/direction controls.
2. Push boom control to lower digging boom, if space allows.
3. Run engine at low idle for three minutes to cool.
4. Turn ignition switch to OFF position.
5. Close fuel shut-off valve.
6. Remove key.
NOTICE: Machine should not be parked on a slope unless chocked, blocked, or parking brake engaged.
CMW
Drive - 40 RT12/RT16/RT20/RT24 Operator’s Manual
CMW

Transport

Chapter Contents
Lift . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
• Points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
• Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Haul . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Tow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Transport - 42 RT12/RT16/RT20/RT24 Operator’s Manual

Lift

Lift
Crushing weight. If load falls or moves it could kill or crush you. Use
proper procedures and equipment or stay away.

Points

Lifting points are identified by lifting decals. Lifting at other points is unsafe and can damage machinery.

Procedure

Use a hoist and straps or chains capable of supporting the equipment's size and weight. See “Specifications” on page 95 or measure and weigh equipment before lifting.
Standard Lift Points (Using Spreader Bar)
IMPORTANT: Lower boom (as shown) before lifting to achieve proper balance.

Haul

Haul
IMPORTANT:
• Unit should be hauled by trailer.
• Transport unit with optional backfill blade, if equipped, in “stowed” position and digging boom lowered.

Load

Crushing weight. If load falls or moves it could kill or crush you. Use
proper procedures and equipment or stay away. NOTICE:
• Load unit with engine in low idle and boom as low as possible.
• Load trailer on level ground.
• Incorrect loading can cause trailer swaying.
• Attach trailer to vehicle before loading or unloading.
• If loading onto a tilt-bed trailer, ensure that tilt latch is secured in the correct position.
• Ten to fifteen percent of total vehicle weight (equipment plus trailer) must be on tongue to help
prevent trailer sway.
1. Disengage parking brake.
2. Start engine.
3. Pull boom control to raise digging boom, but keep it as low as possible.
4. Move unit to rear of trailer and align with ramps or center of trailer bed.
IMPORTANT: Boom should be facing ramps on trailer.
5. Slow engine to low throttle.
6. Move speed/direction control slowly and push to desired speed.
7. Drive unit onto trailer, digging boom first, until tiedown position is reached.
NOTICE: If loading onto tilt-bed trailer, be prepared for trailer to tilt. Load trencher as far to the front of the trailer as possible.
8. Push boom control to lower digging boom, if space allows.
9. Engage parking brake and shutdown unit.
10. Turn fuel shut-off to off position.
11. Tie down unit.
Transport - 44 RT12/RT16/RT20/RT24 Operator’s Manual
Haul

Tie Down

Points
Tiedown points are identified by tiedown decals. Securing to truck or trailer at other points is unsafe and can damage machinery.
Procedure
With Tie-Down Kit on S1A or S2A Trailer
Use pins (shown) to secure front and rear of unit to trailer.
Haul
Without Tie-Down Kit
Loop tiedowns around unit at tiedown points. Make sure tiedowns are tight before transporting.
Transport - 46 RT12/RT16/RT20/RT24 Operator’s Manual
Tow

Unload

Crushing weight. If load falls or moves it could kill or crush you. Use
proper procedures and equipment or stay away.
NOTICE:
• Unload unit with engine in low idle and boom as low as possible.
• Unload trailer on level ground.
• Attach trailer to vehicle before loading or unloading.
• If trailer tilts, ensure that tilt latch is secured in the correct position.
1. Lower trailer or ramps.
2. Remove tiedowns.
3. Open fuel shut-off valve.
4. Start engine.
5. Disengage parking brake.
6. Pull boom control to raise digging boom, but keep it as low as possible.
7. Slow engine to low throttle and slowly back unit down trailer or ramps.
NOTICE: If unloading from tilt-bed trailer, be prepared for trailer to tilt.
Tow
Under normal conditions, unit should not be towed. If unit breaks down and towing is necessary:
• tow for short distances at less than 1 mph (1.6 km/h)
• do not tow for more than 100’ (30 m)
• use no more than 1,300 lb (5800 N) of towing force
Tow

Prepare Unit for Towing

1. Ensure parking brake is engaged.
2. Block wheels.
3. Connect to tow point.
4. Turn tow valves (shown) counterclockwise two turns.
5. Unblock wheels.
6. Disengage parking brake.

Return Unit to Normal Operation

1. Engage parking brake.
2. Block wheels.
3. Disconnect from tow point.
4. Turn tow valves clockwise two turns.
5. Unblock wheels.
6. Disengage parking brake.
Transport - 48 RT12/RT16/RT20/RT24 Operator’s Manual
Tow

Trench

Chapter Contents
Trench . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Trench - 50 RT12/RT16/RT20/RT24 Operator’s Manual
Jobsite hazards could cause death or serious injury. Use correct
equipment and work methods. Use and maintain proper safety equipment.
NOTICE: Cutting, drilling or working materials such as concrete, sand, or rock containing quartz may result in exposure to silica dust. Use water spray or other means to control dust. If workers are exposed to dust, they must wear appropriate breathing protection. Silica dust may cause lung disease and is known to the State of California to cause cancer.
Electrical shock. Contacting electrical lines will cause death or serious
injury. Know location of lines and stay away. NOTICE: Cutting high voltage cable can cause electrocution. Expose lines by hand before
digging.
Incorrect procedures could result in death, injury, or property damage.
Learn to use equipment correctly.
NOTICE:
• Comply with all utility notification regulations before digging or drilling.
• Notify companies that do not subscribe to One-Call.
Flying objects thrown by machine may strike people. Wear hard hat and
safety glasses.

Trench

Trench
IMPORTANT:
• Position backfill blade in upright “stowed” position for transporting, keeping digging boom low to the ground. Remove blade for trenching and reinstall for backfilling.
• See “Counterweights” on page 66 for proper counterweights for your unit configuration.
1. Remove backfill blade, if equipped.
2. Drive trencher to starting point. Move in line with planned trench.
3. Move throttle to half open.
4. Push boom control to lower digging boom to just above ground.
Moving digging teeth will cause death or serious injury. Stay away.
NOTICE:
• Keep everyone at least 6’ (2 m) from machine, digging boom, and its range of movement.
• Machine may move when chain starts to dig. Allow 3’ (1 m) between end of chain and obstacle.
• Digging chain on top side of boom can catch on root or rock, forcing handlebar down suddenly. Stand back from console and hold controls loosely.
5. Push digging chain control to dig position. DIGGING CHAIN WILL MOVE.
EMERGENCY STOP: Release controls and turn ignition switch to OFF position.
IMPORTANT: Trenching movement is toward you.
6. Increase engine speed to full throttle.
Trench - 52 RT12/RT16/RT20/RT24 Operator’s Manual
Trench
7. Push boom control to slowly lower digging boom to desired trench depth.
8. Move speed/direction control slowly to desired speed.
IMPORTANT:
• Do not make sharp turns. Lower boom to full depth when turning.
• If an object becomes lodged in chain, move attachment speed/direction control to neutral and raise boom slightly. Reverse chain direction. If object must be removed manually, turn engine off and engage parking brake.
9. When trench is complete, release speed/direction controls.
10. Move throttle to half open.
11. Pull boom control to raise digging boom to top of trench.
12. Release digging chain control.
13. Reinstall backfill blade in work position for backfilling. After backfilling is completed, position blade in upright “stowed” position for transporting, keeping digging boom low to ground.
14. Drive away from trench.
15. See page 39 for shutdown procedure.

Drill

Chapter Contents
Drilling Attachment. . . . . . . . . . . . . . . . . . . . . . . . . 55
Prepare Jobsite and Equipment . . . . . . . . . . . . . . 55
• Approach Trench. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
• Target Trench . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
• Drill Rod and Equipment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Drill. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
• Using Drill String Guide. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Add Rod. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Backream. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Disassemble Joints . . . . . . . . . . . . . . . . . . . . . . . . 60
CMW
Drill - 54 RT12/RT16/RT20/RT24 Operator’s Manual
Turning shaft will kill you or crush arm or leg. Stay away.
NOTICE:
• Keep everybody at least 10’ (3 m) away from drill pipe during operation. Do not straddle trench or drill pipe while drilling.
• If swivel malfunctions, material being installed can rotate.
• To align drill rod when starting a bore, use a guide. Guides are available from your Ditch Witch dealership.
• Keep all persons away from material being installed.
Jobsite hazards could cause death or serious injury. Use correct equipment and work methods. Use and maintain proper safety equipment.
NOTICE: Set up warning barriers and keep people away from equipment and jobsite while drilling.
Incorrect procedures could result in death, injury, or property damage.
Learn to use equipment correctly.
Improper control function could cause death or serious injury. If control
does not work as described in instructions, stop machine and have it serviced.
NOTICE:
• Do not alter controls.
• Do not tape or tie down switch or lever.
• Improper control function can cause serious injury.
• If releasing control does not stop turning shaft, turn off power supply. Stop drilling. Have unit repaired.
CMW

Prepare Jobsite and Equipment

Prepare Jobsite and Equipment

Approach Trench (1)

1. Mark path where you intend to drill.
2. Dig an approach trench (1) along the intended bore path.
IMPORTANT: The approach trench should be at least:
• deep enough for pipe to lay flat and enter soil at correct angle
• 20’ (6 m) long
• 4” (100 mm) wide

Target Trench (2)

1. Select a completion point for the drilling project.
2. Dig a target trench (2) across the anticipated completion point.
IMPORTANT:
• The actual length of the target trench depends on soil conditions and length of pipe sections. Make it deep enough for drill bit to enter slightly above the trench floor.
• See “Counterweights” on page 66 for proper counterweights for your unit configuration.
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Drill - 56 RT12/RT16/RT20/RT24 Operator’s Manual
Prepare Jobsite and Equipment

Drill Rod and Equipment

1. Assemble at least 20’ (6 m), but not more than 30’ (9 m), of drill rod.
NOTICE: More than 10-15’ (3-4.5 m) of drill rod out of the trench increases the tendency of drill rod to bend.
2. Install drill bit to the cutting end of the drill string.
3. Put drill string in approach trench.
4. Move machine to the approach trench and align the drilling attachment with the intended bore path.
5. Turn off engine.
6. Attach drill string to drilling attachment.
CMW

Drill

Drill
IMPORTANT: For location and description of drilling controls see “Control Console” on page 22.
EMERGENCY SHUTDOWN: Release all controls and turn ignition switch to OFF position.
1. Pull selector valve upward to select drill mode.
2. Start engine and begin clockwise (forward) rotation.
3. Slowly advance machine while maintaining clockwise rotation.
NOTICE:
• Drilling too quickly causes bit to drift off course and may bend drill rod. After bore path is established, speed may be slightly increased.
• If drill rod starts to bend, stop forward movement of unit and back the unit slightly until rod straightens. Do not drill with bent rod.
• If drill rod hits an obstruction, rotate drill string counterclockwise to back up slightly.
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Drill - 58 RT12/RT16/RT20/RT24 Operator’s Manual
Drill

Using Drill String Guide

Turning shaft will kill you or crush arm or leg. Stay away.
NOTICE:
• Keep everybody at least 10’ (3 m) away from drill rod during operation. Do not straddle trench or drill rod while drilling.
• To align drill rod when starting a bore, use a guide. Guides are available from your Ditch Witch dealership.
Use drill string guide to align drill string as it enters the soil. When using drill string guide, follow these guidelines:
• Use only approved Ditch Witch drill string guide (p/n 179-737).
• Stand only on the left side of the approach trench.
• Keep drill string guide at least 3’ (1 m) behind bit.
• Use drill string guide to control only the first 5’ (1.5 m) of the bore path.
• After drilling 5’ (1.5 m), stop unit and remove drill string guide.
• Do not use drill string guide during backreaming or any time the drill string is being pulled back.
CMW

Add Rod

Add Rod
IMPORTANT: It is recommended that a helper be used to add drill rod.
1. Use control to stop drilling attachment.
2. Use ground drive controls to back up unit 6” (150 mm) to loosen drill rod in ground.
3. Disconnect drill rod from drilling attachment.
4. Use ground drive controls to move unit away from bore.
5. Add one drill rod to continue bore.
• Have a helper direct unit operator to align drilling attachment with new rod and stop when drilling
attachment and rod are 1” (25 mm) apart.
• Have a helper lightly hold rod and direct unit operator to move unit forward slowly.
• As soon as rod begins to engage drilling attachment, have helper release rod and move hands
and arms clear of drilling attachment.

Backream

After drill bit enters target trench, the bore hole may be enlarged by changing the drill bit to a backreamer and drawing it back through the initial bore.
1. Turn ignition switch to OFF position.
2. Replace drill bit with backreamer.
3. Start engine and begin clockwise rotation.
IMPORTANT: Always rotate clockwise during backreaming. Rotate counterclockwise only to dislodge a dry bore bit or reamer that has seized in the bore hole.
4. Slowly back up machine while maintaining rotation.
5. When backreamer exits the bore hole, stop rotation immediately.
IMPORTANT:
• Do not try to increase hole size too much in one pass. Several passes using successively larger reamers will save wear on machine.
• During backreaming, keep drill string straight. Sharp bends in the drill rod at the motor coupling can cause rod failure.
CMW
Drill - 60 RT12/RT16/RT20/RT24 Operator’s Manual

Disassemble Joints

Disassemble Joints
1. Press tab through hole in female side of joint (1) using special tool or screwdriver.
2. Pull rods apart (2).
CMW

Systems and Equipment

Chapter Contents
Chain, Teeth, and Sprockets . . . . . . . . . . . . . . . . . 62
• Chain and Tooth Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
• Chain Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
• Chain Selection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Optional Equipment . . . . . . . . . . . . . . . . . . . . . . . . 64
• Backfill blade. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
• Drilling attachment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
• Counterweights. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Systems and Equipment - 62 RT12/RT16/RT20/RT24 Operator’s Manual

Chain, Teeth, and Sprockets

Chain, Teeth, and Sprockets

Chain and Tooth Maintenance

• Always replace sprockets at the same time you replace the digging chain. Sprockets and chain are designed to work together. Replacing one without the other will cause premature wear of the new part.
• Keep digging teeth sharp. Using dull, worn teeth will decrease production and increase shock load to other trencher components. It can also cause chain stretch, which leads to premature chain wear and failure.
• Maintain the proper amount of tension on the digging chain. Overtightening will cause chain stretch and loss of machine performance.
• Use the tooth pattern most appropriate for your digging conditions. If you move to a different soil type, contact your Ditch Witch dealer for information about the most effective chain type and tooth pattern.

Chain Types

Chain type Features
4-pitch standard chain 2-pitch more teeth for smoother cutting alternating side bar prevents spoil compaction on chain bolt-on adapters allow easy configuration changes Shark Chain II versatile, virtually maintenance-free combination provides pick and shovel effect
Chain, Teeth, and Sprockets

Chain Selection

These charts are meant as a guideline only. No one chain type works well in all conditions. See your Ditch Witch dealer for soil conditions and chain recommendations for your area. Ask for the latest Chain, Teeth, and Sprockets Parts Catalog.
• 1 = best
• 2 = better
• 3 = good
• 4 = not recommended
Chain Sandy
Soil
4-pitch cup tooth 3 1 2 3 4 1 2-pitch cup tooth 2 3 1 1 3 4 bolt-on adaptor, 2-pitch 4 4 3 2 1 4 bolt-on adaptor/cup tooth
combo Shark Chain II 4 3 2 1 1 4 alternating side bar 4 4 4 4 4 1
Soil Description
sandy soil sugar sand, blow sand, or other soils where sand is the predominant component soft soil sandy loam medium soil loams, loamy clays hard soil packed clays, gumbo, all compacted soils
432124
Soft Soil Medium
Soil
Hard Soil Rocky
Soil
Sticky
Soil
rocky soil chunk rock, glacial till, cobble, rip rap, gravel sticky soil gumbo, sticky clays
Systems and Equipment - 64 RT12/RT16/RT20/RT24 Operator’s Manual

Optional Equipment

Optional Equipment
See your Ditch Witch dealer for more information about the following optional equipment.
NOTICE: Adding or removing optional equipment changes counterweight requirement. See chart on page 67 or page 68 to ensure you have the correct counterweights for your configuration.
Equipment Description
booms provide depth options of 24” (610-mm), 30” (760-mm), or 48” (1220 mm);
each length is available with either an adjustment screw or grease cylinder
for tensioning the digging chain mechanical trench cleaner removes spoils from the trench floor remote air filter option on RT12 or RT16, provides extra filtering capacity for dusty conditions turf tires minimize turf disturbance hourmeter/tachometer displays engine operating times and engine speed backfill blade cover trench using machine
drilling attachment counterbalance weights customize unit balance in various configurations 10-tooth sprocket slows digging chain speed to allow teeth time to penetrate into the ground
wheel tracks improve traction over rough terrain
drill under sidewalks and driveways
and increase performance in rocky or extremely hard soil
Optional Equipment

Backfill Blade

The optional backfill blade slides onto a mounting stub (2). When transporting, it is stowed and latched in the upright position using a single pin (1). Remove blade for trenching and reinstall in work position for
backfilling.
NOTICE: Position backfill blade in upright “stowed” position for transporting, keeping digging boom low to the ground. Remove blade for trenching and reinstall for backfilling.
To use the backfill blade, remove pin (1), slide the blade onto the stub (2) in work position, then secure with pin.
After backfilling is completed, position blade in upright “stowed” position and low to the ground for transporting.

Drilling Attachment

The optional drilling attachment option can be used to drill under obstructions such as sidewalks and driveways. For operational information, see “Drill” on page 53.
Systems and Equipment - 66 RT12/RT16/RT20/RT24 Operator’s Manual
Optional Equipment

Counterweights

Select the appropriate counterweights to balance the trenching unit for optimum performance. Use the appropriate chart to determine correct number of counterweights required for unit configuration. Adding tracks, wheel weights, or urethane-filled tires where they are not required reduces the counterweight requirement.
Ref. Weight Description
1 tower weights primary counterweight to balance front and rear of unit.
IMPORTANT: Units come standard with two tower weights. Up to three additional tower weights may be required, depending on configuration. No configuration takes more than five tower weights.
2 low frame weights
(RT20 and RT24 only)
3 wheel weights provide additional counterweighting and traction during trenching.
provide additional counterweighting and traction during trenching
Optional Equipment
Selecting Counterweights for the RT12 and RT16
IMPORTANT: Units come standard with two tower weights. Up to three additional tower weights may be
required, depending on configuration. No configuration takes more than five tower weights. Do not add more counterweight in rear than is necessary.
Option Chain Type Required Modification
24 in boom Cup tooth: 4 in width none
Cup tooth: 6 in width add 1 tower weight Shark/Alligator/Other: 4-6 in width add 1 tower weight
30 in boom Cup tooth: 4 in width add 1 tower weight
Cup tooth: 6 in width add 1 tower weight Shark/Alligator/Other: 4-6 in width add 2 tower weights
36 in boom Cup tooth: 4 in width
add 3 tower weights
Cup tooth: 6 in width add 3 tower weights and
tracks or urethane-filled tires
Shark/Alligator/Other: 4 in width
add 3 tower weights Wheel weights any remove 1 tower weight Urethane-filled tires any (except as required for 36” boom) remove 1 tower weight Tracks any (except as required for 36” boom) remove 1 tower weight Drilling attachment any add 1 tower weight Backfill blade any add 1 tower weight Trench cleaner any add 1 tower weight
1
Requires tracks or urethane-filled tires IF configured with two or more front options.
2
Requires wheel weights IF configured with all three front options.
1
2
Systems and Equipment - 68 RT12/RT16/RT20/RT24 Operator’s Manual
Optional Equipment
Selecting Counterweights for the RT20 and RT24
IMPORTANT: Units come standard with two tower weights. Up to three additional tower weights may be
required, depending on configuration. No configuration takes more than five tower weights. Do not add more counterweight in rear than is necessary.
Option Chain Type Required Modification
24 in boom Cup tooth: 4 in width none
Cup tooth: 6 in width add 1 tower weight Cup tooth: 8 in width (RT24 only) add 2 tower weights Shark/Alligator/Other: 4-6 in width add 1 tower weight Shark/Alligator/Other: 8 in width (RT24
add 3 tower weights
only)
30 in boom Cup tooth: 4-6 in width add 1 tower weight
Cup tooth: 8 in width (RT24 only) add 2 tower weights Shark/Alligator/Other: 4-6 in width add 2 tower weights Shark/Alligator/Other: 8 in width (RT24
only)
36 in boom Cup tooth: 4 in width
add 3 tower weights and tracks or urethane-filled tires
add 3 tower weights
1
Cup tooth: 6 in width add 3 tower weights and tracks or
urethane-filled tires
Cup tooth: 8 in width (RT24 only) add 3 tower weights and tracks or
urethane-filled tires
2
Shark/Alligator/Other: 4 in width add 3 tower weights and tracks or
urethane-filled tires
2
48 in boom (RT24 only) Cup tooth: 4-6 in width add 3 tower weights and tracks or
urethane-filled tires and wheel weights
Cup tooth: 8 in width add 3 tower weights and tracks or
urethane-filled tires and wheel weights and low frame weights
Shark/Alligator/Other: 4 in width add 3 tower weights and tracks or
urethane-filled tires and
wheel weights and low frame weights Wheel weights any (except as required for 48” boom) remove 1 tower weight Urethane-filled tires any (except as required for 36” boom) remove 1 tower weight Tracks any (except as required for 36” boom) remove 1 tower weight Drilling attachment any add 1 tower weight Backfill blade any add 1 tower weight Trench cleaner any add 1 tower weight
1
Requires tracks or urethane-filled tires IF configured with two or more front options.
2
Requires wheel weights IF configured with all three front options.

Complete the Job

Chapter Contents
Restore Jobsite. . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
Rinse Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . 70
Stow Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
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Complete the Job - 70 RT12/RT16/RT20/RT24 Operator’s Manual

Restore Jobsite

Restore Jobsite
After product is installed, return spoils to the trench with optional backfill blade, shovels, or small earth­moving equipment. See optional backfill blade on page 65.

Rinse Equipment

Spray water onto equipment to remove dirt and mud. Lubricate all zerks.
NOTICE: Do not spray water onto operator’s console. Electrical components could be damaged. Wipe down instead.

Stow Tools

Make sure all bits, pullback devices, and other tools are loaded and properly secured on trailer.
CMW

Service

Chapter Contents
Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
Recommended Lubricants/Service Key . . . . . . . . 73
Oil Temperature Chart . . . . . . . . . . . . . . . . . . . . . . 74
Each Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
10 Hour . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
50 Hour . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
100 Hour . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
250 Hour . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
As Needed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
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Service - 72 RT12/RT16/RT20/RT24 Operator’s Manual

Precautions

Precautions
Incorrect procedures could result in death, injury, or property damage.
Learn to use equipment correctly.
NOTICES:
• Unless otherwise instructed, all service should be performed with engine off.
• Refer to engine manufacturer’s manual for engine maintenance instructions.
• Before servicing equipment, lower unstowed attachments to ground.

Welding Precaution

NOTICE: Welding can damage electronics.
• Disconnect battery at battery disconnect switch before welding to prevent damage to battery.
• Connect welder ground clamp close to welding point and make sure no electronic components are in the ground path.

Cleaning Precaution

NOTICE: When cleaning equipment, do not spray electrical components with water.
CMW

Recommended Lubricants/Service Key

Recommended Lubricants/Service Key
Item Description
DEO Diesel engine oil meeting API service classification CF-4 or E1-96 and SAE viscosity
recommended by engine manufacturer (SAE15W40)
GEO Gasoline engine oil meeting or exceeding API SJ. See oil temperature chart for
recommended viscosity grade for each model.
MPG Multipurpose grease meeting ASTM D217 and NLGI 2
MPL Multipurpose gear oil meeting API service classification GL-5 (SAE 80W90)
Check level of fluid or lubricant
Check condition
Filter
Change, replace, adjust, service or test
Proper lubrication and maintenance protects Ditch Witch equipment from damage and failure. Service intervals listed are for minimum requirements. In extreme conditions, service machine more frequently. Use only recommended lubricants.
For more information on engine lubrication and maintenance, see your engine manual.
NOTICE:
• Use only genuine Ditch Witch parts, filters, approved lubricants, TJC, and approved coolants to maintain warranty.
• Use the “Service Record” on page 113 to record all required service to your machine.
CMW
Service - 74 RT12/RT16/RT20/RT24 Operator’s Manual

Engine Oil Temperature Chart

Engine Oil Temperature Chart

RT12 Honda IGX390

Temperature range anticipated before next oil change

RT16 Briggs & Stratton

Temperature range anticipated before next oil change
CMW
Engine Oil Temperature Chart

RT20 Honda GX630 and RT24 Honda GX690

Temperature range anticipated before next oil change
*Below 40° F (4° C) the use of SAE 30 will result in hard starting. ** Above 80° F (27° C) the use of 10W30 may cause increased oil consumption. Check oil level more
frequently.
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Service - 76 RT12/RT16/RT20/RT24 Operator’s Manual

Each Use

Each Use
Location Task Notes Engine Check engine oil level GEO
Check air filter elements
Trencher Check hydraulic fluid level DEO (15W30 with PowerUp
additive) Check hydraulic fluid cooler Check hydraulic hoses Check rear tire pressures 15 psi (1 bar) bar lug tires
22 psi (1.5 bar) turf tires Check lug nut torque 85 ft•lb (115 N•m) Check parking brake operation

Check Engine Oil Level

RT12 Honda iGX390
Check engine oil at dipstick before each use. If low, add GEO until oil level is at highest line on dipstick.
IMPORTANT: For more information on engine oil, see “Recommended Lubricants/Service Key” on page 73 or see engine manual.
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Each Use
RT16 Briggs & Stratton
Check engine oil at dipstick (1) before each use. If low, add GEO at oil fill (2) until oil level is at FULL mark on dipstick.
IMPORTANT: For more information on engine oil, see “Recommended Lubricants/Service Key” on page 73 or see engine manual.
RT20 Honda GX630 and RT24 Honda GX690
Check engine oil at dipstick (1) before each use. If low, add GEO at oil fill (2) until oil level is at FULL mark on dipstick.
NOTICE: DO NOT overfill. Keep oil level at FULL mark.
IMPORTANT: For more information on engine oil, see “Recommended Lubricants/Service Key” on page 73 or see engine manual.
CMW
Service - 78 RT12/RT16/RT20/RT24 Operator’s Manual
Each Use

Check Air Filter Elements

RT12
Check air filter element before each use. Replace element if it is dirty or damaged.
To check:
1. Remove air cleaner cover nut and air cleaner cover.
2. Remove wing nut, air cleaner elements (paper and foam), and air cleaner elbow packing and separate them.
3. Inspect elements for wear and replace if damaged.
4. Inspect air cleaner elbow packing for deterioration and replace if damaged.
NOTICE: Change the elements. Do not attempt to clean them.
• Compressed air or water may damage the elements.
• Tapping filter elements to loosen dirt may damage the elements.
RT12 Optional Air Filter
Replace optional air filter as needed.
NOTICE: Change the elements,. Do not attempt to clean them.
• Compressed air or water may damage the elements.
• Tapping filter elements to loosen dirt may damage the elements.
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Each Use
RT16
Check air filter element before each use. Replace element if it is dirty or damaged.
To check:
1. Remove wing nuts and air cleaner cover.
2. Remove element and replace if dirty.
NOTICE: Change the elements. Do not attempt to clean them.
• Compressed air or water may damage the elements.
• Tapping filter elements to loosen dirt may damage the elements.
RT20 and RT24
Check air filter element before each use. Replace element if it is dirty or damaged.
To check:
1. Lift latches on plastic cover and remove.
2. Remove wing nut and air cleaner cover.
3. Inspect paper and foam elements. Replace if dirty.
NOTICE: Change the elements. Do not attempt to clean them.
• Compressed air or water may damage the elements.
• Tapping filter elements to loosen dirt may damage the elements.
CMW
Service - 80 RT12/RT16/RT20/RT24 Operator’s Manual
Each Use

Check Hydraulic Fluid Level

With digging boom fully raised, check hydraulic fluid at sight glass (1) before each use. If low, add SAE15W40 with PowerUp additive until fluid level is at mid-level in sight glass. Clean dust from cap
(2) by blowing with low pressure air.
NOTICE:
• Hydraulic reservoir can become pressurized. OPEN SLOWLY.
• Use SAE15W40 with additive for hydraulic fluid in these machines.
• Contact your Ditch Witch dealer for Power Up additive.
Add 16 oz (0.47 L) of Power Up oil additive or equivalent to 8 gal (30.28 L) of SAE15W40 for use as hydraulic fluid. Fill hydraulic reservoir to correct level on sight glass.

Check Hydraulic Fluid Cooler

Check hydraulic fluid cooler before each use. If dirty, clean by blowing with low pressure air. For extensive cleaning, remove cover.
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Each Use

Check Hydraulic Hoses

Fluid or air pressure could pierce skin and cause injury or death. Stay
away.
NOTICE: Escaping pressurized fluid can cause injury or pierce skin and poison.
• Before disconnecting a hydraulic line, turn engine off and operate all controls to relieve pressure. Lower, block, or support any raised component with a hoist. Cover connection with heavy cloth and loosen connector nut slightly to relieve residual pressure. Catch all fluid in a container.
• Before using system, check that all connections are tight and all lines are undamaged.
• Fluid leaks can be hard to detect. Use a piece of cardboard or wood, rather than hands, to search for leaks.
• Wear protective clothing, including gloves and eye protection.
If you are injured, seek immediate medical attention from a doctor familiar with this type of injury.
Check hydraulic hoses for leaks every 10 hours.
CMW
Service - 82 RT12/RT16/RT20/RT24 Operator’s Manual
Each Use

Check Rear Tire Pressures

Check rear tire pressures before each use. Maintain pressure at 15 psi (1.0 bar) for bar lug tires or 22 psi (1.5 bar) for turf tires.

Check Lug Nut Torque

Check wheel lug nut torque before each use. Tighten to 85 ft•lb (115 N•m).

Check Parking Brake Operation

Check parking brake operation before each use. To engage parking brake, move lever to the right. To disengage parking brake, move lever left to
notch.
IMPORTANT:
• Move unit slightly to ensure parking brake pins are engaged.
• It might be necessary to move unit slightly to disengage parking brake.
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10 Hour Service

10 Hour Service
Location Task Notes Engine Change engine oil Initial, GEO Trencher Lube pivot MPG
Lube trail wheel MPG Lube auger bearing MPG Lube wheel tracks, if equipped MPG Check digging chain tension MPG

Change Engine Oil

RT12
Change engine oil after the first 10 hours of operation and every 100 hours thereafter.
1. Drain at plug (1) while oil is still warm.
2. Replace plug.
3. Slowly add GEO at fill (2).
IMPORTANT: Engine oil capacity is 1.16 qts (1.1 L). Do not overfill.
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Service - 84 RT12/RT16/RT20/RT24 Operator’s Manual
10 Hour Service
RT16 Briggs & Stratton
Change engine oil and filter after the first 10 hours of operation and every 50 hours thereafter.
1. Drain at plug (2) while oil is still warm.
2. Replace plug.
3. Change oil filter (3).
4. Slowly add GEO at fill cap (1) until level rises to FULL mark on dipstick. Tighten dipstick.
IMPORTANT: Engine oil capacity with filter change is 57.5 oz (1.7 L). Do not overfill.
RT20 and RT24
Change engine oil after the first 10 hours of operation and every 100 hours thereafter.
1. Drain at plug (1) while oil is still warm.
2. Replace plug.
3. Slowly add GEO at fill (2).
IMPORTANT: Engine oil capacity is 2.10 qts (1.99 L). Do not overfill.

Lube Pivot Headshaft Bearing

Lube pivot headshaft bearing zerk with MPG every 10 hours.
To lube:
1. Pump MPG into zerk (shown) until grease is visible at pivot.
2. Operate boom lift controls to ensure proper function of boom and to distribute grease along bearing plate.
3. Pump additional MPG into zerk until grease is again visible at pivot.
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10 Hour Service

Lube Pivot Bushing

Lube pivot bushing zerk with MPG every 10 hours.

Lube Trail Wheel

Lube trail wheel zerk with MPG every 10 hours.

Lube Auger Bearing

Lube auger bearing zerk with MPG every 10 hours.
CMW
Service - 86 RT12/RT16/RT20/RT24 Operator’s Manual
10 Hour Service

Lube Wheel Tracks

Lube wheel tracks, if equipped, at zerk with MPG every 10 hours.

Check Digging Chain Tension

Check digging chain tension every 10 hours and adjust as needed. With boom horizontal, measure distance A from bottom of boom to chain. When properly tensioned, distance A should be 1.5-2.0”
(38-51 mm).
NOTICE: Do not overtighten chain. Overtightening will cause chain stretch, loss of machine performance, and possible premature chain failure.
Adjustment Screw:
1. Loosen four clamp bolts (2) so that boom slides freely.
2. Loosen jam nut on adjustment screw (1).
3. To tighten digging chain, turn adjustment screw clockwise. To loosen digging chain, turn counterclockwise.
4. When proper tension is reached, tighten jam nut.
5. Torque clamp bolts to 75 ft•lb (102 N•m).
Grease Cylinder:
Fluid pressure could pierce skin and cause injury or death. Stay away.
NOTICE: Service digging boom grease cylinder only while standing on opposite side of boom. Wear gloves and safety glasses and cover fitting with cloth when relieving pressure in cylinder.
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10 Hour Service
To tighten digging chain, pump MPG into cylinder at check valve zerk.
NOTICE: Do not overtighten chain. Overtightening will cause chain stretch, loss of machine performance, and possible premature chain failure.
To loosen digging chain, stand on opposite side of boom and unscrew check valve zerk to release grease.
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Service - 88 RT12/RT16/RT20/RT24 Operator’s Manual

50 Hour Service

50 Hour Service
Location Task Notes Engine Change engine oil and filter RT16 only, GEO

Change Engine Oil and Filter (RT16)

Change engine oil and filter every 50 hours.
1. Drain at plug (2) while oil is still warm.
2. Replace plug.
3. Change oil filter (3).
4. Slowly add GEO at fill cap (1) until level rises to FULL mark on dipstick. Tighten dipstick.
IMPORTANT: Engine oil capacity with filter change is 57.5 oz (1.7 L). Do not overfill.
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100 Hour Service

100 Hour Service
Location Task Notes Engine Change engine oil Honda engines, GEO
Change air filter elements Check spark plug

Change Engine Oil

RT12
Change engine oil after the first 10 hours of operation and every 100 hours thereafter.
1. Drain at plug (1) while oil is still warm.
2. Replace plug.
3. Slowly add GEO at fill (2).
IMPORTANT: Engine oil capacity is 1.16 qts (1.10 L). Do not overfill.
RT20 and RT24
Change engine oil and filter after the first 10 hours of operation and every 100 hours thereafter.
1. Drain at plug (1) while oil is still warm.
2. Replace plug.
3. Change spin-on oil filter, (3).
4. Slowly add GEO at fill (2).
IMPORTANT: Engine oil capacity is 2.10 qts (1.99 L). Do not overfill.
CMW
Service - 90 RT12/RT16/RT20/RT24 Operator’s Manual
100 Hour Service

Change Air Filter Elements

RT12 Standard Air Filter
Change air filter elements every 100 hours.
IMPORTANT: If operating in extremely dusty conditions, change filter more frequently.
To change:
1. Remove wing nut (6) and air cleaner cover (5).
2. Remove wing nut (4) and remove elements (2, 3).
3. Reverse procedure to install new elements. Ensure gasket (1) is seated properly.
RT12 Optional Air Filter
Change optional air filter elements, if equipped, every 100 hours.
NOTICE: Change the elements. Do not attempt to clean them.
• Compressed air or water may damage the elements.
• Tapping filter elements to loosen dirt may damage the elements.
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100 Hour Service
RT16
Change air filter element every 100 hours.
To change:
1. Remove wing nuts and air cleaner cover.
2. Remove element and replace.
3. Reverse procedure to install.
NOTICE: Change the elements. Do not attempt to clean them.
• Compressed air or water may damage the elements.
• Tapping filter elements to loosen dirt may damage the elements.

Check Spark Plug

Check spark plug gap every 100 hours. Correct spark plug gap (A) is 0.030” (0.76 mm).
See engine service manual for specific procedure and recommended replacement spark plugs.
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Service - 92 RT12/RT16/RT20/RT24 Operator’s Manual

500 Hour Service

500 Hour Service
Location Task Notes Trencher Change hydraulic fluid and filter DEO (SAE15W40) with
Power Up additive

Change Hydraulic Fluid and Filter

Change hydraulic oil and filter every 500 hours.
RT24 Drain Fluid
1. Remove fuel filler neck (2) and three bolts (1) to remove fuel tank (3) from frame.
2. Drain hydraulic oil by removing suction hose from strainer (4) at bottom of unit.
3. Remove and clean strainer.
4. Reinstall strainer and hose.
5. Use steps 4-6 below to change filter and fluid.
RT10/12 Change fluid and filter
1. Drain fluid by removing hose from strainer (3) at bottom of unit.
2. Remove and clean strainer.
3. Reinstall strainer and hose.
4. Change filter (2).
5. Add 16 oz (0.47 L) of Power Up oil additive to 8 gal (30.28 L) of SAE15W40.
6. Add SAE15W40 oil at hydraulic reservoir at fill cap (1) and fill to correct level on sight
glass.
IMPORTANT: Contact your Ditch Witch dealer for Power Up additive.
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As Needed

As Needed
Location Task Notes Engine Check battery

Replace in-line fuel filter

Trencher Adjust wheel track tension (if equipped)

Check Battery

Keep battery case and terminals clean. Remove all corrosion from terminals with a wire brush, or use a weak solution of baking soda and water to clean terminals. Check battery charge frequently during cold weather.
Replace In-Line Fuel Filter
See engine service manual for procedure.
CMW
Service - 94 RT12/RT16/RT20/RT24 Operator’s Manual
As Needed

Adjust Wheel Track Tension

Adjust wheel track tension, if equipped, when tracks are replaced.
To adjust:
1. Loosen clamp screws (2) and locknuts.
2. Tighten tension screws (1) to 38 ft•lb (52 N•m).
3. Tighten clamp screws (2) and locknuts to 67 ft•lb (90.8 N•m).
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Specifications

CMW
Specifications - 96 RT12/RT16/RT20/RT24 Operator’s Manual

RT12

RT12
Dimensions U.S. Metric
A Trench depth, maximum 36 in 915 mm B Trench width 4.3 - 6 in 110-150 mm C Boom travel down 60° 60° C1 Boom travel up 60° 60° F Headshaft height, digging chain 8.6 in 220 mm L3 Length 84 in 2.1 m W2 Width 33 in 840 mm H2 Height 47 in 1.2 m W4 Tread 26 in 660 mm A2 Angle of departure 35° 35° L4 Wheelbase 32 in 810 mm E1 Centerline trench to outside edge of machine, left 15 in 381 mm E2 Centerline trench to outside edge of machine, right 18 in 457 mm N Spoil discharge reach 10.6 in 270 mm A3 Angle of approach 85° 85°
Unless otherwise noted, dimensions are based on 18x9.50x8 tires and 24” (610-mm) boom in transport position.
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RT12
General
Ditch Witch model RT12, self-propelled, hydrostatic, pedestrian, skid steered, two wheel drive rigid frame, chain type trencher.
Operational U.S. Metric
Vehicle speeds Equipped with tires:
Maximum transit forward 280 fpm 85.3 m/min Maximum transit reverse 114 fpm 34.7 m/min
Equipped with wheel tracks:
Maximum transit forward 198 fpm 60 m/min Maximum transit reverse 97 fpm 29.5 m/min
Digging chain speed:
10 tooth sprocket 324 fpm 98.7 m/min 12 tooth sprocket 389 fpm 118.5 m/min
Spoils handling (single, open-end auger):
Outer diameter 12 in 305 mm Inner diameter 4 in 102mm Length 9 in 229 mm
Operating weight (with 33,000-lb [14 969-kg] test, two-pitch digging chain and 24” [610-mm] roller boom)
Operating weight (with 35,000-lb [15 876-kg] test, 4.6” [117 mm] Combo Shark digging chain, RotoWitch, backfill blade, tracks and trench cleaner)
Power U.S. Metric
Engine: Honda 11.7hp iGX390, gasoline Cooling medium: air Number of cylinders: one Displacement
1020 lb 463 kg
1461 lb 664 kg
3
23.7 in
389 cm
3
Torque @ 2500 rpm 19.5 ft-lb 26.4 N-m Gross power @ 3600 rpm 11.7 hp 8.7 kW Rated speed 3600 rpm 3600 rpm
CMW
Specifications - 98 RT12/RT16/RT20/RT24 Operator’s Manual
RT12
Power U.S. Metric
Maximum tilt angle* 20° 20°
*Exceeding these operational angles will cause engine damage. This DOES NOT IMPLY machine is stable to maximum angle of safe engine operation.
Battery
200 CCA, 12V, reserve capacity 32 min
Power Train U.S. Metric
Ground drive transmission: hydrostatic, infinitely variable from zero to maximum, speed and direction controlled with dual levers
Digging chain drive: hydraulic direct drive, lever-operated, one speed forward and reverse Trencher drive: hydraulic direct drive Pump drive: direct drive from engine Spoils handling drive: mechanical, attached to and rotates with headshaft Tires:
Drive: 18x9.50x8 bar lug 12 psi 83 kPa Drive: 18x9.50x8 turf NHS 22 psi 152 kPa Trail: 13x5.00x6
Hydraulic System U.S. Metric
Tandem pump capacity @ 3600 rpm:
To digging drive 7.8 gpm 29.5 L/min To ground drive 11.4 gpm 43 L/min Total 19.2 gpm 72.5 L/min
Fluid Capacities U.S. Metric
Hydraulic reservoir 8 gal 30 L Hydraulic system 8.5 gal 32 L Fuel tank 1.7 gal 6.4 L Engine oil 1.6 qt 1.1 L
Noise Levels
Operator ear 90 dBA sound pressure per ISO 6394 Exterior 102 dBA sound power per ISO 6393
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RT12
Vibration Levels
Vibration at the operator’s hand during normal operation is 6.639 m/s
2
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