Ditch Witch JT920 Manual
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Ditch Witch JT920 Manual

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JT920/JT920L - SERVICE

SERIAL NUMBER

SERIAL NUMBER
Record the serial numbers and date of
purchase of your equipment in the
spaces below.
Date of Manufacture:
Date of Purchase:
Drilling Unit Serial Number:

SERVICE

om0115c.eps
1

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Summary of Contents for Ditch Witch JT920

  • Page 1: Service

    JT920/JT920L - SERVICE SERIAL NUMBER SERVICE SERIAL NUMBER Record the serial numbers and date of purchase of your equipment in the spaces below. om0115c.eps Date of Manufacture: Date of Purchase: Drilling Unit Serial Number:...

  • Page 2: Support Procedure

    Return damaged parts to dealer for inspection and warranty consideration if in warranty time frame. Order genuine Ditch Witch replacement or repair parts from your authorized Ditch Witch dealer. Use of another manufacturer's parts may void warranty consideration.

  • Page 3: Foreword

    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:...
  • Page 4 Copyright 1996, 1997, 1998, 2001, 2002, 2004 by The Charles Machine Works, Inc., Perry, Oklahoma , Ditch Witch, CMW, AutoCrowd, Modularmatic, Jet Trac, Roto Witch, Subsite, Fluid Miser, Perma- Soil, Power Pipe, Super Witch, Super Witch II, Pierce Airrow, The Underground, and The Underground Authority Worldwide are registered trademarks of The Charles Machine Works, Inc.

  • Page 5: Table Of Contents

    JT920/JT920L - CONTENTS CONTENTS SERVICE ........1 Serial Number .
  • Page 6 JT920/JT920L - CONTENTS PREPARATION ....... . 55 Gather Information ......55 Inspect Site.
  • Page 7 JT920/JT920L - CONTENTS OPERATION ........87 Start System .
  • Page 8 SPECIFICATIONS ......145 JT920 ........145 JT920L .

  • Page 9: Overview

    JT920/JT920L - OVERVIEW OVERVIEW The JT920 directional drilling unit can be connected to a fluid unit by only one electric line and one fluid hose, or it can have an optional drilling fluid tank mounted directly on the drilling unit.
  • Page 10 Optional equipment includes a Subsite 750 Display that can be mounted beside the control console. The JT920L directional drilling unit can be used with Ditch Witch drilling fluid units and Subsite locating equipment. om0109c.eps 1.

  • Page 11: Controls

    JT920/JT920L - CONTROLS SETUP CONSOLE OVERVIEW CONTROLS SETUP CONSOLE OVERVIEW om2094a.eps 1. Throttle switch 2. Track width control (JT920 only) 3. Stabilizer lift control 4. Frame tilt control 5. Left track control 6. Right track control 7. Autobore select switch 8.
  • Page 12 JT920/JT920L - CONTROLS SETUP CONSOLE OVERVIEW SETUP CONSOLE DESCRIPTIONS Throttle Switch This switch controls engine speed during drilling and backreaming. • Press top to increase speed. • Press bottom to decrease speed. • Return switch to center position ic0136h.eps to maintain selected speed.
  • Page 13 JT920/JT920L - CONTROLS SETUP CONSOLE OVERVIEW Frame Tilt Control This lever raises or lowers drill frame. • Push to lower. • Pull to raise. ic0056c.eps Left Track Control This lever controls speed and direction of left track. • Push to move forward.
  • Page 14 JT920/JT920L - CONTROLS SETUP CONSOLE OVERVIEW Autobore Select Switch This switch selects between autobore and manual modes. • Press top for autobore control. • Press bottom for manual control. Ignition Switch This switch has three positions. • Insert key and turn all the way clockwise to start engine.

  • Page 15: Drill

    JT920/JT920L - CONTROLS DRILL OVERVIEW DRILL OVERVIEW 4 5 6 om0111c.eps 1. Fluid pump switch 2. Spindle control 3. Pipe lift switch (JT920L only) 4. Pipe shuttle switch (JT920L only) 5. Pipe autoload selector (JT920L only) 6. Auxiliary wrench switch 7.
  • Page 16 JT920/JT920L - CONTROLS DRILL OVERVIEW DRILL DESCRIPTIONS Fluid Pump Switch This switch controls fluid pump. • Press left to turn on. • Move to center position to turn off. • Press right for full pump flow to fill pipe with fluid. Switch will ic0059c.eps...
  • Page 17 JT920/JT920L - CONTROLS DRILL OVERVIEW Pipe Lift Switch (JT920L only) This switch raises and lowers all rows in pipe box. • Press top to lower. • Press bottom to raise. Pipe Shuttle Switch (JT920L only) This switch moves shuttle to and from pipe box.
  • Page 18 JT920/JT920L - CONTROLS DRILL OVERVIEW Auxiliary Wrench Switch This switch controls auxiliary (back-up) breakout wrench. • Press top to lock wrench onto pipe flats. • Press bottom to release pipe. ic1327a.eps Fluid Source Selector Switch This switch selects fluid source.
  • Page 19 JT920/JT920L - CONTROLS DRILL OVERVIEW Throttle Switch This switch controls remote fluid unit engine speed. • Press top to run engine at maximum speed. • Press bottom to run engine at idle speed. ic0050c.eps This switch only works when fluid unit throttle switch is in idle position.
  • Page 20 JT920/JT920L - CONTROLS DRILL OVERVIEW Remote Throttle Switch This switch controls engine speed during drilling and backreaming. • Press top to increase speed. • Press bottom to decrease speed. ic0136h.eps This switch only works if throttle switch is in neutral position.
  • Page 21 JT920/JT920L - CONTROLS DRILL OVERVIEW Fluid Flow Control This knob adjusts drilling fluid flow from zero to maximum. • Turn clockwise to increase flow. • Turn counterclockwise to decrease flow. Fluid Pressure Gauge This gauge displays drilling fluid system pressure.

  • Page 22: Gauges And Indicators

    JT920/JT920L - CONTROLS GAUGES AND INDICATORS OVERVIEW GAUGES AND INDICATORS OVERVIEW om2095a.eps 1. Air filter service indicator 2. Fuel gauge 3. Voltmeter 4. Engine temperature gauge 5. Hydraulic oil sight glass 6. Hourmeter 7. Hydraulic oil filter service indicator 8. Hydraulic oil temperature indicator...
  • Page 23 JT920/JT920L - CONTROLS GAUGES AND INDICATORS OVERVIEW GAUGES AND INDICATORS DESCRIPTIONS Air Filter Service Indicator This gauge shows level of vacuum in air filter. Change air filter when yellow band reaches red line. Reset after replacing filter. ic1309a.eps Fuel Gauge This gauge indicates fuel level in tank.
  • Page 24 JT920/JT920L - CONTROLS GAUGES AND INDICATORS OVERVIEW Engine Temperature Gauge This gauge displays engine coolant temperature. Hydraulic Oil Sight Glass This indicator shows level of hydraulic oil in reservoir. Fluid should be slightly visible in glass when oil is cool.
  • Page 25 JT920/JT920L - CONTROLS GAUGES AND INDICATORS OVERVIEW Hydraulic Oil Filter Service Indicator This indicator lights if hydraulic oil pressure is too high. ic0111h.eps Hydraulic Oil Temperature Indicator This indicator lights if hydraulic oil overheats. Engine Oil Pressure Indicator This light glows, horn sounds, and engine shuts down if oil pressure is too low.

  • Page 26: Anchoring System Console

    JT920/JT920L - CONTROLS ANCHORING SYSTEM CONSOLE OVERVIEW ANCHORING SYSTEM CONSOLE OVERVIEW 1 2 3 4 om0127c.eps 1. Left rotation control 2. Left thrust control 3. Right rotation control 4. Right thrust control 5. Anchor slide locks...
  • Page 27 JT920/JT920L - CONTROLS ANCHORING SYSTEM CONSOLE OVERVIEW ANCHORING SYSTEM CONSOLE DESCRIPTIONS Left Rotation Control This lever controls rotation of left anchor. • Push to drive anchor. • Pull to remove anchor. Left Thrust Control This lever controls thrust of left anchor.
  • Page 28 JT920/JT920L - CONTROLS ANCHORING SYSTEM CONSOLE OVERVIEW Right Thrust Control This lever controls thrust of right anchor. • Push to move down. • Pull to move up. Anchor Slide Locks These knobs lock and unlock anchor driver into hole in center of anchor frame.

  • Page 29: Esid

    JT920/JT920L - CONTROLS ESID OVERVIEW ESID OVERVIEW 1. Alphanumeric display 2. Strike indicator 3. Alarm interrupt button 4. Voltage problem indicator 5. Current problem indicator 6. OK indicator 7. Electrical power supply indicator 8. Self test button...
  • Page 30 "A" shows current reading. This area also displays error codes (see "Troubleshoot Strike System" in MAINTENANCE) and strike history information (contact your Ditch Witch dealer for more information). Strike Indicator Red lights come on as values in display increase. Light in triangle represents strike warning condition and will trigger alarm(s) and strobe(s).
  • Page 31 JT920/JT920L - CONTROLS ESID DESCRIPTIONS Current Problem Indicator Red light indicates a current problem. See "Troubleshoot Strike System" in MAINTENANCE. OK Indicator Green light means system self test detected no problems. Strike system is ready to operate if electrical power supply indicator is also on.

  • Page 32: Subsite 950 Display

    JT920/JT920L - CONTROLS SUBSITE 750 DISPLAY OVERVIEW SUBSITE 750 DISPLAY OVERVIEW 1. Left/right indicator and percentage display 2. Pitch/slope indicator and percentage display 3. Roll display 4. Target identifier 5. Depth estimate (pipe number--TMS option) display 6. 750 Display battery status indicator 7.
  • Page 33 JT920/JT920L - CONTROLS SUBSITE 750 DISPLAY DESCRIPTIONS SUBSITE 750 DISPLAY DESCRIPTIONS Left/Right Indicator and Percentage Display This arrow and number show compass beacon’s left or right deviation from initialized reading in percentage or in degrees. Pitch/Slope Indicator and Display This arrow and number show pitch beacon’s percent of grade.
  • Page 34 JT920/JT920L - CONTROLS SUBSITE 750 DISPLAY DESCRIPTIONS Depth Estimate (Pipe Number--TMS Option) Display This display shows beacon depth estimate. It also shows pipe number if using Trac Management System option. 750 Display Battery Status Indicator This indicator shows whether display is getting proper power from drilling unit.
  • Page 35 JT920/JT920L - CONTROLS SUBSITE 750 DISPLAY DESCRIPTIONS Delete Button This button deletes last stored data when using Trac Management System option. • Press to issue command over serial interface. • Previous pipe number will appear in numeric display when data is deleted.
  • Page 36 JT920/JT920L - CONTROLS SUBSITE 750 DISPLAY DESCRIPTIONS Channel Select Button This button selects between two radio channels. • Press and release to display current channel. • Press and hold to switch channels. • Unit defaults to channel one each time unit is turned on.
  • Page 37 JT920/JT920L - CONTROLS SUBSITE 750 DISPLAY DESCRIPTIONS Recall Button This button allows operator to view last stored data when using Trac Management System option. • Press to issue command over serial interface. • Data about previous pipe number (except depth estimate) si1066a.eps...
  • Page 38 JT920/JT920L - CONTROLS SUBSITE 750 DISPLAY DESCRIPTIONS...

  • Page 39: Safety

    Use equipment carefully. Stop operation and investigate anything that does not look or feel right. • Do not operate unit where flammable gas is present. • Contact your Ditch Witch dealer if you have any question about operation, maintenance, or equipment use.

  • Page 40: Accessories

    It should meet legal and regulatory requirements. Lighting Kit If you need additional light, plug lighting kit into provided outlet. Contact your Ditch Witch dealer for further information. UNDERGROUND HAZARDS Striking underground hazards can cause explosion, electrocution, fire, and exposure to hazardous materials.

  • Page 41: Emergency Procedures

    JT920/JT920L - SAFETY EMERGENCY PROCEDURES EMERGENCY PROCEDURES Before operating any equipment, review emergency procedures and check that all safety precautions have been taken. EMERGENCY SHUTDOWN - Turn ignition switch to stop position or push remote engine stop button. Electric Strike Description When working near electric cables, remember the following: •...
  • Page 42 JT920/JT920L - SAFETY EMERGENCY PROCEDURES If an Electric Line is Damaged On Drilling Unit or Bonded Ground Mats 1. DO NOT MOVE. Remain on drilling machine or mats. 2. Warn people nearby that an electric strike has occurred. 3. Have someone contact electric company.
  • Page 43 JT920/JT920L - SAFETY EMERGENCY PROCEDURES 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.

  • Page 44: Jobsite Classification

    JT920/JT920L - SAFETY JOBSITE CLASSIFICATION JOBSITE CLASSIFICATION Inspecting Jobsite • Follow U.S. Department of Labor regulations on excavating and trenching (Part 1926, Subpart P) and other similar regulations. • Contact One-Call (888-258-0808) and any utility companies which do not subscribe to One-Call.
  • Page 45 JT920/JT920L - SAFETY JOBSITE CLASSIFICATION Selecting a Classification Jobsites are classified according to underground hazards present. If working . . . then classify jobsite as . . . within 10’ (3 m) of a buried electric electric line within 10’ (3 m) of a natural...
  • Page 46 JT920/JT920L - SAFETY JOBSITE CLASSIFICATION Applying Precautions Once classified, precautions appropriate for jobsite must be taken. Electric Jobsite Precautions In addition to using a directional drilling system with an electric strike system, use one or both of these methods. •...
  • Page 47 JT920/JT920L - SAFETY JOBSITE CLASSIFICATION Crystalline Silica (Quartz) Dust Precautions Follow OSHA or other guidelines for exposure to crystalline silica when trenching, sawing or drilling through material that might produce dust containing crystalline silica (quartz). Other Jobsite Precautions You may need to use different methods to safely avoid other underground hazards.

  • Page 48: Safety Alert Classifications

    JT920/JT920L - SAFETY 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.

  • Page 49: Safety Alerts

    JT920/JT920L - SAFETY SAFETY ALERTS SAFETY ALERTS 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.
  • Page 50 JT920/JT920L - SAFETY SAFETY ALERTS Jobsite hazards could cause death or serious injury. Use correct equipment and work methods. Use and maintain proper safety equipment. Crushing weight could cause death or serious injury. Use proper procedures and equipment or stay away.
  • Page 51 JT920/JT920L - SAFETY 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. Looking into fiber optic cable could result in permanent vision damage. Do not look into ends of fiber optic or unidentified cable.
  • Page 52 JT920/JT920L - SAFETY SAFETY ALERTS 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.
  • Page 53 JT920/JT920L - SAFETY SAFETY ALERTS 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.
  • Page 54 JT920/JT920L - SAFETY SAFETY ALERTS...

  • Page 55: Preparation

    JT920/JT920L - PREPARATION GATHER INFORMATION PREPARATION GATHER INFORMATION A successful job begins before the bore. The first step in planning is reviewing information already available about the job and jobsite. Job Plan Review blueprints or other plans and make sure you have taken bore enlargement during backreaming and pullback into account.

  • Page 56: Inspect Site

    JT920/JT920L - PREPARATION INSPECT SITE INSPECT SITE Inspect jobsite before transporting equipment. Check for the following: • Overall grade or slope • Changes in elevation such as hills or open trenches • Obstacles such as buildings, railroad crossings, or streams •...
  • Page 57 JT920/JT920L - PREPARATION INSPECT SITE Identify Hazards Identify safety hazards and classify jobsite. See SAFETY. Jobsite hazards could cause death or serious injury. Use correct equipment and work methods. Use and maintain proper safety equipment. NOTICES: • Wear personal protective equipment including hard hat, safety eye wear, and hearing protection.
  • Page 58 JT920/JT920L - PREPARATION INSPECT SITE Select Start and End Points Select one end to use as a starting point. Consider the following when selecting a starting point: Slope Fluid system should be parked on a level site. Consider how slope will affect drilling unit setup, bending pipe, and fluid flow out of hole.

  • Page 59: Plan Bore Path

    JT920/JT920L - PREPARATION PLAN BORE PATH PLAN BORE PATH The bore path, from entry to end, must be planned before drilling begins. Bore path can be marked on ground with spray paint or flags, or written on paper for operator reference.
  • Page 60 This damage adds up and can lead to sudden pipe failure. JT920 drill pipes have a tested bend radius of 85’ (25.9 m), meaning a 90 degree bend, whether during entry and exit or when turning, requires 85’...
  • Page 61 JT920/JT920L - PREPARATION PLAN BORE PATH Entry Pitch Entry pitch is drilling unit slope compared to slope of ground. Entry pitch can be determined two ways: 1. Lay pitch beacon on ground and read pitch. Lay pitch beacon on drilling unit and read pitch. Subtract ground pitch from drill- ing unit pitch.
  • Page 62 JT920/JT920L - PREPARATION PLAN BORE PATH Minimum Setback Setback is the distance from entry to horizontal. If setback is too small, bend limits are exceeded and pipe can be damaged. To determine the minimum setback for your required depth, use chart in APPENDIX, section B.
  • Page 63 JT920/JT920L - PREPARATION PLAN BORE PATH Minimum Depth Because pipe must be bent gradually, entry pitch and bend limits determine how deep the pipe will be when it reaches horizontal. Use the chart in APPENDIX, section B, to determine minimum depth for your job.

  • Page 64: Check Supplies And Prepare Equipment

    JT920/JT920L - PREPARATION CHECK SUPPLIES AND PREPARE EQUIPMENT CHECK SUPPLIES AND PREPARE EQUIPMENT Check Supplies • Receiver/transmitter or tracker with spare batteries • Beacons with new and spare batteries • Two-way radios with new and spare batteries • Quick wrench •...
  • Page 65 JT920/JT920L - PREPARATION CHECK SUPPLIES AND PREPARE EQUIPMENT Prepare Equipment Check levels: • Fuel • Hydraulic fluid • Engine coolant • Battery charge • Engine oil Check condition and function: • Drive chains • Filters (air, oil, hydraulic) • Fluid pump •...

  • Page 66: Prepare Jobsite

    JT920/JT920L - PREPARATION PREPARE JOBSITE PREPARE JOBSITE Jobsite hazards could cause death or serious injury. Use correct equipment and work methods. Use and maintain proper safety equipment. NOTICES: • If jobsite classification is in question or if the possibility of unmarked electric utilities exists, classify jobsite as electric.

  • Page 67: Record Bore Path

    It utilizes the Subsite 750 Tracker, 750 Display, a tracking beacon, and special software. The system can be run in the field using a laptop computer ® equipped with the Windows 95 or higher operating system. See your Ditch Witch dealer for details.
  • Page 68 JT920/JT920L - PREPARATION...

  • Page 69: Transportation

    JT920/JT920L - TRANSPORTATION LIFT TRANSPORTATION LIFT This machine is not configured for lifting. If the machine must be lifted, load machine into a container or onto a platform appropriate for lifting. For weight of machine, see specifications in this manual.

  • Page 70: Tiedown

    JT920/JT920L - TRANSPORTATION TIEDOWN TIEDOWN Points Tiedown points are identified by tiedown decals. Securing to trailer at other points is unsafe and can damage machinery. Procedure Loop tiedowns around unit at tiedown points. Make sure tiedowns are tight before transporting.
  • Page 71 JT920/JT920L - TRANSPORTATION HAUL HAUL Crushing weight. If load falls or moves it could kill or crush you. Use proper procedures and equipment or stay away. NOTICES: • Load and unload trailer on level ground. • Incorrect loading can cause trailer swaying.

  • Page 72: Haul

    JT920/JT920L - TRANSPORTATION HAUL Unloading from Trailer 1. Lower trailer or ramps. 2. Start engine. 3. Remove tiedowns. 4. Raise stabilizers. 5. Use track controls to slowly back unit down trailer or ramps.
  • Page 73 JT920/JT920L - TRANSPORTATION Under normal conditions, drilling unit should not be towed. If unit breaks down and towing is necessary: • Tow for short distances at less than 1 mph (1.6 kph). • Attach chains to indicated tow points facing towing vehicle.

  • Page 74: Tow

    JT920/JT920L - TRANSPORTATION To disengage track hydraulics: 1.Loosen locknut (B). 2.Turn screw (A) on each counterbalance valve clockwise until it stops. IMPORTANT: Be sure to count number of turns. 3.Repeat on other track. om1803.eps To engage track hydraulics: 1. Turn screw (A) on counterbalance exactly same number of turns counterclockwise.
  • Page 75 JT920/JT920L - TRANSPORTATION...
  • Page 76 JT920/JT920L - TRANSPORTATION...

  • Page 77: Setup

    JT920/JT920L - SETUP UNLOAD SETUP UNLOAD 1. Drive drilling unit off trailer, following directions in TRANSPORTATION. 2. Review bore plan and select drilling unit position and remote fluid unit position. Position Drilling Unit and Frame 1. Start engine and move drilling unit to appropriate distance from start of bore.

  • Page 78: Assemble Electric Strike System

    JT920/JT920L - SETUP ASSEMBLE ELECTRIC STRIKE SYSTEM ASSEMBLE ELECTRIC STRIKE SYSTEM Anytime drilling unit is used in an electric jobsite, electric strike system must be properly set up, tested, and used. In addition to ESID control module, strike system includes bonding cables, barriers and protective boots and gloves.
  • Page 79 JT920/JT920L - SETUP ASSEMBLE ELECTRIC STRIKE SYSTEM Assemble Voltage Detector 1. Drive voltage stake into ground at least 6’ (2 m) away from any part of system. 2. Clip voltage limiter to voltage stake. Test Strike System If system fails any part of this test, see “Troubleshoot Strike System”...

  • Page 80: Anchor

    JT920/JT920L - SETUP ANCHOR ANCHOR Crushing weight. If load falls or moves, it could kill or crush you. Use proper procedures and equipment or stay away. NOTICES: • Drive anchors properly before drilling. • If you are not driving two anchors to full depth, drive optional ground rod into soil away from drilling unit.

  • Page 81: Assemble Drill String

    1. Select nozzles and bit. A variety of nozzles and bits are available to suit your particular job conditions. See APPENDIX, section D, for information about nozzles. Contact your Ditch Witch dealer for more information. 2. Insert nozzle (2) into beacon housing (1).
  • Page 82 JT920/JT920L - SETUP ASSEMBLE DRILL STRING Attach EZ-Connect Option A 1. Apply tool joint compound to threads and hand tighten pin-to- pin adapter (4) to beacon housing (1). 2. Attach quick wrench in join position. • Place jaws (1) on wrench flats on both sides of joint.
  • Page 83 JT920/JT920L - SETUP ASSEMBLE DRILL STRING 3. Tighten joint. 4. Turn screw opposite way two turns to relieve pressure and remove quick wrench components. 5. Hand tighten EZ-Connect pin (5) to pin-to-pin adapter (4). 6. Attach quick wrench in join position.
  • Page 84 JT920/JT920L - SETUP ASSEMBLE DRILL STRING Attach Transition Sub 1. Apply tool joint compound to threads and thread transition sub onto saver sub. 2. Align drill pipe flats of EZ-Connect box with front wrench of drill frame. 3. Start drilling unit engine.
  • Page 85 JT920/JT920L - SETUP ASSEMBLE DRILL STRING Connect Drill Pipe 1. Start drilling unit engine. 2. Align transition sub in front wrench. 3. Load pipe. • Make sure pin is in row 1 on lower rear of pipe loader frame. •...
  • Page 86 JT920/JT920L - SETUP Engage EZ-Connect 1. Apply tool joint compound to threads and align hole in EZ- Connect collar with tapped hole in EZ-Connect box. 2. Slide collar onto octagonal barrel and push toward wrench flats. 3. Thread tool head EZ-Connect pin into EZ-Connect box until shoulders are touching.

  • Page 87: Operation

    START SYSTEM OPERATION START SYSTEM This section covers basic operation. For questions about specific situations, contact your Ditch Witch dealer. Improper control function could cause death or serious injury. If control does not work as described in instructions, stop machine and have it serviced.

  • Page 88: Operate Thrust/Rotation Control

    JT920/JT920L - OPERATION OPERATE THRUST/ROTATION CONTROL OPERATE THRUST/ROTATION CONTROL The thrust/rotation control has eight positions which allow the four basic functions to be combined. The chart below summarizes functions that occur when control is put at a combined position. Operator must be in seat for control to function.
  • Page 89 JT920/JT920L - OPERATION OPERATE THRUST/ROTATION CONTROL 1. Start drilling unit and remote fluid unit, if used. If using onboard drilling fluid tank, remove hose from top of tank. Allow both engines to warm up. IMPORTANT: Ensure that mixture of drilling fluid matches drilling conditions.

  • Page 90: Drill First Pipe

    JT920/JT920L - OPERATION DRILL FIRST PIPE DRILL FIRST PIPE Turning shaft can kill you or crush arm or leg. Stay away. NOTICES: • Keep everyone at least 10’ (3 m) away from turning drill string. • Push rod or pipe slowly. Forcing can bend string. Do not use bent rod or pipe.
  • Page 91 JT920/JT920L - OPERATION DRILL FIRST PIPE Break Joint at Saver Sub 1. When joint flats are aligned with front wrench, release joystick. 2. Engage front wrench. 3. Rotate spindle clockwise slowly until wrench flats engage pipe flats. 4. Reverse rotation and slowly move carriage back as threads unscrew.

  • Page 92: Add Pipe

    JT920/JT920L - OPERATION ADD PIPE ADD PIPE Turning shaft can kill you or crush arm or leg. Stay away. Option A: Use Manual Pipeloader Controls 1. Load pipe. • Make sure correct row is selected on pipe loader. • Use loader shuttle switch to move pipe to spindle.
  • Page 93 JT920/JT920L - OPERATION ADD PIPE 4. Press top of drilling unit throttle switch until engine is at full throttle. 5. Adjust fluid pressure. • Press and hold top of fluid pump switch until pipe fills and fluid pressure begins to rise.
  • Page 94 JT920/JT920L - OPERATION ADD PIPE Option B: Use Autoload Function (JT920L only) 1. Position carriage between pipeloader shuttles. 2. Move pipe autoload selector to drill mode. Pipe lift arms will lower. NOTICE: Do not attempt to use manual pipeloader controls with pipe autoload selector in drill mode.
  • Page 95 JT920/JT920L - OPERATION ADD PIPE 8. Press top of drilling unit throttle switch until engine is at full throttle. 9. Adjust fluid pressure. • Press and hold top of fluid pump switch until pipe fills and fluid pressure begins to rise.

  • Page 96: Remove/Add Pipe Box

    JT920/JT920L - OPERATION REMOVE/ADD PIPE BOX REMOVE/ADD PIPE BOX Crushing weight. If load falls or moves it could kill or crush you. Use proper procedures and equipment or stay away. Use hoist capable of supporting the equipment's size and weight.
  • Page 97 JT920/JT920L - OPERATION REMOVE/ADD PIPE BOX Remove 1. Remove lynch pins and pipe box pins (2, 3). 2. Position lift plate assembly (1) into notches on pipe box arm holes. 3. Attach lifting device to ring on lift plate assembly.

  • Page 98: Correct Direction

    These instructions only cover basic procedures. For information about specific equipment or jobsites, contact your Ditch Witch dealer. To track progress and make corrections, one crew member locates the drill head and sends instructions to the operator.
  • Page 99 JT920/JT920L - OPERATION CORRECT DIRECTION 1. Locate drill head. Take readings available with your beacon and locating equipment such as: • depth • pitch • left/right information • temperature • beacon roll 2. Compare position to bore plan. Determine direction drilling should go.

  • Page 100: Surface Drill Head

    JT920/JT920L - OPERATION SURFACE DRILL HEAD SURFACE DRILL HEAD 1. Guide drill head to target pit or up through surface. Make all bends gradual. See "Bend Limits" in SETUP. 2. Clean area around exit point. 3. Turn fluid flow control to off position and remote throttle switch to idle position as soon as drill head emerges.

  • Page 101: Assemble Backream String

    Backreaming Procedure Soil, devices used, and jobsite conditions determine the procedures used in each backream. While this chapter includes basic backreaming information, contact your Ditch Witch dealer for information and training in your soil type and with your equipment. Turning shaft will kill you or crush arm or leg.
  • Page 102 JT920/JT920L - OPERATION ASSEMBLE BACKREAM STRING 1. Select backreaming devices. 2. Determine fluid rate requirements and install appropriate nozzles to provide sufficient flow. 3. Attach pullback devices. 4. Press top of drilling unit throttle switch until engine is at full throttle.
  • Page 103 Pullback devices are available in a wide variety of sizes and types. Soil type, size and type of pullback material, and drilling fluid affect backreamer choice. To determine which combination will work best at your jobsite, contact your Ditch Witch dealer.
  • Page 104 JT920/JT920L - OPERATION ASSEMBLE BACKREAM STRING Determine Fluid Requirements Backreaming is only successful when enough fluid reaches the bore. The amount of fluid needed depends on size of bore, pullback material, and soil condition. This section describes how to find the minimum amount of fluid needed in perfect conditions.
  • Page 105 JT920/JT920L - OPERATION ASSEMBLE BACKREAM STRING Attach EZ-Connect to Backreamer Option A 1. Apply tool joint compound to threads and hand tighten pin-to- pin adapter to backreamer. 2. Attach quick wrench in join position. NOTICE: Never use machine torque to tighten or loosen any joint.
  • Page 106 JT920/JT920L - OPERATION ASSEMBLE BACKREAM STRING 3. Tighten joint using scribe line technique to achieve proper preload. 4. Turn screw opposite way two turns to relieve pressure and remove quick wrench components. 5. Hand tighten EZ-Connect pin to pin-to-pin adapter.
  • Page 107 JT920/JT920L - OPERATION ASSEMBLE BACKREAM STRING Option B 1. Apply tool joint compound to threads and hand tighten pin to EZ-Connect pin adapter. 2. Attach quick wrench in join position. NOTICE: Never use machine torque to tighten or loosen any joint.
  • Page 108 Pullback devices are available for a wide variety of soil types and pullback material. To determine the best pullback combination for your job, contact your Ditch Witch dealer. 1. Move remote throttle switch to idle position. 2. Press bottom of drilling unit throttle switch until engine is at low throttle.

  • Page 109: Remove Pipe

    JT920/JT920L - OPERATION REMOVE PIPE REMOVE PIPE Option A: Use Manual Pipeloader Controls 1. When pipe joint is between front wrench and pipe wiper, release joystick. 2. Engage front wrench. 3. Rotate spindle clockwise until wrench flats engage into pipe flats.
  • Page 110 JT920/JT920L - OPERATION REMOVE PIPE 8. Rotate pipe counterclockwise to unscrew bottom joint. 9. Disengage breakout wrench to release pipe. 10. Rotate spindle counterclockwise and move carriage back slightly to unscrew pipe from saver sub. 11. Move spindle away from pipe.
  • Page 111 JT920/JT920L - OPERATION REMOVE PIPE Option B: Use Autoload Function (JT920L only) 1. Position carriage between pipeloader shuttles. 2. Move pipe autoload selector to backream mode. Pipe lift arms will raise. NOTICE: Do not attempt to use manual pipeloader controls with pipe autoload selector in backream mode.
  • Page 112 JT920/JT920L - OPERATION REMOVE PIPE 7. Rotate counterclockwise until upper joint breaks. If joint does not break at spindle, use auxiliary wrench. • Engage auxiliary wrench. • Rotate spindle counterclockwise until wrench flats engage into pipe flats. • Turn spindle counterclockwise until joint breaks.
  • Page 113 JT920/JT920L - OPERATION REMOVE PIPE 16. Move carriage to back of drill frame. Pipe will automatically be loaded into selected row in pipe box. Turning shaft will kill you or crush arm or leg. Stay away. IMPORTANT: If shuttles do not retract, pipe may not be positioned correctly.

  • Page 114: Remove Pullback Device

    JT920/JT920L - OPERATION REMOVE PULLBACK DEVICE REMOVE PULLBACK DEVICE The pullback device can be removed when the last pipe is on the frame. It can be removed when a target pit along the bore path has been reached. Remaining pipe is then pulled back and removed.

  • Page 115: Troubleshoot Automation

    JT920/JT920L - OPERATION TROUBLESHOOT AUTOMATION TROUBLESHOOT AUTOMATION Drill Mode The most common reason for pipeloader automation cycle interruption in this mode is incorrectly positioned or dirty photoelectric eyes or reflective tape. When carriage is moved to back of drill frame, shuttles should extend and pipe lift arms should raise.
  • Page 116 JT920/JT920L - OPERATION TROUBLESHOOT AUTOMATION Backream Mode The most common reason for pipeloader automation cycle interruption in this mode is incorrect positioning of pipe. When carriage is moved to back of drill frame, shuttles should retract and pipe lift arms should raise. If shuttles do not retract, pipe may not be positioned correctly.

  • Page 117: Breakdown

    JT920/JT920L - BREAKDOWN REMOVE ANCHORS BREAKDOWN REMOVE ANCHORS Crushing weight. If load falls or moves, it could kill or crush you. Use proper procedures and equipment or stay away. 1. Rotate anchor out of ground while fully extending cylinder. 2. When cylinder is fully extended, disengage anchor slide lock.

  • Page 118: Rinse Equipment

    JT920/JT920L - BREAKDOWN RINSE EQUIPMENT RINSE EQUIPMENT Spray water onto equipment to remove dirt and mud. Some pressure might be needed to remove dried mud from wrench area. DISCONNECT Disconnect and store the following hoses and cables: • electric cable, •...

  • Page 119: Lubrication

    JT920/JT920L - LUBRICATION LUBRICATION Fluid under pressure can pierce skin and cause injury or death. Stay away. NOTICES: • 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.

  • Page 120: Drilling Unit

    JT920/JT920L - LUBRICATION DRILLING UNIT DRILLING UNIT om0122c.eps Reference Hours Description Lubricant Points Lube water swivel 1, 2, 3 Check engine oil 5, 6, 8 Check hydraulic oil 1, 2, 3, 4 Change engine oil (initial) Change hydraulic oil filter (initial)
  • Page 121 JT920/JT920L - LUBRICATION DRILLING UNIT Lubricant chart: Multipurpose grease Diesel engine oil Multipurpose gear oil (SAE 80W90) meeting API service classification GL-5 Tractor Hydraulic Fluid: Phillips 66 HG Fluid, Mobilfluid 423, Chevron Tractor Hydraulic Fluid, Texaco TDH Oil, or equivalent...
  • Page 122 JT920/JT920L - LUBRICATION DRILLING UNIT Engine Oil Check Check oil every 10 hours at dipstick (2). If low, refill with DEO at fill (3). Change Change oil after first 50 hours. After that, change oil every 100 hours. om2104a.eps Open drain (4), change filter (1) and...
  • Page 123 JT920/JT920L - LUBRICATION DRILLING UNIT Hydraulic Oil Check Check oil every 10 hours. Maintain fluid level at halfway point on sight glass (6) when engine is off and fluid is cool. Refill with THF at hydraulic oil fill (5). om2105a.eps...
  • Page 124 JT920/JT920L - LUBRICATION DRILLING UNIT Frame and Carriage Rotation Gearbox Check gearbox every 50 hours. Oil should be level with fill plug (11). Fill with MPL as needed. Drain oil at gearbox oil drain (12) every 1000 hours. om2109a.eps Water Swivel...
  • Page 125 JT920/JT920L - LUBRICATION DRILLING UNIT Thrust Chain Lube thrust chain (10) with DEO or chain lubricant every 50 hours. om2108a.eps Flange Bearings Lube flange bearings (9) with MPG every 250 hours. om2107a.eps Pipe Loader Shuttle Slide Lube shuttle slide as needed with MPG.
  • Page 126 JT920/JT920L - LUBRICATION DRILLING UNIT Pipe Auto Lubricator IMPORTANT: Use only Ditch Witch TJC. It is formulated to work with auto lubricator. Use of other material can plug lubricator system and void warranty. Use standard grade TJC (P/N 259-858) for drilling in temperatures up to 75°F (24°C).

  • Page 127: Drilling Fluid Pump

    JT920/JT920L - LUBRICATION DRILLING FLUID PUMP DRILLING FLUID PUMP Check oil level (15) in crankcase every 50 hours. Refill (15) as needed with SAE 30W engine oil. Drain (14) and refill crankcase every 750 hours. Pump holds 1 qt (.9 L). See pump manufacturer’s handbook for...
  • Page 128 JT920/JT920L - LUBRICATION DRILLING FLUID PUMP...

  • Page 129: Maintenance

    JT920/JT920L - MAINTENANCE OVERVIEW MAINTENANCE NOTICE: Unless otherwise instructed, all service in this section should be performed with the engine(s) off. OVERVIEW Hours Task Page number inspect hoses check battery check alternator belt clean radiator check thrust chain tension check track tension and condition...

  • Page 130: General Components

    JT920/JT920L - MAINTENANCE GENERAL COMPONENTS GENERAL COMPONENTS om2111a.eps Task Hours inspect hoses check battery check alternator belt 1, 2 clean radiator replace saver sub as needed NOTICE: Before disconnecting any hydraulic line, turn engine off and operate all controls to relieve pressure. Lower, block, or support any raised component.
  • Page 131 Keep battery clean and free of corrosion. Apply coat of grease to cable clamps after cleaning. In cold weather, battery loses some starting ability. Closely watch voltmeter for signs of battery discharge. If battery will not hold charge, see your Ditch Witch dealer for replacement battery. Alternator Belt Check tension of alternator belt every 50 hours.
  • Page 132 (4) and shield (5). Remove six screws (6) and saver sub (7). Pipe Loader Check pipe loader shuttle inserts (A) and pipe loader shuttle inserts (B) for wear. Replace as needed. See your Ditch Witch dealer for replacement parts. om0287h.eps...
  • Page 133 JT920/JT920L - MAINTENANCE GENERAL COMPONENTS Radiator Check radiator for dirt, grass, and other foreign matter every 25 hours. Check more often if operating in dusty or grassy conditions. Clean out with compressed air or spray wash every 50 hours. Be careful not to damage fins with high pressure air or water.

  • Page 134: Filters

    JT920/JT920L - MAINTENANCE FILTERS FILTERS om2112.eps Task Hours change fuel filter 1000 check muffler as needed change air filter as needed Air Filter Change air filter when yellow band on air filter service indicator reaches red line. To change: •...
  • Page 135 JT920/JT920L - MAINTENANCE FILTERS Muffler Change muffler as needed. Fuel Filter Replace fuel filter every 1000 hours. If you refuel from cans, replace filter more often. To remove: 1. Remove bolt at bottom of filter. 2. Remove cup and paper element.

  • Page 136: Power Components

    JT920/JT920L - MAINTENANCE POWER COMPONENTS POWER COMPONENTS om2114a.eps Task Hours check thrust chain tension as needed check track tension and condition as needed Track Check track tension as needed. To adjust track tension, pump MPG into fitting (A) until dimension (B) is 15- 15.5”...
  • Page 137 JT920/JT920L - MAINTENANCE POWER COMPONENTS Thrust Chain 6mm / .25 in. om0113c.eps Adjust thrust chain tension as needed. To adjust: 1. Move carriage to front of frame. 2. Loosen jam nut (1). 3. Turn nut (2) clockwise to tighten and counterclockwise to loosen chain.

  • Page 138: Pipeloader Automation

    JT920/JT920L - MAINTENANCE PIPELOADER AUTOMATION PIPELOADER AUTOMATION om00135c.eps Proximity Switches Check six proximity switches daily. • front wrench switch (1) • rear shuttle retracted switch (2) • rear shuttle extended switch (7) • slow zone switch (4) • stop zone switch (5) •...
  • Page 139 JT920/JT920L - MAINTENANCE PIPELOADER AUTOMATION Photoelectric Eyes Clean photoelectric eyes (8) and reflective tape with glass cleaner and clean cotton cloth daily. Use of other cleaners will damage lens. Check photoelectric eyes daily. To check: 1. Start drilling unit engine, angle drill frame down, and move carriage to back of frame.

  • Page 140: Pipe

    Keep inside of pipe clean. Drain fluid from pipe. • Replace damaged pipe. • Only use TJC available from your Ditch Witch dealer to maintain warranty. • Follow directions carefully. Screw pipes together correctly. Do not bend pipe beyond recommended bend limit.

  • Page 141: Troubleshoot Strike System

    JT920/JT920L - MAINTENANCE TROUBLESHOOT STRIKE SYSTEM TROUBLESHOOT STRIKE SYSTEM When strike system detects a problem, an error code will be displayed. Anytime this happens, press self test button to retest. If error code is still displayed and does not appear in this chart, have control module checked or replaced.
  • Page 142 JT920/JT920L - MAINTENANCE TROUBLESHOOT STRIKE SYSTEM Battery power Problem detected during Check for error code and light is on, but test have control module system OK light is checked or replaced Defective control module Have control module checked or replaced...

  • Page 143: Use Electric Strike Simulator

    JT920/JT920L - MAINTENANCE USE ELECTRIC STRIKE SIMULATOR USE ELECTRIC STRIKE SIMULATOR The Electric Strike Simulator (p/n 259-506) can be used to test voltage and current sensors on strike indicator. If readings are less than indicated here, replace 9 volt battery in simulator and retest.
  • Page 144 JT920/JT920L - MAINTENANCE USE ELECTRIC STRIKE SIMULATOR Voltage Test 1. Place voltage limiter on something insulated from ground and drilling unit (such as dry board or tire), but near frame of drilling unit. 2. Clip one lead to frame. 3. Clip other lead to one voltage limiter mount.

  • Page 145: Specifications

    JT920/JT920L - SPECIFICATIONS JT920 SPECIFICATIONS JT920 om2097a.eps Dimensions U.S. Metric Length 200 in 5.1 m Height 67.5 in 1.7 m Width 36-50 in 0.9-1.3 m Operating weight (empty water tank, fluid 7325 lb 3322 kg system, pipe box and 56 drill pipes) Drill pipe U.S.
  • Page 146 JT920/JT920L - SPECIFICATIONS JT920 Operational U.S. Metric Spindle Speed 0-182 rpm 0-182 r/min Torque 1100 ft•lb 1491 N•m Thrust 7800 lb 35 kN Pullback 8600 lb 38 kN Bore diameter 2.5-4 in 63-102 mm Backream diameter (soil dependent) 12 in...
  • Page 147 JT920/JT920L - SPECIFICATIONS JT920 Hydraulic system U.S. Metric Flow rate 36 gpm 121 L/min Relief setting 2750 psi 190 bar Fluid capacities U.S. Metric Fuel tank 11.5 gal 43.5 L Hydraulic reservoir 16.5 gal 62.5 L Engine oil with filter 6 qt 5.7 L...

  • Page 148: Jt920L

    JT920/JT920L - SPECIFICATIONS JT920L JT920L om0110c.eps Dimensions U.S. Metric Length 200 in 5.1 m Height 87 in 2.2 m Width 50 in 1.3 m Operating weight 7560 lb 3430 kg Drill pipe U.S. Metric Length 120 in Joint diameter 2 in 50.8 mm...
  • Page 149 JT920/JT920L - SPECIFICATIONS JT920L Operational U.S. Metric Spindle Speed 0-182 rpm 0-182 r/min Torque 1100 ft•lb 1491 N•m Thrust 7800 lb 35 kN Pullback 8600 lb 38 kN Bore diameter 2.5-4 in 63-102 mm Backream diameter (soil dependent) 12 in...
  • Page 150 JT920/JT920L - SPECIFICATIONS JT920L Hydraulic system U.S. Metric Flow rate 36 gpm 121 L/min Relief setting 2750 psi 190 bar Fluid capacities U.S. Metric Fuel tank 11.5 gal 43.5 L Hydraulic reservoir 16.5 gal 62.5 L Engine oil with filter 6 qt 5.7 L...

  • Page 151: Appendix

    A. BEND LIMITS JT920 Power Pipe Drill Pipe Turns in the bore path should be made gradually. All Ditch Witch pipes have recommended bend limits. JT920 drill pipes have a tested bend radius of 105’ (32 m), meaning a 90 degree bend requires 105’...
  • Page 152 Bending pipe beyond recommended limits will overstress pipe and cause damage that may not be seen. This damage adds up and can lead to sudden pipe failure. Use the following charts to keep bends within safe limits. JT920 Power Pipe Drill Pipe...
  • Page 153 JT920/JT920L - APPENDIX A. BEND LIMITS JT920 Power Pipe Drill Pipe Pipe U.S. Metric Forward Lateral Forward Lateral 6 ft 7 in 0 ft 2 in 2.00 m .06 m 13 ft 1 in 0 ft 10 in 3.99 m .25 m...
  • Page 154 JT920/JT920L - APPENDIX A. BEND LIMITS JT920L Power Pipe Drill Pipe...
  • Page 155 JT920/JT920L - APPENDIX A. BEND LIMITS JT920L Power Pipe Drill Pipe Pipe U.S. Metric Forward Lateral Forward Lateral 9 ft 10 in 0 ft 6 in 3.00 m .15 m 19 ft 7 in 1 ft 11 in 5.96 m .59 m...

  • Page 156: Entry Pitch, Setback, And Depth

    Entry pitch is drilling unit slope compared to level ground. Setback is distance from entry to horizontal. Minimum depth is measured at point bore becomes horizontal. JT920 Power Pipe Drill Pipe 24 ft 9 in (7.54 m) 1 ft 1 in (.34 m) 2 ft 9 in (.84 m)
  • Page 157 JT920/JT920L - APPENDIX B. ENTRY PITCH, SETBACK, AND DEPTH JT920L Power Pipe Drill Pipe 25 ft 0 in (7.26 m) 1 ft 4 in (.40 m) 2 ft 11 in (.88 m) 26 ft 11 in (8.19 m) 1 ft 5 in (.44 m) 3 ft 5 in (1.04 m)

  • Page 158: Drilling Fluid Requirements

    JT920/JT920L - APPENDIX C. DRILLING FLUID REQUIREMENTS C. DRILLING FLUID REQUIREMENTS Backreaming is only successful when enough fluid reaches the bore. The amount of fluid needed depends on sizes of bore, pullback material, and nozzles. The chart on the next page can be used to determine the minimum amount of fluid needed in perfect conditions.
  • Page 159 JT920/JT920L - APPENDIX C. DRILLING FLUID REQUIREMENTS Backreamer/product diameter Gallons per foot Liters per meter .5 in 1.27 cm 1 in 2.54 cm 1.5 in 3.81 cm 1.14 2 in 5.08 cm 2.03 2.5 in 6.35 cm 3.17 3 in 7.62 cm...
  • Page 160 JT920/JT920L - APPENDIX C. DRILLING FLUID REQUIREMENTS Backreamer/product diameter Gallons per foot Liters per meter 18.5 in 46.99 cm 13.96 173.42 19 in 48.26 cm 14.73 182.92 19.5 in 49.53 cm 15.51 192.68 20 in 50.8 cm 16.32 202.68 20.5 in 52.07 cm...

  • Page 161: Nozzle Flow

    JT920/JT920L - APPENDIX D. NOZZLE FLOW D. NOZZLE FLOW Select nozzles that will supply at least the amount of fluid per minute needed for the flow and pressure you will be using. A nozzle that will supply more fluid per minute is recommended.
  • Page 162 JT920/JT920L - APPENDIX D. NOZZLE FLOW Metric Nozzle Flow A - Flow per nozzle, liters/minute B - Nozzle pressure, bar C - Nozzle size om1528.pcx...
  • Page 163 CMW reserves the right to supply remanufactured replacement parts as it deems appropriate. * Equipment owners in countries other than U.S., Canada, Mexico, and Puerto Rico should refer to Ditch Witch International Warranty Policy.
  • Page 164 JT920/JT920L - WARRANTY Product Limited Warranty Products are warranted for 90 days from date of delivery of any new product. Free replacement parts and labor will be provided at any authorized dealership for any product which has a defect in material or workmanship within warranty period.
  • Page 165 COMMERCIAL BUYER. ALL OTHER PROVISIONS OF THIS LIMITED WARRANTY APPLY INCLUDING THE DUTIES IMPOSED. Ditch Witch products have been tested to deliver acceptable performance in most conditions. This does not imply they will deliver acceptable performance in all conditions. Therefore, to assure suitability, products should be operated under anticipated working conditions prior to purchase.
  • Page 166 JT920/JT920L - WARRANTY For information regarding this limited warranty, contact CMW’s Product Support department, P.O. Box 66, Perry, OK 73077-0066, or contact your local Ditch Witch dealer. First version: 1/91; Latest revision: 4/99...
  • Page 169 JT920/JT920L -...

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