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Boart Longyear S250 - User Manual

Boart Longyear S250
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S250 ROCKDRILL
PARTS & SERVICE MANUAL

Questions and Answers

  • J
    Jessica AlexanderJul 25, 2025
    Why is my Boart Longyear Drill losing front-end cushion?
    • J
      Jenna RichardsonJul 25, 2025
      A loss of front-end cushion in your Boart Longyear Drill can occur due to a worn piston or a worn front cylinder washer. Replace the piston and check for outer flange wear. Also, check and replace the front cylinder washer, and then check the cushion.
  • D
    Donald GonzalezAug 6, 2025
    What to do if Boart Longyear Drill has lack of lubrication?
    • M
      Michael WhiteAug 6, 2025
      If your Boart Longyear Drill lacks lubrication, make sure to use proper rockdrill oil. Check the lubricator for proper setting and check the lubricator hose length.
  • E
    Ethan JohnsonAug 12, 2025
    What to do if the Boart Longyear Drill is plugged air screen or air hose?
    • C
      Chelsea JacksonAug 12, 2025
      If the air screen or air hose of your Boart Longyear Drill is plugged, clean it.
  • R
    Rebecca TranAug 18, 2025
    How to fix water leaking around water tube seal in Boart Longyear Drill?
    • J
      Jennifer FrankAug 18, 2025
      To fix water leaking around the water tube seal in your Boart Longyear Drill, change the water tube seal.
  • P
    paulwellsOct 30, 2025
    What to do if the Boart Longyear Drill has slow drill speed?
    • E
      Eric HowardOct 30, 2025
      If your Boart Longyear Drill has a slow drill speed, several factors could be the cause: a blocked air line supply, a stuck piston, a dented cylinder, a rotation jam, a seized blowing fronthead, a frozen muffler or exhaust, a damaged or tight front, rockdrill oil that is too heavy for the ambient temperature, too much oil flowing from the lubricator, the machine heating up, dirt in the machine, broken parts, nicked pawls and pawl springs, a sticking main valve, a short or long shank on the drill steel, a worn or broken piston, a plugged hose or air screen, or low air pressure. Here are some steps to resolve this: * Check for blockages in the air line and piston. * Install a moisture trap in the air line at the parts compressor on the surface if the muffler or exhaust is frozen. * Ho...

Summary

Important Safety Information

HAZARD SIGNAL WORDS AND WARNINGS

Explains the meaning of hazard signal words like DANGER, WARNING, CAUTION, and NOTICE.

DANGER Definition

Indicates an imminently hazardous situation that will result in serious injury if not avoided.

WARNING Definition

Indicates a potentially hazardous situation that could result in serious injury if not avoided.

Chapter 1: Introduction and General Information

1.2 Standard Warranty Policy

Details warranty terms for consumables, capital equipment, and general terms.

Chapter 2: Maintenance Procedures

2.1.2 Recommended Tools and Equipment

Lists specific tools and equipment required for rockdrill repair.

2.2 S250 Tool Kit

Details the comprehensive tool kit required to service S250 rockdrill configurations.

Chapter 3: S250 Jackleg;Sinker Drill Maintenance

3.1 Disassembly Procedures

Step-by-step instructions for disassembling the rockdrill.

3.1.1 Clevis Body

Procedure for disassembling the clevis body.

3.1.2 Control Handle

Procedure for disassembling the control handle assembly.

3.1.3 Water Valve & Water Tube

Procedure for disassembling the water valve and water tube.

3.1.4 Water Valve

Procedure for disassembling the water valve.

3.1.5 Water Inlet

Procedure for disassembling the water inlet components.

3.1.6 Air Inlet

Procedure for disassembling the air inlet components.

3.1.7 Throttle Valve Assembly

Procedure for disassembling the throttle valve assembly.

3.1.8 Steel Retainer

Procedure for disassembling the steel retainer parts.

3.2 Assembly Procedures

Step-by-step instructions for reassembling the rockdrill.

Chapter 4: S250 Stoper Drill Maintenance

4.1 Disassembly Procedures

Instructions for disassembling the stoper drill.

4.2 Assembly Procedures

Instructions for reassembling the stoper drill.

Chapter 5: Critical Part Inspection Criteria

Chapter 6: Testing Procedures

6.2 Start-Up and Lubrication

Procedures for starting up the drill and proper lubrication practices.

Chapter 7: Troubleshooting Guide

Drill will not start

Lists reasons and repair procedures for the drill not starting.

Erratic or sluggish operation

Lists reasons and repair procedures for erratic or sluggish operation.

Drill lacks power but sounds good

Lists reasons and repair procedures when drill lacks power.

Boart Longyear S250 Specifications

General IconGeneral
BrandBoart Longyear
ModelS250
CategoryDrill
LanguageEnglish

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