Atlas Copco Secoroc YT29A

Atlas Copco Secoroc YT29A

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Secoroc Rock Drilling Tools

Secoroc YT29A Pusher Leg Rock Drill

Operator's instructions / Spare parts list

Secoroc YT Series Rock Drill

Table of Contents

Questions and Answers:

M
mfarrellAug 1, 2025
Why is the penetration rate of my Atlas Copco Secoroc YT29A decreased?
- G
  garcianathanielAug 2, 2025
  A decreased penetration rate in your Atlas Copco Drill could be due to several reasons. It might be caused by air leakage in hoses or couplings, in which case you should change the packings and, if needed, replace parts in the throttle valve. Another cause could be a worn shank sleeve, so check it for excessive wear and replace if necessary. Air leakage due to a worn piston or cylinder, or a worn guide sleeve or pilot guide, could also be the reason. In these cases, replace the piston and/or cylinder or change the worn part.
A
Angela FullerAug 12, 2025
What to do if my Atlas Copco Drill has poor rotation?
- K
  Kevin CampbellAug 12, 2025
  If your Atlas Copco Drill has poor rotation, several components could be worn. Check the splines of the rifle nut, rifle bar, and piston for wear, and replace them when needed. Also, inspect the toothing in the ratchet housing and ratchet wheel; replace these if the pawls have difficulty catching. Examine the chuck nut for wear, replacing it if the splines are worn to 1/2 of the spline width. Finally, worn pawls can cause poor rotation, so replace all pawls, pawl springs, and pawl pins.
A
Amy BryantAug 22, 2025
How to fix insufficient feed force in Atlas Copco Secoroc YT29A?
- D
  David RowlandAug 22, 2025
  Insufficient feed force in your Atlas Copco Drill can often be attributed to worn or deformed seals and o-rings within the pusher leg mechanism. Specifically, check the piston rod seal in the pusher leg and change the seal if it is worn or deformed. Similarly, inspect the O-rings on the pusher leg coupling and replace them if they show signs of wear or deformation.

Atlas Copco Secoroc YT29A Specifications

General

Category	Drill
Manufacturer	Atlas Copco
Model	Secoroc YT29A
Weight	29 kg
Shank Size	22 x 108 mm
Operating Pressure	0.5 MPa

Summary

Foreword

Scope of Application

Specification

Safety Instructions

Operation

Using the Rock Drill for the First Time

Instructions for initial use after unpacking and installing the tool to prevent corrosion.

Preparations Before Starting

Steps to check equipment, blow out hose, and fill lubricator before operation.

AirWater Pressure and Hose Dimensions

Details on required air/water pressure and hose specifications for optimal performance.

Fitting and Removing the Tool

Procedures for attaching and detaching the working tool, including pre-fitting checks.

Fitting the Working Tool

Step-by-step guide on how to insert and secure the working tool into the chuck.

Removing the Working Tool

Step-by-step guide on how to disengage and remove the working tool from the chuck.

Attaching the Pusher Leg

Instructions for mounting the pusher leg onto the rock drill using specific components.

Controls

Throttle Lever

Explanation of the throttle lever's functions for regulating compressed air and flushing water.

Feed Control

How to adjust the feed force using the feed control lever.

Trigger

Function of the trigger for stopping feed force and retracting the piston rod.

Oil Regulating Valve

How to adjust oil dosing for proper lubrication and its effects on operation.

Drilling

Starting the Rock Drill

Step-by-step procedure for starting the rock drill and collaring a hole.

Stopping the Rock Drill

Procedure to stop percussion, rotation, and flushing.

Re-positioning the Pusher Leg

Steps to adjust the pusher leg position during operation.

Blow-cleaning the Drill Hole

How to clean the drill hole using compressed air, with safety precautions.

Maintenance

When You Have Finished Drilling

Procedures for retracting the tool and shutting down the drill after use.

Selection of Spare Parts

Guidelines on choosing and using genuine spare parts for reliable performance.

Once a Shift (After 8 Hours of Operation)

Daily checks and maintenance tasks to be performed after each shift.

Measures to Prevent Freezing

Once a Week (After 40 Hours of Operation)

Weekly checks and maintenance tasks for the drilling equipment.

Once a Month (After 200 Hours of Operation)

Monthly maintenance and servicing recommendations for the rock drill.

Scrapping and Waste Disposal

Troubleshooting

Spare Parts List and Exploded Drawing

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