Service Home How To Procedures UMC C-Axis Brake Replacement - AD0500

UMC C-Axis Brake Replacement - AD0500

10.3 UMC C-AXIS - BRAKE REPLACEMENT

Last updated: 01/06/2022

UMC C-Axis - Brake Replacement

AD0500

Revision A 06/2025

Introduction

This procedure explains how to replace  the C-Axis Brake Ring on Reboot UMC machines.  

Note:  To identify which iteration of these machine models you are dealing with, refer to UMC-750 Machine Version - Identification.

This document applies to the following service kit:

  • 93-3111  18.39 OD ROTARY BRAKE ASSY KIT (UMC-1250/SS)
  • 93-3108 14.39 OD ROTARY BRAKE ASSY KIT (UMC-500/SS, UMC-750/SS, UMC-1000/SS, UMC-1500 DUO/SS)

  You should not do mechanical or electrical machine repairs or service procedures unless you are qualified and knowledgeable about the processes.

   Only authorized personnel with the proper training and certification should do this repair procedure.

   All information herein is provided as a courtesy for Haas machine owners for reference and illustrative purposes only. Haas Automation cannot be held responsible for repairs you perform. Only those services and repairs that are provided by authorized Haas Factory Outlet distributors are guaranteed.

Important: Damage to brake ring will occur if air supply is not disconnected and purged from machine before beginning procedure.

Removal Process

1

  • Home the B and C-Axis.
  • Press the Emergency Stop button.
  • Open the lube panel on the tool-changer side of the machine.
  • Rotate the ball valve shown to cut off air the the machine.
    • The wings of the valve should be perpendicular to the pipe.

Purge excess air pressure from the machine by pulling and holding the ring on the purge valve until you no longer hear air escaping.

Note: The initial pull of the ring will make a popping sound. This is normal.

2

  • Remove the brake line from the the C-Axis booster

Important: Damage to brake ring will occur if air supply is not disconnected and purged from machine before beginning procedure.

3

  • Install a Male 7/16"-20 O-Ring Boss fitting (dash number -04) into the booster where the brake line was removed.

4

  • Open the lube panel on the tool-changer side of the machine.
  • Rotate the ball valve shown to return air to the the machine.
    • The wings of the valve should be parallel to the pipe.

5

  • Release Emergency Stop
  • Clear alarms
  • Rotate the B-Axis -90°
  • Remove the brake line from the the C-Axis brake by removing the fitting shown. You will have to remove the casting cover plate to do so.

6

  • Home the B and C-Axis.
  • Remove the plastic bolt cover plugs to access the platter mounting bolts.
  • To do so drill a pilot hole then, insert a wood screw or similar to use as a handle to remove each plug. These will need to be replaced at the end of this procedure.
  • Once you have access to the mounting screws, remove them as well.
UMC Rotary Unit – Weight Reference Guide

7

  • The platter can now be safely lifted from the rotary assembly.
  • To do so first install 2 T-nuts and 2 eyebolts in the configuration shown.
  • Next, use a lifting strap and crane/fork-lift to slowly lift the platter straight up and off of the rotary assembly.
  • Be mindful of any shims where the platter mates to the gearbox. Be mindful to keep these shims in the same position you found them. This will save you time during the platter alignment process when reinstalling this platter.

8

  • If removing a No-Slot or Pallet-Pool platter, you will need to use tool 15-6462.
  • Next, use a lifting strap and crane/fork-lift to slowly lift the platter straight up and off of the rotary assembly.
  • Be mindful of any shims where the platter mates to the gearbox. Be mindful to keep these shims in the same position you found them. This will save you time during the alignment process when reinstalling this platter.

9

  • Remove the brake ring assembly by removing the 10 bolts shown.

Installation Process

1

Requirement: Verify machine is equipped with Brake Regulators. Reference the following AD documents: AD0601 - UMC Brake Booster Regulator Service Kit
 
  • Throroughly clean all mating surfaces and inspect new brake ring assembly for damage
  • Loosely Install the new brake ring assembly in the orientation shown using the 10 bolts removed previously.
  • Do not torque.

 

 

2

  • Indicate the outer diameter of the brake assembly within 0.001" TIR by jogging the C-Axis with the indicator tip on the outer diameter of the brake ring assembly as shown.
  • Once indicated, TORQUE MOUNTING BOLTS TO SPEC. and home the C-Axis.
  • Rotate the B-Axis -90° to reinstall the C-Axis hydraulic brake line.
  • Reinstall the casting cover
  • Home the B-Axis
  •  Apply 5% MOLY MOBIL GREASE (99-1792) to the brake friction surface that will be in contact with the platter. 
  • Be sure that the amount of MOLY MOBIL GREASE applied is not excessive and is uniform in application around the entire diameter
  • After applying grease to the brake, thoroughly clean all mating sufaces of the platter and follow the UMC PLATTER REPLACEMENT PROCEDURE to properly install the platter. Failure to follow this procedure will result in platter misalignment.
  • Read through the entire platter replacement procedure before attempting. This will include bleeding the C-Axis brake.