Olympus BH-2 Complete Teardown, Cleaning, And Reassembly
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Olympus BH-2 Complete Teardown, Cleaning, And Reassembly

Coaxial focus mechanism
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Complete Teardown, Cleaning,
and Reassembly of the Olympus
BH-2 Coaxial Focus Mechanism
All rights reserved. This document may not be reproduced or distributed, in whole or in part, for any commercial
purpose without the express written consent of the author (carlh6902@gmail.com). Permission is hereby granted to
distribute this PDF document in its entirety for personal, non-commercial purposes only, provided that the contents are
not modified in any way, including the copyright notices contained herein. This document may be freely distributed on
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informational purposes only, with no expressed or implied warranties whatsoever, including, but not limited to,
function, suitability, safety, accuracy, or completeness of information.
Revision
Description of Changes
1
*** Initial release ***
2
Revised 1.5mm Allen tool and Loctite 222 callouts. Corrected Figure 50 text.
Clarified hardware and tool types, revised method to clear setscrew heads of adhesive, added SHC220 grease option, revised
3
spring pre-loading procedure, and improved text readability of images.
4
Common formatting, added JIS screws text, clarified setscrew removal methods, updated Appendix 1 and coil preset
Complete Teardown, Cleaning, and Reassembly of the Olympus BH-2 Coaxial Focus Mechanism
Revision 4
Copyright © 2017, 2018, 2021 Carl Hunsinger
Revision History
Date
April 13, 2017
May 8, 2017
May 21, 2018
April 28, 2021
Revision 4
Page 1 of 40

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Summary of Contents for Olympus BH-2

  • Page 1 Common formatting, added JIS screws text, clarified setscrew removal methods, updated Appendix 1 and coil preset April 28, 2021 Complete Teardown, Cleaning, and Reassembly of the Olympus BH-2 Coaxial Focus Mechanism Revision 4 Page 1 of 40...

  • Page 2: Table Of Contents

    Reinstall the Pinion Assembly into the Pillar Arm......................24 Reinstall the Coarse-Focus Shaft ............................25 Reassemble the Pre-Focus Stop Mechanism ........................26 Complete Teardown, Cleaning, and Reassembly of the Olympus BH-2 Coaxial Focus Mechanism Revision 4 Page 2 of 40...
  • Page 3 How to Contact the Author ..............................37 Acknowledgements ................................37 Appendix 1 .................................... 38 A Caution Regarding the Plastic Gears in the Olympus BH-2 ................... 38 Shipping Damage to BH-2 Microscope Stands ......................38 Preparing BH-2 Stands for Shipping ..........................38 Appendix 2 ....................................
  • Page 4 Figure 60 – Bearing balls removed from retaining-ring end ....................22 Figure 61 – The bearing balls removed from gear end ......................22 Complete Teardown, Cleaning, and Reassembly of the Olympus BH-2 Coaxial Focus Mechanism Revision 4 Page 4 of 40...
  • Page 5 Figure 109 – Apply grease to the teeth of both gears ......................34 Figure 110 – Stick shims onto flanges with dabs of grease ....................34 Complete Teardown, Cleaning, and Reassembly of the Olympus BH-2 Coaxial Focus Mechanism Revision 4...
  • Page 6 Figure 121 – The fine-focus shaft and plastic gear in knob ....................38 Figure 122 – A fine-focus gear damaged during shipping ....................38 Figure 123 – The brass focus rack ............................38 Complete Teardown, Cleaning, and Reassembly of the Olympus BH-2 Coaxial Focus Mechanism Revision 4 Page 6 of 40...

  • Page 7: Introduction

    “X”, stamped into one identification during reassembly. Complete Teardown, Cleaning, and Reassembly of the Olympus BH-2 Coaxial Focus Mechanism Revision 4 Page 7 of 40...

  • Page 8: Supplies Needed

    SHC 220 grease. introduced with the reversed nosepiece. Complete Teardown, Cleaning, and Reassembly of the Olympus BH-2 Coaxial Focus Mechanism Revision 4 Page 8 of 40...

  • Page 9: Remove The Lamphouse

    (see Figure Complete Teardown, Cleaning, and Reassembly of the Olympus BH-2 Coaxial Focus Mechanism Revision 4 Page 9 of 40...

  • Page 10: Remove The Focus Gearbox

    (either on the gearbox housing or to the to remove the lower M3X8 hex socket-head cap screw pillar arm casting), but you should remove them and Complete Teardown, Cleaning, and Reassembly of the Olympus BH-2 Coaxial Focus Mechanism Revision 4 Page 10 of 40...

  • Page 11: Check The Focus Block For Freedom Of Motion

    Raise and lower the focus block by Figure 13 – Remove the caps from the fine-focus knobs Complete Teardown, Cleaning, and Reassembly of the Olympus BH-2 Coaxial Focus Mechanism Revision 4 Page 11 of 40...

  • Page 12: Remove The First Fine-Focus Knob

    Note that, unless stated otherwise, the various images in this document prevent damage to these gears. show the disassembly and reassembly that results when the left-hand screw loosens. Complete Teardown, Cleaning, and Reassembly of the Olympus BH-2 Coaxial Focus Mechanism Revision 4 Page 12 of 40...

  • Page 13: Remove The Fine-Focus Thrust Washers

    (see Figure 20). Be careful when applying (see Figure 22). heat here so as to not melt or deform the plastic knob Complete Teardown, Cleaning, and Reassembly of the Olympus BH-2 Coaxial Focus Mechanism Revision 4 Page 13 of 40...

  • Page 14: Remove Stop Screw For The Pre-Focus Lock Collar

    (see Figure 24). If the fit of the 1.5mm Complete Teardown, Cleaning, and Reassembly of the Olympus BH-2 Coaxial Focus Mechanism Revision 4 Page 14 of 40...

  • Page 15: Figure 26 - The Loose Brass Shaft Mount

    If you elect to leave it in place, lock ring (see Figure 28). be careful with the solvent so that it doesn’t damage Complete Teardown, Cleaning, and Reassembly of the Olympus BH-2 Coaxial Focus Mechanism Revision 4 Page 15 of 40...

  • Page 16: Disassemble The Fine-Focus Gear Cluster

    33), are driven by the small pinion gear that is pressed into the underside of the right-hand fine-focus Figure 35 – Remove the brass gear-retaining ring knob (see Figure 16). Complete Teardown, Cleaning, and Reassembly of the Olympus BH-2 Coaxial Focus Mechanism Revision 4 Page 16 of 40...

  • Page 17: Figure 36 - The Gear-Retaining Ring Has Been Removed

    Finally, remove the bottom (left-most) drive gear from shaft. the gear-support base (see Figure 39). Complete Teardown, Cleaning, and Reassembly of the Olympus BH-2 Coaxial Focus Mechanism Revision 4 Page 17 of 40...

  • Page 18: Reassemble The Fine-Focus Gear Cluster

    Apply fresh grease to the top support pins of all three gear-support base (see Figure 44 for the proper drive gears (see Figure 47). orientation of the gear). Complete Teardown, Cleaning, and Reassembly of the Olympus BH-2 Coaxial Focus Mechanism Revision 4 Page 18 of 40...

  • Page 19: Withdraw The Coarse-Focus Shaft

    Figure 49 – Reinstall screws to secure gear-retaining ring the setscrew) while rotating the tool back and forth a Complete Teardown, Cleaning, and Reassembly of the Olympus BH-2 Coaxial Focus Mechanism Revision 4 Page 19 of 40...

  • Page 20: Remove The Setscrews

    Remove the metal wave washer from within the recess of the tension-adjustment knob (see Figure 55). Figure 52 – Withdraw pinion assembly from the pillar arm Complete Teardown, Cleaning, and Reassembly of the Olympus BH-2 Coaxial Focus Mechanism Revision 4 Page 20 of 40...

  • Page 21: Disassemble The Pinion Assembly

    Figure 59 – Bearing balls in the retaining-ring end The key word here is “gone”. Complete Teardown, Cleaning, and Reassembly of the Olympus BH-2 Coaxial Focus Mechanism Revision 4 Page 21 of 40...

  • Page 22: Clean And Reassemble The Pinion Assembly

    (see Figure 62). Figure 64 – Lower brass pinion mount over steel pinion Complete Teardown, Cleaning, and Reassembly of the Olympus BH-2 Coaxial Focus Mechanism Revision 4 Page 22 of 40...

  • Page 23: Reinstall The Tension Knob And Washers

    Complete Teardown, Cleaning, and Reassembly of the Olympus BH-2 Coaxial Focus Mechanism Revision 4 Page 23 of 40...

  • Page 24: Reinstall The Pinion Assembly Into The Pillar Arm

    Use a 1.5mm Allen tool or driver to start the two M3X5 setscrews into the tapped holes in the pillar arm casting Figure 71 – Snug the tension-adjustment knob Complete Teardown, Cleaning, and Reassembly of the Olympus BH-2 Coaxial Focus Mechanism Revision 4 Page 24 of 40...

  • Page 25: Reinstall The Coarse-Focus Shaft

    Figure 78 – Slide coarse-focus shaft into the hollow pinion play of the steel pinion. Apply blue Loctite® (item S2 of Complete Teardown, Cleaning, and Reassembly of the Olympus BH-2 Coaxial Focus Mechanism Revision 4 Page 25 of 40...

  • Page 26: Reassemble The Pre-Focus Stop Mechanism

    This step only applies if the threaded lock ring was removed during Lightly coat both sides of this washer with fresh grease disassembly. Complete Teardown, Cleaning, and Reassembly of the Olympus BH-2 Coaxial Focus Mechanism Revision 4 Page 26 of 40...

  • Page 27: Figure 83 - Reinstall Nylon Washer Onto End Of Pinion Mount

    Continue tightening the brass shaft mount onto Carefully engage the front loop of the coil spring with the coarse-focus shaft until you start to feel resistance. Complete Teardown, Cleaning, and Reassembly of the Olympus BH-2 Coaxial Focus Mechanism Revision 4 Page 27 of 40...

  • Page 28: Test The Pre-Focus Stop Mechanism

    (see Figure 87). Figure 86 – Reinstall setscrews to lock brass shaft mount Complete Teardown, Cleaning, and Reassembly of the Olympus BH-2 Coaxial Focus Mechanism Revision 4 Page 28 of 40...

  • Page 29: Reinstall The Left-Hand Coarse-Focus Knob

    Try to keep your mind out of the gutter for this part. Complete Teardown, Cleaning, and Reassembly of the Olympus BH-2 Coaxial Focus Mechanism Revision 4 Page 29 of 40...

  • Page 30: Reinstall The Second Fine-Focus Knob

    Figure 94 – Reinstall the top screw to hang the focus rack Figure 92 – Reinstall the fine-focus knob (left side shown) Complete Teardown, Cleaning, and Reassembly of the Olympus BH-2 Coaxial Focus Mechanism Revision 4 Page 30 of 40...

  • Page 31: Grease The Brass Focus Rack (Optional)

    The focus gearbox must be fully disassembled so that gearbox can be seen in the Figure the old grease can be thoroughly removed from the Complete Teardown, Cleaning, and Reassembly of the Olympus BH-2 Coaxial Focus Mechanism Revision 4 Page 31 of 40...

  • Page 32: Clean And Reassemble The Focus Gearbox

    (see Figure hand inside wall of the focus gearbox housing). 103) and wipe away any grease squeeze-out. Complete Teardown, Cleaning, and Reassembly of the Olympus BH-2 Coaxial Focus Mechanism Revision 4 Page 32 of 40...

  • Page 33: Figure 103 - Gear Pin And First Gear In Final Position

    (see Figure 107) and wipe away any grease left-hand side of the second gear (i.e., between the squeeze-out. Complete Teardown, Cleaning, and Reassembly of the Olympus BH-2 Coaxial Focus Mechanism Revision 4 Page 33 of 40...

  • Page 34: Reinstall The Focus Gearbox

    Use a 2.5mm Allen tool or driver to loosely reinstall the rack (see Figure 109). top two M3X10 hex socket-head cap screws and lock Complete Teardown, Cleaning, and Reassembly of the Olympus BH-2 Coaxial Focus Mechanism Revision 4 Page 34 of 40...

  • Page 35: Reinstall The Rear Cover

    Figure 115 – Reinstall rear cover onto back of pillar arm centered relative to its mounting screws (i.e., so that it Complete Teardown, Cleaning, and Reassembly of the Olympus BH-2 Coaxial Focus Mechanism Revision 4 Page 35 of 40...

  • Page 36: Reinstall The Fine-Focus Knob Caps

    The newly reconditioned microscope stand is now ready (see Figure 118). to be put back into service. Complete Teardown, Cleaning, and Reassembly of the Olympus BH-2 Coaxial Focus Mechanism Revision 4 Page 36 of 40...

  • Page 37: Original Olympus Documentation

    Olympus Research Microscopes Series BHS (BHS) Repair Manual Olympus Research Microscope BH2 Repair Manual Complete Teardown, Cleaning, and Reassembly of the Olympus BH-2 Coaxial Focus Mechanism Revision 4 Page 37 of 40...

  • Page 38: A Caution Regarding The Plastic Gears In The Olympus Bh-2

    BH-2 microscopes from occur. Figure 122 shows an example of what can shipping damage. happen to this fragile gear during shipping when the Complete Teardown, Cleaning, and Reassembly of the Olympus BH-2 Coaxial Focus Mechanism Revision 4 Page 38 of 40...

  • Page 39: An Alternate Method To Clear Adhesive From The Heads Of The Setscrews

    Complete Teardown, Cleaning, and Reassembly of the Olympus BH-2 Coaxial Focus Mechanism Revision 4 Page 39 of 40...

  • Page 40: Sources For Replacement Parts, Tools, And Supplies

    Local Phone Toll Free email Amazon www.amazon.com Harbor Freight Tools www.harborfreight.com 1-800-423-2567 Micro-Mark www.micromark.com 1-800-225-1066 1-908-665-9383 info@micromark.com Table 4 – Vendor Listing Complete Teardown, Cleaning, and Reassembly of the Olympus BH-2 Coaxial Focus Mechanism Revision 4 Page 40 of 40...

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