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86633963 Montabert HC50 nitrogen diaphragm set 866 339 63 membrane kits drifter parts cup

Keep Your HC50 Drifter’s Percussion Tight with This Stock Nitrogen Diaphragm

Montabert HC50 Nitrogen Diaphragm Set – Part 86633963 (866 339 63)

Sloppy sealing in the accumulator side of your HC50 doesn’t just kill impact power—it drives up operating cost per meter. This stock Montabert membrane kit is a straight swap into the Atlas Copco Epiroc COP MD20 drifter, helping your hammer hold charge and punch consistently through hard rock.

  • Molded elastomer that handles high-frequency flex without cracking early
  • Shape and dimensions match the factory pocket, so it drops in without wrestling
  • Steady nitrogen pre-load means fewer pressure top-ups between shifts
  • Weighs only 0.05 kg—shelf-ready and ships same day from stock
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86633963 Montabert HC50 nitrogen diaphragm set 866 339 63 membrane kits drifter parts cup
#314
Highlights
Key Advantages
  • Stock Montabert number 86633963 (also listed as 866 339 63) – no long lead-time guessing
  • Slides right into HC50 drifters and COP MD20 accumulator housings the same way the original does
  • Kit includes the main diaphragm/cup seal that keeps nitrogen where it belongs, not bleeding into hydraulics
  • Tested in high-cycle rock drilling fleets—holds up to the fatigue that chews through softer membranes
Use Cases
Applications
  • Underground drifting and tunneling with Montabert HC50 rock drills
  • Quarry benching and construction drilling running Atlas Copco COP MD20 drifters
  • Workshop stock for fleet-wide drifter accumulator rebuilds
  • Replacing swollen, stiff, or cracked diaphragms that won’t hold pre-charge
Specs
Technical Specifications
BrandMontabert
Part Number86633963 / 866 339 63
DescriptionDiaphragm Kit
Compatible ModelHC 50 / COP MD20
Unit Weight0.05 kg
Stock StatusReady to ship
Details
Detailed Description
Brand :Montabert
Part No. :86633963
Description :Diaphragm Kit
Use in :Hc 50
Weight：0.05kg
In stock

ROCK DRILL of Atlas Copco Epiroc COP MD20

Parts NO.

Name

83111200168311 1200 16 – ROCK DRILL
31155802403115 5802 40 – FRONT PART COMP
31155572823115 5572 82 – FLUSH HEAD COMP
31155571813115 5571 81 – GUIDE COMPL.

3115557381

3115 5573 81 – GUIDE COMPL.

3115600076

3115 6000 76 – GEAR HOUS. COMP

31155813403115 5813 40 – CYLINDER COMPL.
31156000933115 6000 93 – ACCUMULAT. ASSY
31156000943115 6000 94 – ACCUMULAT. ASSY
31156002433115 6002 43 – SEAL HOUSE COMP
31156002503115 6002 50 – SEAL HOUSE COMP
31156001683115 6001 68 – TOOLS AND ACC.

3115901183

3115 9011 83 – FRONT SEAL KIT

31159011843115 9011 84 – SEAL KIT
31159011853115 9011 85 – MINOR KIT
31159011863115 9011 86 – MAJOR KIT
31155844303115 5844 30 – FIXTURE
31156001923115 6001 92 – CHARGIN DEVICE
31155509833115 5509 83 – ROTATION MOTOR

3115376601

3115 3766 01 – DOME NUT

31766517003176 6517 00 – NIPPLE
31766512003176 6512 00 – NIPPLE
06863716350686 3716 35 – PLUG
06863716060686 3716 06 – PLUG
06611038000661 1038 00 – SEAL WASHER

0661102600

0661 1026 00 – SEAL WASHER

0663916900

0663 9169 00 – LABEL SET

31152231003115 2231 00 – DRILL COLLAR
31280003203128 0003 20 – HOSE ASSEMBLY
01471419030147 1419 03 – SCREW, HEX HEAD
31156003143115 6003 14 – SEAL SPRING
01081291000108 1291 00 – PIN
31155571813115 5571 81 – GUIDE COMPL

3115557381

3115 5573 81 – GUIDE COMPL

31155569003115 5569 00 – STOP RING
31155575003115 5575 00 – PLUG
31155574023115 5574 02 – CONNECT. PLATE
06632141000663 2141 00 – O-RING
31153289023115 3289 02 – SEAL RING

0147136303

0147 1363 03 – SCREW, HEX HEAD

03335200140333 5200 14 – LOCK WASHER
05442162000544 2162 00 – GREASE NIPPLE
06636137000663 6137 00 – O-RING
31153289053115 3289 05 – SEAL RING
06869110000686 9110 00 – PROTECTION PLUG

3115336300

3115 3363 00 – CUP SEAL

06632101680663 2101 68 – O-RING
31153282033115 3282 03 – WIPER
31155584003115 5584 00 – WASHER
31155586013115 5586 01 – NUT
31155606003115 5606 00 – SEAL

3115566100

3115 5661 00 – SPACER

06636152000663 6152 00 – O-RING
31156001653115 6001 65 – SUPPORT RING
05090225000509 0225 00 – ROLLER BEARING
31156001663115 6001 66 – DRIVER

3115600162

3115 6001 62 – ROT.CHUCK

05090222000509 0222 00 – ROLLER BEARING
31156001613115 6001 61 – RING
31155577043115 5577 04 – RING

Parts NO.

Name

31155664003115 5664 00 – SPACER
31155607003115 5607 00 – SEAL
31155565013115 5565 01 – WAVE SPRING
31156000583115 6000 58 – ROT.CH.BUSHING
6636143000663 6143 00 – O-RING

3115600178

3115 6001 78 – SEAL KIT

31153289303115 3289 30 – SEAL RING
31153289363115 3289 36 – SEAL RING
31155900003115 5900 00 – LINER
31156000063115 6000 06 – DAMPING PISTON
31156001793115 6001 79 – SEAL KIT

3115566505

3115 5665 05 – RING

31155481003115 5481 00 – STUD
1020458000102 0458 00 – PIN
31153649003115 3649 00 – WASHER
5164047000516 4047 00 – NEEDLE BEARING
5164100260516 4100 26 – INNER RING

515310306

0515 3103 06 – NEEDLE BEARING

2111957550211 1957 55 – HEX SOCK. SCREW
31153290023115 3290 02 – SEAL RING
31155807003115 5807 00 – SEAL
31156001633115 6001 63 – GEAR WHEEL
31155663003115 5663 00 – SPACER

3115245100

3115 2451 00 – SLIDE WASHER

31155813403115 5813 40 – CYLINDER COMPL.
31156000933115 6000 93 – ACCUMULAT. ASSY
31155805053115 5805 05 – BACK HEAD
31155790053115 5790 05 – PISTON
31155602053115 5602 05 – VALVE LINER

3115576401

3115 5764 01 – PISTON GUIDE

31156000943115 6000 94 – ACCUMULAT. ASSY
31155893003115 5893 00 – LINER
31156001223115 6001 22 – VALVE PISTON
31156000053115 6000 05 – PLUNGER
31155596073115 5596 07 – VALVE COVER

3115559705

3115 5597 05 – VALVE COVER

1471480030147 1480 03 – SCREW, HEX HEAD
31153289243115 3289 24 – SEAL RING
31153289353115 3289 35 – SEAL RING
31153289173115 3289 17 – SEAL RING
6650900140665 0900 14 – SEAL RING
31153290103115 3290 10 – SEAL RING

663990022

0663 9900 22 – SEAL RING

31156001803115 6001 80 – SEAL KIT
3012378000301 2378 00 – PLAIN WASHER
31153290163115 3290 16 – SEAL RING
6632103060663 2103 06 – O-RING
31156000123115 6000 12 – PISTON GUIDE

3115328922

3115 3289 22 – SEAL

31153289373115 3289 37 – SEAL RING
31155810003115 5810 00 – SEAL
31156000073115 6000 07 – WAVE SPRING
31155566023115 5566 02 – WAVE SPRING
06650900150665 0900 15 – SEAL RING

0102045800

0102 0458 00 – PIN

31155808003115 5808 00 – SEAL
31155809003115 5809 00 – SEAL
31151746083115 1746 08 – NOZZLE
31155166083115 5166 08 – NOZZLE
31156001813115 6001 81 – SEAL KIT
FAQ
FAQ
Will this diaphragm fit both Montabert HC50 and COP MD20 drifters?
Yes. The 86633963 is the factory-spec membrane used in the HC50 and is also the standard drop-in for Atlas Copco Epiroc COP MD20 accumulators. Before ordering, cross-check your serial number or send us a photo of the old part so we can double-check fitment.
How do I know when the nitrogen diaphragm is failing?
You’ll notice the drifter hits with less punch, the nitrogen pre-charge drops faster than normal between checks, or you see oil foaming in the accumulator. If the cup feels hard or shows surface crazing during a visual inspection, it’s time to swap.
Does the kit come with backup rings or just the diaphragm?
This kit centers on the main diaphragm/cup seal. If you need the full accumulator seal stack—like O-rings and backup washers—reach out and we’ll put together the exact set for your serial number.
Real OEM Montabert or aftermarket?
Genuine Montabert part, built to the same material spec and cure process as the original. No aftermarket shortcuts.
What’s a typical service life we can expect?
In medium abrasive ground, most crews get 500–1000 impact hours before the diaphragm starts to degrade. It really depends on pre-charge discipline and how often the drifter sees peak pressure. Inspect during your regular drifter PM; if it looks stiff or cracked, replace it early and skip the midnight breakdowns.
Stock
Check Stock & Get a Quote
Talk to our rock drill parts desk about stocking up on 86633963 HC50 diaphragm kits, urgent dispatch, or a full drifter seal package. We’ll work out the shipping details once you drop us a message.
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