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Yamamoto 2651206407 YH65 LM500 BRP130 51206407 diaphragm 512 064 07 membrane Ingersollrand

Keeps your YH drifter accumulator sealed under pressure

This is the same diaphragm (part 51206407) that ships inside Ingersoll Rand YH series accumulators from the factory. It sits in the backhead assembly and takes the repeated flexing and pressure cycles that come with hard rock drilling. If your drifter is losing strike power or the accumulator won't hold charge, a worn diaphragm is often the culprit.

  • Fits: YH65, YH70s, YH80a, YH80rp, YH95
  • OEM part: No fitment headaches, no pressure bleed
  • Material: Elastomer built for hydraulic oil and high-cycle fatigue
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Yamamoto 2651206407 YH65 LM500 BRP130 51206407 diaphragm 512 064 07 membrane Ingersollrand
#249
Highlights
Key Advantages
  • Direct swap for the original Ingersoll Rand accumulator membrane — same dimensions, same bolt pattern, no shimming needed.
  • Works across five YH models: YH65, YH70s, YH80a, YH80rp, YH95, so one part number covers mixed fleets.
  • The elastomer compound holds up to continuous pressure swings and hot hydraulic oil without getting brittle or cracking early.
  • When this diaphragm goes, your accumulator stops doing its job — you feel it in slower penetration and uneven hammering.
  • Install it during your next backhead service; basic hand tools are all you need to get it seated and sealed.
Use Cases
Applications
  • YH65 drifters on surface and underground production rigs
  • YH70s drifters in tunnel face drilling and bolting
  • YH80a and YH80rp drifters on high-power long-hole rigs
  • YH95 drifters in quarry benches and heavy civil foundation work
  • Hydraulic accumulator backhead assemblies where part 51206407 is listed
Specs
Technical Specifications
Part number51206407
BrandIngersoll Rand / Yamamoto
TypeAccumulator diaphragm (membrane)
MaterialOil-resistant elastomer
ModelsYH65, YH70s, YH80a, YH80rp, YH95
Assembly locationBackhead accumulator
Details
Detailed Description
Yamamoto 2651206407 YH65 LM500 BRP130 51206407 diaphragm 512 064 07 membrane Ingersollrand

Brand :Ingersoll Rand
Part No. :51206407
Description :Diaphragm
Use in :Yh 65 , Yh 70s , Yh 80a , Yh 80rp , Yh 95

HYDRAULIC DRIFTER YH65 PARTS LIST
51525962 ASSEMBLY, BACKHEAD 42 50748334 CAP 1 51525970 BACKHEAD 43 51206415 O-RING 2 51206068 SUPPORTER, BLOW TUBE 44 51206423 BOLT 3 51206076 O-RING 51206431 ASSBLY, HYDRAULIC MOTOR 4 51206084 O-RING 45 51205508 MOTOR, ROTATION 5 51176477 PIN, SPRING 51206449 O-RING 6 51206092 PLUG 46 51206449 O-RING 7 51206100 PLUG 47 51176808 O-RING 8 51176493 ADAPTER 48 51206456 ADAPTER 9 51166056 ADAPTER, HOSE 49 51329308 CAPSCREW 10 51208478 BUSHING 51525988 ASSBLY, GEAR BOX 11 51208460 BUSHING 50 51525999 BOX, GEAR 12 51162212 SEAL 51 51206498 BUSHING 13 50748250 SEAL 52 51206084 O-RING 51206126 ASSBLY, BACKHEAD GLAND 53 51176477 PIN, SPRING 14 51206134 GLAND, BACKHEAD 51206514 ASSBLY, DRIVE GEAR 15 50748250 SEAL 54 51206522 GEAR, DRIVE 16 51206639 ADAPTER 55 50781962 BEARING, BALL 17 51176543 NUT, HOSE 51206530 ASSBLY, IDLER GEAR 18 51103778 O-RING 56 51206548 GAER, IDLER 51206159 ASSBLY BLOW TUBE 57 51206555 BEARING, NEEDLE 19 51206142 BLOW TUBE 58 51206597 SHAFT, GEAR 20 51206167 RUBBER 59 51206605 O-RING 21 51206175 RUBBER HOLDER 51206613 ASSBLY, COVER 51206183 CYLINDER ASSBLY 60 51206621 COVER 22 51206191 CYLINDER 61 51206415 O-RING 23 51104222 O-RING 62 50945385 BOLT 24 51206217 O-RING 51537165 ASSBLY, DRIVER 51206225 ASSBLY, CYLINDER LINER 63 51206662 DRIVER, CHUCK 25 51206233 LINER, CYLINDER 64 51533107 SET, BUSHING 26 51206241 SEAL STЕР 51537157 ASSBLY, CHUCK END 51206258 ASSBLY BACK LINER 65 51526010 END, CHUCK 27 51206266 BACK LINER CYLINDER 66 51206704 O-RING 28 51206076 O-RING 67 51206712 BUSHING 29 51206282 SEAL, STEP 68 51298636 CHUCK 30 51206308 SEAL, SLIPPER 51537173 ASSBLY, CAP 31 51206316 GUIDE, VALVE 69 51206746 CAP, CHUCK END 32 51206324 VALVE 70 51533115 LINER, CАР 33 51206332 PISTON 71 51104248 O-RING 51206340 ASSBLY, FRONT LINER 51206779 ASSBLY, BOLT 34 51206357 LINER, FRONT 72 50944990 BOLT 35 51206365 O-RING 73 51206787 NUT, NYLON 36 51206373 RING, WIPER 51206829 ASSBLY, EYE BOLT 51155125 ASSBLY, ACCUMALATOR 76 51206837 BOLT EYE 37 51206381 BODY 77 51206845 PLATE, HOOK 38 51206399 COVER 78 51206852 BOLT 39 51206407 DIAPHRAGM 79 50855923 WASHER, SPRING 40 51176741 VALVE 80 51525947 SIDE ROD 41 51176758 WASHER, SEAL 81 51275063 O-RING 82 51525954 NUT FOR SIDE ROD
FAQ
FAQ
How do I know if the diaphragm is failing?
Common signs: accumulator won't hold pre-charge, drifter hits softer than usual, or you see erratic pressure readings on the rig display. Pull the backhead and check for cracks, pin holes, or a collapsed shape — any of those mean it's time to swap it out.
Will this fit a YH70s and a YH95 without modifications?
Yes. Ingersoll Rand used the same accumulator design across YH65, YH70s, YH80a, YH80rp and YH95, so one 51206407 diaphragm fits them all without any cutting or adapters.
Is this an OEM part or aftermarket?
It's a genuine Ingersoll Rand-supplied diaphragm, made to the factory drawing and material spec. Comes in OEM packaging under part number 51206407.
How many hours should I run between diaphragm changes?
We see most crews replace it somewhere between 800 and 1,200 hours, depending on percussion hours and how hard the ground is. If you're already into the backhead for a seal kit, check the diaphragm and save a second teardown later.
What's the lead time if I order now?
These are normally in stock. Small orders ship same or next business day; bulk quantities might need 1–2 days to consolidate. Express shipping is available if you're down and need it fast.
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