878000607 Boom Cylinder Seal Kit for Komatsu PC95R-2 Excavator
The Komatsu PC95R-2 is a crawler midi excavator (approx. 8.75–9.36 t operating weight, 61.5 kW) engineered for tight spaces and hard-to-reach areas, with a swing offset boom (source: Komatsu Europe product archive). Its boom cylinder carries the main lifting and digging load — when the rod or piston seal wears, the first signs are external oil film on the rod, boom drift under load, and reduced digging power.
This listing is a new aftermarket seal kit for the 878000607 boom cylinder application on the PC95R-2. Independent aftermarket catalogs list it with a 70 mm rod and 120 mm bore and cross-reference it as HYI40-0582. A typical kit for this application includes a wiper, U-cup rod seal, buffer seal, O-rings, wear bands, rod seals, T-seal and backup seals (kit contents per O-ringsandMore); confirm the exact component count with our sales team if your rebuild spec differs.
Materials: the kit is manufactured with hydraulic sealing compounds selected for excavator duty. Exact compound grades are confirmed per production batch — request the material data sheet with your order.
Verified Specs
| Parameter | Value / Verification |
| Part Number | 878000607 (cross-ref HYI40-0582) — ReliableAftermarketParts, Zoro |
| Brand / Machine | Komatsu PC95R-2 crawler midi excavator — Komatsu EU (official) |
| Cylinder Application | Boom — O-ringsandMore, BulldogKits |
| Rod Diameter | 70 mm — O-ringsandMore |
| Bore Diameter | 120 mm — O-ringsandMore |
| Reference S/N Range | 21D5220114 – 21D5220430 (boom) — BulldogKits, TornadoParts |
| Condition | New, aftermarket replacement — Multiple suppliers |
Confirmed / Reference Fitment
•Confirmed: Komatsu PC95R-2 — boom cylinder (O-ringsandMore, ReliableAftermarketParts, TornadoParts).
•Reference: serial range 21D5220114 – 21D5220430 per aftermarket catalogs — verify against your machine plate.
•Related (not included): arm cylinder kit 878000425 is a separate kit.
Fitment Checklist
1.Machine model: Komatsu PC95R-2 (confirm the full model including dash number).
2.Cylinder position: Boom (this kit does not cover the arm or bucket cylinder).
3.Measure: rod ≈ 70 mm, bore ≈ 120 mm with calipers.
4.Note your machine S/N and compare with reference range 21D5220114 – 21D5220430.
5.Check the previous kit P/N (878000607 or HYI40-0582) if available.
When to Inspect / Replace
•Oil film or drips on the boom cylinder rod / gland area.
•Boom drift or slow, jerky lifting under load.
•Scored, pitted or chromed-worn rod surface.
•Milky or contaminated hydraulic oil.
Replacing seals without fixing rod scoring, a bent rod, or contaminated oil will shorten kit life.
Wholesale & MOQ
Factory-direct supply for distributors, repair shops and fleet operators. Wholesale MOQ: 5 kits. Email [email protected] with your quantity, shipping port and destination for a same-day quote. Custom packaging and private labeling available.
FAQ
Will this fit the PC95R-2 with the swing offset boom? — The kit covers the boom cylinder; Komatsu lists the PC95R-2 with a swing offset boom. Confirm your rod/bore (70 mm / 120 mm) before ordering.
Is HYI40-0582 the same part? — Yes. Several aftermarket suppliers list HYI40-0582 as a cross reference for the 878000607 boom cylinder kit.
Do you also supply the arm cylinder kit 878000425? — Yes, we carry companion cylinder kits. Email [email protected] for the arm kit number and wholesale pricing.
Komatsu PC95R-2 seal kit
878000607
Komatsu boom cylinder seal kit
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