SKU SK-KOM-PC50-ARM
Komatsu PC50MR-2 Arm Cylinder Seal Kit
completeFull service kitwire ring gland
85 mm bore, 50 mm rod arm cylinder kit. Same wire-ring gland as the boom cylinder.
What's in this kit
Every seal in the kit, with its material and size.
| # | Qty | Part | Material | ID | OD / cross-section | Height | Shore A |
|---|---|---|---|---|---|---|---|
| 1 | 1 | Rod sealRS-M50-M62-M8 · polypak | Polyurethane | 50 mm (1.9685") | 62 mm (2.4409") | 8 mm (0.315") | 90 |
| 2 | 1 | Buffer sealBS-M50-M62-M6 · buffer | PTFE / NBR | 50 mm (1.9685") | 62 mm (2.4409") | 6 mm (0.2362") | — |
| 3 | 1 | WiperWP-M50-M60-M7 · dust wiper | Polyurethane | 50 mm (1.9685") | 60 mm (2.3622") | 7 mm (0.2756") | 90 |
| 4 | 1 | Rod bushingRB-M50-M54-M10 · guide band | Bronze-filled PTFE | 50 mm (1.9685") | 54 mm (2.126") | 10 mm (0.3937") | — |
| 5 | 1 | Piston sealPS-M65-M85-M10 · t-seal | Polyurethane | 65 mm (2.5591") | 85 mm (3.3465") | 10 mm (0.3937") | 90 |
| 6 | 1 | O-ringOR-M65-M4 · energizer | Nitrile (NBR) | 65 mm (2.5591") | 3.53 mm (0.139") | — | 70 |
| 7 | 2 | Wear ringWR-M79-M85-M12 · guide band | Bronze-filled PTFE | 79 mm (3.1102") | 85 mm (3.3465") | 12 mm (0.4724") | — |
| 8 | 1 | O-ringOR-M88-M4 · gland seal | Nitrile (NBR) | 88 mm (3.4646") | 3.53 mm (0.139") | — | 90 |
| 9 | 2 | Backup ringBU-M88-M95-M2 · backup | Nylon | 88 mm (3.4646") | 95 mm (3.7402") | 1.5 mm (0.0591") | — |
Cylinders this kit services
Komatsu PC50MR-2 Arm Cylinder
- OEM no.
- 707-99-48100
- Bore
- 85 mm (3.3465")
- Rod
- 50 mm (1.9685")
- Stroke
- 800 mm (31.4961")
- Gland
- wire ring
- Port
- Code 61 flange
- Rod eye
- spherical bearing
What this fits
| Machine | Serial range | Position |
|---|---|---|
| Komatsu PC50MR-2 | All serials | Arm / Dipper |
Our kits are dimensional equivalents built from seals we buy in. They fit and replace the original. They are not OEM parts and carry no OEM branding.
Not finding it?
Not sure this is right?
Check it with a caliper before you buy — how to measure bore, rod and stroke covers the mistakes behind most wrong orders. Send us the numbers and a photo of the old seals and we’ll confirm the fit before you spend anything.
Request a kit