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PC75UU-2 Hydraulic Boom Cylinder for Komatsu Excavator Spare Parts 21W-63-02131 Aftermarket High Quality
Aftermarket boom cylinder exclusively for Komatsu PC75UU-2 Mini Excavator (S/N:5001 and above), OEM part number: 21W-63-02131, interchange alternative part:21W-63-02210/21W-63-02310, direct replacement original boom cylinder for lifting boom arm in earthmoving, landscaping, small quarry operation. 1:1 OEM dimension for direct bolt-on installation without modification.
| Item | Parameter |
|---|---|
| Product Name | Boom Hydraulic Cylinder |
| Applicable Model | Komatsu PC75UU-2 |
| OEM PN | 21W-63-02131 |
| Quality Class | Premium Aftermarket New |
| Warranty | 12 months against manufacturing defects |
| MOQ | 1pc available from stock |
| QC Standard | ISO9001 certified, full high-pressure airtight test before shipment |
| # | Part No. | Description | Qty |
|---|---|---|---|
| G-1 | (21W-63-X2310) | CYLINDER GROUP,BOOM | 1 |
| G | (21W-63-X2131) | CYLINDER GROUP,BOOM | 1 |
| ---- | ==================== | ||
| 1 | 21W-63-02310 | CYLINDER ASS'Y,BOOM | 1 |
| 1 | 21W-63-02131 | CYLINDER ASS'Y,BOOM | 1 |
| 1 | 21W-63-56840 | CYLINDER,BOOM | 1 |
| 1 | 21W-63-56541 | CYLINDER,BOOM | 1 |
| 2 | 707-76-65170 | Bushing | 1 |
| 3 | 07145-00065 | SEAL,DUST? PISTON ROD | 2 |
| 4 | 07020-00000 | FITTING, GREASE - UPPER HINGE PIN | 1 |
| 5 | 707-29-12850 | HEAD, CYLINDER | 1 |
| 5 | 707-29-12350 | HEAD,CYLINDER | 1 |
| 6 | 707-52-10700 | Bushing | 1 |
| 7 | 707-51-70211 | PACKING,(Y1621-01A0-9) | 1 |
| 8 | 144-63-95170 | SEAL,OIL? CYLINDER HEAD | 1 |
| 9 | 07179-12084 | RING, SNAP | 1 |
| 10 | 07000-12115 | O-RING,(Y1621-01A0-10) | 1 |
| 10 | 07000-12115 | O-RING,(Y1621-01A0-10) | 2 |
| 11 | 07146-02116 | RING,(Y1621-01A0-11) | 1 |
| 11 | 07146-02116 | RING,(Y1621-01A0-11) | 3 |
| 12 | 07000-02120 | O-RING,COVER? TRANSFER CASE | 1 |
| 13 | 21W-63-56820 | ROD,PISTON | 1 |
| 13 | 21W-63-56520 | ROD,PISTON | 1 |
| 14 | 707-76-65330 | Bushing | 1 |
| 14 | 707-76-65270 | Bushing | 1 |
| 15 | 07145-00065 | SEAL,DUST? PISTON ROD | 2 |
| 16 | 707-71-60780 | PLUNGER | 1 |
| 17 | 707-40-11370 | Spacer | 1 |
| 18 | 707-36-12170 | Piston | 1 |
| 19 | 707-44-12180 | RING,(Y1621-01A0-14) | 1 |
| 20 | 07156-01215 | RING,(Y1621-01A0-15) | 1 |
| 21 | 07165-15252 | NUT, NYLOCK | 1 |
| 22 | 21W-63-56870 | Tube | 1 |
| 22 | 21W-63-56570 | Tube | 1 |
| 23 | 21W-63-56582 | Tube | 1 |
| 23 | 21W-63-56581 | Tube | 1 |
| 24 | 01010-51020 | BOLT,(FOR QUICK SHIFT) (MITSUBISHI) | 1 |
| 25 | 01643-31032 | WASHER,(WITH AUTO EMERGENCY STEERING) | 1 |
| 26 | 07283-22236 | U-BOLT, TUBE CLAMP | 1 |
| 27 | 01599-01011 | NUT,(WITH UNDER MIRROR) | 2 |
| 28 | 01643-31032 | WASHER,(WITH AUTO EMERGENCY STEERING) | 2 |
| ---- | ==================== |
| Spec | Data |
|---|---|
| Cylinder Bore | 120mm |
| Piston Rod Dia | 70mm |
| Rated Working Pressure | 32MPa |
| Factory Test Pressure | 48MPa (1.5×working pressure) |
| Tube Material | ST52 seamless steel, precision inner honing |
| Piston Rod | 40Cr quenched+tempered, hard chrome plating 30μm, HRC67~70 wear-resistant |
| Matching Seal Kit PN | 707-98-43200 |
| Working Temp | -25℃~+85℃ |
| Structure | Double lug with copper bushing, built-in end buffer cushion |
- Perfect OEM interchange: Same pin hole spacing, oil port position and overall length as genuine Komatsu spare part, compatible with original hydraulic pipeline and boom assembly.
- Mini excavator reinforced design: Thickened ear root to prevent crack under frequent bump load for municipal & farm construction site.
- Strict factory inspection: Full-stroke reciprocating test + high pressure leak detection to eliminate inner/outer oil leakage.
- Cost saving: 40%-48% lower cost than original Komatsu cylinder with equivalent service life, ideal for global spare parts wholesaler & repair shop.
- Flexible delivery: In-stock goods ship within 3 working days; urgent order by air (3-7 days), bulk order by sea (30-38 days).
Factory focus on Komatsu mini excavator hydraulic cylinder over 10 years, complete boom/arm/bucket cylinder lineup covering PC50UU/PC60-7/PC75UU series, products mainly exported to Southeast Asia, Africa, Middle East aftermarket market.
Q1: Fit PC75UU-3?
A: No, PC75UU-3 uses different part number 21W-63-02161, dimension mismatch.
Q2: Seal kit included in standard package?
A: Standard cylinder without seal set; matching repair kit available with bundle discount when ordering together.
Q3: Export packing?
A: Inner anti-rust oil filling, rod anti-rust grease coating, PE wrap + solid plywood case for long ocean transportation.
Q4: Discount for full set 3pcs(boom+arm+bucket cylinder)?
A: Tiered wholesale discount + combined shipment to cut total freight cost.
Q5: Aftersales for leakage during warranty?
A: Submit leakage photo + machine serial number, free replacement seal kit or remote installation guidance provided.
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