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Komatsu PC600LC-6A / PC600-6A Hydraulic Bucket Cylinder | PN:21M-70-00111 / 21M-63-02140 | Premium Aftermarket Replacement
1. Basic Product Info
High-quality aftermarket hydraulic bucket cylinder with dual interchangeable OEM part numbers 21M-70-00111 and 21M-63-02140, specially designed as a direct replacement for Komatsu PC600LC-6A and PC600-6A heavy-duty excavators. This cylinder is responsible for controlling the curling and dumping movements of the bucket, widely applied in mining sites, stone quarries, large-scale earthmoving and heavy infrastructure construction. Manufactured strictly in accordance with original Komatsu technical drawings, it features identical lug dimensions, pin spacing and hydraulic port layout, enabling direct bolt-on installation without any on-site cutting, welding or modification.
| Item |
Specification |
| Product Name |
Hydraulic Bucket Cylinder |
| Applicable Model |
Komatsu PC600LC-6A, PC600-6A |
| OEM Part Number |
21M-70-00111, 21M-63-02140 |
| Product Grade |
Brand New Premium Aftermarket |
| Warranty |
12 months against manufacturing defects |
| MOQ |
1 unit available from stock |
| QC Standard |
ISO9001 certified, full hydraulic pressure and cyclic testing before delivery |
2. Core Technical Parameters
| # |
Part No. |
Description |
Qty |
| G-1 |
(21M-63-X2140) |
BUCKET CYLINDER G |
1 |
| ---- |
---- |
==================== |
|
| 1 |
21M-63-02140 |
BUCKET CYLINDER A |
1 |
| 1 |
21M-63-72240 |
Cylinder |
1 |
| 2 |
707-76-11130 |
Bushing |
1 |
| 3 |
07145-00110 |
SEAL,DUST (KIT) |
2 |
| 4 |
07043-00108 |
PLUG,(WITHOUT OIL PRESSURE SWITCH) |
1 |
| 5 |
21M-63-72220 |
Rod |
1 |
| 6 |
707-76-11130 |
Bushing |
1 |
| 7 |
07145-00110 |
SEAL,DUST (KIT) |
2 |
| 8 |
07020-00000 |
FITTING, GREASE - UPPER HINGE PIN |
1 |
| 9 |
07043-00108 |
PLUG,(WITHOUT OIL PRESSURE SWITCH) |
1 |
| 10 |
707-71-32930 |
COLLAR |
1 |
| 11 |
707-27-18960 |
HEAD,CYLINDER |
1 |
| 12 |
195-63-93170 |
SEAL,DUST (KIT) |
1 |
| 13 |
07179-13136 |
RING, SNAP |
1 |
| 14 |
707-52-90980 |
Bushing |
1 |
| 15 |
707-51-12030 |
PACKING,ROD (KIT) |
1 |
| 16 |
707-51-12630 |
RING,BUFFER (KIT) |
1 |
| 17 |
707-35-91840 |
RING,BACK-UP (KIT) |
3 |
| 18 |
07000-15175 |
O-RING (KIT) |
2 |
| 19 |
01011-82400 |
BOLT (OP) |
12 |
| 20 |
707-88-75410 |
Washer |
12 |
| 21 |
707-71-61320 |
PLUNGER |
1 |
| 22 |
707-36-18520 |
Piston |
1 |
| 23 |
01310-01225 |
Screw |
1 |
| 24 |
707-44-18280 |
RING,PISTON (KIT) |
1 |
| 25 |
707-39-18830 |
RING,WEAR (KIT) |
2 |
| 26 |
707-44-18920 |
RING (KIT) |
2 |
| 27 |
07001-05110 |
RING,BACK-UP (KIT) |
2 |
| 28 |
07000-15110 |
O-RING (KIT) |
1 |
| 29 |
21M-63-72270 |
Tube |
1 |
| 30 |
21M-63-72280 |
Tube |
1 |
| 31 |
01435-01055 |
BOLT, MOUNT DRYER TO BRACKET AND FRAME |
8 |
| 32 |
07000-13035 |
O-RING, UPPER COOLER INLET AND OUTLET PORTS |
2 |
| 33 |
707-88-22030 |
Bracket |
1 |
| 34 |
707-88-21050 |
BAND |
1 |
| 35 |
209-63-73592 |
Bracket |
1 |
| 36 |
707-88-21060 |
BAND |
1 |
| 37 |
01010-81240 |
BOLT,FOR WEIGHT ADJUSTING BOLT |
8 |
| 38 |
01643-51232 |
WASHER, (WITHOUT EMERGENCY STEERING) |
8 |
| 39 |
07283-23442 |
CLIP,(WITH UNDER MIRROR) |
3 |
| 40 |
01599-01011 |
NUT,(WITH UNDER MIRROR) |
6 |
| 41 |
01643-31032 |
WASHER,(WITH AUTO EMERGENCY STEERING) |
6 |
| 42 |
707-88-33040 |
CAP,SLEEVE (FOR SHIPPING) |
1 |
| 43 |
07371-31049 |
FLANGE, SPLIT - DIVIDER VALVE END |
2 |
| 44 |
07372-21035 |
BOLT, SPLIT FLANGE - TORQUE CONVERTER END |
4 |
| 45 |
01643-51032 |
WASHER, (WITHOUT EMERGENCY STEERING) |
4 |
| 46 |
07000-13038 |
O-RING, (WITHOUT EMERGENCY STEERING) |
1 |
| 47 |
07378-11210 |
HEAD,(FOR SHIPPING) |
1 |
| 48 |
07371-51260 |
FLANGE,(FOR BACKHOE) |
2 |
| 49 |
01010-81245 |
BOLT, MOUNTING CRANKING MOTOR |
4 |
| 50 |
01643-31232 |
WASHER,(NOT USED WITH EMERGENCY STR.) |
4 |
| ---- |
---- |
==================== |
|
| K |
707-99-68560 |
SERVICE KIT |
1 |
| Spec Item |
Data |
| Bore Diameter |
140mm |
| Piston Rod Diameter |
95mm |
| Working Stroke |
1010mm |
| Rated Working Pressure |
31.9MPa |
| Factory Test Pressure |
47.9MPa (1.5 times rated working pressure) |
| Barrel Material |
High-tensile seamless alloy steel with precision inner honing treatment |
| Piston Rod |
40CrMo quenched & tempered steel, 28~32μm hard chrome plating, surface hardness HRC68~72, anti-bending and anti-abrasion |
| Matching Seal Kit PN |
21M-70-00111K |
| Working Temperature |
-25℃ ~ +85℃ |
| Overall Weight |
Approx. 650kg |
| Structure |
Double ear lugs fitted with quenched copper wear-resistant bushings, built-in buffer structure to reduce impact load |
3. Product Advantages
- Complete OEM Interchangeability: Fully consistent with original spare parts in all dimensions and structures, perfectly matching the original bucket linkage and hydraulic pipeline of PC600LC-6A/PC600-6A. No extra adjustment is needed after installation.
- Mining-Grade Reinforced Structure: The cylinder barrel and lug base are thickened and strengthened, which can withstand long-term heavy loads and frequent impact from rocks. It adapts to harsh working conditions of mines and quarries effectively.
- Strict Pre-delivery Inspection: Every finished cylinder undergoes full-stroke reciprocating cycle test and high-pressure tightness test, thoroughly eliminating hidden troubles of internal and external oil leakage.
- High Cost Performance: It delivers the same stable working performance and service life as genuine Komatsu parts, while cutting 40%~50% procurement cost for spare parts dealers and maintenance workshops.
- Flexible Logistics Solution: All products are in stock and can be dispatched within 3 working days. Air freight is available for urgent orders (3~7 days delivery), and sea freight is recommended for bulk wholesale (30~40 days delivery).
4. Supplier Brief
Our factory has specialized in manufacturing hydraulic cylinders for Komatsu large and medium-sized excavators for over 11 years. We provide a full range of boom, arm and bucket cylinders for PC400, PC600, PC800 and PC1250 series. Our products have passed ISO9001 quality certification and are widely exported to mining areas, Southeast Asia, Africa and Middle East aftermarket spare parts markets, winning recognition from global customers.
5. FAQ
Q1: Can this bucket cylinder fit PC600-7 or other upgraded models?
A: No. PC600-7 series adopts different part numbers and installation dimensions, which are not interchangeable with this product. Please confirm the excavator model and serial number before ordering.
Q2: Does the standard package include the seal repair kit?
A: The standard cylinder does not come with a seal kit. The matching repair seal kit 21M-70-00111K can be purchased separately, and you can enjoy a favorable bundled price when ordering together.
Q3: What kind of packaging is used for long-distance ocean transportation?
A: We fill anti-rust hydraulic oil inside the cylinder barrel, coat the piston rod with anti-rust grease, wrap the whole product with waterproof PE film, and finally pack it into solid export-grade plywood case to prevent rust and damage during long-distance sea transit.
Q4: Will there be a better discount if I order boom, arm and bucket cylinders as a full set?
A: Yes. Combined orders for full set cylinders enjoy tiered unit price discount, and we can arrange consolidated shipment to help you save total logistics cost.
Q5: What support can I get if oil leakage occurs within the warranty period?
A: Please take clear photos of the leakage position and provide the serial number of your excavator. We will arrange free replacement of seal parts or offer professional remote installation and troubleshooting guidance.
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