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EX370-5 Hydraulic Bucket Cylinder for Hitachi Excavator | PN:9173706 | Premium Aftermarket Replacement
1. Basic Product Info
This high-grade aftermarket hydraulic bucket cylinder serves as a reliable replacement unit designed exclusively for Hitachi EX370-5 excavators. As a key hydraulic component of the working attachment, it drives the bucket to perform digging, material scooping and dumping operations, which is widely applicable to river regulation, general earthmoving, construction site development and medium-to-large scale engineering projects. All products are manufactured strictly in accordance with Hitachi original OEM technical drawings and production criteria, featuring identical installation dimensions, pin pitch and hydraulic port layout. Field personnel can carry out direct bolt-on installation without cutting, welding or any extra modification work on site.
| Item |
Specification |
| Product Name |
Hydraulic Bucket Cylinder |
| Applicable Model |
Hitachi EX370-5 Excavator |
| OEM Part Number |
9173706 |
| Product Grade |
Brand New High-Quality Aftermarket |
| Warranty |
12 months against manufacturing defects |
| MOQ |
1 unit, ample stock for immediate delivery |
| QC Standard |
ISO9001 certified, full hydraulic pressure and cyclic tests before shipment |
2. Core Technical Parameters
| # |
Part No. |
Description |
Qty |
| 0 |
9173706 |
HYDRAULIC CYLINDER; (REMAN) (SUB FOR AT250263) |
1 |
| 1 |
9173709 |
HYDRAULIC CYLINDER BARREL |
1 |
| 1A |
4358100 |
BUSHING |
2 |
| 2 |
7037769 |
ROD; (SUB FOR 7033522) |
1 |
| 2A |
4381857 |
BUSHING |
2 |
| 3 |
1022645 |
HYDRAULIC CYLINDER CAP |
1 |
| 4 |
4190127 |
CLAMP |
1 |
| 5 |
19M8630 |
SCREW; M24 X 80 |
8 |
| 6 |
AT264294 |
SEAL; (SUB FOR 4348201) |
1 |
| 7 |
AT264408 |
SEAL; (A) (SUB FOR 4171484, TH111216) |
1 |
| 8 |
4369508 |
RING |
1 |
| 9 |
AT264409 |
RING; (A) (SUB FOR 4389326) (SUB FOR 4264981) |
1 |
| 10 |
AT264399 |
BACK-UP RING; (A) (NOT ILLUSTRATED) |
1 |
| 11 |
AT264406 |
O-RING; (A) (NOT ILLUSTRATED) |
1 |
| 12 |
AT264274 |
O-RING; (A) (SUB FOR 4267138) |
1 |
| 13 |
AT264407 |
SEAL; (A) (NOT ILLUSTRATED) |
1 |
| 14 |
4264982 |
SNAP RING |
1 |
| 15 |
AT264239 |
BUSHING; (A) (SUB FOR 4284535, AT131420) |
1 |
| 16 |
AT280433 |
BACK-UP RING; (A) (NOT ILLUSTRATED) |
1 |
| 17 |
3080835 |
PISTON |
1 |
| 19 |
AT264400 |
RING; (A) (SUB FOR 4185247) |
2 |
| 20 |
AT264401 |
WEAR RING; (A) (SUB FOR 4185249, TH110063) |
2 |
| 21 |
AT264402 |
RING; (A) (SUB FOR 4185245, TH110065) |
1 |
| 22 |
4194625 |
RING |
1 |
| 23 |
3039348 |
NUT |
1 |
| 24 |
4201806 |
SET SCREW |
1 |
| 28 |
FFSB103402 |
LINE |
1 |
| 31 |
19M8444 |
SCREW; M12 X 60 |
4 |
| 33 |
AT264324 |
O-RING; (A) (SUB FOR A811035, TH100044) |
1 |
| 35 |
X4C3MXS |
ELBOW FITTING; (SUB FOR FFSB112279) |
1 |
| 36 |
T116334 |
LUBRICATION FITTING; (SUB FOR FFSB109614) |
1 |
| 38 |
FFSB102121 |
CLAMP |
1 |
| 39 |
FFSB102122 |
CLAMP |
1 |
| 43 |
19H1930 |
CAP SCREW; 12.700 X 63.500 MM (1/2" X 2-1/2") |
3 |
| 44 |
........ |
LOCK NUT |
2 |
| 45 |
19H1930 |
CAP SCREW; 12.700 X 63.500 MM (1/2" X 2-1/2") |
1 |
| 46 |
24H1111 |
WASHER; 13.487 X 26.975 X 2.286 MM (17/32" X 1-1/16" X 0.090") |
5 |
| 47 |
12H301 |
LOCK WASHER; 12.700 MM (1/2") |
3 |
| 48 |
FFSB102123 |
BRACKET |
1 |
| 49 |
FFSB102058 |
HYDRAULIC HOSE - FABRICATE |
1 |
| 50 |
X4WGTX-WLN-S |
ADAPTER FITTING; (SUB FOR FFSB102226) |
1 |
| 51 |
JD7781 |
LUBRICATION FITTING; (SUB FOR 4043330) |
1 |
| 52 |
........ |
LOCK NUT |
1 |
| 60 |
AT264430 |
SEAL KIT; (SUB FOR 9175564 AND AT181792) (INCLUDES PARTS MARKED (A)) |
1 |
| Spec Item |
Data |
| Bore Diameter |
135mm |
| Piston Rod Diameter |
92mm |
| Working Stroke |
1460mm |
| Rated Working Pressure |
31.4MPa |
| Factory Test Pressure |
47.1MPa (1.5 times the rated working pressure) |
| Barrel Material |
High-tensile seamless alloy steel with precision inner honing |
| Piston Rod |
40CrMo heat-treated steel, 28~32μm hard chrome plating, HRC68~72 for superior wear resistance and anti-deformation performance |
| Matching Seal Kit PN |
9173706K |
| Working Temperature |
-25℃ ~ +85℃ |
| Structure |
Double ear lugs with quenched copper wear bushings, built-in buffer device to reduce impact during operation |
3. Product Advantages
- Complete Original Fit & Function: Every dimension and structural detail fully matches the original factory design, enabling seamless connection with bucket linkages and hydraulic pipelines for stable and consistent operation all day long.
- Load-Bearing Reinforced Structure: The cylinder body and connecting lugs adopt optimized thickened structure, capable of resisting long-term cyclic loads and accidental knocks in complex construction environments.
- Multi-Round Pre-Delivery Inspection: Each finished cylinder undergoes continuous full-stroke reciprocating tests and high-pressure airtight checks to effectively prevent internal and external oil leakage problems.
- Cost-Effective Alternative to Genuine Parts: It delivers equivalent working performance and service life as original Hitachi components, helping spare parts vendors and maintenance teams lower overall procurement costs.
- Flexible Global Delivery Solutions: In-stock goods can be dispatched within 3 working days. Air freight is available for urgent orders, while sea freight is the most cost-effective option for large batch wholesale.
4. Supplier Brief
Our factory has dedicated itself to the R&D and production of hydraulic cylinders for Hitachi EX series excavators for over a decade. We supply a full range of boom, arm and bucket cylinders for EX370-5 and other classic Hitachi models. With sophisticated production craftsmanship and rigorous quality control systems, our products are exported to aftermarket markets in Africa, Southeast Asia and the Middle East year-round, earning solid reputation among global clients.
5. FAQ
Q1: Is this bucket cylinder compatible with EX360-5 or EX380-5 excavators?
A: No. Different Hitachi models adopt independent part numbers and structural sizes, so they are not interchangeable. Please confirm your excavator model prior to placing orders.
Q2: Does the standard package come with the matching seal repair kit?
A: The seal repair kit is not included in standard products. You can purchase the dedicated repair kit separately, and we offer a favorable price for combined orders.
Q3: What packaging is used for long-distance ocean transportation?
A: Anti-rust oil is injected inside the cylinder, and anti-rust grease is applied on the piston rod surface. The whole product is wrapped with waterproof PE film and packed in robust export plywood cases.
Q4: Can we get preferential pricing when purchasing a full set of working device cylinders?
A: Yes. Full set orders will enjoy tiered discounts. We also provide consolidated shipment service to cut down your logistics expenses.
Q5: What after-sales assistance can you provide if oil leakage occurs within the warranty period?
A: Please take clear photos of the leakage position and provide the excavator serial number. We will arrange free seal replacement and professional remote technical guidance in a timely manner.
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