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8J-5778
8J5778 is a bearing/sleeve for Caterpillar hydraulic cylinders, a hydraulic component for construction machinery. A third-party interchangeable part, H8J5778, is also available.
Part Name: Caterpillar Hydraulic Cylinder Bearing/Sleeve
OEM Part Number: 8J5778; Third-Party Interchangeable Part Number: H8J5778
Core Function: Installed inside the hydraulic cylinder, providing support, guidance, and wear protection, protecting the piston/piston rod, reducing wear on the cylinder wall, and improving cylinder life and stability.
Applicable Scenarios: Hydraulic cylinder systems of Caterpillar excavators, loaders, bulldozers, and other construction machinery.
Material and Performance: Commonly made of high-wear-resistant alloy steel, heat-treated to a hardness of HRC55-65, possessing high strength, impact resistance, and a low friction coefficient, suitable for high-pressure working conditions.
Specifications: Dimensions are consistent with original Caterpillar parts, ensuring precise installation and sealing performance.
Applicable Models:
Motor Graders
16M 18M3 16M3 16H NA 16 18 16GC 16H 16G
Track-Type Loaders
977K 977L
Wheel Dozers
950GC 972M XE 962 966XE 966M XE 938M 966G 926M 972G 966K 966 966M 950K 972K 962K 950M 972M 950 962M 972 972XE 950 GC

8J5778 is a bearing/sleeve for Caterpillar hydraulic cylinders, a hydraulic component for construction machinery. A third-party interchangeable part, H8J5778, is also available.
Part Name: Caterpillar Hydraulic Cylinder Bearing/Sleeve
OEM Part Number: 8J5778; Third-Party Interchangeable Part Number: H8J5778
Core Function: Installed inside the hydraulic cylinder, providing support, guidance, and wear protection, protecting the piston/piston rod, reducing wear on the cylinder wall, and improving cylinder life and stability.
Applicable Scenarios: Hydraulic cylinder systems of Caterpillar excavators, loaders, bulldozers, and other construction machinery.
Material and Performance: Commonly made of high-wear-resistant alloy steel, heat-treated to a hardness of HRC55-65, possessing high strength, impact resistance, and a low friction coefficient, suitable for high-pressure working conditions.
Specifications: Dimensions are consistent with original Caterpillar parts, ensuring precise installation and sealing performance.
Applicable Models:
Motor Graders
16M 18M3 16M3 16H NA 16 18 16GC 16H 16G
Track-Type Loaders
977K 977L
Wheel Dozers
950GC 972M XE 962 966XE 966M XE 938M 966G 926M 972G 966K 966 966M 950K 972K 962K 950M 972M 950 962M 972 972XE 950 GC

| Caterpillar pin and bushing | |||||
| OEM | OEM | OEM | OEM | OEM | OEM |
| 4385850 | 5346337 | 4I4811 | 2G8622 | 7K9343 | 2417381 |
| 2299247 | 5356287 | 2641702 | 2G8614 | 7K9347 | 2285615 |
| 3735700 | 5356344 | 4I4809 | 2G8735 | 9R4677 | 2417380 |
| 3792693 | 4I4618 | 4I4621 | 8D4673 | 1883064 | 2417379 |
| 3792813 | 2343803 | 1762278 | 2G8609 | 2375330 | 2357772 |
| 4368990 | 1865662 | 4I4812 | 2G8617 | 3607295 | 2285654 |
| 4385844 | 0875805 | 3150800 | 2K6413 | 3735760 | 2402914 |
| 4385846 | 2543053 | 2602390 | 5K0990 | 3792545 | 2V0707 |
| 4385847 | 2543052 | 1807752 | 6K8308 | 3792546 | 3T0996 |
| 5356345 | 2285614 | 2512537 | 2909181 | 3792689 | 1024560 |
| 5228212 | 2285617 | 4I4620 | 2357770 | 3792690 | 8X0742 |
| 5228227 | 2343811 | 1893922 | 1V7038 | 3792769 | 2370945 |
| 5228230 | 4I6718 | 1865730 | 1857220 | 4177570 | 2343749 |
| 5228232 | 4T1422 | 2343931 | 2285621 | 2402913 | 7Y9915 |
| 5228329 | 4V8519 | 1865663 | 875533 | 2357769 | 1985529 |
| 5230026 | 4V8675 | 2602385 | 875548 | 2402912 | 2487835 |
| 5230028 | 5K0984 | 1865637 | 875847 | 2444360 | 2487857 |
| 5230037 | 5K3490 | 2343930 | 990721 | 2417382 | 2291092 |
| 5233719 | 7J1335 | 8W5293 | 1066872 | 2291096 | 2291095 |
| 5233721 | 7J9682 | 2G8630 | 1164825 | 2444277 | 4V8673 |
| 7K9591 | 8K0533 | 1372817 | 2G8633 | 9V3852 | 2627044 |
| 7P3454 | 9J5875 | 2081959 | 1680480 | 2K4502 | 2785454 |
| 7Y2396 | 9R0413 | 2096181 | 9R1107 | 7K9640 | 2787695 |
| 1372819 | 9R4110 | 2285619 | 9R1104 | 1V9148 | 4I6897 |
| 7Y3427 | 9R7891 | 2291091 | 5K0987 | 1V7001 | 1461843 |
| 1372919 | 9R9475 | 2370944 | 7J1338 | 1V8241 | 9R0162 |
| 7Y3428 | 9R9505 | 2402916 | 8K5757 | 2V4876 | 9R3092 |
| 1433841 | 9T2883 | 2417280 | 9T8676 | 3J6484 | 9R5828 |
| 8E6752 | 4893010 | 2627043 | 990718 | 4K6780 | 9R0170 |
| 9R0614 | 9R0321 | 9R0147 | 9R0111 | ||
>> Partial Applicable Vehicle Model Display
| CAT | CAT301.7 CR | CAT313 GC | CAT323 GX | CAT333 |
| CAT301.4 CR | CAT312 GC | CAT323 | CAT374 | |
| CAT302 CR | CAT326 GC | CAT316 GC | CAT395 | |
| CAT303 CR | CAT326 | CAT 318D2L | CAT352 | |
| CAT305.5 | CAT320 GX | CAT330 | CAT355 | |
| CAT306.5 | CAT320 GC | CAT336 | CAT330 GC | |
| CAT307.5 | CAT320 | CAT350 | ||
| CAT307 | CAT323 GC | CAT340 | ||
| KOMATSU | PC100-3/5/6 | PC200-2/3/5/6/7/8 | PC270-6/7/8 | PC360-7 |
| PC120-2/3/5/6 | PC220-2/3/5/6/7/8 | PC290-10/11 | PC360LC-10/11 | |
| PC130-6/8/11 | PC228-1/2/3/8/10/11 | PC300LC-1/2/3/5/6/7/8 | PC390LC-10/11 | |
| PC150-1/3/5/6 | PC240-6/8/10/11 | PC350-8 | ||
| PC160-6/7/8 | PC250-6 | PC350LC-6/8/10/11 | ||
| SANY | SY135C | SY75C | SY245H-S | SY415H-S |
| SY200C-S | SY335BH-S | SY95C | SY375IDS | |
| SY205C-S | SY275H | SY485H-S | SY550H | |
| SY215E | SY235H-S | SY485GLC-S | ||
| SY215C-S | SY155H | SY305H-S | ||
| KOBELCO | SK210LC-10 | SK200-10 | SK60-8 | SK140LC-8 |
| SK130-11 | SK250-10 | SK380XD-10 | SK460-8 | |
| SK75-11 | SK260LC-10 | SK220XD-10 | ||
| SK350LC-10 | SK330-10 | SK150LC-11 | ||
| Hitachi | ZX130-6A | ZX260K-6A | ZX210LC-5A | ZX490LCH-5A |
| ZX240-5A | ZX260LCH-5A | ZX350-6A Pro | ZX220K-6A | |
| ZX250-6A | ZX200C-6A | ZX360K-5A | ZX520LCH-6A | |
| ZX250K-5A | ZH200-5A | ZX300-6A | ZX350-6A | |
| ZX250LC-5A | ZX210-6A | ZX300-5A | ZX500LCH-5A | |
| ZX260LC-6A | ZX210K-5A | ZX370K-6A | ZX220LC-6A | |
| ZX195-5A | ZX360H-5A | ZX370H-6A |
Excavator bushing
Excavator pin
Loader bushing
Loader pin
Construction machinery pins and bushings
| Caterpillar pin and bushing | |||||
| OEM | OEM | OEM | OEM | OEM | OEM |
| 4385850 | 5346337 | 4I4811 | 2G8622 | 7K9343 | 2417381 |
| 2299247 | 5356287 | 2641702 | 2G8614 | 7K9347 | 2285615 |
| 3735700 | 5356344 | 4I4809 | 2G8735 | 9R4677 | 2417380 |
| 3792693 | 4I4618 | 4I4621 | 8D4673 | 1883064 | 2417379 |
| 3792813 | 2343803 | 1762278 | 2G8609 | 2375330 | 2357772 |
| 4368990 | 1865662 | 4I4812 | 2G8617 | 3607295 | 2285654 |
| 4385844 | 0875805 | 3150800 | 2K6413 | 3735760 | 2402914 |
| 4385846 | 2543053 | 2602390 | 5K0990 | 3792545 | 2V0707 |
| 4385847 | 2543052 | 1807752 | 6K8308 | 3792546 | 3T0996 |
| 5356345 | 2285614 | 2512537 | 2909181 | 3792689 | 1024560 |
| 5228212 | 2285617 | 4I4620 | 2357770 | 3792690 | 8X0742 |
| 5228227 | 2343811 | 1893922 | 1V7038 | 3792769 | 2370945 |
| 5228230 | 4I6718 | 1865730 | 1857220 | 4177570 | 2343749 |
| 5228232 | 4T1422 | 2343931 | 2285621 | 2402913 | 7Y9915 |
| 5228329 | 4V8519 | 1865663 | 875533 | 2357769 | 1985529 |
| 5230026 | 4V8675 | 2602385 | 875548 | 2402912 | 2487835 |
| 5230028 | 5K0984 | 1865637 | 875847 | 2444360 | 2487857 |
| 5230037 | 5K3490 | 2343930 | 990721 | 2417382 | 2291092 |
| 5233719 | 7J1335 | 8W5293 | 1066872 | 2291096 | 2291095 |
| 5233721 | 7J9682 | 2G8630 | 1164825 | 2444277 | 4V8673 |
| 7K9591 | 8K0533 | 1372817 | 2G8633 | 9V3852 | 2627044 |
| 7P3454 | 9J5875 | 2081959 | 1680480 | 2K4502 | 2785454 |
| 7Y2396 | 9R0413 | 2096181 | 9R1107 | 7K9640 | 2787695 |
| 1372819 | 9R4110 | 2285619 | 9R1104 | 1V9148 | 4I6897 |
| 7Y3427 | 9R7891 | 2291091 | 5K0987 | 1V7001 | 1461843 |
| 1372919 | 9R9475 | 2370944 | 7J1338 | 1V8241 | 9R0162 |
| 7Y3428 | 9R9505 | 2402916 | 8K5757 | 2V4876 | 9R3092 |
| 1433841 | 9T2883 | 2417280 | 9T8676 | 3J6484 | 9R5828 |
| 8E6752 | 4893010 | 2627043 | 990718 | 4K6780 | 9R0170 |
| 9R0614 | 9R0321 | 9R0147 | 9R0111 | ||
>> Partial Applicable Vehicle Model Display
| CAT | CAT301.7 CR | CAT313 GC | CAT323 GX | CAT333 |
| CAT301.4 CR | CAT312 GC | CAT323 | CAT374 | |
| CAT302 CR | CAT326 GC | CAT316 GC | CAT395 | |
| CAT303 CR | CAT326 | CAT 318D2L | CAT352 | |
| CAT305.5 | CAT320 GX | CAT330 | CAT355 | |
| CAT306.5 | CAT320 GC | CAT336 | CAT330 GC | |
| CAT307.5 | CAT320 | CAT350 | ||
| CAT307 | CAT323 GC | CAT340 | ||
| KOMATSU | PC100-3/5/6 | PC200-2/3/5/6/7/8 | PC270-6/7/8 | PC360-7 |
| PC120-2/3/5/6 | PC220-2/3/5/6/7/8 | PC290-10/11 | PC360LC-10/11 | |
| PC130-6/8/11 | PC228-1/2/3/8/10/11 | PC300LC-1/2/3/5/6/7/8 | PC390LC-10/11 | |
| PC150-1/3/5/6 | PC240-6/8/10/11 | PC350-8 | ||
| PC160-6/7/8 | PC250-6 | PC350LC-6/8/10/11 | ||
| SANY | SY135C | SY75C | SY245H-S | SY415H-S |
| SY200C-S | SY335BH-S | SY95C | SY375IDS | |
| SY205C-S | SY275H | SY485H-S | SY550H | |
| SY215E | SY235H-S | SY485GLC-S | ||
| SY215C-S | SY155H | SY305H-S | ||
| KOBELCO | SK210LC-10 | SK200-10 | SK60-8 | SK140LC-8 |
| SK130-11 | SK250-10 | SK380XD-10 | SK460-8 | |
| SK75-11 | SK260LC-10 | SK220XD-10 | ||
| SK350LC-10 | SK330-10 | SK150LC-11 | ||
| Hitachi | ZX130-6A | ZX260K-6A | ZX210LC-5A | ZX490LCH-5A |
| ZX240-5A | ZX260LCH-5A | ZX350-6A Pro | ZX220K-6A | |
| ZX250-6A | ZX200C-6A | ZX360K-5A | ZX520LCH-6A | |
| ZX250K-5A | ZH200-5A | ZX300-6A | ZX350-6A | |
| ZX250LC-5A | ZX210-6A | ZX300-5A | ZX500LCH-5A | |
| ZX260LC-6A | ZX210K-5A | ZX370K-6A | ZX220LC-6A | |
| ZX195-5A | ZX360H-5A | ZX370H-6A |
Excavator bushing
Excavator pin
Loader bushing
Loader pin
Construction machinery pins and bushings
Alloy steel: such as 40Cr, etc. After heat treatment, this type of steel has high strength, hardness, and wear resistance, and can withstand large loads and frictional forces. Meanwhile, alloy steel has good toughness and is less prone to brittle fracture, making it suitable for wheel loader buckets with harsh working conditions.


Alloy steel: such as 40Cr, etc. After heat treatment, this type of steel has high strength, hardness, and wear resistance, and can withstand large loads and frictional forces. Meanwhile, alloy steel has good toughness and is less prone to brittle fracture, making it suitable for wheel loader buckets with harsh working conditions.




Q1: What is the typical application for the High Quality Excavator Bucket Cylinder Upper Pin Shaft?
A1: This pin shaft is specifically designed for excavator bucket cylinders, suitable for high-demand tasks in construction, mining, and heavy machinery operations.
Q2: Can you customize the pin shaft for other machine models?
A2: Yes, we offer full customization services for pin shafts based on your specifications, ensuring compatibility with a wide range of machinery models.
Q3: How do you ensure the durability of your excavator pin shafts?
A3: We use advanced heat treatment processes and high-quality materials to enhance the hardness and wear resistance of the pin shafts, ensuring long-lasting performance.
Q4: What materials are used for manufacturing the pin shaft?
A4: Our pin shafts are made from premium alloys such as 45C, 42CrMo4, and 41Cr4, selected for their durability and ability to withstand heavy-duty use.
Q5: Do you provide after-sales support for your excavator pin shafts?
A5: Yes, we provide comprehensive after-sales support, including product guidance, warranty services, and troubleshooting assistance to ensure continued operation.
Q6: How do I place a custom order for the pin shaft?
A6: Simply provide us with your design drawings or specifications, and we’ll create a customized pin shaft tailored to your exact requirements.
Q7: Can you ship to international locations?
A7: Yes, we can deliver our high-quality excavator pin shafts worldwide, offering efficient shipping and timely delivery to your location.
Q8: Are your pin shafts compatible with other excavator brands?
A8: Our pin shafts are designed for a wide range of excavators, including those from Sany Heavy Industry, but we can also customize them for other brands as needed.


Q1: What is the typical application for the High Quality Excavator Bucket Cylinder Upper Pin Shaft?
A1: This pin shaft is specifically designed for excavator bucket cylinders, suitable for high-demand tasks in construction, mining, and heavy machinery operations.
Q2: Can you customize the pin shaft for other machine models?
A2: Yes, we offer full customization services for pin shafts based on your specifications, ensuring compatibility with a wide range of machinery models.
Q3: How do you ensure the durability of your excavator pin shafts?
A3: We use advanced heat treatment processes and high-quality materials to enhance the hardness and wear resistance of the pin shafts, ensuring long-lasting performance.
Q4: What materials are used for manufacturing the pin shaft?
A4: Our pin shafts are made from premium alloys such as 45C, 42CrMo4, and 41Cr4, selected for their durability and ability to withstand heavy-duty use.
Q5: Do you provide after-sales support for your excavator pin shafts?
A5: Yes, we provide comprehensive after-sales support, including product guidance, warranty services, and troubleshooting assistance to ensure continued operation.
Q6: How do I place a custom order for the pin shaft?
A6: Simply provide us with your design drawings or specifications, and we’ll create a customized pin shaft tailored to your exact requirements.
Q7: Can you ship to international locations?
A7: Yes, we can deliver our high-quality excavator pin shafts worldwide, offering efficient shipping and timely delivery to your location.
Q8: Are your pin shafts compatible with other excavator brands?
A8: Our pin shafts are designed for a wide range of excavators, including those from Sany Heavy Industry, but we can also customize them for other brands as needed.





