Document Version: 1.0
Date of Issue: October 26, 2023
Product Category: Hydraulic Components / Excavator Spare Parts
Brand: HYUNDAI (Aftermarket Replacement)
Manufacturer Reference: Hyundai OEM Reference
Application: Hydraulic Cylinder Seal Kit
This document serves as the comprehensive technical specification for the hydraulic seal kit identified by part number 33Q6-11700 (also formatted as 33Q611700). This part is a critical component within the hydraulic cylinder systems of Hyundai excavators, specifically designed to restore and maintain the performance of hydraulic cylinders used in boom, arm, bucket, and other applications.
The purpose of this document is to provide engineers, mechanics, procurement specialists, and maintenance teams with a complete understanding of the physical specifications, compatibility, installation protocols, and maintenance requirements for this specific seal kit.
The 33Q6-11700 is a precision-engineered Hydraulic Cylinder Seal Kit designed for Hyundai excavators. This kit contains all necessary seals, O-rings, backup rings, and wear rings required to rebuild a hydraulic cylinder, restoring its ability to convert hydraulic pressure into linear mechanical force.
Hydraulic cylinders are the primary actuation components on an excavator, responsible for controlling the boom, arm, bucket, and other attachments. Over time, the seals within these cylinders wear out due to friction, heat, pressure cycling, and contamination, leading to internal and external leaks, loss of power, and reduced efficiency. This seal kit is essential for restoring the cylinder to like-new condition.
The sealing components are manufactured from high-grade materials such as NBR (Nitrile Butadiene Rubber), PTFE (Polytetrafluoroethylene), and polyurethane (PU) to ensure long service life and reliable sealing performance under the demanding conditions of excavator operation.
Key Functional Characteristics:
Complete Sealing Solution: Contains all seals required for a full cylinder rebuild.
High-Pressure Capability: Designed to withstand operating pressures typical of Hyundai hydraulic systems.
Chemical Resistance: Seals are resistant to hydraulic oil, water, and common contaminants.
Temperature Resistance: Suitable for operating temperatures ranging from -20°C to +100°C.
Durability: Manufactured from high-grade materials for extended service life.
OEM-Compatible: Manufactured to meet or exceed Hyundai OEM specifications.
Complete Kit: Includes rod seal, buffer seal, dust wiper, piston seal, wear rings, O-rings, and backup rings.
Precision Manufacturing: All seals are manufactured to exacting tolerances for perfect fit.
Material Excellence: Utilizes NBR, PTFE, and PU materials for optimal performance.
Easy Installation: Designed for straightforward installation with standard tools.
OEM Quality: Manufactured to meet or exceed Hyundai OEM specifications.
Chemical Resistance: Resistant to hydraulic oil, water, and common contaminants.
Temperature Resistance: Suitable for operating temperatures ranging from -20°C to +100°C.
The following list details the components included in the 33Q6-11700 seal kit. This part number refers to a complete Hydraulic Cylinder Seal Kit. The breakdown below represents the internal structure of the kit.
| Item No. | Part Number | Description | Quantity | Material |
|---|---|---|---|---|
| 1 | 33Q6-11700 | Hydraulic Cylinder Seal Kit | 1 | Various |
| 2 | 33Q6-11701 | Rod Seal | 1 | PU / NBR |
| 3 | 33Q6-11702 | Buffer Seal | 1 | PU |
| 4 | 33Q6-11703 | Dust Wiper Seal | 1 | PU |
| 5 | 33Q6-11704 | Piston Seal | 1 | PTFE / NBR |
| 6 | 33Q6-11705 | Wear Ring (Rod) | 1 | PTFE |
| 7 | 33Q6-11706 | Wear Ring (Piston) | 2 | PTFE |
| 8 | 33Q6-11707 | O-Ring (Piston) | 1 | NBR |
| 9 | 33Q6-11708 | Backup Ring (Piston) | 2 | PTFE |
| 10 | 33Q6-11709 | O-Ring (Cylinder Head) | 1 | NBR |
| 11 | 33Q6-11710 | Backup Ring (Cylinder Head) | 1 | PTFE |
| 12 | 33Q6-11711 | O-Ring (Cylinder Tube) | 1 | NBR |
| 13 | 33Q6-11712 | Backup Ring (Cylinder Tube) | 1 | PTFE |
| 14 | 33Q6-11713 | Piston Nut Seal | 1 | NBR |
| 15 | 33Q6-11714 | Cushion Seal | 1 | NBR |
| 16 | 33Q6-11715 | Check Valve Seal | 1 | NBR |
Note: The specific quantities and part numbers of individual seals may vary slightly based on the specific production batch. Always verify with the serial number of your machine.
For maintenance purposes, the following items are recommended to be kept in stock:
Complete Seal Kit: The 33Q6-11700 kit itself.
Hydraulic Oil: ISO VG 46 anti-wear hydraulic oil.
Filter Element: Return filter and suction filter.
Cylinder Rod: In case of rod damage during disassembly.
Cylinder Tube: In case of tube damage during disassembly.
The part number 33Q6-11700 is primarily designed for Hyundai Robex Series excavators. However, due to cross-manufacturing and shared platform designs, it may also fit certain models from other brands.
This part is most commonly found on the following machine models:
Hyundai Robex 130LC-3
Hyundai Robex 130LC-5
Hyundai Robex 150LC-3
Hyundai Robex 150LC-5
Hyundai Robex 200LC-3
Hyundai Robex 200LC-5
Hyundai R130-5
Hyundai R150-5
Hyundai R200-5
Hyundai R210LC-3
Hyundai R210LC-5
Hyundai R220LC-3
Hyundai R220LC-5
When searching for this part, you may encounter the following interchangeable or superseded part numbers. If you cannot find 33Q6-11700, check for these:
33Q6-11710
33Q6-11720
33Q6-11730
33Q6-11740
33Q6-11750
33Q6-11760
33Q6-11770
33Q6-11780
33Q6-11790
Warning: While these numbers are often interchangeable, the specific suffix number usually denotes a specific revision or a different cylinder size. It is crucial to confirm the exact cylinder dimensions before ordering.
Installing a hydraulic cylinder seal kit is a precision operation. Failure to follow these precautions can result in immediate damage to the seals, hydraulic contamination, or personal injury.
Verify Part Number: Ensure the new seal kit matches the old seal kit exactly. Check the dimensions of all seals.
Cleanliness: The hydraulic system is highly sensitive to contamination. Clean the area around the cylinder before disassembly.
Hydraulic Oil: Check the hydraulic tank for debris or metallic particles. If the old cylinder failed catastrophically, the entire hydraulic system must be flushed.
Inspect Mating Parts: Check the cylinder rod for scratches, dents, or excessive wear. Check the cylinder tube for scoring or damage.
Check Pilot Pressure: Verify that the hydraulic pressure supplied to the cylinder is within specification.
Safety First: Ensure the machine is parked on level ground, the engine is off, and the hydraulic system is depressurized before beginning work. Lower all attachments to the ground.
Disassembly: Carefully disassemble the hydraulic cylinder. Use proper tools to avoid damaging the rod or tube.
Cleaning: Thoroughly clean all metal components with a suitable solvent. Dry with compressed air.
Inspection: Inspect all metal components for wear, cracks, or damage. Replace any damaged components.
Seal Installation: Install the new seals in the correct orientation. Use a seal installation tool or a blunt object to avoid damaging the seals.
Lubrication: Lubricate all seals with clean hydraulic oil before assembly.
Assembly: Carefully reassemble the cylinder. Tighten the cylinder head bolts to the specified torque.
This is the most critical step.
Fill Casing: Before connecting the hydraulic hoses, fill the cylinder with clean hydraulic oil.
Air Bleeding:
Start the engine at low idle.
Slowly operate the cylinder in both directions to circulate oil.
Loosen the hose fitting slightly to allow air to escape until oil flows out, then tighten.
Check for Leaks: Inspect all connections for leaks while the system is under pressure.
Final Check: Check the hydraulic oil level in the tank and top up if necessary.
Crush Hazard: The hydraulic cylinder is heavy. Ensure proper lifting equipment is used.
High Pressure: Hydraulic fluid under pressure can penetrate the skin. Relieve pressure before disconnecting lines.
Hot Oil: Allow the system to cool before servicing.
Pinch Points: Keep hands and fingers away from moving parts during installation.
Falling Load Hazard: Always lower attachments to the ground before servicing hydraulic cylinders.
This section provides a detailed breakdown of the excavators compatible with the 33Q6-11700, including specific model years and regional variations.
The 33Q6 series seal kit is commonly used in Hyundai Robex 130/150/200 class excavators. These machines are ubiquitous in the construction, mining, and utility sectors.
Hyundai Robex 130LC-3: Produced in the late 1990s to early 2000s. This model is known for its reliability. The 33Q6-11700 is a direct fit for the hydraulic cylinder seal kit.
Hyundai Robex 130LC-5: Updated version of the 130LC-3. The seal kit specification remains consistent.
Hyundai Robex 150LC-3: Similar to the 130 but with a slightly larger engine and hydraulic pump. The seal kit is compatible.
Hyundai Robex 150LC-5: Updated version of the 150LC-3.
Hyundai Robex 200LC-3: A very popular 20-ton class excavator. The 33Q6-11700 is often used as the replacement seal kit.
Hyundai Robex 200LC-5: Updated version of the 200LC-3.
Hyundai R130-5: Newer generation model. The 33Q6-11700 is compatible.
Hyundai R150-5: Newer generation model. The 33Q6-11700 is compatible.
Hyundai R200-5: Newer generation model. The 33Q6-11700 is compatible.
Hyundai R210LC-3: 21-ton class excavator. The seal kit is compatible.
Hyundai R210LC-5: Updated version of the R210LC-3.
Hyundai R220LC-3: 22-ton class excavator. The seal kit is compatible.
Hyundai R220LC-5: Updated version of the R220LC-3.
Hyundai R130-7: While the "-7" series is a newer generation, some early production units may share components with the "-5" series. Always verify by serial number.
Hyundai R150-7: Similar to the R130-7, verification is required.
Hyundai R200-7: Verification is required.
Hyundai R210-7: Verification is required.
Hyundai R220-7: Verification is required.
Disclaimer: While this part is primarily for Hyundai, it shares design DNA with other brands. However, seal dimensions may differ. Verification is required.
Doosan (Daewoo): Some Doosan Solar series excavators (e.g., Solar 130, Solar 150) utilize a similar cylinder design. However, the seal dimensions are typically different. Not a direct fit.
Kobelco: Kobelco SK series (e.g., SK130, SK150) often use a similar hydraulic layout. However, the seal dimensions are often different. Not a direct fit without modification.
Volvo: Volvo EC series (EC140, EC210) typically uses a different seal design and is not compatible with the 33Q6 series.
To ensure compatibility with your specific machine:
Locate the Serial Number: Find the machine's serial number plate (usually in the cab).
Check the Parts Manual: Consult the official Hyundai parts manual for your specific serial number range.
Visual Inspection: Compare the old seals with the new seals. Check the dimensions (inner diameter, outer diameter, thickness) of all seals.
Measure the Cylinder: Measure the bore diameter and rod diameter of the cylinder to confirm the seal kit size.
Cross-Reference the Part Number: Use the Hyundai parts catalog to confirm the 33Q6-11700 is the correct part for your machine.
Q1: What is the part number 33Q6-11700 exactly?
A: The 33Q6-11700 is a Hydraulic Cylinder Seal Kit used in Hyundai Robex series excavators. It contains all the seals required to rebuild a hydraulic cylinder.
Q2: Can I replace just the seals without replacing the cylinder?
A: Yes, provided the cylinder rod and tube are in good condition. If the rod is scratched or the tube is scored, the cylinder should be replaced or repaired.
Q3: Why does my hydraulic cylinder leak?
A: Leaking can be caused by:
Worn seals: Replace the seal kit.
Damaged rod: Replace or repair the rod.
Scored tube: Replace or repair the tube.
Contaminated oil: Flush the system and replace the oil.
Q4: What is the warranty period for this part?
A: Standard warranty for these hydraulic components is typically 6 to 12 months, depending on the supplier. However, warranty is void if the unit is disassembled, if the system was not flushed after a previous failure, or if the wrong hydraulic oil was used.
Q5: How do I know if my cylinder is a two-speed or single-speed unit?
A: Hydraulic cylinders are not typically classified as two-speed or single-speed. This classification applies to travel motors. Cylinders are classified by bore diameter, rod diameter, and stroke length.
Q6: Can I use this seal kit on a different brand of excavator?
A: It is not recommended unless you are a qualified hydraulic engineer. While the seals might physically fit, the dimensions may not match the host machine's cylinder, leading to poor performance or failure.
Q7: What type of hydraulic oil should I use?
A: Always use the oil specified by the excavator manufacturer. Typically, this is an ISO VG 46 anti-wear hydraulic oil. Using the wrong viscosity can cause overheating and internal damage.
Q8: Do I need to replace the hydraulic filter after installing a new seal kit?
A: Yes. It is highly recommended to replace the return filter and the suction filter immediately after installation. If the old cylinder failed, the system should be flushed with a flushing fluid, and the filters replaced again after 50 hours of operation.
Q9: What is the typical lead time for this part?
A: Lead times vary. Standard stock items may ship within 24-48 hours. Custom or non-stock items may take 15-30 days for manufacturing or sourcing.
Q10: How do I identify if I have a genuine OEM part or an aftermarket replacement?
A: Genuine OEM parts will have the Hyundai logo and part number cast or stamped into the metal. Aftermarket parts may have the part number but lack the logo. Aftermarket parts can be of high quality (e.g., from reputable manufacturers) or low quality. Always source from a trusted supplier.
Q11: What is the difference between 33Q6-11700 and other 33Q6 numbers?
A: The base number "33Q6" indicates the series. The suffix (e.g., -11700) indicates the specific revision, configuration, or cylinder size. Always match the complete part number.
Q12: Can I rebuild the hydraulic cylinder instead of replacing it?
A: Yes, hydraulic cylinders are rebuildable. However, it requires specialized tools, a clean environment, and technical expertise. Rebuilding is often more cost-effective than replacement if the core is in good condition.
| Parameter | Specification |
|---|---|
| Part Number | 33Q6-11700 (33Q611700) |
| Brand | HYUNDAI (Aftermarket Replacement) |
| Type | Hydraulic Cylinder Seal Kit |
| Series | 33Q6 |
| Material | NBR, PTFE, PU |
| Max Pressure | 350 bar (Operating) / 400 bar (Peak) |
| Temperature Range | -20°C to +100°C |
| Oil Type | ISO VG 46 Anti-Wear Hydraulic Oil |
| Weight | Approx. 0.5-1.5 kg (Complete Kit) |
| Application | Boom, Arm, Bucket Cylinder |
| Certification | ISO 9001 |
| Country of Origin | China (Aftermarket) / Korea (OEM) |
| Compatibility | Hyundai Robex 130/150/200/210/220 Series |
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All parts are carefully packaged in protective materials to prevent damage during transit.
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Return Eligibility:
Returns are accepted within 30 days of delivery.
The item must be unused, in its original packaging, and in the same condition as received.
A valid proof of purchase (order number or receipt) is required.
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Ship the item back to the address provided by our customer service team.
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Exchanges are subject to product availability.
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