33-99No. Mufu E Rd. Gulou District, Nanjing, China [email protected] | [email protected]
33-99No. Mufu E Rd. Gulou District, Nanjing, China [email protected] | [email protected]
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Product Overview
This high-performance overhaul seal kit is professionally engineered for Nabtesco GM21 integrated travel hydraulic motors (final drive motors) widely equipped on crawler excavators. It matches mainstream GM21 model variants including GM21VA-A-43/76-2 and GM21VA-A-44/79-1, and covers full-spec configurations of this two-speed travel motor series.
The kit integrates a complete set of sealing components for motor body, floating seal assembly, parking brake and oil passage ports, fully supporting full disassembly, overhaul and routine maintenance of Nabtesco GM21 travel motors.
Adopting imported premium NBR nitrile rubber and FKM fluororubber (Viton) as core sealing materials, paired with reinforced PTFE backup rings, this seal kit delivers excellent oil resistance, high-pressure resistance, wear resistance and anti-aging performance. It serves as a perfect direct OEM replacement for original Nabtesco sealing parts. The kit effectively solves typical failures such as external oil leakage, internal leakage, pressure loss and brake oil leakage, and greatly extends the service life of GM21 travel motors under long-term heavy-load, vibration and outdoor harsh working conditions.
Product Specifications
Item |
Detailed Parameter |
Product Name |
Nabtesco GM21 Hydraulic Travel Motor Seal Kit |
Applicable Model |
Nabtesco GM21 Two-speed Travel Motor (Main variants: GM21VA-A-43/76-2, GM21VA-A-44/79-1) |
Compatible Series |
Nabtesco GM Series Integrated Final Drive & Travel Hydraulic Motor |
Main Material |
Imported NBR / FKM (Viton) Fluororubber + Reinforced PTFE Backup Ring + Triple Lip Seals |
Max Working Pressure |
38MPa (380bar) |
Working Temperature |
-25°C ~ 115°C |
Kit Contents |
Shaft seals, floating seals, O-rings, gaskets, backup rings, brake piston seals, port seals and all full-overhaul sealing accessories |
Cross Reference OEM No. |
(To be filled with actual OEM numbers) |
Net Weight |
Approximately 1.0kg |
Applicable System |
Excavator crawler drive system, integrated hydraulic travel & reduction gear system, built-in parking brake system |
Warranty |
12 Months |
Recommended Hydraulic Oil |
ISO VG32 ~ VG46 anti-wear hydraulic oil (per Nabtesco original standard) |
Key Selling Points
1. 100% Exact OEM Direct Replacement.Fully compatible with original Nabtesco GM21 travel motors and precisely matched to standard OEM dimensions and part numbers. No cutting, grinding or modification is required. It enables fast on-site installation for daily maintenance, equipment troubleshooting and emergency repair, and perfectly restores the original sealing performance of the motor.
2. Premium Imported Sealing Materials.Core sealing components adopt high-temperature resistant FKM fluororubber and triple lip structure design, cooperating with wear-resistant floating seals. The materials resist hydraulic oil corrosion, fatigue and low-temperature embrittlement, and maintain stable sealing performance continuously within the full working temperature range of -25°C to 115°C.
3. Superior High Pressure & Vibration Resistance.All sealing parts have passed strict 38MPa high-pressure endurance and mechanical vibration simulation tests. It thoroughly suppresses internal and external leakage of the motor and parking brake, stabilizes hydraulic system pressure, and ensures stable output of driving torque and power for excavator crawlers under continuous vibration, impact and heavy-duty operating scenarios.
4. Complete All-in-One Overhaul Kit.Equipped with all required sealing parts for full motor maintenance, including dedicated seals for integrated parking brake and reduction gear oil ports. The integrated package unifies all accessories, simplifies parts management, shortens overall repair downtime and effectively reduces the operation and maintenance cost of construction machinery.
5. Rigorous Factory Quality Control.Every finished seal kit undergoes air tightness test, high-pressure leakage test and aging test before delivery. All products comply with Nabtesco original factory technical standards, providing long-term reliable operation for engineering equipment.
6. Wide Application Scope.Specially designed for Nabtesco GM21 travel motors installed on various crawler engineering machinery, mainly applied to:
Welcome to HOVOO, a Chinese seal factory. Production of PU, Rubber and PTFE seals. The seals include O-ring, piston seal, rod seal, Gray ring and gas seal.
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