KOMATSU PC135F PC150-1 Excavator Final Drive Travel Motor Original Nabtesco GM21VA-A 21K-60-00020 Spare Part

Name: KOMATSU PC135F PC150-1 Excavator Final Drive Travel Motor Original Nabtesco GM21VA-A 21K-60-00020 Spare Part
Brand: BELPARTS MACHINERY LIMITED

Price Negotiable

Price: Negotiation

MOQ: 1 PCS

Delivery Time: 3-7 Day

Brand: Belparts

Product Description

Original Nabtesco GM21VA‑A Integrated Final Drive Travel Motor Assembly with Gearbox 21K‑60‑00020 for Komatsu PC135F PC150‑1 Excavator

1. OEM Part Number & Machine Compatibility

Original travel motor model: Nabtesco GM21VA‑A two‑speed integrated final drive (hydraulic travel motor + 2‑stage planetary reduction gearbox)
Komatsu OEM interchange part number: 21K‑60‑00020
Fully compatible excavator models: Komatsu PC135F, PC150‑1
This OEM part number is the factory original assembly code; unified mounting flange bolt pattern, sprocket hub interface, hydraulic A/B feed & drain port layout and internal hydraulic calibration. Genuine original unit supports direct bolt‑on replacement without modification to track frame or hydraulic pipelines.

2. Core Technical Specifications

Structure type: Two‑speed variable displacement hydraulic travel motor (Stage 1: Low Speed High Torque / Stage 2: High‑Speed Travel) + two‑stage planetary reduction gear reducer
Dual motor displacement: 44 / 79 cm³/rev
Total gear reduction ratio: 54

Second‑Stage High‑Speed Working Parameters

Rated working pressure: 32.0 MPa
Maximum relief pressure: 34.8 MPa
Rated operating speed: 2 450 rpm
Rated input power: 43.5 kW
Max output climbing torque: 20 600 N·m
Dual travel speed range: 28‑52 rpm, perfectly matched to factory hydraulic system for 13‑15 ton Komatsu PC135F / PC150‑1 excavator platform
Mounting PCD, sprocket fit dimension and oil port layout strictly follow Komatsu OEM drawing specifications
Motor and gearbox housing made of high‑strength ductile iron; internal pistons, valve plate, planetary gears, carrier and heavy‑duty bearings adopt quenched wear‑resistant alloy steel for general construction and rough‑site operations.

3. Internal Structure & Functional Introduction

Dual‑displacement travel motor offers two working modes: low‑speed high‑torque mode for slope climbing, muddy terrain and heavy digging; high‑speed mode for fast flat‑ground machine relocation.
Built‑in multi‑disc spring‑applied hydraulic‑release mechanical parking brake, prevents track sliding on inclined ground when travel control is released.
Two‑stage compact planetary gear set amplifies hydraulic torque to drive track sprocket, delivering stable continuous power output under heavy‑load conditions.
Integrated anti‑cavitation valve and built‑in shock relief valve absorb hydraulic pressure spikes during compound movements, protecting internal core components from impact damage.
Compact integrated layout matches the undercarriage installation space of Komatsu PC135F and PC150‑1 excavators.

4. Product Advantages

Genuine original Nabtesco complete assembly, 1:1 OEM dimension, plug‑and‑play installation without cutting or reworking hoses, track frame or mounting brackets.
Every original final drive passes full factory hydraulic bench test before shipment: two‑speed shift test, pressure stability test, internal leakage test and brake holding torque verification.
Full overhaul spare parts are available: floating seal, piston shoe assemblies, swash plate, valve plate, planetary gear sets, carrier, bearings and full seal repair kits for component‑level maintenance.
Factory OEM number 21K‑60‑00020 dedicated for PC135F / PC150‑1, simplify order processing, stock classification and inventory management for dealers and repair workshops.
Standard 12‑month full warranty for original unit, performance consistent with factory‑fitted travel motor assembly.

5. Packaging & Global Delivery Details

Oil ports and output spline shaft coated with anti‑rust grease and fitted with dust‑proof protective plugs.
Complete final drive wrapped with moisture‑proof plastic film and secured in export‑grade solid wooden crate to avoid collision and damp corrosion during sea or air long‑haul transit.
In‑stock original units can be dispatched within 3‑5 working days after order confirmation.
Multiple shipping options available: international air express, sea LCL bulk shipment, overland truck transport for global construction machinery markets.

6. FAQ

Q: Is 21K‑60‑00020 the full assembly part number for GM21VA‑A?

A: Yes, 21K‑60‑00020 is Komatsu’s OEM part number corresponding to Nabtesco GM21VA‑A complete final drive assembly for PC135F and PC150‑1.
Q: Does this original travel motor fit directly on Komatsu PC135F and PC150‑1?

A: Yes, unified OEM mounting dimensions and factory‑calibrated hydraulic parameters support direct bolt‑on installation without extra adjustment or modification.
Q: What is the relation between GM21VA‑A and 21K‑60‑00020?

A: GM21VA‑A is Nabtesco original travel motor model code; 21K‑60‑00020 is Komatsu‑assigned OEM part number for this full final‑drive assembly.
Q: Are separate overhaul spare parts available for GM21VA‑A final drive?

A: Matching full seal kits, piston shoe assemblies, valve plates, swash plates, planetary gear carriers and floating seal spare parts are available for partial overhaul and single‑component replacement work.