SEM921

  • Key Specification
  • Advantage
  • Application
    • Standard (Operating Weight): 15,930 kg
    • Min. Turning Radius: 7.8 m
    • Wheelbase: 6,140 mm
    • High Productivity: Load sensing hydraulic system provides consistent and precise blade movement
    • High Reliability: A-frame designed drawbar provides strength in all blade positions
    • Comfort: World Class industry control layout with low lever efforts for reduced operator fatigue
    • Railways / Highway / Airport
    • Municipal Construction
    • Agriculture
    • Water Conservancy / Hydropower
    • Waste
    • Forestry
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SEM Tandem Axle

  • Leveraging Caterpillar designing and experience on MG tandem axle
  • Improved bearing Layout and optimized load distribution with 4 planetary gears final drive
  • Less down time and reduced labor and service cost for maintenance and repairing
  • Longer service interval for lubrication oil change
  • Leading in class manufacturing and quality control level, mandatory　 performance testing before delivering to MG assembly line

Control System

  • 7 position link bar with electric over hydraulic control allows ease of operation from within the cab
  • Optimum blade reach capability, quick DCM re-positioning for greater reach for better working on high bank side slope
  • The link bar is essential for extending reach capability when cutting a bank slope or back slope of a ditch
  • Replaceable bushings reduce service time and cost

Blade Float

  • Standard blade float function allows blade to lower without hydraulic pressure for increased versatility
  • Blade float is engaged by pushing the left and right lift cylinder controls all the way forward past the detent
  • Provides protection for machine and pavement during snow removal and snow plowing

Hydraulic System

  • Proportional Priority Pressure Compensating (PPPC) Valves contain specifically cut spools for motor grader applications, continuously matching of hydraulic flow and pressure to power demands, allowing ease of multi-function control for optimizing working efficiency
  • World-class variable displacement piston pump, efficiently reduces power consumption and hydraulic system heat, improving fuel efficiency
  • Load-sensing hydraulic system provides consistent and precise blade movement, improving finishing performance
  • Inboard lock check valves within PPPC, prevents inadvertent cylinder movement and potential leaks

Drawbar

  • A-frame tubular design drawbar provides maximum strength and durability
  • Replaceable drawbar draft ball (bolted – not welded) for less service time and cost
  • Easy removal of wear shims to adjust drawbar

Front Frame

  • Flanged box section design removes welds from high stress areas, improving reliability and durability
  • Continuous top and bottom plate construction provides consistency and strength, improving front frame durability
  • Hydraulic hose routing minimizes exposure to damage and provides quick access for service
  • Maintenance-free bushings improve durability and reduce overall service cost

Control Layout

  • Short throw levers are efficiently spaced, allowing ease of multi-function control
  • Short lever travel (40mm) with low lever effort reduces operator fatigue

Cat ® Product Link™

  • Cat ® Product Link™ will support your business, and accurately convey information of the equipment to relevant personnel in a timely and effective manner for your better equipment management.

Large Cab

  • High performance dashboard with 3 levels alarming monition system
  • Cab mounted on the front frame provides exceptional view to blade and front axle even during articulation
  • Large cab with 1.9m height and 30% larger space than most competitors, provides exceptional comfort
Model SEM921
Operating Weight
Standard 15,930 kg / 16,230 kg (With ROPS)
With Front & Rear Counterweight /
Overall Dimension L*W*H 8,854*2,630*3,360 mm
Blade Length (L*W*H) 4,279*25*607 mm
With Front Blade /
With Ripper+Front Blade /
Operating Specifications
Top Speed, Forward /
Top Speed, Reverse /
Min. Turning Radius 7,800 mm
Articulation Angle, Left /Right 20 °
Gradeability /
Wheelbase 6,140 mm
Travel Speed, Forward 40/25 km/h
Travel Speed, Reverse /
Drawbar Pull /
Engine
Engine Manufacturer SDEC SC9DK220G3
Engine Model /
Rated Power 162 kW
Max. Torque /
Emission Tier 2
Displacement /
Bore /
Stroke /
Number of Cylinders /
Transmission
Brand / Manufacturer Hangchi 6WG180
Type /
Powershift Pressure /
Forward / Reverse Gears /
Parking Brake /
Tandem Axle
Brand / Manufacturer SEM / Caterpillar
Model ST22
Differential /
Service Brake Outboard disc with brake caliper,Air to oil Control
Secondary /
Oscillation Front Up 15 °
Oscillation Front Down 25 °
Front Axle
Ground Clearance /
Wheel Lean, Left / Right ±18 °
Max. Oscillation ±16 °
Steering Range, Left / Right 47.5 °
Hydraulic System
Circuit Type Load sensing,PPPC
Pump Type /
Max. Pump Output /
Max. System Pressure /
Standby Pressure /
Moldboard
Blade Width, Standard /
Blade Width, Optional /
Moldboard Height /
Moldboard Thickness /
Throat Clearance /
Float Function /
Moldboard Sideshift, LH /
Moldboard Sideshift, RH /
Circle Centershift, LH /
Circle Centershift, RH /
Max. Blade Position Angle /
Blade Tip, Forward /
Blade Tip, Backward /
Blade Cutting Angle /
Max. Shoulder Reach outside of Tires, LH /
Max. Shoulder Reach outside of Tires, RH /
Max. Lift above Ground /
Max. Cutting Depth 715 mm
Service Refill Capacity
Fuel Tank 320 L
Engine Oil 22 L
Coolant 65 L
Transmission 28 L
Differential Case /
Tandem Case, Each Side /
Circle Drive, Non Slip Clutch 2 L
Circle Drive, With Slip Clutch 7 L
Hydraulic Oil Tank 55 L
Rear Axle (Main Reducer & Tandem) 157 L
MG Maintenance

SEM921 Machine Styling 1

SEM921 Machine Styling 2

SEM921 Machine Styling 3

SEM921 Machine Styling 4

SEM921 Machine Styling 5

SEM921 Application 1

SEM921 Application 2

SEM921 Application 3

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