Compare Excavators. Choose Smarter.
CAT 321 VS LiuGong 921 Di Comparison
CAT 321
₹ 54 L - 55 L
VS
LiuGong 921 Di
₹ 54 L - 56 L
CAT 321
₹54L
LiuGong 921 Di
₹54L
Compare excavators helps you make an informed purchase decision.
CAT 321
From ₹ 54 Lakh
LiuGong 921 Di
From ₹ 54 Lakh
Engine
Model
Cat® C3.6
Cummins 6BT5.9‑C140
Model
Cat® C3.6
Cummins 6BT5.9‑C140
Gross Power
100 kw
170 kw
Gross Power
100 kw
170 kw
Net Power
129 kw
170 kw
Net Power
129 kw
170 kw
Engine Power
136 HP
140 HP
Engine Power
136 HP
140 HP
Engine Displacement
3600 cc
5900 cc
Engine Displacement
3600 cc
5900 cc
Number Of Cylinders
4 Nos
6 Nos
Number Of Cylinders
4 Nos
6 Nos
Rated RPM
2000 rpm
2000 rpm
Rated RPM
2000 rpm
2000 rpm
Emission Standard
BS IV
BS III
Emission Standard
BS IV
BS III
Max Torque
500 Nm
614 Nm
Max Torque
500 Nm
614 Nm
Fuel Type
Diesel
Diesel
Fuel Type
Diesel
Diesel
Operating Weight
Operating Weight
19300 kg
21000 kg
Operating Weight
19300 kg
21000 kg
Machine Weight
19300 kg
21000 kg
Machine Weight
19300 kg
21000 kg
Counter Weight
3650 kg
5341 kg
Counter Weight
3650 kg
5341 kg
Ground Pressure
60 kg
45 kg
Ground Pressure
60 kg
45 kg
Hydraulic System
Main Pump Type
Electro‑hydraulic main control valve system
Variable displacement piston pumps
Main Pump Type
Electro‑hydraulic main control valve system
Variable displacement piston pumps
Maximum Hydraulic Flow
315 L/min
210 L/min
Maximum Hydraulic Flow
315 L/min
210 L/min
Maximum System Pressure
350 bar
343 bar
Maximum System Pressure
350 bar
343 bar
Hydraulic Oil Capacity
218 litres
330 litres
Hydraulic Oil Capacity
218 litres
330 litres
Auxiliary Hydraulic Flow
120 L/min
230 L/min
Auxiliary Hydraulic Flow
120 L/min
230 L/min
Working Range
Max Digging Depth
5970 mm
5875 mm
Max Digging Depth
5970 mm
5875 mm
Max Vertical Wall Digging Depth
5360 mm
4578 mm
Max Vertical Wall Digging Depth
5360 mm
4578 mm
Max Reach at Ground Level
9150 mm
9256 mm
Max Reach at Ground Level
9150 mm
9256 mm
Max Dumping Height
6250 mm
6798 mm
Max Dumping Height
6250 mm
6798 mm
Max Cutting Height
9120 mm
5661 mm
Max Cutting Height
9120 mm
5661 mm
Boom Length
5.700 m
5.412 m
Boom Length
5.700 m
5.412 m
Arm Length
2250 mm
2800 mm
Arm Length
2250 mm
2800 mm
Bucket Breakout Force
135 kN
159 kN
Bucket Breakout Force
135 kN
159 kN
Arm Tear-out Force
119 kN
113 kN
Arm Tear-out Force
119 kN
113 kN
Capacities
Fuel Tank Capacity
370 litres
412 litres
Fuel Tank Capacity
370 litres
412 litres
Hydraulic Tank Capacity
218 litres
230 litres
Hydraulic Tank Capacity
218 litres
230 litres
Cooling System Capacity
25 litres
30 litres
Cooling System Capacity
25 litres
30 litres
Engine Oil Capacity
11 litres
25 litres
Engine Oil Capacity
11 litres
25 litres
Swing Drive Oil Capacity
6 litres
7 litres
Swing Drive Oil Capacity
6 litres
7 litres
Final Drive Gear Oil Capacity
6 litres
5 litres
Final Drive Gear Oil Capacity
6 litres
5 litres
Under Carriage
Track Shoe Width
800 mm
600 mm
Track Shoe Width
800 mm
600 mm
Track Gauge
2380 mm
2200 mm
Track Gauge
2380 mm
2200 mm
Track Length on Ground
3650 mm
4170 mm
Track Length on Ground
3650 mm
4170 mm
Ground Clearance
450 mm
440 mm
Ground Clearance
450 mm
440 mm
Tail Swing Radius
1676 mm
2860 mm
Tail Swing Radius
1676 mm
2860 mm
Undercarriage Type
Crawler — steel tracks
Tracked/Crawler undercarriage
Undercarriage Type
Crawler — steel tracks
Tracked/Crawler undercarriage
Steering & Brakes
Overall Length
9570 mm
9712 mm
Overall Length
9570 mm
9712 mm
Overall Width
2800 mm
2800 mm
Overall Width
2800 mm
2800 mm
Overall Height
3250 mm
3050 mm
Overall Height
3250 mm
3050 mm
Cab Height
3250 mm
5431 mm
Cab Height
3250 mm
5431 mm
Boom Height
3.300 m
3.500 m
Boom Height
3.300 m
3.500 m
Track Width
600 mm
600 mm
Track Width
600 mm
600 mm
Performances
Travel Speed
10 km/h
5.3 km/h
Travel Speed
10 km/h
5.3 km/h
Swing Speed
10 rpm
12 rpm
Swing Speed
10 rpm
12 rpm
Gradeability
27 %
70 %
Gradeability
27 %
70 %
Drawbar Pull
150 kN
210 kN
Drawbar Pull
150 kN
210 kN
Bucket And Attachments
Bucket Capacity
1 Cu.m
0.95 Cu.m
Bucket Capacity
1 Cu.m
0.95 Cu.m
Bucket Options
0.8
0.85 - 0.95
Bucket Options
0.8
0.85 - 0.95
Attachment Compatibility
Breaker, Auger, Grapple (with auxiliary hydraulics)
Breaker/grapple/powertilt
Attachment Compatibility
Breaker, Auger, Grapple (with auxiliary hydraulics)
Breaker/grapple/powertilt
Cabin And Controls
Cabin AC
Yes
Yes
Cabin AC
Yes
Yes
Display Type
8 LCD Touch Screen
Digital/analog combo (basic)
Display Type
8 LCD Touch Screen
Digital/analog combo (basic)
Joystick Controls
Yes
Yes
Joystick Controls
Yes
Yes
Seat Type
Suspension Seat
Operator seat with suspension
Seat Type
Suspension Seat
Operator seat with suspension
Noise Level
70 dB(A)
76 dB(A)
Noise Level
70 dB(A)
76 dB(A)
Safety Features
-
-
Safety Features
-
-
Electrical System
Battery
2X12 V
24 V
Battery
2X12 V
24 V
Alternator Output
100 A
80 A
Alternator Output
100 A
80 A
Lighting Type
LED
LED
Lighting Type
LED
LED
Additional Features
Auto Idle
Yes
Yes
Auto Idle
Yes
Yes
Eco Mode
Yes
No
Eco Mode
Yes
No
Telematics
No
Yes
Telematics
No
Yes
Diagnostic System
Yes
Yes
Diagnostic System
Yes
Yes
CAT 321
Pros
- 136 HP Cat C3.6 engine delivers strong digging performance.
- An advanced electrohydraulic system improves cycle time.
- Eco Mode and Intelligent ECM help reduce fuel consumption
LiuGong 921 Di
Pros
- Offers respectable digging depth (~5.9 m) and horizontal reach (~9.2 m), making it suitable for medium‑sized construction and earthmoving tasks like trenching, foundation work, and site prep.
- The boom and reach balance enables both digging and loading without needing heavy long‑reach modifications.
- Compared with heavier or lighter models, the 921Di’s boom reach fits well in the 20‑22 t excavator segment
