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CAT 321 VS JCB JS81 Comparison
CAT 321
₹ 54 L - 55 L
VS
JCB JS81
₹ 34 L - 35 L
CAT 321
₹54L
JCB JS81
₹34L
Compare excavators helps you make an informed purchase decision.
CAT 321
From ₹ 54 Lakh
JCB JS81
From ₹ 34 Lakh
Engine
Model
Cat® C3.6
Kirloskar 4R 1040 NA
Model
Cat® C3.6
Kirloskar 4R 1040 NA
Gross Power
100 kw
57 kw
Gross Power
100 kw
57 kw
Net Power
129 kw
57 kw
Net Power
129 kw
57 kw
Engine Power
136 HP
76 HP
Engine Power
136 HP
76 HP
Engine Displacement
3600 cc
3000 cc
Engine Displacement
3600 cc
3000 cc
Number Of Cylinders
4 Nos
4 Nos
Number Of Cylinders
4 Nos
4 Nos
Rated RPM
2000 rpm
2200 rpm
Rated RPM
2000 rpm
2200 rpm
Emission Standard
BS IV
BS IV
Emission Standard
BS IV
BS IV
Max Torque
500 Nm
890 Nm
Max Torque
500 Nm
890 Nm
Fuel Type
Diesel
Diesel
Fuel Type
Diesel
Diesel
Operating Weight
Operating Weight
19300 kg
8050 kg
Operating Weight
19300 kg
8050 kg
Machine Weight
19300 kg
8050 kg
Machine Weight
19300 kg
8050 kg
Counter Weight
3650 kg
1873 kg
Counter Weight
3650 kg
1873 kg
Ground Pressure
60 kg
35 kg
Ground Pressure
60 kg
35 kg
Hydraulic System
Main Pump Type
Electro‑hydraulic main control valve system
Variable displacement axial piston type
Main Pump Type
Electro‑hydraulic main control valve system
Variable displacement axial piston type
Maximum Hydraulic Flow
315 L/min
140.6 L/min
Maximum Hydraulic Flow
315 L/min
140.6 L/min
Maximum System Pressure
350 bar
284 bar
Maximum System Pressure
350 bar
284 bar
Hydraulic Oil Capacity
218 litres
92 litres
Hydraulic Oil Capacity
218 litres
92 litres
Auxiliary Hydraulic Flow
120 L/min
80 L/min
Auxiliary Hydraulic Flow
120 L/min
80 L/min
Working Range
Max Digging Depth
5970 mm
4080 mm
Max Digging Depth
5970 mm
4080 mm
Max Vertical Wall Digging Depth
5360 mm
4211 mm
Max Vertical Wall Digging Depth
5360 mm
4211 mm
Max Reach at Ground Level
9150 mm
6454 mm
Max Reach at Ground Level
9150 mm
6454 mm
Max Dumping Height
6250 mm
5401 mm
Max Dumping Height
6250 mm
5401 mm
Max Cutting Height
9120 mm
7094 mm
Max Cutting Height
9120 mm
7094 mm
Boom Length
5.700 m
3.7 m
Boom Length
5.700 m
3.7 m
Arm Length
2250 mm
1740 mm
Arm Length
2250 mm
1740 mm
Bucket Breakout Force
135 kN
56 kN
Bucket Breakout Force
135 kN
56 kN
Arm Tear-out Force
119 kN
41 kN
Arm Tear-out Force
119 kN
41 kN
Capacities
Fuel Tank Capacity
370 litres
164 litres
Fuel Tank Capacity
370 litres
164 litres
Hydraulic Tank Capacity
218 litres
55 litres
Hydraulic Tank Capacity
218 litres
55 litres
Cooling System Capacity
25 litres
23 litres
Cooling System Capacity
25 litres
23 litres
Engine Oil Capacity
11 litres
14 litres
Engine Oil Capacity
11 litres
14 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
450 mm
Track Shoe Width
800 mm
450 mm
Track Gauge
2380 mm
1700 mm
Track Gauge
2380 mm
1700 mm
Track Length on Ground
3650 mm
2240 mm
Track Length on Ground
3650 mm
2240 mm
Ground Clearance
450 mm
365 mm
Ground Clearance
450 mm
365 mm
Tail Swing Radius
1676 mm
1840 mm
Tail Swing Radius
1676 mm
1840 mm
Undercarriage Type
Crawler — steel tracks
Welded crawler undercarriage with sealed/greased track chains and grease‑adjusted tensioning system
Undercarriage Type
Crawler — steel tracks
Welded crawler undercarriage with sealed/greased track chains and grease‑adjusted tensioning system
Steering & Brakes
Overall Length
9570 mm
6230 mm
Overall Length
9570 mm
6230 mm
Overall Width
2800 mm
2220 mm
Overall Width
2800 mm
2220 mm
Overall Height
3250 mm
2722 mm
Overall Height
3250 mm
2722 mm
Cab Height
3250 mm
2720 mm
Cab Height
3250 mm
2720 mm
Boom Height
3.300 m
3.5 m
Boom Height
3.300 m
3.5 m
Track Width
600 mm
450 mm
Track Width
600 mm
450 mm
Performances
Travel Speed
10 km/h
5.1 km/h
Travel Speed
10 km/h
5.1 km/h
Swing Speed
10 rpm
12.5 rpm
Swing Speed
10 rpm
12.5 rpm
Gradeability
27 %
60 %
Gradeability
27 %
60 %
Drawbar Pull
150 kN
55 kN
Drawbar Pull
150 kN
55 kN
Bucket And Attachments
Bucket Capacity
1 Cu.m
0.32 Cu.m
Bucket Capacity
1 Cu.m
0.32 Cu.m
Bucket Options
0.8
0.24 - 0.32
Bucket Options
0.8
0.24 - 0.32
Attachment Compatibility
Breaker, Auger, Grapple (with auxiliary hydraulics)
Standard auxiliary circuits
Attachment Compatibility
Breaker, Auger, Grapple (with auxiliary hydraulics)
Standard auxiliary circuits
Cabin And Controls
Cabin AC
Yes
No
Cabin AC
Yes
No
Display Type
8 LCD Touch Screen
LCD Monitor
Display Type
8 LCD Touch Screen
LCD Monitor
Joystick Controls
Yes
Yes
Joystick Controls
Yes
Yes
Seat Type
Suspension Seat
Suspension Seat
Seat Type
Suspension Seat
Suspension Seat
Noise Level
70 dB(A)
75 dB(A)
Noise Level
70 dB(A)
75 dB(A)
Safety Features
-
-
Safety Features
-
-
Electrical System
Battery
2X12 V
12 V
Battery
2X12 V
12 V
Alternator Output
100 A
85 A
Alternator Output
100 A
85 A
Lighting Type
LED
LED
Lighting Type
LED
LED
Additional Features
Auto Idle
Yes
Yes
Auto Idle
Yes
Yes
Eco Mode
Yes
Yes
Eco Mode
Yes
Yes
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
JCB JS81
Pros
- Capable of ~7.1 m digging height and ~6.4 m reach — good for site work, trenches, and moderate depth excavation.
- Powered by ~76 HP Kirloskar engine with robust bucket/dipper tear‑out forces, delivering decent performance vs competitors.
- JCB has extensive dealer/service coverage in India, making parts and support easier compared to some smaller brands.
