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CAT 321 VS JCB 55Z Comparison
CAT 321
₹ 54 L - 55 L
VS
JCB 55Z
₹ 36 L - 39 L
CAT 321
₹54L
JCB 55Z
₹36L
Compare excavators helps you make an informed purchase decision.
CAT 321
From ₹ 54 Lakh
JCB 55Z
From ₹ 36 Lakh
Engine
Model
Cat® C3.6
Stage 3A 404D‑22
Model
Cat® C3.6
Stage 3A 404D‑22
Gross Power
100 kw
35.7 kw
Gross Power
100 kw
35.7 kw
Net Power
129 kw
33.1 kw
Net Power
129 kw
33.1 kw
Engine Power
136 HP
48 HP
Engine Power
136 HP
48 HP
Engine Displacement
3600 cc
2179 cc
Engine Displacement
3600 cc
2179 cc
Number Of Cylinders
4 Nos
4 Nos
Number Of Cylinders
4 Nos
4 Nos
Rated RPM
2000 rpm
2600 rpm
Rated RPM
2000 rpm
2600 rpm
Emission Standard
BS IV
BS III
Emission Standard
BS IV
BS III
Max Torque
500 Nm
143 Nm
Max Torque
500 Nm
143 Nm
Fuel Type
Diesel
Diesel
Fuel Type
Diesel
Diesel
Operating Weight
Operating Weight
19300 kg
5520 kg
Operating Weight
19300 kg
5520 kg
Machine Weight
19300 kg
5520 kg
Machine Weight
19300 kg
5520 kg
Counter Weight
3650 kg
982 kg
Counter Weight
3650 kg
982 kg
Ground Pressure
60 kg
34.3 kg
Ground Pressure
60 kg
34.3 kg
Hydraulic System
Main Pump Type
Electro‑hydraulic main control valve system
Piston pump
Main Pump Type
Electro‑hydraulic main control valve system
Piston pump
Maximum Hydraulic Flow
315 L/min
126 L/min
Maximum Hydraulic Flow
315 L/min
126 L/min
Maximum System Pressure
350 bar
240 bar
Maximum System Pressure
350 bar
240 bar
Hydraulic Oil Capacity
218 litres
100 litres
Hydraulic Oil Capacity
218 litres
100 litres
Auxiliary Hydraulic Flow
120 L/min
63 L/min
Auxiliary Hydraulic Flow
120 L/min
63 L/min
Working Range
Max Digging Depth
5970 mm
3840 mm
Max Digging Depth
5970 mm
3840 mm
Max Vertical Wall Digging Depth
5360 mm
3328 mm
Max Vertical Wall Digging Depth
5360 mm
3328 mm
Max Reach at Ground Level
9150 mm
6200 mm
Max Reach at Ground Level
9150 mm
6200 mm
Max Dumping Height
6250 mm
4270 mm
Max Dumping Height
6250 mm
4270 mm
Max Cutting Height
9120 mm
3728 mm
Max Cutting Height
9120 mm
3728 mm
Boom Length
5.700 m
2.866 m
Boom Length
5.700 m
2.866 m
Arm Length
2250 mm
1450 mm
Arm Length
2250 mm
1450 mm
Bucket Breakout Force
135 kN
45 kN
Bucket Breakout Force
135 kN
45 kN
Arm Tear-out Force
119 kN
29 kN
Arm Tear-out Force
119 kN
29 kN
Capacities
Fuel Tank Capacity
370 litres
76 litres
Fuel Tank Capacity
370 litres
76 litres
Hydraulic Tank Capacity
218 litres
55 litres
Hydraulic Tank Capacity
218 litres
55 litres
Cooling System Capacity
25 litres
12 litres
Cooling System Capacity
25 litres
12 litres
Engine Oil Capacity
11 litres
9.1 litres
Engine Oil Capacity
11 litres
9.1 litres
Swing Drive Oil Capacity
6 litres
8 litres
Swing Drive Oil Capacity
6 litres
8 litres
Final Drive Gear Oil Capacity
6 litres
12 litres
Final Drive Gear Oil Capacity
6 litres
12 litres
Under Carriage
Track Shoe Width
800 mm
400 mm
Track Shoe Width
800 mm
400 mm
Track Gauge
2380 mm
1550 mm
Track Gauge
2380 mm
1550 mm
Track Length on Ground
3650 mm
1950 mm
Track Length on Ground
3650 mm
1950 mm
Ground Clearance
450 mm
300 mm
Ground Clearance
450 mm
300 mm
Tail Swing Radius
1676 mm
975 mm
Tail Swing Radius
1676 mm
975 mm
Undercarriage Type
Crawler — steel tracks
Rubber/Steel tracked mini‑excavator undercarriage
Undercarriage Type
Crawler — steel tracks
Rubber/Steel tracked mini‑excavator undercarriage
Steering & Brakes
Overall Length
9570 mm
5520 mm
Overall Length
9570 mm
5520 mm
Overall Width
2800 mm
1960 mm
Overall Width
2800 mm
1960 mm
Overall Height
3250 mm
2551 mm
Overall Height
3250 mm
2551 mm
Cab Height
3250 mm
2551 mm
Cab Height
3250 mm
2551 mm
Boom Height
3.300 m
2.208 m
Boom Height
3.300 m
2.208 m
Track Width
600 mm
400 mm
Track Width
600 mm
400 mm
Performances
Travel Speed
10 km/h
4.6 km/h
Travel Speed
10 km/h
4.6 km/h
Swing Speed
10 rpm
11 rpm
Swing Speed
10 rpm
11 rpm
Gradeability
27 %
35 %
Gradeability
27 %
35 %
Drawbar Pull
150 kN
38.1 kN
Drawbar Pull
150 kN
38.1 kN
Bucket And Attachments
Bucket Capacity
1 Cu.m
0.22 Cu.m
Bucket Capacity
1 Cu.m
0.22 Cu.m
Bucket Options
0.8
0.14 - 0.22
Bucket Options
0.8
0.14 - 0.22
Attachment Compatibility
Breaker, Auger, Grapple (with auxiliary hydraulics)
Breakers, augers, quick couplers (optional)
Attachment Compatibility
Breaker, Auger, Grapple (with auxiliary hydraulics)
Breakers, augers, quick couplers (optional)
Cabin And Controls
Cabin AC
Yes
Yes
Cabin AC
Yes
Yes
Display Type
8 LCD Touch Screen
Standard machine display
Display Type
8 LCD Touch Screen
Standard machine display
Joystick Controls
Yes
Yes
Joystick Controls
Yes
Yes
Seat Type
Suspension Seat
Adjustable suspension seat
Seat Type
Suspension Seat
Adjustable suspension seat
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
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 55Z
Pros
- 48 hp (35.7 kW), Stage‑compliant engine with ~143 Nm torque helps keep jobs moving.
- Excellent for working close to walls/obstacles in confined sites without damaging structures.
- 3.8 m digging depth and ~6.1 m reach offers versatility across trenching and site prep
