Used Komatsu 55Excavator

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📌 1. OVERVIEW

The Komatsu PC55 (PC55MR / PC55MR-3 / PC55UU / PC55US) is a 5-ton class mini (compact) excavator manufactured by Komatsu Ltd., one of the world's largest construction equipment makers. It is one of the most popular mini excavators globally, widely used in landscaping, utility work, construction, and pipeline projects.

The latest generation is the PC55MR-3 (launched ~2022), which replaces the PC55MR-2.

Feature	Detail
Class	5-Ton Mini Excavator
Manufacturer	Komatsu Ltd. (Japan)
Latest Model	PC55MR-3 / PC55UU-3 / PC55US-3
Production	Ongoing (global)
Emissions	Tier 4 Final / Stage V (EPA)

📌 2. ENGINE SPECIFICATIONS

Parameter	PC55MR-3	PC55MR-2
Engine Model	Komatsu SAA4D95LE-5	SAA4D95LE-3
Type	4-cylinder, turbocharged, intercooled diesel	4-cylinder, turbocharged, intercooled diesel
Displacement	2,494 cc (2.494 L)	2,494 cc
Rated Power	36.5 kW (48.9 HP) @ 2,000 rpm	35.3 kW (47.3 HP) @ 2,000 rpm
Max Torque	184 N·m (136 lb-ft) @ 1,400 rpm	181 N·m @ 1,400 rpm
Fuel Tank	~80 L (21.1 gal)	~80 L
Emissions Standard	Tier 4 Final / Stage V (DPF + DOC)	Tier 4 Final / Stage IV

✅ The engine features Komatsu's Common Rail fuel injection system for better fuel efficiency and lower emissions.

📌 3. HYDRAULIC SYSTEM

Parameter	Specification
Pump Type	2 × Variable Displacement Axial Piston Pumps
Max System Pressure	24.5 MPa (3,553 psi)
Total Flow Rate	2 × 108 L/min (2 × 28.5 gpm) = 216 L/min
Auxiliary Flow	~35 L/min (for attachments)
Swing Motor	Axial piston type

✅ The load-sensing hydraulic system optimizes fuel consumption by matching flow to demand.

📌 4. DIMENSIONS & WEIGHT

Parameter	PC55MR-3	PC55UU-3
Operating Weight	5,400 – 5,500 kg (11,905 – 12,125 lbs)	5,300 – 5,400 kg
Length (w/o boom)	5,150 mm (202.8 in)	5,150 mm
Width (w/ blade)	1,800 mm (70.9 in)	1,790 mm
Height (to cab top)	2,560 mm (100.8 in)	2,420 mm (with canopy)
Ground Clearance	350 mm (13.8 in)	350 mm
Track Width	1,200 – 1,400 mm (adjustable)	1,200 – 1,400 mm
Track Length (ground contact)	1,810 mm	1,810 mm
Tail Swing Radius	1,350 mm (53.1 in)	ZERO (Zero Tail Swing)

📌 5. PERFORMANCE (DIGGING SPECS)

Parameter	PC55MR-3	PC55UU-3
Max Digging Depth	3,760 mm (148.0 in)	3,710 mm
Max Digging Reach	5,750 mm (226.4 in)	5,700 mm
Max Digging Height	5,560 mm (218.9 in)	5,510 mm
Max Dumping Height	3,970 mm (156.3 in)	3,920 mm
Max Vertical Wall Dig	3,170 mm (124.8 in)	3,120 mm
Max Digging Force (Bucket)	35.5 kN (7,981 lbf)	34.5 kN
Max Digging Force (Arm)	25.0 kN (5,620 lbf)	24.5 kN
Bucket Capacity	0.08 – 0.22 m³ (1.0 – 2.9 cu yd)	0.08 – 0.22 m³

📌 6. TRAVEL & SWING

Parameter	Specification
Travel Speed (High)	4.8 km/h (3.0 mph)
Travel Speed (Low)	2.9 km/h (1.8 mph)
Swing Speed	11 rpm
Swing Torque	8.8 kN·m
Gradeability	70% (35°)
Max Climb Angle	35°

📌 7. KEY FEATURES

Feature	Description
🔄 Zero Tail Swing (UU/US models)	The upper structure doesn't swing beyond the track width — ideal for tight/urban work
🛡️ ROPS / Canopy Options	Roll-Over Protective Structure or fully enclosed canopy with AC
🏗️ Dozer Blade	Available for grading & leveling
🔧 Boom Side-Shift	Left-side boom swing (200mm) for pipe & trench work
🪣 Quick Coupler Ready	Hydraulic quick coupler for fast attachment changes
📡 KOMTRAX Ready	Telematics system for fleet management & diagnostics
🪟 Wide-View Cab	Excellent visibility with large glass area
🌡️ Climate Control	Heater + AC (canopy models)
🔇 Low Noise	~72 dB(A) — one of the quietest in its class
🛞 Rubber Track Option	Available for road travel & sensitive surfaces

📌 8. MODEL VARIANTS

Model	Tail Swing	Cab Type	Key Difference
PC55MR-3	Conventional (tail swing)	Open ROPS	Most versatile, widely used
PC55MRX-3	Conventional	Open ROPS	Extended arm (long reach) — +1m reach
PC55UU-3	Zero Tail Swing	Canopy (enclosed)	Best for urban/tight spaces
PC55US-3	Zero Tail Swing	Open ROPS	Compact urban work
PC55-2	Conventional	Open ROPS	Older generation (still in use)
PC55MR-2	Conventional	Open ROPS	Previous gen (replaced by MR-3)

📌 9. ATTACHMENTS COMPATIBILITY

The PC55 supports a wide range of hydraulic attachments via the quick coupler system:

Attachment	Use
🪣 Buckets (various sizes)	General digging
🔨 Hydraulic Breaker (Hammer)	Demolition, concrete breaking
🪓 Hydraulic Thumb	Grappling, sorting
🔩 Auger / Drill	Post holes, piling
🪚 Hydraulic Saw	Tree cutting, concrete
🧹 Rake / Grapple	Landscaping, debris
🗜️ Compactor Plate	Soil compaction
🧹 Brush Cutter	Vegetation clearing
❄️ Snow Blade	Snow removal
🪣 Tiltrotator	360° attachment rotation

📌 10. COMMON APPLICATIONS

Industry	Applications
🌿 Landscaping	Garden excavation, tree planting, grading
🔌 Utility Work	Trenching, pipe laying, cable installation
🏗️ Construction	Foundation work, small building sites
🔨 Demolition	Small building tear-down, concrete breaking
🌾 Agriculture	Drainage, fence post holes, land leveling
🛣️ Road Work	Trenching, utility cuts, road repair
🏢 Urban/Indoor	Zero-tail-swing models for tight city spaces
📦 Rental	Very popular in rental fleets worldwide

📌 11. COMPETITORS COMPARISON

Spec	Komatsu PC55MR-3	CAT 305.5 E2	Kubota KX057-4	John Deere 50G
Weight	5,500 kg	5,470 kg	5,370 kg	5,380 kg
Power	48.9 HP	48 HP	47.8 HP	50 HP
Dig Depth	3,760 mm	3,740 mm	3,690 mm	3,660 mm
Tail Swing	Conventional / Zero	Conventional	Conventional	Conventional
Emissions	Tier 4 Final	Tier 4 Final	Stage V	Tier 4 Final
Price (approx.)	$55K – $75K	$55K – $75K	$50K – $70K	$55K – $75K

📌 12. PRICING (Approximate — 2024)

Configuration	USD (Approx.)
PC55MR-3 (Open ROPS)	$55,000 – $65,000
PC55UU-3 (Canopy)	$62,000 – $75,000
PC55MRX-3 (Long Reach)	$65,000 – $78,000
Used (2018-2022)	$35,000 – $55,000

⚠️ Prices vary by region, dealer, and options.

📌 13. PROS & CONS

✅ PROS	❌ CONS
Excellent fuel efficiency (~3-4 L/hr)	Limited lifting capacity vs larger excavators
Zero tail swing option (UU/US)	Narrow track width limits stability on soft ground
Reliable Komatsu engine	Cab can feel cramped for tall operators
Strong resale value	Attachment flow is moderate (~35 L/min)
Low maintenance costs	Not suitable for heavy-duty mining/large-scale work
Komatsu global dealer network	Parts can be expensive in some regions
Very low noise level

📌 14. SUMMARY

Rating Category	Score (out of 10)
🔧 Performance	⭐ 8.0
& Efficiency	⭐ 9.0
🛠️ Reliability	⭐ 9.5
💰 Value for Money	⭐ 8.5
🔧 Versatility	⭐ 8.5
🔇 Comfort	⭐ 7.5
OVERALL	⭐ 8.5 / 10

🎯 Bottom Line: The Komatsu PC55 is one of the best 5-ton mini excavators on the market — combining Komatsu's legendary reliability, excellent fuel economy, and great versatility. Whether you need it for landscaping, utility work, or rental, the PC55 is a top-tier choice. 🏆

Would you like me to go deeper into any specific area — like maintenance schedule, hydraulic diagrams, or comparison with a specific competitor? 🚜