Komatsu PC78MR-6 Mini Excavator Specs

Category: Mini Excavators ➔
Manufacturer: Komatsu ➔
Model: PC78MR-6 ➔

The Komatsu PC78MR-6 Mini Excavator is a powerful and versatile machine designed for various excavation tasks. With a maximum cutting height of 22.4 ft and a maximum digging depth of 15.6 ft, this excavator offers impressive reach and capabilities. Equipped with a turbocharged engine delivering 54 horsepower, along with a hydraulic pump flow capacity of 42.3 gpm, this machine ensures efficient performance on the job site. Additionally, with its compact design and user-friendly controls, the PC78MR-6 is suitable for navigating tight spaces while maintaining stability and power.

Boom/Stick Excavator Option 1

Komatsu PC78MR-6 Mini Excavator Boom/Stick Excavator Option 1 specifications
Max Cutting Height	21.60 ft (6.58 m)
Max Digging Depth	13.70 ft (4.18 m)
Max Loading Height	14.90 ft (4.54 m)
Max Reach Along Ground	22.90 ft (6.98 m)
Max Vertical Wall Digging Depth	9.60 ft (2.93 m)
Shipping Height of Unit	9.00 ft (2.74 m)
Shipping Length of Unit	20.40 ft (6.22 m)

Boom/Stick Excavator Option 2

Komatsu PC78MR-6 Mini Excavator Boom/Stick Excavator Option 2 specifications
Max Cutting Height	22.40 ft (6.83 m)
Max Digging Depth	15.60 ft (4.75 m)
Max Loading Height	15.70 ft (4.79 m)
Max Reach Along Ground	24.60 ft (7.50 m)
Max Vertical Wall Digging Depth	10.90 ft (3.32 m)
Shipping Height of Unit	9.00 ft (2.74 m)
Shipping Length of Unit	20.40 ft (6.22 m)

Bucket

Komatsu PC78MR-6 Mini Excavator Bucket specifications
Maximum Bucket Capacity	0.50 cu yd (0.38 cu m)
Minimum Bucket Capacity	0.20 cu yd (0.15 cu m)
Reference Bucket Capacity	0.40 cu yd (0.31 cu m)

Dimensions

Komatsu PC78MR-6 Mini Excavator Dimensions specifications
Ground Clearance	1.20 ft (0.37 m)
Height - Top of Cab	9.00 ft (2.74 m)
Removal Counterweight Clearance	2.50 ft (0.76 m)
Tail Swing Radius	4.70 ft (1.43 m)
Width to Outside of Tracks	7.70 ft (2.35 m)

Engine

Komatsu PC78MR-6 Mini Excavator Engine specifications
Aspiration	Turbocharged with aftercooler
Displacement	199.00 cu in (3,261.03 cu cm)
Engine Model	S4D95LE-3
Net Power	54.00 hp (40.27 kw)
Number of Cylinders	4
Power Measured @	1850 rpm

Operating Specifications

Komatsu PC78MR-6 Mini Excavator Operating Specifications specifications
Alternator Supplied Amperage	25 amps
Cooling System Fluid Capacity	2.80 gal (10.60 l)
Engine Oil Capacity	2.00 gal (7.57 l)
Fuel Capacity	33.10 gal (125.28 l)
Hydraulic Pump Flow Capacity	42.30 gpm (160.11 lpm)
Hydraulic System Fluid Capacity	29.10 gal (110.14 l)
Hydraulic System Relief Valve Pressure	3840.4 psi
Operating Voltage	24 volts
Operating Weight	18,232.30 lbs (8,270.04 kg)

Swing Mechanism

Komatsu PC78MR-6 Mini Excavator Swing Mechanism specifications
Swing Speed	10 rpm

Undercarriage

Komatsu PC78MR-6 Mini Excavator Undercarriage specifications
Drawbar Pull	14,550.00 lbs (6,599.78 kg)
Ground Pressure	5.4 psi
Max Travel Speed	2.70 mph (4.35 kph)
Number of Carrier Rollers per Side	1
Number of Shoes per Side	39
Number of Track Rollers per Side	5
Shoe Size	17.80 in (45.21 cm)
Track Gauge	6.20 ft (1.89 m)

Our Main Office

Construction Equipment Guide
470 Maryland Drive
Fort Washington, PA 19034
800-523-2200

About Us

Construction Equipment Guide covers the nation with its four regional newspapers, offering construction and industry news and information along with new and used construction equipment for sale from dealers in your area. Now we extend those services and information to the internet. Making it as easy as possible to find the news and equipment that you need and want.

Contents Copyrighted 2026, by Construction Equipment Guide, which is a Registered Trademark, registered in the U.S. Patent Office. Registration number 0957323. All rights reserved, nothing may be reprinted or reproduced (including framing) in whole or part without written permission from the publisher. All editorial material, photographs, drawings, letters, and other material will be treated as unconditionally assigned for publication and copyright purposes and are subject to Construction Equipment Guide’s unrestricted right to edit and comment editorially. Contributor articles do not necessarily reflect the policy or opinions of this publication.

Read our privacy policy here.
Mastodon