Demo Video
Description
This 1991-built Komatsu PC28UU is a professionally reconditioned mini excavator with its 2,980 Kg (6,571 pounds) operating weight. It only has 4,060 hours, and in great running condition with normal wear and tear as shown on our transparent photos and demonstration video. The machine is powered by a Yanmar-manufactured diesel engine (3D78-1F) which is capable of delivering 23.3 HP. This unit has been modified to adopt Caterpillar (S.A.E) control pattern by default. Reverting to original Komatsu (Japanese) control pattern is also possible via a built-in quick shifter.
This unit has been thoroughly serviced with new hydraulic fluids, new engine oils, new coolant with antifreeze, and new filters (air, fuel, and oil). We have upgraded the excavator with new foot-pedal-controlled hydraulic thumb, new seat & seat belt, new starting battery, new LED headlight, new decals, and vivid Komatsu-green paint. As required by U.S. CBP importing requirements, this unit has undergone strict fumigation and steam cleaning.
Product Features
This model has a highly-sought-after two-piece offset boom which is particularly useful for tight workspace applications with limited swing. If you are working in a tight alley, the boom can knuckle off to the right or left so that the machine can dig in line with one of the tracks up next to a structure. This model is qualified as a zero-tail swing machine with its 1495-mm upper body, 1450-mm overall width, and a tail swing radius of 790 mm (2'7"). This unit comes with single speed travel of 1.2 mph.
With Japanese ingenuity of applying sound-absorbing material to various parts of the machine, low noise performance comparable to that of a passenger car has been achieved. This model is designed for night work and urban areas such as schools and hospitals with noise level rated at 55 dBA @ 30 meter (98'5") and 66 dBA @ 7 meter (23'0"). To operator's ears, noise exposure is rated at only 77 dBA.
Product Manuals
General
- Make: Komatsu
- Model: PC28UU
- Serial #: 5786
- Track: Rubber (BRAND NEW) - $2,000 Extra Upgrade Cost
- Year built: 1991
- Hour meter: 4,060
- Origin: Japan
- Operating weight: 2,980 Kg (6,571 lbs)
- Bucket digging force: 2,140 Kg (4,718 lbs)
- Max ground pressure: 0.30 Kg/cm2 (4.3 psi)
- Swing speed: 9.5 rpm
- Swing max slope angle: ? deg.
- Travel speed: 2.0 kmh (1.2 mph)
- Gradeability: 30 deg.
Engine
- Make: Komatsu
- Serial #: 10136
- Fuel: Diesel
- Model: 3D78-1F (4-cycle, water-cooled, direct injection)
- No. of cylinders - bore x stroke: ?
- Piston displacement: 1.232 L (75.2 cu.in.)
- Firing order: ?
- Flywheel horsepower: 23.3 HP @ ? RPM
- Max torque: ? Kgm @ ? rpm
- Max speed at no load (high idling) : ? rpm
- Min speed at no load (low idling): ? rpm
- Min fuel consumption: ? g/HP.h
- Alternator: ?
- Starting Motor: ?
- Battery: ?
OEM Working Range

Recorded Dimensions
- Overall Length: 3,790 mm (12'5")
- Overall Width: 1,495 mm (4'11")
- Overall Height: 2,380 mm (7'10")
- Backfill Blade Width: 1,495 mm (4'11")
- Backfill Blade Height: 320 mm (1'1")
- Bucket Width: 430 mm (1'5")
- Thumb Width: 275 mm (0'11")
- Track Width: 300 mm (1'0")
- Track Length: 1,950 mm (6'5")
- Track Standard: 300mm (W) x 52.5mm (P) x 80 (L)
- Boom Cylinder: 702 mm (27.6")
- Arm Cylinder: 444 mm (17.5")
- Bucket Cylinder: 424 mm (16.7")
- Thumb Cylinder: 300 mm (11.8")
OEM Dimensions
