7
6
R
ELIABILITY
F
EATURES
HYDRAULIC EXCAVATOR
PC1250
-8
0
Strengthened Quarry Bucket Provided Outstanding Wear-resistance (optional)
The bucket for specific use in quarry is impact and wear resistant, providing high performance and long life.
Koma-hard materials* provide excellent wear resistance. Combined with adoption of long-life XS teeth, durability of bucket is
drastically enhanced.
* Koma-hard materials (KVX materials):
Komatsu developed, wear-resistant, reinforced materials.
Brinell hardness: 500 or more (180kgf/mm
2
class).
Features high wear-resistance and little quality change
from the heat generated during rock loading, maintaining
long term hardness.
Excellent Reliability and Durability
Boom Foot Hoses
The boom foot hoses are arranged
under the boom foot to reduce hose
bend during operation, extending hose
life and improving operator safety.
Metal Guard Rings
Metal guard rings protect all the
hydraulic cylinders and improve
reliability.
Sturdy guards
shield the travel motors
and piping against damage from rocks.
High-pressure In-line Filtration
The PC1250-8 has the most extensive
filtration system available, providing
in-line filters as standard equipment.
An in-line filter in the outlet port of
each main hydraulic pump reduces
failures caused by contamination.
Track roller guard (full length)
(optional)
O-ring Face Seal
The hydraulic hose seal method has
been changed from a conventional
taper seal to an O-ring seal. This
provides improved sealing
performance during operation.
Fuel Pre-filter
(with Water Separator)
Removes water and contaminants from
fuel to enhance the fuel system reliability.
Sturdy Undercarriage
The undercarriage is strengthened to
provide excellent reliability and
durability when working on rocky
ground or blasted rock.
Quarry Bucket with XS Tooth
High-tensile strength steel
Koma-hard materials
Shroud: Enlarged
XS Tooth
• Unique bucket tooth shape, superior digging
performance
• Long-term high sharpness
• Great penetration performance
• Hammerless, safe, and easy tooth
replacement
(Tooth replacement time: Halves the
conventional machine.)
STEP 1
Observing proper safety procedures,
place tooth onto adapter (as shown).
STEP 2
Insert fastener, making sure it is in the
unlocked position (as shown).
STEP 3
Using the correct size socket, rotate the
pin locking shaft 90˚ clockwise (as
shown) to finish the installation.
STEP 4
To remove fastener, use the correct size
socket to rotate the pin locking shaft 90˚
counter-clockwise (as shown). Remove
fastener and tooth. Repeat steps 1-3 for
a new installation.
pin locking shaft
pin locking shaft
Heat-resistant Wiring
Heat-resistant wiring is utilized for the
engine electric circuit and other major
component circuit.
Circuit Breaker
With circuit breaker, the machine can
be easily restarted after repair.
DT-type Connectors
DT-type connectors seal tight
and have higher reliability.
Photo may include optional equipment.
Metal guard ring
(Cast iron ring)
Piston ring
Wear ring
H
Y D R A U L I C
E
X C A V A T O R
PC1250
-8
Strengthened Boom and Arm
Thanks to the large cross-sectional
structure employing a high tensile
strength steel with a thick plate,
partition wall, etc., the boom and arm
exhibit excellent durability and are
highly resistant to bending and
torsional stress.
Large cross sectional
structure boom
Arm dent
preventive plate
Partition
wall
Partition
wall
Wide width
arm
Wear plates
Tough strengthened frame
structure
Strengthened revolving frame, center
frame and crawler frame endure
heavy-duty works and exhibit their
excellent durability.
FEM stress
analysis
