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U
U
NDERCARRIAGE
NDERCARRIAGE
F
F
AND
RAME
AND
RAME
Undercarriage
Advanced Resilient Equalized
Undercarriage (REU)
The Komatsu X-type bogie resilient
equalized undercarriage (REU) performs
independent see-saw movements. Tremen-
dous traction can be achieved even on
uneven ground, because the shoe always
follows the contour of the ground.
A rubber shock absorber is mounted on the
X-type bogie and decreases vibration and
shock. This X-bogie and rubber cushion
provide different absorption characteristics,
depending on the ground surface. When the
machine travels on flat ground, the REU
functions as a conventional rigid under-
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carriage. When the machine travels on
uneven ground, the REU maximizes the
suspension effect. The Komatsu REU
system improves traction, component
durability, and operator comfort.
Conventional Undercarriage
There is minimal shoe slippage with the
conventional low drive type undercarriage.
The shoe slip limit has been substantially
raised due to long tracks and large ground
contact area. The large traction force thus
obtained, in combination with high engine
power, results in superb drawbar pull. With
the low center of gravity, dynamic stability
is excellent.
Outer
Rubber
bogie
pad
Inner
bogie
Center
Shaft:
Fixed to track
Track
frame
roller
Flexibility
Flexibly grasps ground surface due to Komatsu's unique track-
roller design for more and better ground contact.
● Independent X-bogies and rubber pads (cushions) are
incorporated into the track rollers.
On flat ground
Track frame
Functions as a conventional rigid
undercarriage.
On uneven ground
Seesaw movement is performed
corresponding to ground surface.
Comfortable Ride on Uneven Ground
4
1
Flat ground travel Rough terrain travel
On uneven ground, the rubber pad provides four times the
suspension effect.
Frame
Flat Bottom Frame
The pivot shafts and monocoque frames prevent mud build-
up. The design facilitates good maneuverability in muddy
conditions and reduces the chance of hanging up on stumps
or boulders.
D155A-5
CRAWLER DOZER
Powerful Drawbar Pull for All Kinds of Terrain
The X-bogie and rubber pad provide different suspension
characteristics depending on the ground surface. On flat
ground, REU functions as a conventional rigid undercarriage.
On uneven terrain, the REU maximizes the suspension effect
the shoes always follow the contour of the ground, ensuring
a greater actual ground contact for greatly-improved
drawbar pull.
Ensures almost the same traction force as
a conventional rigid undercarriage.
Compared with a rigid type, the actual ground contact
area increases and powerful drawbar pull is ensured
because the track shoes follow the contour of the
ground. Large deformation of the rubber pads
contributes to greater suspension effect.
Minimum Shock in Riding Over Obstacles
Conventional
rigid type
A
REU
B
Obstacle height B
When riding over obstacles, the height of the machine fall is low.
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