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D31/D37-22
C
R A W L E R
O
C
PERATOR
HST with electronic control
The D31/D37 is equipped with Komatsu-designed
Hydrostatic Transmission (HST) that allows for Quick-Shift
or variable speed selection. The HST consists of dual-path
closed-circuits with two variable displacement piston pumps
and two variable displacement travel motors. Hydrostatic
steering eliminates steering clutches and brakes, providing
smooth powerful turns. Fully electronic control provides full
automatic shifting and enables smooth control. Engine
speed is controlled using an electronic fuel control dial.
Comfortable ride with cab damper mounting
The D31/D37's cab mount uses a cab damper system that
provides excellent shock and vibration absorption which
conventional mounting systems are unable to match. The
silicon oil filled cab damper mount helps to isolate the cab
from the machine body, suppressing vibration and providing
a quiet, comfortable operating environment.
Boot
Rubber
Silicon oil
Photo may include optional equipment.
Spring
6
D
O Z E R
OMFORT
Photo may include optional equipment.
Palm command Proportional Pressure Control
(PPC)
PPC-controlled palm command joystick provides blade
control. Combined with the highly reliable Komatsu
hydraulic system, precise control is the result.
Closed-center Load Sensing System (CLSS)
hydraulic system
With CLSS hydraulics, blade lever stroke is directly
proportional to blade speed, regardless of the load and
travel speed. This results in superb fine controllability.
Palm Command Control System (PCCS)
The low-effort PCCS joystick controls all directional
movements including machine travel speed as well as
counter-rotation.
LH
R
Down Shift
D
URABILITY
Heavy-duty undercarriage
Large link, large bushing diameter, and wider sprocket teeth
extend undercarriage life.
Main frame
High-rigidity simple main frame structure combined with
thick plates and steel castings provide increased reliability
and durability.
Protected travel motors and final drives
Travel motors and final drives are mounted within the track
Up Shift
shoe width for protection from rocks and stumps, and for
improving durability.
F
Motor cover
Motor cover
RH
D3 1 /D37 -22
CRAWLER DOZER
F
EATURES
Modular design
Just like the D51. One of the design goals behind the
creation of the D31/D37 was to manufacture a more
durable machine. This was achieved by reducing
component complexity and using a strong modular design
for increased serviceability and durability.
One-piece nose guard
Simplified high-rigidity structure with thicker plates reduces
vibration and noise.
Strong and reliable drive train
The HST components have been newly designed to provide
higher reliability.
Also, the new system utilizes a new high efficiency filter and
hydraulic cap with a separate breather to minimize
contaminates.
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