Abbrevia-
tion
Actual word spelled out
Purpose of use (major ap-
plicable machine (*), or
component/system)
Explanation
NC
Normally Closed
Electrical system, Hydraul-
ic system
Characteristics of electrical or hydraulic circuits.
Circuit is normally closed if it is not actuated, and
it opens when it is actuated.
NO
Normally Open
Electrical system, Hydraul-
ic system
Characteristics of electrical or hydraulic circuits.
Circuit is normally open if it is not actuated, and it
closes when it is actuated.
OLSS
Open-center Load
Sensing System
Hydraulic system
Hydraulic system that can operate multiple actua-
tors at the same time, regardless of the load.
PC
Pressure Compensation Hydraulic system
A function used to correct oil pressure.
PCCS
Palm command control
system
Steering
System in which a controller instantly analyses
data from each lever, pedal, and dial, and per-
forms optimum electronic control of the engine
and transmission.
(D)
PCV
Pre-stroke Control Valve Engine
This valve is installed at inlet port of pump and it
adjusts fuel intake amount in order to control fuel
discharged volume of supply pump.
PPC
Proportional Pressure
Control
Hydraulic system
This system is used for controlling proportional
pressure. It moves actuators in proportion to the
oil pressure.
PPM
Piston Pump and Motor
Hydraulic system
Piston type hydraulic pump and motor.
(D, PC, etc)
PTO
Power Take Off
Power train system
Power take-off mechanism.
PTP
Power Tilt and power
Pitch dozer
Work equipment
This function performs hydraulic control of the tilt
and pitch of the bulldozer blade.
(D)
ROPS
Roll-Over Protective
Structure
Cab and canopy
If a machine tips over, this structure protects the
operator wearing a seatbelt from being crushed.
(Operator Protective structure when tipping)
This performance is standardized as ISO 3471.
SCR
Selective Catalytic Re-
duction
Urea SCR system
It is exhaust gas purifier using urea water con-
verts nitrogen oxides (NO
x
) to harmless nitrogen
and water by oxidation-reduction reaction. It may
also be mentioned as exhaust gas purification
catalyst or part of the name of related devices.
SI
Le Systeme Internation-
al d' Unites (Internation-
al unit system)
Unit
Abbreviation for "Le Systeme International d' Uni-
tes". It is the universal unit system and "a single
unit for a single quantity" is the basic principle ap-
plied.
SOL
Solenoid
Electrical system
It refers to an actuator consisting of a solenoid
and an iron core that is moved by the magnetic
force when the solenoid is energized.
TWV
2-Way Valve
Hydraulic system
Solenoid valve that switches over direction of
flow.
*1: Code for applicable machine model
D: Bulldozer
HD: Dump truck
HM: Articulate dump truck
ABBREVIATION LIST
00 INDEX AND FOREWORD
00-22
PC290LC-11
