MacDon M155 Operators Manual User Manual
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Term
Definition
N-DETENT
The slot opposite the NEUTRAL position on operator’s console.
NPT
National Pipe Thread: a style of fitting used for low pressure port openings. Threads
on NPT fittings are uniquely tapered for an interference fit.
ORB
O-ring boss: a style of fitting commonly used in port opening on manifolds, pumps
and motors.
ORFS
O-ring face seal: a style of fitting commonly used for connecting hoses and tubes.
This style of fitting is also commonly called ORS, which stands for O-ring seal.
PTO
Power Take-Off.
rpm
Revolutions per minute.
R-Series header
MacDon rotary disc header.
RoHS (Reduction of
Hazardous Substances)
A directive by the European Union to restrict the use of certain hazardous
substances (such as hexavalent chromium used in some yellow zinc platings).
SAE
Society Of Automotive Engineers.
Screw
A headed and externally threaded fastener that threads into preformed threads or
forms its own thread in one of the mating parts.
Self-Propelled (SP)
Windrower
Self-propelled machine consisting of a power unit with a header and/or conditioner.
Soft joint
A joint made with the use of a fastener where the joining materials are compressible
or experience relaxation over a period of time.
spm
Strokes per minute.
Tractor
Agricultural type tractor.
Truck
A four-wheel highway/road vehicle weighing no less than 7500 lbs (3400 kg).
Tension
Axial load placed on a bolt or screw, usually measured in pounds (lb) or Newtons (N).
T.F.F.T.
Turns from finger tight.
Torque
The product of a force X lever arm length, usually measured in foot-pounds (ft·lbf)
or Newton-meters (N·m).
Torque angle
A tightening procedure where the fitting is assembled to a precondition (finger
tight) and then the nut is turned further a number of degrees or a number of flats to
achieve its final position.
Torque-tension
The relationship between the assembly torque applied to a piece of hardware and
the axial load it induces in the bolt or screw.
UCA
Upper cross auger.
Washer
A thin cylinder with a hole or slot located in the center and is to be used as a spacer,
load distribution element, or a locking mechanism.
Windrower
Power unit of a self-propelled header.
WCM
Windrower control module.
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Revision A