BS ISO 06015 pdf download – Earth-moving machinery —Hydraulic excavators and backhoe loaders- Methods of determining tool forces

BS ISO 06015 pdf download – Earth-moving machinery —Hydraulic excavators and backhoe loaders- Methods of determining tool forces.
3.14
operating mass
OM
mass of the base machine with equipment and empty attachment as specified by the manufacturer, and with the
operator (75 kg). full fuel tank and all fluid systems at the levels specified by the manufacturer
(ISO 6016:1998, definition 3.2.1)
working circuit hydraulic pressure
normal operating pressure applied to the specific circuit by the purr4s)
3.16
maximum relief circuit hydraulic pressure
maximum static pressure in a specific circuit limited by a relief valve at a flow no greater than 10% of the rated circuit flow
hydraulic limit
condition when the tool forces are limited by maximum relief circuit pressure
3.18
tipping limit
condition when the tool forces are limited by the onset of tipping of the machine
3.19
slipping limit
condition when the tool forces are limited by the machine slipping on the test surface
4 Measurement methods
4.1 Test site and general
The test site shall consist of a level, hard surface, with anchor points and space for using the measuring devices specified in 4.2.1 to 4.2.3. For measurements made below the ground plane, a space below that plane is requwed for acceptance of the machine tool and the measurement devices, the anchorage and any auxiliary equipment.
Al measurements shaM be accwate to within ±2 % or shall accord with an International Standard relative to test equipment ajracy.
In the prefened method, the force to be measured is applied directly to the force measuring device (4.2.1). If the force is applied via a pulley. its friction should be taken Into account. The wire rope (4.2.4) should be as short as possible to minimize the affect on accuracy.
4.2 Test apparatus
4.2.1 Force measuring device, of accuracy according to ISO 9248.
4.2.2 Hydraulic oil pressure measuring device, of accuracy according to ISO 9248.
4.2.3 Instrument(s) for measuring linear dimensions, of accuracy according to ISO 9248.
4.2.4 Wire ropes and shacklespulleysafety chains and adjustable supporting frames,
the required cylinder(s) shall be operated independently and the Vorce at the bucket lip or attactirnent recorded with the engine running at the manufacturer’s rated speed
A series of preliminary tests shall be conducted with the equipment boom arm and bucket at different angles in rotation to each other (10. by varying the cyltodar stroke), in order to obtain the optimum position giving the maximum force. The pos4Ion (angle) of the boom, arm and bucket at the optimum position shall be recorded.
4,5 Limit conditions
The limit condition for each test shall be noted.
If the hydrai4ic limit condition is reached, the report should note the system or circuit in which the maximum relief circuit hydraulic pressure was exceeded.
If the tipping limit condition Is reached, the tool force shall be measured after the onset of tipping.
If the slipping limit condition is reached, the machine shall be anchored and the reported results should indicate that the maximum tool force was obtained by anchoring the machine.
4.6 Pivot positions
When alternative pivot positions lor the boom, arm, attachment and cylinders and/or a telescopically adjustable boom are available, the relative pin positions of boom, arm and bucket fixing and/or the telescopic boom position as tested shall be recorded
4,7 Outnggers
For machines fitted with outriggers, the tests shall be conducted with the outriggers raised or lowered as specified by the rnanufacturer
4,8 Measurement procedure
4.8.1 General
Each test shall be conducted three times, and the maximum tool force for each test shall be no(ed the arithmetic mean of these three values shall be recorded in the test results.
The tool forces shall be measured In accordance with the specified requwements.
For buckets with a curved or pointed cutting edge, the tool forces shall be measured at the centre of the bucket width.