ASME B30.25-2003 pdf download

ASME B30.25-2003 pdf download.SCRAP AND MATERIAL HANDLERS.
Where backward stabilities exceed the minimum criteria, the manufachirer or assembler/modifier shall install safety signs in the operator’s cab warning of the hazards Involved in removing the front or placing it in an unstable position. The signs shall include the appropriate signal word according to ANSI Z535.4, and shall also be included in the operators manual. The manufacturer or assembler! modifier shall also state whether the unsafe condition occurs when the upper is positioned over the side, front, or rear of the base.
The general conditions for determination of the backward stability margin, applicable to all handlers, are as follows:
(a) handler to be equipped for operation with the recommended front
(b) front positioned to impose a minimum forward overturning moment
(c) handler to be unloaded and without grapple or magnet
(d) outriggers or stabilizers (if provided) fully retracted and stored in their travel position
(e) handler to be standing on a firm level supporting surface; rail-mounted handlers to be standing on a level track
(j) operating weight and conditions as spedfied in
SAE J2417
(g) handler equipped with the specified counterweight
25-1.2.2 Minimum Backward Stability Conditions With Front Installed
The following shall be the minimum acceptable backward stability conditions:
(a) For crawler handlers, the horizontal distance from the center of gravity of the entire handler to the axis of rotation shall not exceed 70% of the horizontal distance from the axis of rotation to the backward tipping axis in the least stable direction.
(b) For wheel- and rail-mounted handlers, with the longitudinal axis of the upper-structure perpendicular to the longitudinal axis of the base, the total load on all wheels on the side of the base under the front, shall not be less than 15% of the total weight of the handler.
(c) For wheel- and rail-mounted handlers, with the longitudinal axis of the upper-structure in line with the longitudinal axis of the base, in either direction, the total load on all wheels under the lesser loaded end of the base shall not be less than 15% of the total weight of the handler.
25-1.2.3 Minimum Backward Stability Conditions With Front Removed
With the conditions as stated in para. 25-1.2.1, but with the front removed, the following shall be the minimum acceptable backward stability conditions:
(a) For crawler handlers, the horizontal distance from the center of gravity of the entire handler, less the front, to the axis of rotation shall not exceed 90% of the horizontal distance from the axis of rotation to the backward tipping axis in the least stable position.
(b) For wheel- and rail-mounted handlers, with the longitudinal axis of the upper-structure less the front perpendicular to the longitudinal axis of the carrier, the total load on all wheels on the side of the base supporting the least load shall not be less than 5% of the total weight of the handler.
SECTION 25-1.3: SWING MECHANISM
25-1.3.1 Swing Control
The swing mechanism shall start and stop with controlled acceleration arid deceleration. The swing medianism shall meet the requirements of SAE 12393 for minimum performance and rating procedures. Use of the swing brake or reversing the control lever to achieve this criteria is acceptable if it is a normal operating procedure recommended by the manufacturer.
25-1.3.2 SwIng Braking Means and Locking Device
(a) AU handlers shall have a swing brake capable of bringing the upper structure to a complete stop as specified in SAEJ2393. The manufacturer and/or asscmblcr/ modifier shall verify the swing brake meets the specifications set forth in SAE J2393.
(b) Means shall be provided to prevent the rotation of the upper structure during transport. This can be accomplished by a swing lock or swing brake.
(c) If the handler is not equipped with a swing lock, the swing brake shall be applied automatically when the engine stops.
SECTiON 25-1.4: HANDLER TRAVEL
25-1.4.1 Travel Mechanism
(a) On rail-mounted handlers, when the travel znechanism must be temporarily deactivated in the normal course of the handler’s use, provision shall be made to disengage the travel mechanism from the cab or outside the handler body.
(b) On crawler-mounted handlers, travel performance shall be calculated and specified according to SAE J1309.