Joyce RWB3250 - Manual (Page 3)

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replacement or refund of the purchase price, of any products or parts or components thereof
which are returned to Seller freight prepaid and which are defective in material or
workmanship. Products or parts or components thereof which are repaired or replaced by
Seller will be returned to Buyer freight collect. This warranty is not intended to cover
consumer products, as defined in the Magnuson-Moss Warranty-Federal Trade Commission
Improvement Act, 15 U. S. C. Sections 2301-12, which are purchased by Buyer for purposes
other than resale. If Buyer is not intending to resell the Products, and if the products are
consumer products as defined in the Magnuson-Moss Act, the foregoing warranty, but not the
limitation of Seller's liability, shall be null and void. EXCEPT AS EXPRESSLY STATED
ABOVE, SELLER MAKES NO WARRANTY, EXPRESS OR IMPLIED, WHETHER OF
MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE OR USE OR
OTHERWISE, ON THE PRODUCTS, OR ON ANY PARTS OR LABOR FURNISHED DURING
THE SALE, DELIVERY OR SERVICING OF THE PRODUCTS.
1-5 Precautions of Use and Installation
1. Side loading of the lifting screw is not permitted in the dynamic operation of the jack. A
limited side load is allowable in the static condition. Contact Joyce/Dayton for the
allowable side load for a specific application.
2. Mechanical stops are not provided on the lifting screw unless requested. It is the
customer’s responsibility to provide travel limit devices on all jacks. A mechanical stop, if
provided is only an auxiliary device to limit the travel of the lifting screw. Engaging a
mechanical stop during jack operation can cause damage to the internal jack mechanism.
3. In most applications, factory or manufacturer-assisted installation is not required. However,
it is necessary that appropriate, qualified personnel perform the installation of
Joyce/Dayton products.
4. Joyce/Dayton jacks are not rated for shock-loading, extreme vibration or critical speed
conditions (high speed or long-length screw.) It is the responsibility of the user to ensure
these conditions are not imposed on a jack or the power transmission equipment.
5. In the event that service or maintenance is required, the load must be secured or removed
before any work can begin. A brake motor does not qualify as securing the load. A failure
in other parts (e.g., a shaft or coupling) will allow the load to lower even though the brake is
engaged.
6. The ball screw jacks can be mounted and operated in any orientation. When used in a
horizontal position, the worm should be below the gear to ensure proper lubrication.
7. Never allow the jack to retract beyond the minimum closed position, as damage to the ball-
nut can occur.
8. Boots or protective bellows covers should be used to protect and keep the lifting screw
clean in dusty or abrasive environments.
9. Although ball screws are more efficient than machine screw jacks, wormgear jacks are not
considered continuous duty actuators. For continuous or high-duty cycles inquire with
your local sales representative or consult Joyce/Dayton Corp. regarding Bevel Ball
actuators.
1-6 General Installation instructions
1. Ensure that all personnel who will service or operate equipment are familiar with its use
and limitations.
2. Secure or remove the load before any installation procedures begin.
3. Be certain the rating of the jack meets or exceeds the load.
4. The jacks must be mounted on a structure sufficient to support the maximum possible
load. The structure must be rigid. An under-designed structure could lead to bending of the
lifting screw causing premature wear or failure.
5. Drive shaft alignment is critical. Mis-alignment will cause reversing stresses in rotating
members and will lead to fatigue failure.
6. In a system with shafts, miter boxes, etc., confirm that the shafts and jacks operate without
binding or excessive force before powered drive devices are engaged.
7. When fastening the load to a jack, make sure the jack is in the retracted position. This
positions the load accurately with respect to the jack screw centerline. Never pull the screw