KEEP FOR FUTURE REFERENCE INSTRUCTIONS International Version P.O.
TABLE OF CONTENTS SPECIFICATIONS ............................................................................................................ 3 WARNINGS ..................................................................................................................... 4 OPERATING FEATURES ................................................................................................... 5 ASSEMBLY .............................................................................................................
MAINTENANCE ............................................................................................................. 18 INSPECTION SCHEDULE ............................................................................................................. 18 Every-Lift Inspection ..................................................................................................................................18 Frequent Inspection ...............................................................................
SPECIFICATIONS Description: Model Number: Vacuum Pads: Designed for use with a crane or other hoisting equipment, MRT4-DC lifters employ vacuum to hold a load for lifting, and they provide manual 360° rotation and manual 90° tilt movements for load manipulation. MRT49DC MRT4HV11DC 9" [23 cm] nominal 10" [25 cm] nom. dia., 11" [28 cm] nom. dia.
WARNINGS Powr-Grip is pleased to offer the most reliable vacuum lifters available. Despite the high degree of security provided by this product, certain precautions must be observed to protect the operator and others. Always wear personal protective equipment that is appropriate for the material being handled. Follow trade association guidelines. Always operate the lifter under conditions approved for its design (see INTENDED USE: OPERATING ENVIRONMENT).
OPERATING FEATURES Note: Components featured in the following instructions for assembling, operating or maintaining the vacuum lifter are underlined on their first appearance in each section. Standard MRT411LDC shown.
ASSEMBLY TO SET UP THE LIFTER 1) Open the shipping container and remove all materials for restraining or protecting the vacuum lifter. Save the container for use whenever the lifter is transported. 2) Suspend the lifter from a crane as follows: Select hoisting equipment (crane and hoist, when applicable) rated to carry the maximum load weight plus the lifter weight (see SPECIFICATIONS: Maximum Load Capacity and Lifter Weight).
WARNING: Make sure all vacuum hoses are coiled or routed so they cannot become entangled, kinked or punctured during rotation or tilt. MRT411LDC shown; see SPECIFICATIONS for other models’ Pad Spread. Basic Configuration This configuration provides a small, rectangular pad spread. Remove all 4 extension arms and mount the vacuum pads directly to the arm sockets on the main pad frame. Note: Keep one set of cotterless hitch pins with the extension arms at all times.
INTENDED USE LOAD CHARACTERISTICS WARNING: This lifter is NOT intended for lifting hazardous materials, such as explosives or radioactive substances. The operator must verify that the lifter is intended to handle each load, in accordance with the following requirements: • The load must not exceed the maximum allowable weight specified under Load Capacity (see SPECIFICATIONS). • The load must be a single piece of nonporous or semiporous material with a flat and relatively smooth contact surface.
OPERATING ENVIRONMENT The operator must determine whether the lifter is intended to be used in each work environment, in accordance with the following restrictions: WARNING: Never use lifter in dangerous environments. • This lifter is not intended for use in any environment that is inherently dangerous to the operator or likely to compromise the lifter's ability to function. Environments containing explosives, caustic chemicals and other dangerous substances must be avoided when using the lifter.
OPERATION BEFORE USING THE LIFTER The operator must determine whether the lifter is capable of performing each intended task, in accordance with the SPECIFICATIONS and INTENDED USE sections of this INSTRUCTIONS manual. In addition, all of the following preparations must be completed prior to lifting any load. Taking Safety Precautions The operator must be trained in all relevant industry and regulatory standards for the operation of the vacuum lifter in its geographical location (eg, ASME B30.
In order to be considered clearly audible, the alarm volume must exceed ambient noise by at least 15 dBA at the operator position.4 Since the Maximum Alarm Volume is 103 dBA, ambient noise must not exceed 88 dBA under any circumstances. Furthermore, if ambient noise measures 88 dBA, the alarm volume must be set to maximum and the operator must remain within 2 ft [60 cm] of the warning buzzer, in order for it to be effective.
Reading the Vacuum Gauge The vacuum gauge indicates the current vacuum level in the lifter’s vacuum system. The green range indicates vacuum levels sufficient for lifting the maximum load weight, whereas the red range indicates vacuum levels that are not sufficient for lifting the maximum load weight. The gauge needle should show a sudden surge in vacuum as the vacuum pads seal against the load.
TO LIFT AND MOVE THE LOAD Positioning the Lift Bar WARNING: Lift bar must be oriented vertically to lift load. Never lift the load from a flat position with the lift bar latched parallel to the load. Always disengage the tilt latch (see TO TILT THE LOAD to follow) and raise the lift bar to a vertical orientation before attempting to lift. Load Capacity and the Warning Light A lifter's Load Capacity is rated at a vacuum level of 16" Hg [-54 kPa] (see SPECIFICATIONS).
Monitoring the Low Vacuum Warning Buzzer (if applicable) If the lifter is equipped with a low vacuum warning buzzer, an alarm sounds until the lifter attains sufficient vacuum to lift the maximum load weight (see SPECIFICATIONS: Load Capacity). After the lifter has attained this vacuum level, the alarm stops sounding, to indicate that the lifter is ready to lift the load. WARNING: Never attempt to lift load while alarm is sounding.
TO ROTATE THE LOAD EDGEWISE WARNING: Never disengage both the rotation latch and the tilt latch at the same time. This lifter is not designed for rotation and tilt functions to be used at the same time. Disengaging the rotation and tilt latches simultaneously could cause uncontrolled and unpredictable load movement, potentially resulting in load damage or injury to the operator.
TO TILT THE LOAD WARNING: Never disengage both the rotation latch and the tilt latch at the same time This lifter is not designed for rotation and tilt functions to be used at the same time. Disengaging the rotation and tilt latches simultaneously could cause uncontrolled and unpredictable load movement, potentially resulting in load damage or injury to the operator. WARNING: Make sure load is positioned correctly on lifter (see TO APPLY); unbalanced loads may tilt unexpectedly when latch is disengaged.
AFTER USING THE LIFTER Leave the valve handle in the “RELEASE” position (power off). CAUTION: Do not set the lifter against any surfaces which could soil or damage the vacuum pads. Use the hoisting equipment to gently lower the lifter onto a stable support; then detach the hoisting equipment hook from the lift bail.
MAINTENANCE WARNING: Always make sure battery is disconnected before servicing lifter. Note: One or more wiring diagrams are provided in the final section of this INSTRUCTIONS manual for reference when servicing the lifter or trouble-shooting a deficiency. INSPECTION SCHEDULE Perform inspections routinely, according to the following frequency schedule: Every-Lift Inspection • Examine the vacuum pads and load surface for contamination or debris (see VACUUM PAD MAINTENANCE to follow).
• Keep a written record of all Periodic Inspections. If any deficiency is detected during the inspection, correct it before using the lifter. If necessary, return the lifter to Powr-Grip or an authorized dealer for repair (see LIMITED WARRANTY). Infrequent Use If a lifter is used less than 1 day in a 2-week period, perform the Periodic Inspection each time before using the lifter.
MAINTENANCE SCHEDULE Unless specified elsewhere in this INSTRUCTIONS manual, the lifter does not require maintenance on a routine basis. Instead, maintenance must be performed whenever a deficiency is indicated by routine inspections or tests. Any maintenance warranted must be performed before resuming normal operation of the lifter. BATTERY TEST The lifter is equipped with a battery gauge to help the operator evaluate whether the battery has adequate energy for lifting.
Identify the input voltage marked on the battery charger, and plug it in to an appropriate power source.11 The power source must be equipped with a ground fault circuit interrupter, in order to reduce the risk of electrical shocks. WARNING: Power source must be equipped with ground fault circuit interrupter. Usually a battery takes no more than 16 hours to charge completely, after which the charger shuts off automatically.
• Filter screen missing from pad face: This screen helps prevent debris from plugging the vacuum hose and the air filter. Replace any missing screen immediately (see REPLACEMENT PARTS LIST). • Nicks, cuts or abrasions in sealing edges: Pad damage can reduce the lifting capacity of the lifter. Replace any damaged pad immediately (see REPLACEMENT PARTS LIST). WARNING: Replace vacuum pad if sealing edge has any nicks, cuts or abrasions. • Wear, stiffness or glaze: See Friction Coefficient preceding.
VACUUM TEST Test the vacuum system for leakage routinely, as directed in the preceding INSPECTION and TESTING SCHEDULES. 1) Clean the face of each vacuum pad as previously directed (see VACUUM PAD MAINTENANCE: Cleaning). 2) Apply the lifter to a clean, smooth, nonporous surface. The surface should be flat or possess no more curvature than the lifter is designed for (if any).
AIR FILTER MAINTENANCE (for 1 oz [30 ml] bowl size filters) Filter Function and Conditions Requiring Service An air filter prevents solid particles and liquid from contaminating components in the vacuum system. CAUTION: Examine air filter regularly and empty when necessary. Liquid must not contact any portion of the filter element; remove trapped liquid regularly. Replace the element if it has an overall dirty appearance, or if there is a noticeable increase in the time required to attain full vacuum.
VACUUM PUMP MAINTENANCE − DYNAFLO DV1032102 WARNING: Before proceeding with any maintenance, disconnect power source. If the vacuum pump takes too long to attain full vacuum, it may require maintenance. Replace the diaphragm, gasket/flap valves or (when preferable) the entire head assembly15 (see REPLACEMENT PARTS LIST), as necessary to obtain acceptable pump performance. CAUTION: Do not over-tighten the head screws, because this may damage the threads in the pump body.
VACUUM PUMP MAINTENANCE − THOMAS 107CDC20 WARNING: Before proceeding with any maintenance, disconnect power source. If the vacuum pump (14) takes too long to attain full vacuum, it may require maintenance. Replace the diaphragm, valve flappers or head gasket as necessary to obtain acceptable pump performance (see REPLACEMENT PARTS LIST). Replacing the Diaphragm 1) Remove the four head screws (1) and remove the head (2).
VACUUM SWITCH ADJUSTMENT Vacuum Switch Function17 A vacuum switch controls the low vacuum warning light and the vacuum pump (see OPERATING FEATURES for location of vacuum switch): The valve handle activates the warning light and the pump, which evacuates the vacuum pads.18 After the lifter attains a vacuum level sufficient for lifting the maximum load weight (hereafter, “minimum lifting level”), the vacuum switch automatically turns off the pump and the warning light.
Adjustment Procedure WARNING: Lifting capacity decreases whenever vacuum switch is adjusted to maintain lower vacuum level. 1) Using a 1/4" open-end wrench (as provided), turn the adjustment screw about 1/6th turn at a time (approximately one flat of the screw head). To maintain a lower vacuum level, turn the screw clockwise (when viewing vacuum switch from end with electrical connectors).
REPLACEMENT PARTS LIST Stock No.
LIMITED WARRANTY Powr-Grip products are carefully constructed, thoroughly inspected at various stages of production, and individually tested. They are warranted to be free from defects in workmanship and materials for a period of one year from the date of purchase. If a problem develops during the warranty period, follow the instructions hereafter to obtain warranty service. If inspection shows that the problem is due to defective workmanship or materials, Powr-Grip will repair the product without charge.
Rev 26.
Rev 26.
