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TST-020 PT-AIR

– REV. 2017-246

Page 7 of 14

Once the vacuum generating system is confirmed to hold (no significant leaks noted per the
vacuum readings), re-connect the pad system, proceed to system confirmation and retest the
vacuum system as described.

Содержание POWER TILT

Страница 1: ...TST 020 PT AIR REV 2017 246 LEAK TEST PROCEDURE POWER TILT PT MODEL LIFTERS WITH AIR POWER SYSTEMS TESTING AND MAINTENANCE MUST BE DONE BY A QUALIFIED PERSON KEEP FOR FUTURE REFERENCE ...

Страница 2: ...TST 020 PT AIR REV 2017 246 ...

Страница 3: ...UM LEAK 1 DETERMINING LEAK EXISTENCE 1 ADDRESSING LEAK 1 BASIC REPAIR TIPS 2 PRELIMINARY TEST 3 VACUUM GENERATING SYSTEM TEST 4 PAD SYSTEM TESTS 8 SYSTEM CONFIRMATION 10 DIAGNOSTICS AIR POWERED PUMP VENTURI DIAGNOSIS 11 ACTUATOR TILTS AFTER STOPPING 12 ADDITIONAL INFORMATION 14 ...

Страница 4: ... ADDRESSING LEAK If the leak is sufficient to warrant repair Locate the cause of leak beginning by inspecting the vacuum pads fittings and hoses of the entire vacuum system Look for contamination cuts or abrasions on pad faces cracks in the pad suction stem cracks abrasions or cuts in hoses damaged fittings and loose hoses at connection points If leak is severe the cause is often a visibly damaged...

Страница 5: ...lease mode the vacuum system of this lifter provides quick release using a blow off feature where air is pumped into the pad system for faster load release When testing for leaks it is often necessary to seal off the system by capping off plugging fittings and lines or closing all pad shut offs Due to this the use of the release function is not recommended during the repair process Release mode wi...

Страница 6: ...he fitting of the vacuum filter as shown in FIGURE 1 Note The size plug needed may vary with lifter model 2 Repeat the vacuum test with the filter capped off If the vacuum level of the lifter s vacuum gauge holds steady and does not drop this indicates that the leak is located in the vacuum pad system between the filter and vacuum pads Proceed to Pad System Tests If the vacuum level of the lifter ...

Страница 7: ...th ball valve in the open position handle in line with valve apply vacuum When a sufficient level of vacuum is reached close the ball valve turn handle perpendicular to the valve and close the air supply valve to the venture air pump 4 Observe both the lifter s and ball valve s vacuum gauges If the vacuum level of the lifter s vacuum gauge starts and continues to drop a leak is located in either t...

Страница 8: ...um filter and cap off the fitting 4A See FIGURE 4 7 With the ball valve in the open position handle in line with the valve apply vacuum When a sufficient level of vacuum is reached close the ball valve turn handle perpendicular to the valve and close the air supply valve to the venturi pump 8 Observe the ball valve s vacuum gauge If the vacuum level of the ball valve s vacuum gauge starts and cont...

Страница 9: ... drain plug located at the base of the filter bowl should never be used when the filter is used on a vacuum system Verify that the drain plug is tight and has not been used If the twist drain has been used it will need to be removed and cleaned before reinstalling o Remove the filter bowl from the filter and remove the plastic nut that attaches the drain plug to the filter bowl o Remove the drain ...

Страница 10: ...7 246 Page 7 of 14 Once the vacuum generating system is confirmed to hold no significant leaks noted per the vacuum readings re connect the pad system proceed to system confirmation and retest the vacuum system as described ...

Страница 11: ... FIGURE 6 2 Repeat the vacuum test If the vacuum level of the lifter s vacuum gauge holds steady and does not drop The vacuum pad system does not leak between the vacuum filter and the shut off valves Proceed to step 3 If the vacuum level of the ball valve s vacuum gauge starts and continues to drop A leak does exist between the vacuum filter and the shut off valves o Examine the hoses hose connec...

Страница 12: ...fitting and a shut off valve are shown capped off Vacuum is then applied so the line up to the capped off section will be tested If the leak is no longer present it indicates that the leak is in the section past the capped off part or if the leak continues that the leak is between the capped off part and the filter In the right view caps were used to seal off four pad lines at the manifold 7 Check...

Страница 13: ...or service to a vacuum lifter Note If system is equipped with shut offs or quick connects a vacuum test should be performed with these parts in every manner of use i e shut off valves should be tested in both the open and closed position quick connect valves should be tested both when connected and disconnected All parts must be verified in relation to their function and the lifter must pass all v...

Страница 14: ...ure to the lifter even if there are other demands on the compressor e g if there are other demands for compressed air the compressor must be of a size that can meet those demands and still supply the lifter s power requirement Setting the pressure Attach the airline to the air pressure regulator of the lifter Open the air supply valve Note The type valve may vary with lifter model and age Place th...

Страница 15: ...ounted directly to the actuator ports The flow valves should be checked first The flow valves may leak past the seals that allow the valves to pivot When this happens air can typically be felt along the seams of the collar body of the flow valve With the air supply valve open tilt the lifter to the position where it drifts and check to see if air can be felt leaking around the body of the flow val...

Страница 16: ...hecked To check the actuator feed line ports Disconnect the air supply from the lifter Disconnect the hoses from the tilt control valve that connect to the flow valves of the actuator Reconnect the air supply to the lifter Note Do not engage the handle of the tilt valve assembly with the hoses removed Wrap a smooth towel 14A tight over the end of either of the ports that connect to the actuator Sp...

Страница 17: ...d during testing always apply thread sealant Teflon tape or similar product to the male threads prior to reassembly in order to avoid vacuum leaks For plastic fittings use only Teflon tape Liquid or paste sealants must not be used because they may damage plastic parts 5 When assembling fittings do not over tighten After first applying adequate thread sealant or tape the fitting should be finger ti...

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