It is the responsibility of the user to insure that proper and comprehensive training of operators has been performed and all environmental and safety precautions observed. Mod-U-Blast Inc. provides a variety of excellent products to the surface preparation industry, and we are confident that all proficient users, operators and contractors in this industry will continue to use our products in a safe and knowledgeable manner.
The carriage adjusts for cleaning pipe from 12” (300mm) to 36” (900mm). The TWISTER HD is a pneumatic tool that is used as an accessory to a standard blast machine. Compressed air powers the air motor for control of the blast head rotation speed allowing infinite flexibility for varying degrees of contamination of the steel surface.
TWISTER ASSEMBLY Remove the main Twister body from the crate as shown. Remove the blast hose coupler. Install back wheel bracket (the back bracket has a collar) and position the indent to clear the air inlet of the air motor as shown. Tighten the set screws in the bracket to the collar and replace the hose coupler.
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TWISTER ASSEMBLY Cont’d Remove the 3 screws at the front end of the Twister Install the front wheel bracket and replace the screws as shown. Do not tighten the screws yet. Install wheels the same as the back bracket and line the front and back wheels up on the same angle then tighten the front screws.
SAFETY: WARNING! IMPORTANT WARNINGS FOR SAFER BLAST CLEANING The Twister operator and anyone within 50 feet of the work area must wear NIOSH approved respirator. Do not use abrasive containing free silica. Do not blast with damaged or worn equipment. ...
SET-UP: The Twister HD Blast tool attaches to the end of a pipe lance or blast hose in place of a standard nozzle. The compressor, blast hose/lance and air supply line for the air motor must be sized to support the blast operation at the pressure and air capacity shown on page 4 of this manual.
OPERATION: Connect the air and blast lines to the blast equipment as described in the applicable operation manuals. Push the Twister tool through the pipe until the blast head almost exits the opposite end. Open the air supply to the air motor. Adjust the air pressure to rotate the blast head (85 -100 psi).
DAILY MAINTENANCE: The daily and every 100 hr. maintenance must be performed to achieve maximum blasting performance of this tool. The instructions shown on next few pages are the most crucial for keeping the tool working at its best. NOTE: 2-3 drops of air tool oil or automatic transmission fluid (ATF) should be added to the air inlet port on the pneumatic air motor before and after each daily use.
100 HOUR MAINTENANCE: Remove the abrasive tube using the tool provided. Inspect the lip seal & the felt seal under it. Very important that this seal is in good shape so that the gear box won’t fill with media. NOTE: This seal will get damaged if the nylon tube wears out.
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100 HOUR MAINTENANCE cont’d: Unscrew the housing from the air motor To inspect or change the drive gears in the air motor it needs to be placed in a vise as shown and lightly heat the collar in order to break the loctite.
GEAR BOX SCHEMATIC Item Part Number Description 221719-1 GEAR BOX FRONT COVER 221714 LARGE BEARING 221713 SMALL BEARING 221719-2 GEAR SHAFT 221716 SMALL RETAINING RING 221722 NOZZLE HEAD GASKET 221719-3 LARGE GEAR 221714 LARGE BEARING 221717 LARGE RETAINING RING 221719-4 GEAR BOX BACK COVER 221712 FELT SEAL...
OPTIONAL AIR MOTOR CONNECTIONS The parts listed here show a quick & easy method we suggest for connecting the air motor. Our 1/2” push hose requires ‘no clamps’ and won’t let go. Contact your local Representative for pricing Part Number Description 448-8B 1/4”...
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