Tusa TR-350 Service Manual Download | Manualshive

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Summary of Contents for TR-350

Page 1: ...ASSEMBLY ASSEMBLY ADJUSTABLE SECOND STAGE 20 6 0 Disassembly Procedure TR 390 Adjustable Second Stage 20 6 1 Repair Replacement Schedule 24 6 2 Assembly Adjustable Second Stage 24 6 3 Exploded View Adjustable Second Stage 30 VII DISASSEMBLY ASSEMBLY NON ADJUSTABLE SECOND STAGE 31 7 0 Disassembly Procedure SS 350 Second Stage 31 7 1 Repair Replacement Schedule 34 7 2 Assembly Procedure SS 350 Secon...

Page 2: ...lators have average mechanical ability a good understanding of the operation of SCUBA regulators and adequate diving experience This manual is not intended for for use by divers in overhauling or attempted repair of regulators in the field Such practice by untrained persons is strongly discouraged and should be attempted only by trained personell when absolutely necessary Copyright 1995 by Tabata ...

Page 3: ...the following discussion High pressure air entering the yoke retainer inlet port of the first stage regulator passes through a sintered filter which helps prevents the entry of any foreign particles This air flow continues through the regulator body passages to the HP seat chamber where it flows across the annular gap between the HP seat and the end of the HP piston stem Here the air expands resul...

Page 4: ...ambient water pressure and intermediate air pressure This helps to assures that the effort to actuate the second stage will remain relatively constant with changing depth 2 2 ADJUSTABLE SECOND STAGE Refer to figure 2 2 for the following discussion The second stage of the TR 390 is a demand type regulator which acts to convert the intermediate air pressure into a near ambient inhalation pressure Du...

Page 5: ...and knob is turned clockwise when viewed head on it compresses the secondary spring allowing it to increase the total sealing force between the poppet and seat As this sealing force increases so does the effort required by the diver to generate a greater differential pressure across the diaphragm leading to valve actuation and air flow 2 3 NON ADJUSTABLE SECOND STAGE Refer to figure 2 3 for the fo...

Page 6: ...dust cap is snug and covering the conical filter area of the yoke If using the TR 390 IMPREX AD2 Adjustable second stage dial the adjustment knob fully clockwise in to prevent water from entering into the hose and first stage Using either of the following rinse methods is necessary A stream of fresh water from a hose or faucet directed around and especially into the holes in the first stage will f...

Page 7: ...determine service intervals extent of service required for the customers regulator Most components in a regulator have very high expected usable life based on the number of breathing cycles and exposure of the equipment The following calculation is meant to educate the Service Technician on how many cycles breathing a regulator may see from average use CYCLES DIVE DAYS YEAR X DIVE HOURS DAY x 20 B...

Page 8: ...nstant moisture exposure and will lead to accelerated corrosion of regulator valve components Diving with Enhanced Air Safe Air mixtures requires the regulator to be specially cleaned and lubricated See Section 12 2 USER MAINTENANCE Obviously a regulator that has been maintained extensively by the user will require far less overhauls to replace worn or corroded components Poor user maintenance ind...

Page 9: ...pplied o rings As part of the TUSA annual servicing policy it is recommended that all o rings be replaced to maintain the warranty Further details are available from the factory distributor Do not attempt to clean or lubricate o rings outside of the recommendations found in Section I 1 0 SEALING SURFACES All metal parts used in TUSA regulators are made of either a corrosion resistant stainless ste...

Page 10: ...TR 390 BALANCED PISTON FIRST STAGE SYMPTOM POSSIBLE CAUSES RECOMMENDATIONS LOW FLOW OR HIGH INHALATION EFFORTS 1 Cylinder valve not open I Open valve completely or clogged or overhaul needed 2 Sintered filter 7 clogged 2 Replace sintered filter 3 HP spring 18 coil weak or fatigued 3 Replace HP spring INTERMEDIATE PRESSURE LOW OR UNSTABLE 1 HP piston head o ring 21 damaged 2 HP piston 20 sealing ed...

Page 11: ...ustment tube ADJUSTMENT KNOB DIFFICULT TO TURN OR NO ACTION I Piston 28 or follower 30 is contaminated 2 Follower is stripped onto stem 31 3 Poppet and demand lever action are sticky or damaged 4 Secondary spring 29 corroded 5 Stem 31 threads are corroded 6 Debris trapped between knob and packing nut 34 7 Thrust washer 33 absent contaminated or worn 1 Disassembly Adjustment tube and clean all part...

Page 12: ...ust valve 5 distorted worn or bad 2 Diaphragm 24 not seated or torn 3 Tear in mouthpiece I 4 Cracked or damaged case 27 5 Stem o ring 32 worn or absent 6 Adjustment tube o ring 26 cut or absent 1 Clean purge button 2 Check first stage IP 3 Replace demand lever 4 Adjust per Section 8 I Check seal edge condition 5 Replace poppet seat or adjustable orifice 6 Adjust per Section 8 1 7 Replace washer 8 ...

Page 13: ... remove all attached hoses and port plugs Remember to use the proper wrench with each hose as required low pressure second stage hoses use a 9 16 open end wrench low pressure inflator hose use either a 9 16 or 1 2 open end wrench and high pressure gauge hose s use a 5 8 open end wrench 2 Prepare to remove the endcap 24 by inserting one 3 16 Allen wrench into one of L P plugs 22 on the end cap and ...

Page 14: ...ECORD FOR REPLACEMENT If the piston will be reused take steps at this time to protect the piston stem sealing edge from damage during handling 10 Remove the piston stem o ring 17 from the body 13 NOTE Removal or replacement of the piston stem o ring 17 located within the internal o ring groove of the main body 13 must be attempted using only the proper tools and patience View the main body through...

Page 15: ...ition If H P seat 10 does not dislodge and fall out by itself push it out from opposite end with a 3 16 Allen wrench Examine and record your findings on the condition of the HP seat looking for deep indentations contamination severe discoloration or debris RECORD FOR REPLACEMENT and DO NOT attempt to reuse if any of these conditions are found Section 4 0 for important guidelines NOTE DO NOT attemp...

Page 16: ...e of the main body Refer to figure 5 7 NOTE Replacement of the piston stem o ring 17 located within the internal o ring groove of the main body 13 must be attempted using only the proper tools and patience View the main body through piston entrance to locate the internal o ring groove The piston stem o ring seals against both the stem of the piston 20 and the internal o ring groove within the main...

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