Uwatec MK 20 Repair Manual Download Page 13

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SCUBAPRO MK 25/MK 20 First Stages



2003 SCUBAPRO

Important note

: The following information is not designed to be a complete training guide for servicing the listed SCUBAPRO regulators. All SCUBAPRO

technicians are required to attend an annual service training program to insure safe handling and servicing of SCUBAPRO products. All SCUBAPRO technicians
must be employed by an authorized SCUBAPRO facility.

3/8”

Earlier models of MK 20 can be
adjusted by adding/removing shims.
Each can adjust the intermediate
pressure 5 – 10 psi.

P/N

TOOLS
NEEDED

No tools needed

this step

Replace the cap on the regulator body.

Summary of Contents for MK 20

Page 1: ...CUBAPRO regulators All SCUBAPRO technicians are required to attend an annual service training program to insure safe handling and servicing of SCUBAPRO products All SCUBAPRO technicians must be employed by an authorized SCUBAPRO facility 1 SCUBAPRO Repair Guide MK 25 MK 20 First Stages USE THIS GUIDE AS A REFERENCE WHEN SERVICING THE MK 25 AND MK 20 FIRST STAGES ...

Page 2: ...Peter Built 1 Yoke Nut Socket 1 20 150 200 Peter Built MK 25 MK 20 Assembly Tool 1 set 10 102 100 Peter Built Brass o ring picks 1 tube 41 047 000 Christo Lube Christo Lube OXYGEN COMPATIBLE LUBRICANT P N 41 047 000 1 47 010 000 Counter Mat 1 41 496 101 Lubricant syringe Monoject 1 43 040 000 Universal Tool 1 20 115 100 Peter Built First Stage Handle 1 Torque Wrench 1 Hex Key Set 1 Crescent wrench...

Page 3: ...nd servicing of SCUBAPRO products All SCUBAPRO technicians must be employed by an authorized SCUBAPRO facility 3 Remove all hoses Thread the first stage handle into the high pressure port as shown Use the ratchet and yoke nut socket to remove the yoke nut from the first stage Remove the yoke cover if cleaning the yoke is indicated 5 32 For DIN Regulators Remove all hoses Thread the first stage han...

Page 4: ...d servicing of SCUBAPRO products All SCUBAPRO technicians must be employed by an authorized SCUBAPRO facility 4 Remove the yoke nut and cap from the first stage Loosen the star clip and remove the filter Remove the yoke nut o ring 6mm For DIN Regulators Remove the filter retainer spring filter DIN adapter and o ring Loosen the DIN fitting using a 6mm hex wrench Remove the end cap Loosen the seat r...

Page 5: ... by an authorized SCUBAPRO facility 5 3 8 On some early models of the MK 20 this was loosened using a 3 8 hex wrench Loosen the seat retainer while holding the first stage with a first stage handle 5 32 Remove the seat retainer The high pressure seat assembly and spring can now be removed On the current version of the MK 25 the seat retainer is adjustable Disassemble for cleaning using a 5 32 hex ...

Page 6: ... servicing of SCUBAPRO products All SCUBAPRO technicians must be employed by an authorized SCUBAPRO facility 6 P N 43040000 TOOLS NEEDED No tools needed this step Separate the cap from the regulator body Carefully remove the piston assembly and spring Use the brass pick blunt end to carefully push the piston stem o ring assembly from the regulator body 7 32 5 32 Use a 7 32 hex wrench to remove the...

Page 7: ...ll SCUBAPRO technicians must be employed by an authorized SCUBAPRO facility 7 Monoject 7 32 Following cleaning inspect and lubricate o rings and washer as shown Reassemble the swivel retainer to the regulator cap using a 7 32 hex and torque wrench Apply 70 in lbs 8 N m Monoject Insert the stem o ring assembly using the stem o ring insertion tool The o ring should be lubricated to dynamic specifica...

Page 8: ...ty 8 Remove the insertion tool by twisting slightly and then pulling out then reverse the tool and re insert it into the regulator body Reassemble the piston assembly Replace and lubricate the piston o rings Hold the o ring insertion tool in place to insure that the piston knife edge is not damaged during assembly Thread the cap and swivel assembly on the regulator body Hold the o ring insertion t...

Page 9: ... Monoject 5 32 Replace the high pressure seat and replace lubricate the high pressure o ring With the spring and the spacer Insert in the regulator body In the MK 25 the adjusting screw should be re inserted into the high pressure seat retainer using a 5 32 hex wrench NOTE To tighten the adjustment screw turn counter clockwise Tighten the high pressure seat retainer Use a torque wrench to tighten ...

Page 10: ...CUBAPRO products All SCUBAPRO technicians must be employed by an authorized SCUBAPRO facility 10 Monoject Replace the filter and star retainer Lubricate the yoke nut o ring Insert the filter o ring and star retainer into the yoke nut Assemble with the yoke saddle Monoject For DIN Regulators Lubricate the DIN fitting to body o ring Assemble the o ring and DIN fitting to the regulator body Reassembl...

Page 11: ...tend an annual service training program to insure safe handling and servicing of SCUBAPRO products All SCUBAPRO technicians must be employed by an authorized SCUBAPRO facility 11 6mm For DIN Regulators Tighten the DIN fitting using a 6mm hex Torque to 266 in lbs 30 N m Hold the first stage using the first stage handle For DIN Regulators Replace the filter and assemble the spring filter and filter ...

Page 12: ... by an authorized SCUBAPRO facility 12 5 32 For DIN Regulators Tighten the filter retainer with a 5 32 hex Torque to 35 in lbs 4 N m Hold the first stage using the first stage handle Check the intermediate pressure using the pneumatic adjusting tool Intermediate pressure range 125psi to 145psi at 3000psi and 300psi supply pressure 5 32 Intermediate pressure adjustments can be made using the adjust...

Page 13: ... are required to attend an annual service training program to insure safe handling and servicing of SCUBAPRO products All SCUBAPRO technicians must be employed by an authorized SCUBAPRO facility 13 3 8 Earlier models of MK 20 can be adjusted by adding removing shims Each can adjust the intermediate pressure 5 10 psi P N 43040000 TOOLS NEEDED No tools needed this step Replace the cap on the regulat...

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