Scubapro MK20-MK25 Repair Guide.pdf

SCUBAPRO MK 25/MK 20 First StagesRemove the yoke nut and cap from thefirst stage.Loosen the star clip and remove thefilter.Remove the yoke nut o’ring.6mmFor DIN RegulatorsRemove the filter retainer, spring, filter,DIN adapter and o’ring.Loosen the DIN fitting using a 6mm hexwrench.Remove the end cap.Loosen the seat retainer using aproperly sized wrench while holding thefirst stage with a first stage handle.©2003 SCUBAPRO4Important note: The following information is not designed to be a complete training guide for servicing the listed SCUBAPRO regulators. All SCUBAPROtechnicians are required to attend an annual service training program to insure safe handling and servicing of SCUBAPRO products. All SCUBAPRO techniciansmust be employed by an authorized SCUBAPRO facility.

SCUBAPRO MK 25/MK 20 First Stages3/8”On some early models of the MK 20this was loosened using a 3/8” hexwrench.Loosen the seat retainer while holdingthe first stage with a first stage handle.5/32”Remove the seat retainer. The highpressureseat assembly and spring cannow be removed.On the current version of the MK 25 theseat retainer is adjustable.Disassemble for cleaning using a 5/32”hex wrench.NOTE: The adjusting screw is turnedclockwise to remove.Use the universal tool to loosen the capfrom the body. Hold the regulator bodywith a first stage handle.©2003 SCUBAPRO5Important note: The following information is not designed to be a complete training guide for servicing the listed SCUBAPRO regulators. All SCUBAPROtechnicians are required to attend an annual service training program to insure safe handling and servicing of SCUBAPRO products. All SCUBAPRO techniciansmust be employed by an authorized SCUBAPRO facility.

SCUBAPRO MK 25/MK 20 First StagesP/N 43040000TOOLSNEEDEDNo tools neededthis stepSeparate the cap from the regulatorbody. Carefully remove the pistonassembly and spring.Use the brass pick (blunt end) tocarefully push the piston stem o’ringassembly from the regulator body.7/32”5/32”Use a 7/32” hex wrench to remove theswivel retainer from the regulator cap.Use a 5/32” hex wrench to remove thelow-pressure plugs.©2003 SCUBAPRO6Important note: The following information is not designed to be a complete training guide for servicing the listed SCUBAPRO regulators. All SCUBAPROtechnicians are required to attend an annual service training program to insure safe handling and servicing of SCUBAPRO products. All SCUBAPRO techniciansmust be employed by an authorized SCUBAPRO facility.

MonojectSCUBAPRO MK 25/MK 20 First Stages7/32”Following cleaning, inspect andlubricate o’rings and washer as shown.Reassemble the swivel retainer to theregulator cap using a 7/32” hex andtorque wrench. Apply 70 in-lbs/8 N-m.MonojectInsert the stem o’ring assembly usingthe stem o’ring insertion tool. Theo’ring should be lubricated to dynamicspecifications.Note that the washer with the ledgeshould be placed as shown duringreassembly.Push the assembly into the regulatorbody.©2003 SCUBAPRO7Important note: The following information is not designed to be a complete training guide for servicing the listed SCUBAPRO regulators. All SCUBAPROtechnicians are required to attend an annual service training program to insure safe handling and servicing of SCUBAPRO products. All SCUBAPRO techniciansmust be employed by an authorized SCUBAPRO facility.

SCUBAPRO MK 25/MK 20 First StagesRemove the insertion tool by twistingslightly and then pulling out, thenreverse the tool and re-insert it into theregulator body.Reassemble the piston assembly.Replace and lubricate the pistono’rings.Hold the o’ring insertion tool in place toinsure that the piston knife-edge is notdamaged during assembly.Thread the cap and swivel assemblyon the regulator body. Hold the o’ringinsertion tool in place to insure that thepiston knife-edge is not damagedduring assembly.Tighten the regulator body to the capand swivel assembly using the firststage handle and the universal tool asshown.©2003 SCUBAPRO8Important note: The following information is not designed to be a complete training guide for servicing the listed SCUBAPRO regulators. All SCUBAPROtechnicians are required to attend an annual service training program to insure safe handling and servicing of SCUBAPRO products. All SCUBAPRO techniciansmust be employed by an authorized SCUBAPRO facility.

SCUBAPRO MK 25/MK 20 First StagesMonoject5/32”Replace the high-pressure seat andreplace/lubricate the high-pressureo’ring. With the spring and the spacer,Insert in the regulator body.In the MK 25 the adjusting screwshould be re-inserted into the highpressureseat retainer using a 5/32”hex wrench.NOTE: To tighten the adjustmentscrew, turn counter-clockwise.Tighten the high-pressure seat retainer.Use a torque wrench to tighten to 130in-lbs/15 N-m.3/8”On some early models of the MK 20the seat retainer is tightened using a3/8” hex wrench.Tighten the high-pressure seat retainer.Use a torque wrench to tighten to 130in-lbs/15 N-m.©2003 SCUBAPRO9Important note: The following information is not designed to be a complete training guide for servicing the listed SCUBAPRO regulators. All SCUBAPROtechnicians are required to attend an annual service training program to insure safe handling and servicing of SCUBAPRO products. All SCUBAPRO techniciansmust be employed by an authorized SCUBAPRO facility.

SCUBAPRO MK 25/MK 20 First StagesMonojectReplace the filter and star retainer.Lubricate the yoke nut o’ring.Insert the filter, o’ring, and star retainerinto the yoke nut. Assemble with theyoke saddle.MonojectFor DIN RegulatorsLubricate the DIN fitting-to-body o’ring.Assemble the o’ring and DIN fitting tothe regulator body.Reassemble and tighten the yoke nutto the regulator body. Torque to 266in-lbs/30 N-m.Place the yoke cover on the yoke.©2003 SCUBAPRO10Important note: The following information is not designed to be a complete training guide for servicing the listed SCUBAPRO regulators. All SCUBAPROtechnicians are required to attend an annual service training program to insure safe handling and servicing of SCUBAPRO products. All SCUBAPRO techniciansmust be employed by an authorized SCUBAPRO facility.

SCUBAPRO MK 25/MK 20 First Stages6mmFor DIN RegulatorsTighten the DIN fitting using a 6mmhex. Torque to 266 in-lbs/30 N-m.Hold the first stage using the first stagehandle.For DIN RegulatorsReplace the filter and assemble thespring, filter and filter retainer in theDIN fitting.©2003 SCUBAPRO11Important note: The following information is not designed to be a complete training guide for servicing the listed SCUBAPRO regulators. All SCUBAPROtechnicians are required to attend an annual service training program to insure safe handling and servicing of SCUBAPRO products. All SCUBAPRO techniciansmust be employed by an authorized SCUBAPRO facility.

SCUBAPRO MK 25/MK 20 First Stages5/32”For DIN RegulatorsTighten the filter retainer with a 5/32”hex. Torque to 35 in-lbs/4 N-m. Holdthe first stage using the first stagehandle.Check the intermediate pressure usingthe pneumatic adjusting tool.Intermediate pressure range: 125psi to145psi at 3000psi and 300psi supplypressure.5/32”Intermediate pressure adjustments canbe made using the adjusting screw onthe high-pressure seat retainer. Use a5/32” hex wrench.CAUTION: Be certain that supply air isturned off and regulator is purged priorto making adjustments.©2003 SCUBAPRO12Important note: The following information is not designed to be a complete training guide for servicing the listed SCUBAPRO regulators. All SCUBAPROtechnicians are required to attend an annual service training program to insure safe handling and servicing of SCUBAPRO products. All SCUBAPRO techniciansmust be employed by an authorized SCUBAPRO facility.

SCUBAPRO MK 25/MK 20 First Stages3/8”Earlier models of MK 20 can beadjusted by adding/removing shims.Each can adjust the intermediatepressure 5 – 10 psi.P/N 43040000TOOLSNEEDEDNo tools neededthis stepReplace the cap on the regulator body.©2003 SCUBAPRO13Important note: The following information is not designed to be a complete training guide for servicing the listed SCUBAPRO regulators. All SCUBAPROtechnicians are required to attend an annual service training program to insure safe handling and servicing of SCUBAPRO products. All SCUBAPRO techniciansmust be employed by an authorized SCUBAPRO facility.