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SCUBAPRO MK 25/MK 20 First Stages
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
2003 SCUBAPRO
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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.
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Summary of Contents for Uwatec MK 25
- Page 1 First Stages USE THIS GUIDE AS A REFERENCE WHEN SERVICING THE MK 25 AND 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.
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SCUBAPRO MK 25/MK 20 First Stages TOOLS NEEDED FOR REPAIR OF MK 25-MK 20 TOOLS NEEDED Quantity Part Number Description Ratchet 20-155-500 1” Yoke Nut Socket (Peter Built) 20.150-200 MK 25/MK 20 Assembly Tool (Peter Built) 1 set 10.102.100 Brass o’ring picks... - Page 3 SCUBAPRO MK 25/MK 20 First Stages 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.
- Page 4 SCUBAPRO MK 25/MK 20 First Stages Remove the yoke nut and cap from the first stage. Loosen the star clip and remove the filter. Remove the yoke nut o’ring. For DIN Regulators Remove the filter retainer, spring, filter, DIN adapter and o’ring.
- Page 5 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 wrench. NOTE: The adjusting screw is turned clockwise to remove.
- Page 6 SCUBAPRO MK 25/MK 20 First Stages No tools needed this step TOOLS NEEDED 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.
- Page 7 SCUBAPRO MK 25/MK 20 First Stages 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.
- Page 8 SCUBAPRO MK 25/MK 20 First Stages 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.
- Page 9 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.
- Page 10 SCUBAPRO MK 25/MK 20 First Stages 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.
- Page 11 SCUBAPRO MK 25/MK 20 First Stages 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 retainer in the DIN fitting.
- Page 12 SCUBAPRO MK 25/MK 20 First Stages 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.
- Page 13 SCUBAPRO MK 25/MK 20 First Stages 3/8” Earlier models of MK 20 can be adjusted by adding/removing shims. Each can adjust the intermediate pressure 5 – 10 psi. No tools needed this step TOOLS NEEDED Replace the cap on the regulator body.