Uwatec MK 25 - User Manual

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.
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

Uwatec MK 25 Specifications

General

Type	Dive Computer
Display	LCD
Nitrox Compatibility	Yes
Water Activation	Yes
Backlight	Yes
Water Resistance	100m
Gas Mixes	Multiple

Summary

SCUBAPRO Repair Guide MK 25;MK 20 First Stages

Tools Needed for Repair

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Initial Disassembly Steps

Yoke Nut and Cover Removal

Steps to remove the yoke nut and cover from the first stage assembly.

DIN Filter Retainer Loosening

Procedure to loosen the filter retainer on DIN regulators using a hex wrench.

Further Disassembly

Filter, DIN Adapter, and End Cap Removal

Instructions for removing the filter, DIN adapter, o'ring, and end cap.

Seat Retainer Removal

Steps for loosening and removing the seat retainer from the first stage.

Seat Retainer and Cap Removal Variations

MK 20 Early Model Seat Retainer

Details on loosening the seat retainer on earlier MK 20 models using a 3/8" hex wrench.

MK 25 Seat Retainer and Cap

Adjusting the seat retainer on MK 25 and disassembling the cap using a 5/32" hex wrench.

Piston and O-ring Assembly Removal

Piston Assembly and Spring Extraction

Separating the cap and removing the piston assembly and spring from the body.

O-ring and Low-Pressure Plug Removal

Using tools to remove the piston stem o'ring and low-pressure plugs.

Internal Component Reassembly

Swivel Retainer and Stem O-ring Installation

Reassembling the swivel retainer and inserting the stem o'ring assembly.

Washer Placement and Assembly Push

Ensuring correct washer placement and pushing the assembly into the regulator body.

Piston and Cap Assembly Reassembly

Piston Assembly and O-ring Replacement

Reassembling the piston assembly and replacing/lubricating piston o'rings.

Cap and Swivel Assembly Tightening

Threading and tightening the cap and swivel assembly to the regulator body.

High-Pressure Seat Reassembly and Tightening

High-Pressure Seat and O-ring Insertion

Replacing the high-pressure seat and o'ring with spring and spacer.

Seat Retainer Tightening

Tightening the high-pressure seat retainer using torque specifications.

Filter and Fitting Reassembly

Filter, O-ring, and Retainer Assembly

Assembling the filter, o'ring, and star retainer into the yoke nut and saddle.

DIN Fitting Lubrication and Assembly

Lubricating and assembling the DIN fitting to the regulator body.

Final Tightening and Fitting Procedures

DIN Fitting Tightening

Tightening the DIN fitting to the regulator body with specified torque.

DIN Filter and Retainer Assembly

Replacing the filter and assembling the spring and filter retainer in the DIN fitting.

Pressure Check and Adjustment

Intermediate Pressure Check

Checking intermediate pressure using the pneumatic adjusting tool.

Intermediate Pressure Adjustment

Making adjustments to intermediate pressure using the adjusting screw.

Final Assembly Step

Cap Replacement

The final step of replacing the cap onto the regulator body.