Dive Rite XT2 User manual

XT2 Second Stage
Service Manual
Copyright 2018 Lamartek Inc. dba Dive Rite
1

Warning
•This manual is only to be used as a guide for
trained regulator technicians. Possession of this
guide does not qualify any individual in the
service of Dive Rite Breathing Systems. Only
qualified Dive Rite dealers can service Dive Rite
Products. Improper servicing can lead to serious
injury or death.
•Only Original Parts ordered from Dive Rite
are to be used
2

3
Table of Contents
•Pages 4 Required Tools
•Pages 5 Schematics
•Pages 6-15 Disassembling the Second Stage
•Pages 16-27Assembling the Second Stage
•Pages 28-36 Reversing the Hose Routing
•Pages 37-40 Tuning and Adjusting Dive Rite Regulators

Required Tools
•11/16 wrench
•11/16 tappet wrench
•Flat-blade screwdriver
• ¼” wood or plastic dowel
4

5
# Part Number Description
1 RG1426 XT2 - SS - MOUTHPIECE
2 RP9320 XT2 - SS - NYLON TIE
3 RG5203 XT2 - SS - MAIN HOUSING
4 RG5204 XT2 - SS - EXHAUST VALVE
5 RG5205 XT2 - SS - EXHAUST COVER
6 RG5206 XT2 - SS - DIAPHRAGM
7 RG5207-M XT2 - SS - DIAPHRAGM WASHER
8 RG5208 XT2 - SS - COVER - BLACK
9 RG5209 XT2 - SS - BUTTON SPRING
10 RG5210 XT2 - SS - PURGE BUTTON
11 RG5211 XT2 - SS - ADJUST KNOB
12 RG5212 XT2 - SS - ORING
13 RG5213 XT2 - SS - BALANCE CYLINDER
14 RG5214 XT2 - SS - SPRING
15 RG5215 XT2 - SS - ORING
16 RG5216 XT2 - SS - PISTON
17 RG5217 XT2 - SS - LP SEAT
18 RG1404 XT2 - SS - ORING
19 RG5219 XT2 - SS - ADJUST TUBE
20 RG5220 XT2 - SS - ADJUST KNOB PIN
21 RG5221 XT2 - SS - LEVER ARM
22 RG1411 XT2 - SS - ORING
23 RG5223 XT2 - SS - ORIFICE
24 RG5224 XT2 - SS - DEFLECTOR KNOB
25 RG1428-SL XT2 - SS - ORING
26 RG5226 XT2 - SS - BUSHING
27 RG5227 XT2 - SS - NUT
28 RG5228 XT2 - SS - BODY INSERT

*You must use two wenches to remove or
install a hose onto the XT2 second stage.
Damage to internal components may result
from improper hose removal or installation.
1) An 11/16 tappet wrench is used to hold the
Nut (27) in place while another 11/16 wrench
is used to loosen and remove the hose
6
Disassembling the XT2 Second Stage

2) Remove the Cover (8),
Diaphragm Washer (7), and
Diaphragm (6)
7
3) Use an 11/16 wrench to loosen
and remove the Nut (27)

8
4) Depress the Lever Arm (21) and pull
on the Adjustment Knob (11) to remove
the adjustment tube assembly
5) Remove the Bushing (26), Body
Insert (28), and O-rings (18, 25)
*Note the orientation of the Body Insert
before removal

9
6) Remove the Deflector Knob (24).
*Hold down the Lever (21) and slide
the Deflector Knob over the Lever until
it stops. Rotate the Deflector Knob 180
degrees and slide it off the rest of the
way.
7) Remove the O-ring (25) from the
Deflector Knob (24)

10
8) Remove the Adjustment Knob
Pin (20)
*If the Pin is tight rotate the
Adjustment Knob (11) so that it is
in the middle of its adjustment
range. The pin cannot be
removed if the adjustment knob is
turned all the way in either
direction.
9) Remove the Adjustment Knob
(11), and the LP valve assembly.
*It may be necessary to push the
valve assembly out by inserting a
hex key through the inlet

11
10) Remove the O-rings (18, 12)

12
11) Remove the LP Seat (17) and
the two O-rings (15)

13
12) Use a flat-blade screwdriver to
loosen the Orifice (23) and then push
it out with a wooden dowel
13) Remove the O-ring (22)

14
14) Use a heat gun to heat the Exhaust
Cover (5). This will soften the material
allowing it to be easily removed
15) Remove and inspect the Exhaust
Valve (4) for damage.
*This part will be reused as long as it
is not damaged.

Warning!!! Only original Dive Rite parts are to be used
•Parts should be cleaned in a solution compatible
with Oxygen use.
•All points of lubrication (O-rings, Etc.) require the
use of an Oxygen compatible lubricant. I.E.
Tribolube 71
15
This completes disassembly of the XT2 Second Stage

16
Assembling the XT2 Second Stage
1) Install the Exhaust Valve (4)
2) Use a heat gun to heat the Exhaust
Cover (5). This will soften the material
allowing it to be easily installed

17
3) Install O-ring (22) onto the Orifice (23)
4) Install Orifice (23) into the Adjustment
tube and tighten with a flat-blade
screwdriver
*The Orifice should be screwed in until it
stops then unscrewed 1.5 turns

18
5) Install the LP Seat (17) and O-rings
(15) onto the Piston (16)
*Apply a small amount of grease to
the LP Seat stem to allow it to install
fully.

19
6) Install the O-ring (12) onto the
Adjustment Knob (11)
7) Install O-ring (18) onto
Adjustment Tube (19)

20
8) Install Piston (16) into the
Adjustment Tube (19)
*The lever catch on the Piston
must be properly aligned with the
Lever