TM 5-4220-226-14&P
4-14. One-Way Valve Assembly Maintenance - continued.
b. Installation
(1) Apply silicone lubricant to new preformed packing (3).
(2) Install preformed packing and one-way valve (1) into side block (2). Do not over tighten.
4-15. Demand Regulator Assembly Maintenance.
This task covers:
a. Adjustment
b.
Removal
c.
Disassembly
d. Cleaning and Inspection
e.
Repair
f.
Reassembly
g. Installation
INITIAL SETUP
Tools
Materials Required (continued)
Tool Kit, General Mechanic's (item 4, appx B)
Nonionic Detergent (NID) Solution
Regulator Adjustment Tool (item 1, appx B)
(item 3, appx E)
Silicone Lubricant (item 8, appx E)
Materials Required
Preformed Packing
Locknut
Soft Bristle Brush (item 1, appx E)
Clean, Lint-Free Cloths (item 2, appx E)
Equipment Conditions
Warm Fresh Water (item 4, appx E)
Whisker exhaust removed (para 4-20).
a. Adjustment
NOTE
The regulator can be removed from the helmet or left in
place on the helmet during adjustment.
For maximum regulator performance, allow the regulator to
sit for 24 hours with the dial-a-breath knob (4) screwed in
before adjusting. This will allow the rubber in the inlet valve
stem (5) to take a set against the inlet nipple (13). If this is
not possible, then adjust the lever (10) to favor the looser
limit of 1/8 inch so as to compensate for the inward travel of
the stem (5) after the valve (1 2) rubber has compressed.
All regulator parts should be free of damage and dirt.
All rubber components should be in excellent condition.
All internal parts should be lubricated with silicone lubricant.
(1) Remove clamp (1), cover (2), and diaphragm (3).
4-12
