TM 5-3820-241-34
nicks, and burrs. Remove small nicks with a fine
emery cloth.
(5) Inspect all hardware and threaded areas
for damage. Replace defective hardware retap
threaded areas or replace defective part.
4-4. Air Motor, Reassembly and Installation
a. Reassembly. Reassemble the air motor in
the reverse of numerical sequence as illustrated in
figure 3-15.
b. Installation. Refer to TM 5-3820-241-12
and install the air motor.
Section II. AIR PRESSURE REGULATOR
4-5. General
The air pressure regulator is an adjustable spring
diaphragm type control that regulates the
amount of air supplied to the hydraulic pump aid
drive motor. It is mounted just above the air
motor and is normally set at 65 psi.
4-6. Air Pressure Regulator, Removal and
Disassembly
a. Removal. Refer to TM 5-3820-241-12 and
remove the air pressure regulator.
b. Disassembly. Disassemble the air pressure
regulator in numerical sequence as illustrated in
figure 4-2.
ME 3820-241-34/4-2
1 Bonnet set screw
9 Spring
2 Bonnet
10 Air strainer
3 Spring rest
11 O-ring
4 Bonnet spring
12 Valve
5 Diaphragm rest
13 Valve seat
6 Diaphragm assembly
14 O-ring
7 Plug
15 Bonnet boot
8 O-ring
16 Adjusting screw
17 Locknut
4-7. Air Pressure Regulator Cleaning, Inspection
and Repair
a. Cleaning.
(1) Clean all
parts except O-rings and
diaphragm assembly in cleaning solvent (Fed
Spec PD 680) and dry thoroughly.
(2) Discard and replace all O-rings and the
diaphragm assembly.
b. Inspection and Repair.
(1) Inspect the valve and valve seat for
excessive wear or other damage.
(2) Inspect the strainer for holes or signs of
excessive strain.
NOTE
Most pressure regulator failures can be
corrected by the installation of a new
diaphragm assembly, O-rings, valve
strainer and springs.
(3) Repair by replacement of defective parts.
4-8. Air Pressure Regulator, Reassembly and
Installation
a. Reassembly. Reassemble the air pressure
regulator in the reverse of numerical sequence as
illustrated in figure 4-2.
b. Installation. Refer to TM 5-3820-241-12 and
install the air pressure regulator.
Figure 4-2. Air pressure regulator. disassembly and reassembly.
4-2
