TM 5-3820-241-34
MAINTENANCE OF AIR SYSTEM COMPONENTS
Section I. AIR MOTOR (Hydraulic Pump Drive Motor)
4-2. Air Motor Removal and Disassembly
4-1. General
a. Removal. Refer to TM 5-3820-241-12 and
This section covers repair instructions for the air
motor. The air drive motor is a pressure
remove the air motor.
regulated, vane type motor used to drive the
b. Disassembly. Disassemble the air motor in
hydraulic system. Pres sure is regulated at 65 psi,
numerical sequence as illustrated in figure 4-1.
b y a spring type control that regulates the
amount of air to the pump drive motor.
1 Hex head capscrew
7 Forward flange
Locator pin
19
13 Rotor vane spring
2 Exhaust elbow
8 Forward flange oil seal
14 Rotor shuttle pin
20
Oil seal
3 Exhaust nipple
9 Ball bearing
21
Ball bearing
15 Rotor stator
16 Socket head capscrew
22
End plate
10 End plate
4 Exhaust elbow
5 Hex head capscrew
11 Rotor assembly
17 Lockwasher
23
Motor housing
18 Rear flange
12 Rotor vane
Housing set screw
6 Lockwasher
24
Figure 4-1. Air motor, disassembly and reassembly.
4-3. Air Motor Cleaning, Inspection and Repair
(2) Inspect the rotor vanes for chips and
excessive wear. If any vane is defective, replace
a. Cleaning.
them all with a rotor vane kit.
(1) Wash all parts with cleaning solvent (Fed
(3) Inspect the rotor and rotor stator for
Spec PD 680) and dry thoroughly.
cracks, scores and rough spots. Remove minor
(2) Discard and replace oil seals.
rough spots with a fine emery cloth. Replace a
b. Inspection and Repair.
defective rotor or stator.
(1) Inspect the rotor bearings for excessive
(4) Inspect the motor housing, forward
wear, rough spots or binding. Replace defective
flange, rear flange, and end plates for cracks,