TM-9-2320-361-34
2-1/2-TON, 6x6, M44A2 SERIES TRUCKS (MULTIFUEL)
TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE
MAY 1992
TM-9-2320-361-34 - Page 93 of 764
TM 9-2320-361-34
3-13. OIL PRESSURE REGULATOR HOUSING MAINTENANCE (Contd)
b.
Disassembly
I
1. Remove oil pressure regulator valve plug (6) and gasket (5) from regulator valve housing (1) Discard
gasket (5).
2. Remove oil pressure regulator spring (4) and plunger (3) from regulator valve housing (1).
3. Remove piston oil cooling control valve plug (7) and gasket (8) from regulator valve housing (1).
Discard gasket (8).
4. Remove piston oil cooling control valve spring (9) and plunger (3) from regulator valve housing (1).
5. Remove plug (10) from regulator valve housing (1).
c. Cleaning and Inspection
1. For general cleaning instructions, refer to para. 2-9.
2. For general inspection instructions, refer to para. 2-10.
3. Inspect bores (2) for burrs, scratches, or wear. Refer to table 3-3, Oil Pressure Regulator Wear
Limits, for measurements. Remove burrs and scratches with crocus cloth. Replace if excessively
burred, scratched, or worn.
4. Inspect oil pressure regulator spring (4) for distortion, cracks, and collapsed coils. Refer to
table 3-3, Oil Pressure Regulator Wear Limits, for measurements. Replace oil pressure regulator
spring (4) if distorted, cracked, coils are collapsed, or worn.
5. Using spring tester, compress oil pressure regulator spring (4) to 3.44 in. (87.38 mm). Load
measured should be 24.6 -28.6 lb (11.17 -13.0 kg), Replace oil pressure regulator spring (4) if not
within limits.
6. Inspect piston cooling relief valve spring (9) for distortion, cracks, collapsed coils, or wear. Refer to
table 3-3, Oil Pressure Regulator Wear Limits, for measurements. Replace piston cooling relief
valve spring (9) if distorted, cracked, coils are collapsed, or worn.
7. Using spring tester, compress piston cooling relief valve spring (9) to 1.38 in. (35.05 mm), Load
measured should be 6.95-8.35 lb (3.16-3.79 kg). Replace piston cooling relief valve spring (9) if not
within limits.
8. Inspect two plungers (3) for nicks, burrs, or scratches. Refer to table 3-3, Oil Pressure Regulator
Wear Limits, for measurements. Replace plungers (3) if nicked, burred, scratched, or worn.
Table 3-3. Oil Pressure Regulator Wear Limits.
Item
Item/Point of Measurement
Wear Limits/Tolerance
No.
Inches
Millimeters
2
Inside Diameter of Plunger
Bores in Housing
0.803-0.804
20.40-20.42
3,10
Outside Diameter of Plunger
0.8000-0.801
2.032-20.35
4
Piston Cooling Relief Valve Spring
Free Length
1.6200
41.14
9
Oil Pressure Regulator Spring
Free Length
4.650
118.11
3-42
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