TM-9-2330-356-14

SEMITRAILER, TANK: 5000 GALLON, BULK HAUL, SELF LOAD/UNLOAD M967 AND M967A1; SEMITRAILER, TANK: 5000 GALLON, FUEL DISPENSING, AUTOMOTIVE M969 AND M969A1; SEMITRAILER, TANK: 5000 GALLON, FUEL DISPENSING, UNDER/OVERWING AIRCRAFT M970 AND M970A1

TECHNICAL MANUAL; OPERATOR’S, UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL

OCTOBER 1990

TM-9-2330-356-14 - Page 409 of 528

TM 9-2330-356-14

Figure 7-59. Piston Ring Installation.

7-74. Oil

Bypass Valve (Fig. 7-60)

a.

Disassembly.

CAUTION

Use care when unscrewing recessed plug in

rear bearing plate. Tension on the bypass

spring may cause it to fly out.

(1) Unscrew recessed plug (1) in rear bearing

plate (4).

(2) Lift out bypass spring (2) and valve plunger

(3).

b.

Cleaning.

WARNING

Dry cleaning solvent P-D-680 is toxic and

flammable. Always wear protective goggles

and gloves, and use Only in a well-ventilated

area. Avoid contact with skin, eyes, and

clothes, and DO NOT breathe vapors. DO

NOT use near open flame or excessive heat.

The solvent’s flash point is 100°F-138°F

(38°C-59°C). If you become dizzy while

using cleaning solvent, immediatety get fresh

air and medical help. If solvent contacts eyes,

immediately wash your eyes with water and

get medical aid.

(1) Clean oil bypass valve (3), spring (2), and plug

(1), using dry cleaning solvent (item 11, Appendix E).

Wipe dry using a clean, lint-free cloth (item 24, Appen-

dix E).

(2) Flush oil port clean using clean diesel fuel

(item 14, Appendix E). Wipe external surfaces dry using a

clean, lint-free cloth (item 24, Appendix E).

WARNING

Particles blown by compressed air can be

dangerous. Be certain to direct air stream

away from the user and other personnel In the

area.

(3) Air dry oil bypass valve port, using clean,

filtered, compressed air under moderate pressure of

approximately 15 psi.

Figure 7-60. Oil Bypass Valve–Disassembled.

(4) Soak all metal parts in a clean container

containing hydraulic fluid (item 18, Appendix E). Wipe

dry using a clean, lint-free cloth (item 24, Appendix E)

and clean filtered air as in step (3) above.

(5)

Coat all components with oil prior to

assembly (para 7-62).

7-53