Oil Pump

TM 5-4130-234-13&P

a. Verify thermocouple gage control for defect and

(5) Close valve (1). Gage (26) must indicate less

inaccuracy before replacement as follow s: (Refer to

than 50 microns.

reference designator M1 and MT1 of fig. 2-1 .1

(6) If gage (26) fails this test, replace entire

(1) Connect service unit to electrical source in

thermocouple gage control (14, figure 5-2) in accordance

accordance with chapter 2, Operating Instruction s.

with section IV.

(2) Connect a certified vacuum gage to union (25,

fig. 2-3) and cap union (24).

5-7.

Cable Assembly (1, fig. 5-2).

(3) Open valves (1, 2), set circuit breaker (22) to

a. If cord (6, fig. 5-3) or connectors (4, 5) required

ON, and set switch (21) to VAC ON.

replacement, strip both ends of wires on cord (6) and

(4) Compare vacuum indication between gage

connect end of black wire to terminal B of each connector.

(26) and certified vacuum gage at 1000, 500, 50, and 20

Connect end of white wire to terminal S of each connector

microns. The minimum accuracy of gage (26) must be 500

and connect end of green wire to terminal G of each

+50 microns.

connector. Secure connectors over outer insulation of cord

(6).

Identification Tie

Connector

Power Cord

Figure 5-3. Power cable assembly

(7) If oil pump (13, fig. 5-2) is defective, replace oil

5-8.

Oil Pump (13, fig. 5-2)

pump.

a. Before replacing oil pump (13), verify pump for

defect as follows:

5-9.

Drain Valve (30, fig. 5-2)

(1) Fill beaker (4, fig. 2-3) with refrigeration oil in

accordance with operating procedure in chapter 2.

a. If drain valve (30) required replacement, hold

(2) Using hose assembly connect suction inlet of

elbow (31) and unthread drain valve.

oil pump to valve (ill.

b. Tape lubricate threads of new: drain valve, hold

(3) Using hose assembly (6, fig. 5-2) with gaskets

elbow (31) and thread new drain valve into fitting to

(3, 4), connect discharge fitting of oil pump to a nitrogen

position drain opening as shown in figure 5-2.

pressurized container of 100 psig.

(4) Open valve (11, fig. 2-3) and hand pump oil

5-10.

Vacuum System Plumbing and Components (8,

from valve (1) into pressurized container. Container

9, 21 thru 57, fig. 5-2)

pressure must not exceed 120 psig. Operate oil pump in a

a. Isolate defective parts by leak checking vacuum

vertical position.

system as follows:

(5) Failure to hand pump 1000 ML of refrigeration

(1) Connect hose assemblies (8, 9) with gaskets

oil into container within five minutes determines a defective

(2, 3) to unions (24, 25, fig. 2-3). Connect other end of

oil pump.

hose assemblies together, using a male union.

(6) Close valve (11). Relieve oil pressure and

(2) Open valves (1, 2), set circuit breaker (22) to

remove hose assemblies.

ON and switch (21) to VAC ON.

(3) Allow vacuum pump to operate for 15

5-8