Table 2-1. Preventive Maintenance Checks and Services (PMCS) - CONT

TM 55-1905-223-24-17

Table 2-1. Preventive Maintenance Checks and Services (PMCS) - CONT

D - Daily

M - Monthly

B - Bimonthly S - Semiannually

A - Annually

Item

Intervals

Items To Be

No.

Inspected/Serviced

Procedures

Compressor on air

WARNING

conditioner No. 2

(accommodations)

Do not open crankcase until system has

been conditioner No. 2 pumped down.

Visually check the oil level by viewing the sight

glass in the compressor crankcase. Shut down the

compressor and allow oil to settle for 5 minutes

before checking. The oil level should be near the

halfway point in the sight glass. Pump system down

(Item 10, Table 4-1). Remove fill plug from crank-

case and add clean compressor oil as required. Re-

place fill plug. To remove excess oil, open crank-

case drain plug only a few turns until oil seeps

from around threads in plug. Do not fully remove

plug. When oil is at proper level, tighten drain

plug to 18 ft-lb. Refer to LO 55-1905-223-12.

NOTE

Oil level cannot be observed in

A/C-1 and 3 (self-contained units).

Open valves and allow refrigerant back into system

All fan motors with V-

Visually check all V-belts for proper tension and

belt drive (SF-4 and 6,

alignment. Check for cracked or deteriorated

EF-4, and 6, A/C-2)

belts. Adjust, secure, or replace V-belt as

required (paras. 2-24, 2-27, and 2-30).

2-12