TM 5-2420-231-23-3
0364
A/C SYSTEM PERFORMANCE
0364
1. Refer to Table 2 to determine correct A/C system operation. The pressure chart is based on the following con-
ditions:
a. Fan speed control in maximum position (full clockwise) (TM 5-2420-231-10).
b. All vents open (TM 5-2420-231-10).
c.
Cab temperature control set to maximum cooling (full counterclockwise) (TM 5-2420-231-10).
d. Cab door open.
e. All panels and access doors installed and closed (TM 5-2420-231-10).
f.
Cab filters clean and installed (WP 0347).
g. Heater valve closed (TM 5-2420-231-10).
h. Engine at 1,500 rpm (TM 5-2420-231-10).
i.
No load on engine:
(1) All lights off.
(2) Transmission in neutral.
2. Monitor and record A/C machine gauges for 15 minutes. A/C pressures should be within values in Table 2.
Table 2. Temperature Chart.
0364
AMBIENT
NORMAL LOW-
NORMAL HIGH-
AIR LOUVER (BEHIND
TEMPERATURE
PRESSURE INDICATION
PRESSURE INDICATION
SEAT) MAXIMUM TEMP.
F (C)
PSI (BAR)
PSI (BAR)
F (C)
0364
0364
0364
0364
80F (27C)
9 to 12 psi
145 to 165 psi
55F (14C)
(0.76 to 1.04 bar)
(10 to 11.5 bar)
90F (32C)
11 to 15 psi
190 to 210 psi
61F (18C)
(0.62 to.83 bar)
(13.1 to 14.5 bar)
95F (35C)
16 to 18 psi
210 to 230 psi
63F (20C)
(1.10 to 1.24 bar)
(14.5 to 15.8 bar)
100F (38C)
17 to 19 psi
235 to 255 psi
66F (22C)
(1.17 to 1.31 bar)
(16.2 to 17.6 bar)
105F (41C)
20 to 21 psi
260 to 280 psi
68F (23C)
(1.38 to 1.45 bar)
(17.9 to 19.3 bar)
110F (43C)
22 to 24 psi
290 to 310 psi
72F (25C)
(1.93 to 2.14 bar)
(20 to 21.4 bar)
END OF TASK
FOLLOW-ON TASKS
0364
Disengage and stow safety support strut, and lower front end loader (TM 5-2420-231-10).
END OF TASK
END OF WORK PACKAGE
