ELECTRONIC TEST CHAMBER ASSEMBLY, MODEL 453
UNIT MAINTENANCE - CONT
When disassembling the test chamber, use care to prevent scratching the
altitude chamber or lid. Be careful not to damage mating surfaces of altitude
chamber when removing damaged gasket.
1. Remove altitude chamber gasket by carefully pulling gasket from groove in altitude chamber
2. If required, peel off two test chamber identification decals (1) (one located on carrying case
and one on the mounting base (9) and control assembly decal (5)(refer to decals and
instruction plates, WP 0010 00). Retain decals with their serial numbers.
3. Remove vacuum pump/compressor (4) as follows:
a. Disconnect vacuum pump/compressor electrical plug from control assembly vacuum
pump connector (11). Disconnect tubing.
b. Unscrew compression nuts (13, 15) holding tubing to vacuum pump/compressor.
c. From underside of mounting base (9) remove four screws (16) and washers (17) securing
vacuum pump/compressor (4) to mounting base; remove vacuum/compressor.
4. Remove control assembly (3) as follows:
a. Disconnect vacuum pump/compressor electrical plug from vacuum pump/connector (11)
on control assembly.
b. Disconnect altitude chamber electrical connector (12) from control assembly.
c. Unscrew compression nuts holding tubing from ALT CHMBR port, AIR CYL port, AIR
COMP port, and VAC PUMP port.
d. Remove four screws (14) securing control assembly to mounting base; remove control