TM 5-4310-452-14
4-90. UNLOADER VALVE ASSEMBLY REPLACEMENT.
THIS TASK COVERS
a. Removal
b. Installation
INITIAL SETUP
Equipment Conditions:
Materials/Parts:
• Engine off,
• Rag (Item 11, Appendix E)
• Left and right door assemblies open.
• Two gaskets
• Engine and compressor air cleaner filter elements
removed (see paragraph 3-4).
Tools/Test Equipment:
• Engine air cleaner assembly removed (see
• General mechanic's tool kit
paragraph 4-16).
• Compressor air cleaner assembly removed (see
paragraph 4-89).
• Air lines and fittings removed (see para-
graph 4-98).
a. REMOVAL
1.
Remove hose (11) from fittings (8 and 13).
2.
Unscrew fittings (8 and 13) from unloader valve (4).
3.
Remove hose assembly (1) and elbow (2) from unloader valve (4).
4.
Remove 4 nuts (3), unloader valve (4), and gasket (12) from compressor housing (10). Discard gasket.
CAUTION
Ensure that intake hole is covered to prevent dust and debris from entering compressor. Dust
and debris can cause internal damage to the compressor.
5.
Cover intake hole (9) in compressor housing (10) with a rag.
6.
Remove 4 capscrews (7), shaft collar (6), and gasket (5) from unloader valve assembly (4). Discard gasket.
b. INSTALLATION
1.
Install shaft collar (6), new gasket (5), and 4 capscrews (7) on unloader valve (4).
2.
Remove rag from intake hole (9) and position new gasket (12) and unloader valve (4) in place on compressor
housing (10).
3.
Install 4 nuts (3). Tighten nuts to 96 Ib.-ft, (130 Nom.)
4.
Install hose assembly (1) and elbow (2) on unloader valve (4).
5.
Install fittings (8 and 13) in unloader valve (4.). Install hose (11) on fittings.
4-182
