TM 5-4310-275-14
Table 5-1. Troubleshooting (Cont'd )
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE
ACTION
1. INSUFFICIENT AIR FLOW, LOW OUTLET PRESSURE, OR EXCESSIVE PUMPUP TIMEContinued
WARNING
Dry cleaning solvent P-D-680 used to clean parts is potentially dangerous to personnel and
property. Avoid repeated and prolonged skin contact. Do not use near open flame or excessive
heat. Flash point of solvent is 100F.-138F. (39C.--59C.).
b. Cleaning. Clean the dump valve with dry cleaning solvent, Fed Spat P. D-680.
c. Installation.
(1) Screw the dump valve onto the separator assembly,
(2) Install the separator and filter assembly.
(3) Install the pressure relief, check valve, and back pressure valve.
Step 4. Inspect for ruptured discs in second or third stage cylinders, filter and separator, or safety fitting leaking or
blown out.
Install new rupture disc(s).
a. Removal.
(1) Unscrew the disc holddown screw.
(2) Remove the disc retainer ring from the cylinder cap.
(3) Remove the defective disc.
b. Installation.
(1) Install the disc retainer ring in the cylinder cap.
(2) Screw the disc holddown screw into place.
Step 5. Inspect for a partially closed shut-off valve to receiver.
Open valve.
Step 6. Check for a clogged line filter element.
Replace the element.
Step 7. Inspect for restricted air inlet to compressor first stage cylinder.
Remove the restriction.
Step 8. Check compressor for not operating at rated speed.
Engine governor not properly adjusted or engine operating erratically. See TM 5-2805-257-14.
2. EXCESSIVE OIL CONSUMPTION (Air Compressor)
Step 1. Inspect for oil leaks.
Repair or replace parts as necessary.
Step 2. Inspect for excessive piston-to-cylinder-wall clearance.
Upon disassembly of the air compressor, inspect the clearance (see table 5-2) and replace as necessary.
3. AIR COMPRESSOR OVERHEATS
Step 1. Check for low oil supply.
Replenish the oil supply.
Step 2. Inspect for insufficient or obstructed flow of cooling air.
Position the cart to provide adequate flow of air through louvers. Open access doors.
Step 3. Check for clogged fins on cylinders or tubing.
Clean thoroughly.
4. EXCESSIVE MOISTURE OR OIL VAPOR IN HIGH PRESSURE AIR
Step 1. Inspect the desiccant container.
If the desiccant color has faded from the characteristic blue then discard. Unscrew the cap and lift out the
desiccant container.
Step 2. Check for partially full or defective filter and separator assembly.
Press push valve to blow down condensate. Disassemble, clean, and replace parts in filter separator assembly.
a. Disassemble.
(1) Unscrew the pneumatic dump valve from the bottom of the separator shell.
(2) Unscrew the tank cap from the top of the separator shell.
(3) Remove screw and washer and then lift the filter element and gasket from the cap.
b. Assemble.
(1) Place the filter element and gasket in the cap and install the screw and washer,
(2) Replace the tank cap on top of the separator shell.
(3) Install the pneumatic dump valve on the bottom of the separator shell.
